{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1894 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"141"},{"label":"placed","value":"134"},{"label":"unplaced","value":"7"},{"label":"fit sources","value":"georef 70, georef-snap 59, georef-street 4, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"4 sheet(s) cut into 8 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 41.94909,-87.68417 +/-127m); p16 (tier 1, 41.92748,-87.63991 +/-257m); p17__1 (tier 1, 41.93218,-87.67923 +/-100m); p17__2 (tier 1, 41.93165,-87.67926 +/-131m); p19__1 (tier 1, 41.93014,-87.67497 +/-100m); p52__1 (tier 1, 41.93479,-87.64005 +/-259m); p52__2 (tier 2, 41.93708,-87.64364 +/-1491m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0010","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.1,2018.2 110.9,49.7 643.0,55.8 1082.8,58.4 1075.2,554.4 1031.2,554.2 1034.4,999.8 1365.0,1335.6 1233.0,1469.7 985.4,2030.3 1080.7,2031.3 1080.5,2049.7 109.1,2018.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[107.0,2008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65360695254901,41.92539945105282]}},{"type":"Feature","properties":{"resourceCoords":[107.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65375077235636,41.92902471685768]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p100","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0100","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1185.3,36.5 1172.8,1550.5 1181.6,2038.3 1139.3,2038.2 931.1,2037.8 202.0,2036.0 202.0,550.1 306.9,550.1 498.3,448.0 498.4,394.9 297.7,39.1 1185.3,36.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[202.0,1042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6567033,41.945355]}},{"type":"Feature","properties":{"resourceCoords":[202.0,2036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6566487,41.9435252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p101","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0101","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"46.0,1544.4 69.3,39.1 1085.3,47.4 1283.4,49.0 1289.1,1045.0 1280.6,1556.3 1316.1,1556.8 1257.7,2042.2 624.7,2035.4 51.3,2029.5 46.0,1544.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[307.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6535876,41.9435702]}},{"type":"Feature","properties":{"resourceCoords":[548.0,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6531334,41.947265]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p102","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0102","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.0,2024.2 127.8,1540.3 92.4,1540.0 99.0,1030.4 90.4,37.9 100.1,37.9 328.0,39.0 769.0,41.1 862.6,52.5 1191.2,58.8 1293.3,59.5 1253.7,556.5 1257.7,556.6 1250.3,1066.6 1257.2,1066.7 1249.8,2031.2 1030.8,2030.5 806.9,2029.7 568.1,2028.0 71.0,2024.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[812.0,1051.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6494341,41.945447]}},{"type":"Feature","properties":{"resourceCoords":[328.0,39.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6507092,41.9473034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p103","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0103","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1379.0,1874.2 1379.0,2020.0 1284.0,2021.0 965.8,2024.7 546.5,2029.6 503.0,2030.0 124.6,2034.3 117.4,1051.8 110.4,1051.8 110.2,532.3 106.0,532.3 138.9,25.5 235.5,24.8 522.0,21.4 555.9,6.5 795.4,552.0 1006.2,1026.2 1167.1,1389.6 1337.1,1778.5 1379.0,1874.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[267.0,1051.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6479543,41.9454441]}},{"type":"Feature","properties":{"resourceCoords":[503.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6473484,41.943663]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p104","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0104","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"969.0,1951.5 550.0,1949.4 157.6,1949.2 166.0,274.5 128.6,273.0 72.8,33.4 664.8,16.2 1083.8,47.3 1108.7,115.3 1248.9,107.1 1379.0,179.0 1379.0,335.8 1021.7,1700.6 969.0,1951.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0104/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64193052595714,41.947276593902735]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64050593624613,41.94495704536878]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64517800328326,41.94334718770517]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64660259299427,41.945666736239126]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p105","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0105","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"63.8,2059.2 29.6,1963.3 81.8,1028.7 39.5,369.6 101.0,115.5 206.5,100.0 206.0,50.0 699.7,49.0 1188.7,51.9 1185.9,1038.5 1173.8,1038.4 1103.2,2022.2 730.1,2019.3 206.0,2017.0 205.5,2057.4 63.8,2059.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[206.0,2017.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6882453,41.9467436]}},{"type":"Feature","properties":{"resourceCoords":[206.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6883652,41.9503726]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p106","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0106","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"187.8,1033.7 199.9,1033.6 196.0,51.0 1167.7,50.0 1170.8,1032.0 1221.5,1032.0 1224.0,2015.0 1214.5,2015.0 643.5,2014.5 241.1,2014.2 156.2,2014.1 124.1,2014.0 187.8,1033.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1174.0,2015.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6834043,41.9468075]}},{"type":"Feature","properties":{"resourceCoords":[196.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859274,41.9504136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p107","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0107","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"703.1,2039.2 656.5,2039.1 259.2,2038.1 258.3,1042.0 207.0,1042.0 205.4,47.0 247.8,47.0 652.4,47.3 1190.2,47.6 1193.8,2040.5 703.1,2039.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,1042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6834558,41.9486284]}},{"type":"Feature","properties":{"resourceCoords":[1192.0,1042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6810345,41.9486634]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p108","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0108","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1192.2,48.8 1192.4,90.1 1192.5,134.3 1198.7,1762.2 1201.2,2014.0 1152.8,2013.5 754.3,2014.4 226.4,2014.9 216.0,51.6 1192.2,48.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[224.0,2026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6809878831947,41.94681739514493]}},{"type":"Feature","properties":{"resourceCoords":[224.0,58.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.681066132285,41.95046971709461]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0109","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1028.2,2029.5 49.1,2018.3 49.7,1764.0 64.0,120.8 64.2,100.1 1043.8,60.6 1038.4,48.6 1239.4,49.8 1242.0,49.8 1286.2,568.2 1379.0,760.6 1379.0,967.1 1379.0,1035.0 1303.6,1034.4 1270.5,1533.7 1272.5,1533.7 1321.4,2033.0 1069.7,2030.0 1028.2,2029.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0109/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1037.0,1040.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67617740342094,41.948718167811265]}},{"type":"Feature","properties":{"resourceCoords":[1037.0,2026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67610816969683,41.94690599858034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0011","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"295.0,2019.8 199.7,2019.6 443.1,1456.6 574.1,1321.4 240.7,987.9 234.0,542.0 278.0,541.9 281.8,45.5 292.5,45.4 779.9,43.2 1263.6,46.0 1262.0,183.1 1270.9,1819.1 1271.3,2017.6 1297.8,2044.3 866.9,2052.3 295.0,2038.2 295.0,2019.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1273.0,540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64884180362694,41.92818003567569]}},{"type":"Feature","properties":{"resourceCoords":[1273.0,2003.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64876302906792,41.92547969496514]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p110","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0110","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"131.9,2022.3 83.4,1525.9 81.4,1525.8 114.5,1029.4 189.4,1030.0 189.5,757.1 97.2,565.8 53.5,50.2 352.1,52.1 1341.8,62.1 1322.8,1980.1 1306.8,2035.9 807.4,2031.2 476.9,2026.4 131.9,2022.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0110/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[862.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6735899,41.9469289]}},{"type":"Feature","properties":{"resourceCoords":[-149.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6762436,41.9505403]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p111","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0111","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"120.9,1970.8 118.5,61.0 1059.5,61.0 1102.4,61.0 1295.2,61.0 1308.7,1040.3 1302.2,1040.3 1311.8,2020.1 1111.5,2021.2 582.0,2024.0 105.5,2026.5 120.9,1970.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[582.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6713811,41.9506101]}},{"type":"Feature","properties":{"resourceCoords":[582.0,2024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.671295,41.9469656]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p112","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0112","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"773.3,2010.0 574.4,2010.1 82.8,2010.5 82.3,2010.5 75.6,1022.6 82.1,1022.6 71.5,35.1 75.9,35.1 953.9,38.5 1267.8,39.8 1311.3,40.0 1313.6,1024.3 1307.3,2009.7 773.3,2010.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0112/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[822.0,2010.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.667642,41.9470256]}},{"type":"Feature","properties":{"resourceCoords":[822.0,38.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6677425,41.9506566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p113","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0113","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.2,2061.6 557.3,2059.3 1090.3,2056.9 1290.2,2055.9 1246.7,1079.1 1251.8,1079.1 1286.6,1.0 1036.3,1.0 1036.6,56.7 1036.9,106.5 829.6,108.9 67.3,108.7 73.5,1084.6 71.2,2061.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,2036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66523580066303,41.94710699129441]}},{"type":"Feature","properties":{"resourceCoords":[554.0,92.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6653163740257,41.95071741476949]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p114","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0114","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"809.6,1.0 99.3,1.0 62.4,1096.7 57.4,1096.7 99.2,2056.4 102.5,2056.4 335.2,2055.7 767.0,2054.3 1290.4,2052.7 1324.7,2052.6 1334.5,1091.0 1308.7,1091.1 1329.9,1.0 1285.6,1.0 1285.8,44.1 1286.0,57.5 1286.2,110.8 1203.0,112.4 809.8,63.5 809.7,45.3 809.6,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0114/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66373998182705,41.95097662264086]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66025705485119,41.95102332105823]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66016298953903,41.94708763627241]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6636459165149,41.947040937855036]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p115","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0115","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1103.8,2077.5 1232.6,2078.3 1276.3,1520.8 1272.7,1514.2 1265.5,1108.9 1226.2,1108.4 1237.7,52.9 1237.8,38.9 474.9,79.8 431.2,1.0 114.2,1.0 80.5,1100.0 106.4,1100.2 85.6,2070.7 94.2,2070.7 535.2,2074.1 1103.8,2077.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0115/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[538.0,1106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6592356796602,41.94897202839085]}},{"type":"Feature","properties":{"resourceCoords":[538.0,17.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65931540145351,41.951010756298814]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p116","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0116","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.3,2081.0 464.9,2075.6 1338.1,2059.0 1336.9,1810.3 1305.5,35.9 1304.9,1.0 347.4,1.0 328.1,1.3 290.6,1.8 67.2,4.8 67.8,54.9 80.6,1111.3 120.0,1110.9 136.4,1516.3 140.2,1522.8 109.3,2081.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-77.0,1102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65789981811024,41.949020648439074]}},{"type":"Feature","properties":{"resourceCoords":[1322.0,1102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65438006461781,41.94903663581063]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p117","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0117","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"57.7,39.3 62.0,1810.5 59.4,2058.6 1062.7,2058.7 1268.0,2058.7 1291.5,2058.7 1349.7,1098.4 1334.3,1098.5 1283.2,568.0 1315.0,568.0 1264.4,1.0 57.6,1.0 57.7,39.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[537.0,1100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65317270688409,41.94906221477191]}},{"type":"Feature","properties":{"resourceCoords":[66.0,11.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65441849220005,41.95108467442046]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p118","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0118","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"281.7,2057.6 718.3,2053.6 811.0,2063.5 1136.4,2065.2 1285.6,2064.2 1149.0,1086.8 1222.5,1072.1 1255.2,1057.9 768.0,1.0 33.1,1.0 89.3,570.5 57.5,570.8 113.4,1100.1 128.8,1099.9 79.6,2059.4 281.7,2057.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0118/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[754.0,16.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64957969552648,41.95114667109502]}},{"type":"Feature","properties":{"resourceCoords":[754.0,2041.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6495177229663,41.947345301419865]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p119","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0119","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1241.3,1752.5 1131.2,2012.0 1112.9,2054.4 151.1,1784.4 167.2,1710.3 167.3,1674.2 170.0,964.0 160.9,33.5 230.1,34.3 241.1,54.4 442.3,121.4 544.6,71.9 589.2,132.0 827.0,135.8 1005.6,40.9 1139.3,45.5 1141.8,33.3 1243.7,34.2 1240.7,234.1 1241.3,1716.1 1241.3,1752.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0119/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[170.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6466664,41.9497403]}},{"type":"Feature","properties":{"resourceCoords":[1241.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6455662,41.9479306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0012","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.3,2026.8 213.0,2000.0 214.1,1801.6 217.2,166.5 219.8,29.5 754.6,41.8 1201.6,44.3 1194.6,723.8 1198.1,1685.0 1191.9,2007.6 1379.0,2009.2 1379.0,2014.1 239.3,2026.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[712.0,41.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6476693,41.9290966]}},{"type":"Feature","properties":{"resourceCoords":[213.0,2000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6487665,41.9254527]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p120","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0120","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.8,423.2 112.8,225.3 11.9,224.5 42.0,77.3 114.6,39.0 1095.3,7.0 1152.5,242.1 1189.4,243.5 1196.0,1888.2 690.5,1890.7 110.2,1890.7 109.8,423.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[110.0,1146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6455662,41.9479306]}},{"type":"Feature","properties":{"resourceCoords":[1193.0,1146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6444422,41.9460825]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p121","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0121","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"99.1,2057.6 42.4,1990.8 113.0,1766.6 55.7,1721.6 62.8,1408.5 156.1,1148.4 49.0,410.3 136.4,84.5 232.6,21.1 1180.8,35.0 1179.0,2007.0 691.8,2005.1 200.0,2007.0 200.6,2056.8 95.6,2072.5 99.1,2057.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,2007.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6883652,41.9503726]}},{"type":"Feature","properties":{"resourceCoords":[1179.0,2007.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859274,41.9504136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p122","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0122/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0122","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1224.1,2005.0 1182.0,2005.0 204.0,2005.0 198.3,20.5 1090.5,30.2 1177.4,13.2 1179.8,1015.2 1190.0,1015.2 1266.9,2005.0 1224.1,2005.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[204.0,2005.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859274,41.9504136]}},{"type":"Feature","properties":{"resourceCoords":[1182.0,2005.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6835073,41.9504475]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p123","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0123/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0123","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"322.4,13.2 1379.0,15.9 1175.5,16.4 1175.4,70.2 1180.0,2013.0 649.7,2013.0 293.3,2013.0 216.9,1030.7 206.8,1030.7 204.3,36.1 322.4,13.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[209.0,2013.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6835073,41.9504475]}},{"type":"Feature","properties":{"resourceCoords":[1180.0,2013.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6810864,41.9504813]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p124","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0124","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"195.4,2015.8 1183.2,2023.3 1190.2,992.5 1188.3,56.9 1209.0,56.9 1187.9,6.2 651.8,1.0 206.3,1.0 205.8,51.5 195.4,2015.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[198.0,2014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68108011730482,41.950484771631565]}},{"type":"Feature","properties":{"resourceCoords":[2238.0,2014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6760505665248,41.95058366555977]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p125","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0125","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1209.7,25.4 1209.2,75.8 1327.0,77.2 1291.5,552.7 1299.8,552.9 1292.9,1024.0 1315.2,1024.2 1290.5,1519.4 1278.4,1519.3 1329.5,2004.2 1209.5,2003.1 1012.1,2001.3 1017.4,2013.1 55.1,2048.8 55.4,2025.3 55.9,1984.3 68.0,974.3 71.0,57.5 91.2,57.6 70.8,7.8 1209.7,25.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.0,1016.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6774896,41.9523563]}},{"type":"Feature","properties":{"resourceCoords":[776.0,1512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6768765,41.9514418]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p126","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0126","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"320.2,2014.0 1310.2,2017.4 1316.5,66.5 1299.7,37.2 628.8,15.2 1.0,11.5 1.0,62.5 119.3,62.7 88.0,544.6 96.3,544.6 93.9,1021.8 116.6,1021.8 96.2,1523.5 84.1,1523.5 140.5,2014.0 320.2,2014.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0126/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6759044,41.95427]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6724751,41.9543262]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67236100000001,41.950478499999996]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6757903,41.9504223]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p127","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0127","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"230.2,50.1 271.1,66.0 1332.8,14.7 1356.7,24.4 1292.3,53.8 1176.1,54.9 1179.1,298.0 1181.8,1021.8 1177.4,2015.4 226.7,2012.5 230.2,50.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[695.0,1022.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714316,41.9524327]}},{"type":"Feature","properties":{"resourceCoords":[695.0,2014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6713811,41.9506101]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p128","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0128","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"725.6,14.8 1288.8,69.5 1310.0,1033.1 1313.3,1033.1 1283.5,2023.4 1259.4,2023.3 386.8,2020.4 189.2,2019.9 146.2,2019.8 150.1,1034.3 147.0,316.6 143.9,75.5 259.1,74.4 323.0,45.1 299.2,35.5 725.6,14.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[644.0,1034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6689985,41.9524706]}},{"type":"Feature","properties":{"resourceCoords":[644.0,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6689491,41.950642]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p129","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0129/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0129","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1335.3,1870.8 1330.9,323.3 1332.0,42.9 1332.1,1.0 1292.7,1.0 1264.8,24.4 33.9,57.9 55.3,1024.5 58.5,1024.5 28.7,2017.8 317.4,2018.8 360.9,2019.0 1127.2,2021.8 1335.7,2020.1 1335.5,1970.0 1335.3,1870.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0129/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6675275,41.9543873]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6641001,41.9544383]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6639967,41.9505927]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6674241,41.9505417]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0013","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"205.8,73.5 204.2,754.7 215.4,1718.1 211.8,2041.5 399.4,2041.7 400.4,2046.5 1180.2,2031.4 1173.0,1995.2 1166.0,1062.5 1104.0,700.8 1103.7,689.1 1122.8,674.0 1235.9,644.4 1207.8,73.8 1224.4,76.8 1193.0,1.0 1045.4,1.0 1003.9,1.3 915.9,21.7 893.0,27.0 754.5,47.7 570.2,66.2 381.5,73.2 205.8,73.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[208.0,2023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64634694198209,41.925525142811516]}},{"type":"Feature","properties":{"resourceCoords":[208.0,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64644889638106,41.929134395987504]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p130","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0130","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"88.8,1997.7 88.7,1955.3 87.7,402.1 89.3,120.7 89.6,77.5 51.2,77.5 81.8,51.9 755.1,96.2 895.4,48.0 1289.7,115.3 1327.0,715.5 1252.4,768.8 1237.8,742.6 1183.3,1116.6 1069.2,1116.5 1067.3,1958.0 1067.2,1964.5 456.2,1962.0 342.8,1961.5 341.4,1999.0 88.8,1997.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[88.0,1121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6641658277861,41.95251633470194]}},{"type":"Feature","properties":{"resourceCoords":[88.0,1962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66411973704952,41.95096871022961]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p131","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0131","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1311.0,1531.5 1259.0,1530.8 1259.8,1485.7 1268.0,1486.0 1270.7,1166.4 1351.8,1122.5 1316.8,351.6 1280.4,350.9 1284.5,125.5 1285.2,88.3 1.0,154.4 1.0,177.9 37.5,178.1 61.5,703.1 30.0,1735.5 20.9,1735.8 72.7,1810.7 46.5,1824.7 416.9,1884.5 414.9,1997.8 1250.2,2012.5 1302.8,2013.5 1321.3,2013.8 1379.0,1616.8 1379.0,1532.5 1324.6,1531.7 1311.0,1531.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0131/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[418.0,1625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6608091,41.952585]}},{"type":"Feature","properties":{"resourceCoords":[1268.0,1034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6592571,41.951051]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p132","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0132","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.2,1943.5 206.7,1943.7 203.3,1943.7 202.6,1943.7 107.2,654.4 83.7,654.9 76.8,224.6 152.1,72.2 255.0,37.2 1177.0,59.5 1193.3,1939.5 1193.4,1951.3 707.1,1946.9 286.3,1943.4 239.2,1943.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0132/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1199.0,1953.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65442625718664,41.9510954502929]}},{"type":"Feature","properties":{"resourceCoords":[1199.0,1098.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65445825495024,41.952673390825055]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0133/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p133","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0133/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0133","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"192.1,1938.2 192.2,1930.0 224.1,58.2 1379.0,115.9 1379.0,126.3 1379.0,135.1 1360.1,134.7 1194.0,131.2 1179.0,1110.0 1221.7,1111.2 1198.7,1951.6 1164.6,1957.1 581.8,1945.8 192.1,1938.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0133/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[658.0,1952.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65327862592258,41.95111469306443]}},{"type":"Feature","properties":{"resourceCoords":[213.0,608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65452341051115,41.953570329891335]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0134/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p134","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0134/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0134","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"395.0,100.9 396.4,120.1 806.4,120.7 854.9,120.5 1072.8,122.5 1163.7,792.0 1186.4,839.4 1188.2,1275.3 1182.2,1949.2 1182.3,1956.3 461.3,1948.5 461.6,1952.3 212.9,1951.9 247.1,1945.8 255.1,1102.2 212.2,1101.8 209.7,119.5 376.4,120.1 395.0,100.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0134/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6526563,41.9547395]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6492293,41.9547978]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.649111,41.9509526]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.652538,41.9508943]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0135/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p135","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0135/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0135","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"321.1,1952.8 382.9,1933.1 1087.8,1709.8 1160.7,1688.6 1084.8,1068.8 1143.0,1065.8 1214.4,125.5 1302.7,92.7 1034.5,46.7 1.0,91.0 1.0,92.5 10.7,106.9 230.2,111.2 314.7,786.8 337.0,834.7 334.2,1273.9 321.1,1952.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0135/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1038.0,1094.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64791379225436,41.9528071898143]}},{"type":"Feature","properties":{"resourceCoords":[1038.0,1747.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6478599809329,41.95161054563959]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0136/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p136","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0136/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0136","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"184.9,1812.1 130.1,1184.7 188.8,1183.7 293.7,238.3 383.9,208.3 489.1,230.1 783.0,64.2 950.0,231.8 1157.3,245.9 1159.5,759.3 1293.0,872.6 1360.3,1412.7 1333.5,1697.6 1230.7,1715.4 1236.4,1545.4 326.5,1776.2 184.9,1812.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0136/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[74.0,1176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6479387173622,41.952865025452624]}},{"type":"Feature","properties":{"resourceCoords":[74.0,1850.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64782660821679,41.95164265617066]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0137/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p137","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0137/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0137","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"169.4,990.4 274.1,71.5 428.7,136.0 448.1,35.1 451.1,36.5 1270.4,179.0 1346.6,319.3 1277.1,318.2 1281.4,1253.2 1275.0,1966.9 74.9,1984.0 78.8,1940.0 144.6,1208.2 169.4,990.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0137/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[142.0,1237.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6478078236172,41.95166407259769]}},{"type":"Feature","properties":{"resourceCoords":[1274.0,1237.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64663736573083,41.94976522064355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p14 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5520.0"},{"label":"split_canvas_h","value":"8328.0"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.4,1069.8 49.1,1998.3 55.7,2034.5 1329.3,2029.5 1339.2,1760.0 1261.0,1501.9 1265.2,583.2 899.1,620.9 842.6,370.9 858.5,363.7 855.3,355.1 847.5,333.8 846.5,331.1 825.5,339.6 769.9,362.0 755.9,327.1 681.4,141.2 682.9,197.1 113.0,86.2 132.3,654.6 19.3,682.4 1.0,686.9 1.0,714.1 56.4,1069.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1058.0,1089.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64153246316683,41.92736363985233]}},{"type":"Feature","properties":{"resourceCoords":[1168.0,1389.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64123185235803,41.926816111105595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p14 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2897.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2622.8"},{"label":"split_canvas_h","value":"2315.6"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1379.0,393.7 1379.0,337.7 1266.8,37.1 1242.5,2.5 1201.1,26.9 1157.4,42.7 915.2,122.0 780.7,152.8 824.2,270.8 1379.0,393.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0014__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[724.3,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6442193525174,41.929637952721016]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64260462923848,41.92971448559728]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,578.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64251447099731,41.92864668499946]}},{"type":"Feature","properties":{"resourceCoords":[724.3,578.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64412919427623,41.92857015212319]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p15","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0015","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"454.2,1825.4 294.3,1903.0 292.3,1467.7 288.0,1025.0 286.4,533.5 282.0,70.6 429.0,130.8 489.8,35.5 866.8,254.8 983.1,265.3 1024.5,170.5 1208.2,395.8 1129.8,796.7 1173.2,1692.8 1137.9,1692.0 1138.1,1715.0 1138.6,1775.7 1100.5,1775.9 573.5,1779.1 532.2,1790.1 541.2,1859.6 454.2,1825.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[288.0,1025.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6414608,41.9306619]}},{"type":"Feature","properties":{"resourceCoords":[1132.0,1025.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6406316,41.9292488]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0018","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"249.3,512.3 1.0,514.8 1.0,520.9 49.8,520.4 106.7,1975.7 623.9,1964.2 889.2,2058.3 1298.7,2046.2 1327.8,1989.3 1379.0,2046.8 1379.0,2003.9 1308.8,1919.7 1328.1,500.1 1379.0,499.5 1379.0,1.0 417.6,1.0 418.0,25.2 422.8,273.1 249.3,512.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0018/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67840914551718,41.93324956165436]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67492516767962,41.93326348254922]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67489713461187,41.92932548729653]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67838111244943,41.929311566401665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0019__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p19 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.75"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5520.0"},{"label":"split_canvas_h","value":"8328.0"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0019__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0019","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.7,1603.7 134.5,1649.3 171.8,1650.1 449.9,1987.2 499.7,2046.6 558.0,2035.3 679.8,2031.2 1304.3,2023.8 1348.2,2023.2 1335.2,702.7 1333.9,702.8 1328.2,35.6 1299.5,35.9 564.4,41.2 457.3,42.0 457.5,1.0 141.2,1.0 141.1,44.4 87.7,44.8 61.7,1516.1 133.7,1603.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0019__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[471.0,2019.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67406378916641,41.92872115385177]}},{"type":"Feature","properties":{"resourceCoords":[-1109.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67798437550623,41.932276146439456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.40"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0002","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"305.9,53.5 258.6,1.0 184.4,1.0 187.3,90.2 55.9,94.4 118.6,457.6 41.1,1007.8 110.0,1107.8 75.3,1393.8 148.6,1632.5 150.8,1931.8 263.3,2023.2 1292.5,1997.8 1324.5,2004.5 1065.5,854.3 994.3,790.4 1350.6,388.1 1287.1,325.3 1271.0,293.7 1265.0,48.8 1213.8,51.5 1150.4,54.9 534.5,87.6 414.6,96.6 357.5,110.1 305.9,53.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[417.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67384201821478,41.92873623381097]}},{"type":"Feature","properties":{"resourceCoords":[1002.0,817.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67244835139952,41.927327703200106]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0020","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"48.3,2007.2 28.2,2007.2 31.2,715.0 29.9,715.0 32.3,62.3 465.6,64.4 1239.0,68.4 1245.8,68.5 1259.5,2007.9 1246.9,2007.9 1005.8,2007.8 99.4,2007.2 48.3,2007.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67209065299818,41.93246980889548]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66865623352909,41.932525615666336]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66854385384038,41.92864361430089]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67197827330946,41.92858780753003]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0021","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1293.3,2026.0 889.4,2030.4 288.0,2037.1 122.8,2038.9 86.6,62.0 133.8,61.8 304.0,60.2 354.8,59.6 1309.7,48.7 1316.9,601.0 1259.0,601.0 1316.7,2025.7 1293.3,2026.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[330.0,2033.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66833842680737,41.928791601934314]}},{"type":"Feature","properties":{"resourceCoords":[330.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66838818940451,41.93239896874136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0022","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.7,54.6 641.6,55.8 1184.1,57.8 1179.3,2016.7 194.2,2012.4 175.7,2012.3 139.4,600.3 197.1,601.2 198.2,54.0 238.7,54.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66647127171275,41.932530194121654]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6630709436888,41.93259499857843]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66294044801582,41.92875144574407]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66634077603977,41.92868664128729]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p23","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0023","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1142.8,2027.5 950.5,2027.2 211.0,2026.0 211.0,53.0 1191.7,54.3 1181.2,1902.5 1181.6,2027.2 1142.8,2027.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[211.0,2026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6634389,41.9288626]}},{"type":"Feature","properties":{"resourceCoords":[211.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6635501,41.932479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0024","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"183.1,1889.6 204.5,43.0 1186.2,49.9 1179.7,2022.0 182.8,2014.3 183.1,1889.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1191.0,2020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65856136344581,41.928943701756346]}},{"type":"Feature","properties":{"resourceCoords":[1191.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65870105938994,41.932555159391654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p25","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0025","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.4,2013.3 120.4,39.7 320.5,39.5 1104.0,44.0 1285.2,45.1 1286.3,874.7 1149.6,1016.6 1110.5,1039.2 1106.4,1102.8 1104.0,2019.0 117.4,2013.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1104.0,2019.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6561581,41.9289779]}},{"type":"Feature","properties":{"resourceCoords":[1104.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6562896,41.9325977]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p26","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0026","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"208.9,1107.3 213.1,1043.9 252.2,1021.5 388.9,880.4 390.0,53.0 1191.5,59.8 1182.4,2029.2 204.0,2021.0 208.9,1107.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[204.0,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6561581,41.9289779]}},{"type":"Feature","properties":{"resourceCoords":[390.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6558432,41.9326047]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p27","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0027","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"779.6,2027.8 244.0,2024.0 244.0,51.0 1230.4,50.5 1233.2,2028.5 779.6,2027.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[244.0,2024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6537407,41.9290162]}},{"type":"Feature","properties":{"resourceCoords":[244.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.653863,41.932636]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0028","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"204.1,39.0 1188.3,49.9 1180.8,691.2 1175.3,967.6 1171.8,1446.7 1164.7,2040.1 676.3,2030.0 184.1,2024.8 204.1,39.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1178.0,54.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64903795163477,41.93272030133772]}},{"type":"Feature","properties":{"resourceCoords":[1178.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64885997834014,41.92911078775155]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p29","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0029","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"726.8,2026.7 189.8,2015.7 190.8,1426.0 189.4,950.0 192.1,675.2 193.0,38.0 1038.3,38.7 1127.3,38.9 1284.5,38.9 1299.4,38.9 1276.7,676.9 1176.2,677.8 1178.6,1352.7 1175.6,2028.0 726.8,2026.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[684.0,2026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6476693,41.9290966]}},{"type":"Feature","properties":{"resourceCoords":[193.0,38.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6490131,41.9327285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0003","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.9,842.8 27.8,776.0 399.9,391.2 339.4,326.0 324.8,293.8 329.5,49.8 1234.3,41.4 1246.8,1133.1 1291.4,1996.7 1203.0,1994.6 482.2,2044.2 303.5,1998.7 95.9,842.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[27.0,793.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.672466849437,41.927345897788655]}},{"type":"Feature","properties":{"resourceCoords":[1309.0,1991.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66923473378088,41.92515215669013]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0030","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"700.5,1986.2 561.9,2004.7 377.6,2020.3 189.0,2024.3 13.6,2021.8 23.6,1348.7 28.1,675.8 128.3,676.0 157.6,40.2 319.6,42.0 710.9,46.4 735.4,241.1 773.9,409.8 824.4,570.0 936.2,848.5 1111.8,1295.6 1197.8,1521.4 1249.5,1583.2 1379.0,1702.4 1379.0,1795.0 1117.4,1889.8 984.3,1924.3 1000.1,1964.0 811.6,1962.3 700.5,1986.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[32.0,2078.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64640316608855,41.929014447399524]}},{"type":"Feature","properties":{"resourceCoords":[680.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64498265697989,41.93280548255015]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0031","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1314.0,553.6 1149.1,1098.4 1153.5,1780.0 715.1,1786.5 283.9,1790.7 258.0,1714.4 259.4,1472.7 257.1,992.1 253.4,691.9 264.2,524.1 289.3,352.9 336.8,162.3 385.8,181.9 437.6,202.6 1270.4,536.2 1314.0,553.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1151.0,1793.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64145378153617,41.930637931199044]}},{"type":"Feature","properties":{"resourceCoords":[262.0,1793.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64347820404446,41.92998974966623]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0032","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"990.3,1830.5 1049.1,1686.2 595.0,1691.3 112.8,1693.8 110.7,1018.7 275.8,479.7 579.2,602.2 1314.1,899.2 1379.0,925.5 1379.0,930.4 1331.4,960.2 1216.8,1660.8 1084.0,1890.0 990.3,1830.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[117.0,1703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6414419858446,41.930649291196225]}},{"type":"Feature","properties":{"resourceCoords":[116.0,406.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64273761551335,41.932863760035815]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p33","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0033","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"230.8,433.6 481.6,435.4 1208.0,433.0 1208.0,474.1 1208.0,867.2 1208.0,1239.9 1163.5,2081.0 1140.3,2081.0 1097.2,2081.0 1075.8,2038.0 710.2,1968.9 697.3,1891.1 316.5,1892.2 111.0,1952.5 147.1,1001.1 75.5,619.2 118.3,133.3 231.8,111.3 230.8,433.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1208.0,1387.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.685525,41.9349316]}},{"type":"Feature","properties":{"resourceCoords":[1208.0,433.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6855633,41.9367567]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p34","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0034","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"186.0,781.8 186.0,396.1 186.0,351.2 1154.5,428.2 1166.8,440.6 1168.1,1247.3 1186.3,1362.7 1064.7,2081.0 997.2,2081.0 991.4,2031.2 919.1,1986.2 408.7,1956.4 374.4,1809.9 148.3,1806.4 71.3,1652.3 139.9,1652.3 186.0,781.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[186.0,934.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.685525,41.9349316]}},{"type":"Feature","properties":{"resourceCoords":[186.0,441.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6855441,41.9358429]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p35","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0035","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1188.0,60.9 1192.6,567.4 1189.9,964.5 1160.0,1007.3 1222.4,1069.5 1176.0,2028.5 1148.8,2037.8 85.6,2039.9 45.4,1704.0 112.7,1702.8 231.8,985.4 213.2,870.3 209.2,65.2 1188.0,60.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0035/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6836298,41.9359878]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6801942,41.9360192]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68013049999999,41.9321633]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6835661,41.9321319]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p36","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0036","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.6,2018.8 97.8,1054.5 35.9,991.2 66.4,948.5 74.0,548.9 75.5,39.3 1306.3,48.6 1373.9,49.1 1371.3,540.1 1373.0,540.2 1370.3,1041.5 1366.2,1055.9 1379.0,1069.0 1379.0,1792.2 1198.4,2033.2 944.0,2031.0 943.9,2037.2 12.2,2027.9 39.6,2018.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[567.0,1033.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6793947,41.9340954]}},{"type":"Feature","properties":{"resourceCoords":[567.0,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6794541,41.9359171]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.47"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0037","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"10.3,1030.5 8.1,2028.2 1.0,2028.2 1.0,2058.1 23.6,2081.0 1360.0,2081.0 1361.0,2071.0 1379.0,2070.0 1379.0,183.7 1354.8,160.3 1354.3,59.3 1258.2,58.9 9.0,53.1 6.8,1030.4 10.3,1030.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0037/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67747019162334,41.93599080200532]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67576705126895,41.93601787092242]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67571253853558,41.934092889068715]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67741567888997,41.934065820151616]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.18"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0038","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1158.0,1524.4 1176.6,758.6 1149.5,759.0 1136.3,759.1 1159.0,40.0 771.4,41.9 331.9,49.6 26.2,53.1 1.0,53.4 1.0,2032.4 106.6,2031.2 838.0,2023.3 1074.0,2020.8 1196.9,1524.2 1158.0,1524.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67417200238573,41.936081226884106]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67077057517015,41.93609608480157]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67074065355682,41.93225160666947]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6741420807724,41.932236748752004]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0039","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1178.5,2015.6 1125.1,2016.1 350.9,2025.0 122.8,2027.7 244.3,1531.9 205.7,1532.2 223.7,767.8 196.8,768.1 183.8,768.3 205.7,50.5 306.0,49.9 814.4,43.9 1304.2,36.6 1352.7,36.4 1379.0,1207.6 1379.0,2012.6 1346.8,2013.2 1178.5,2015.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[372.0,47.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67090144043733,41.93602774163854]}},{"type":"Feature","properties":{"resourceCoords":[372.0,2009.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67087629818255,41.93239835455287]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0004","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"52.4,1143.9 45.0,45.5 287.2,44.4 463.8,43.6 1060.6,40.9 1269.3,40.0 1324.7,1028.5 1298.6,1028.5 1293.2,1028.5 1310.4,1520.2 1296.4,1520.2 1305.4,2016.8 1212.1,2016.8 1212.2,2044.2 93.1,2013.0 52.4,1143.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[544.0,1525.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66818142987819,41.9260548285458]}},{"type":"Feature","properties":{"resourceCoords":[544.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66824259888514,41.92877226214141]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p40","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0040","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1143.8,54.7 1182.2,55.0 1239.0,55.5 1187.9,543.8 1143.7,543.3 1143.5,1521.6 1222.2,1522.0 1194.1,2009.0 1181.9,2009.0 1142.3,2008.3 207.8,2003.2 190.9,2003.0 189.9,2003.0 207.5,1206.7 207.0,47.4 1143.8,54.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[183.0,2003.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6683896,41.932401]}},{"type":"Feature","properties":{"resourceCoords":[183.0,47.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6685232,41.9360563]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p41","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0041","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"675.6,2025.2 288.6,2023.5 316.9,1531.5 237.4,1531.1 237.5,542.9 282.1,543.3 333.6,50.1 614.8,52.2 1137.3,57.6 1212.3,56.9 1212.9,133.8 1213.0,2028.0 675.6,2025.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1213.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6635832,41.9333892]}},{"type":"Feature","properties":{"resourceCoords":[1213.0,2028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6635501,41.932479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0042","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"184.0,2013.8 199.4,112.3 199.4,35.1 278.7,34.3 1184.2,48.4 1177.0,127.2 1167.2,968.7 1170.6,1280.6 1164.0,1781.8 1159.2,2027.2 184.0,2013.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[192.0,1530.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66357236688243,41.93337086661225]}},{"type":"Feature","properties":{"resourceCoords":[192.0,2022.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66352945085552,41.932464408793145]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p43","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0043","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1203.0,56.0 1203.0,2023.4 231.7,2018.6 234.4,1774.7 236.8,1276.3 230.7,966.3 233.3,129.6 239.8,51.2 1203.0,56.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1203.0,1044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6587782,41.9343723]}},{"type":"Feature","properties":{"resourceCoords":[1203.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6588439,41.9362037]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p44","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0044","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"406.9,2028.0 207.0,2029.0 199.1,41.0 249.7,41.0 443.8,41.3 1185.0,42.0 1189.7,2029.0 406.9,2028.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,2029.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.658713,41.9325569]}},{"type":"Feature","properties":{"resourceCoords":[1185.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6564123,41.9362429]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p45","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0045","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"410.2,2021.2 230.8,2020.8 227.1,51.6 716.8,52.3 1201.9,52.0 1206.0,2022.8 410.2,2021.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,1529.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65632,41.9335081]}},{"type":"Feature","properties":{"resourceCoords":[1205.0,1529.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6538939,41.9335499]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0046","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"203.0,2021.0 201.4,44.8 940.5,44.2 1179.1,44.0 1183.4,2019.8 203.0,2021.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[202.0,548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6539547,41.9353549]}},{"type":"Feature","properties":{"resourceCoords":[203.0,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.653863,41.932636]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0047","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1174.9,45.2 1204.2,38.9 1203.0,457.2 1203.8,1543.7 1205.3,2031.4 225.6,2029.7 227.3,43.1 1174.9,45.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1201.0,1046.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64909026951587,41.93453716518505]}},{"type":"Feature","properties":{"resourceCoords":[1201.0,2031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64902366866461,41.932729052474485]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p48","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0048","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1163.8,796.5 1153.2,1109.5 1142.8,1109.6 1143.3,1400.3 1121.7,2039.0 1042.5,2038.6 200.0,2036.0 199.2,1550.7 199.8,469.6 201.7,53.3 228.7,47.5 742.0,42.5 1045.8,42.4 1177.5,42.3 1011.1,531.9 1014.1,537.1 1163.8,796.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,520.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6491213,41.935525]}},{"type":"Feature","properties":{"resourceCoords":[200.0,2036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6490131,41.9327285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0049","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"966.5,2032.2 574.6,2033.0 397.3,2033.3 240.3,2033.8 230.7,2033.8 249.2,1393.8 247.2,1102.5 257.6,1102.5 266.7,788.9 115.5,529.7 112.4,524.5 276.7,33.2 577.3,31.6 918.0,29.8 1267.4,27.9 1267.4,1163.2 1224.0,1286.6 1130.3,1471.9 1061.0,1635.4 1027.4,1777.5 1030.9,2032.1 1019.3,2032.1 966.5,2032.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[953.0,2041.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64493887729029,41.93279019705007]}},{"type":"Feature","properties":{"resourceCoords":[-133.0,41.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6477452970595,41.936425784890616]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p5","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0005","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1269.0,2053.3 1269.0,52.0 299.8,50.5 258.5,50.5 68.5,50.1 117.4,1028.3 91.5,1028.2 86.2,1028.1 100.2,1514.7 86.4,1514.6 92.3,2005.8 1.0,2005.2 1.0,2032.4 758.6,2058.2 1269.0,2053.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1269.0,2009.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.663327,41.9252159]}},{"type":"Feature","properties":{"resourceCoords":[1269.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6634389,41.9288626]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0050","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1325.8,2038.6 1317.3,1261.8 1232.2,1260.5 1247.8,48.8 265.9,26.1 249.8,1158.5 204.5,1280.9 107.7,1464.4 35.9,1626.5 1.0,1763.9 1.0,2021.8 44.5,2022.3 946.6,2034.0 1325.8,2038.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0050/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64493655247351,41.93654071439807]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64153737683978,41.936637922524106]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6413416138531,41.932795997624794]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64474078948683,41.93269878949876]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0051","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"330.2,2031.5 329.9,2031.5 313.1,1252.7 227.6,1252.4 230.3,37.3 1286.6,43.2 1287.5,196.3 1335.2,344.2 1243.2,1008.5 1267.3,2013.0 1220.4,2049.7 1210.3,2037.8 1137.2,2033.0 330.2,2031.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0051/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64242674849903,41.936595592984894]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63903551331632,41.93666523477902]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63889526368953,41.932832317703]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64228649887225,41.932762675908876]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p53","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0053","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"209.8,1455.0 234.2,1301.2 176.3,779.3 234.9,317.9 239.9,304.2 437.2,301.7 1204.0,302.0 1203.8,1149.5 1141.3,1235.5 1204.0,1298.7 1204.0,1794.0 448.1,1796.5 187.0,1794.6 188.1,1459.2 209.8,1455.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1204.0,302.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6856209,41.9394993]}},{"type":"Feature","properties":{"resourceCoords":[1204.0,1794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6855633,41.9367567]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p54","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0054","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"231.0,46.4 1124.0,46.0 1170.0,46.0 1171.2,300.3 1171.4,1036.0 1177.0,2029.9 1164.7,2017.5 193.0,1940.9 192.7,1577.7 192.6,1535.0 192.2,1040.8 129.7,977.9 191.9,892.0 191.5,46.4 231.0,46.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[193.0,2031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6855441,41.9358429]}},{"type":"Feature","properties":{"resourceCoords":[1170.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6831973,41.9395268]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p55","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0055","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"220.9,1033.2 225.5,298.1 226.0,44.0 266.6,44.3 1160.2,49.8 1203.4,50.1 1203.0,2031.0 220.0,2026.3 220.9,1033.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[226.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6831973,41.9395268]}},{"type":"Feature","properties":{"resourceCoords":[1203.0,2031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6806702,41.935902]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p56","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0056","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"29.4,2022.5 29.9,28.2 68.5,28.4 873.2,33.5 1144.8,32.5 1333.0,33.9 1314.8,536.5 1323.0,536.5 1314.9,1033.7 1325.7,1530.7 1308.5,1530.6 1311.7,2028.7 1266.2,2028.5 29.4,2022.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[46.0,2023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68062940374634,41.93590177947979]}},{"type":"Feature","properties":{"resourceCoords":[46.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68073410025434,41.93952593437154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0057","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"28.3,2024.9 19.7,1531.3 36.9,1531.2 20.7,1038.8 23.4,546.0 15.2,546.0 28.0,47.6 646.8,45.3 694.6,45.1 1352.8,41.6 1378.2,2017.0 1379.0,2064.0 1362.0,2066.0 1361.0,2081.0 735.0,2081.0 724.7,2071.3 724.0,2020.8 675.9,2021.1 28.3,2024.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0057/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67763651784877,41.93968266646792]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67423219582828,41.93970994990126]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67417724810407,41.93586240920115]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67758157012456,41.93583512576781]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0058","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"153.6,48.5 387.1,47.8 448.1,47.6 920.2,46.4 1217.8,45.5 1259.8,542.9 1249.8,543.0 1247.8,1040.2 1244.2,1040.3 1242.9,1538.1 1263.6,1538.0 1219.4,2029.9 953.8,2029.1 512.2,2033.6 205.1,2034.7 173.8,2034.8 153.6,48.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0058/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67467647722331,41.93971788458342]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67129094461326,41.93975179638376]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67122264777785,41.93592548293069]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6746081803879,41.935891571130355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p59","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0059","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"835.6,2031.5 321.8,2026.2 97.0,2022.5 148.0,1529.1 127.4,1528.8 135.7,1028.9 139.2,1028.9 148.2,529.6 158.2,529.6 123.2,29.5 320.5,31.7 363.9,32.1 1326.7,44.8 1374.5,45.5 1379.0,389.5 1379.0,1037.8 1329.1,1037.6 1331.2,1370.5 1330.9,2035.0 835.6,2031.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[368.0,1531.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.670985,41.9369298]}},{"type":"Feature","properties":{"resourceCoords":[368.0,2027.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6709518,41.9360225]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p6","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0006","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"824.9,42.0 1008.7,41.5 1006.7,1023.4 1222.4,1022.7 1232.0,2005.0 1081.8,2005.4 1082.0,2038.7 103.6,2052.1 95.0,44.0 824.9,42.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1232.0,2005.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6605096,41.9252596]}},{"type":"Feature","properties":{"resourceCoords":[95.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6634389,41.9288626]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p60","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0060","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1181.7,55.8 1178.4,1043.1 1178.3,2037.8 224.4,2030.4 175.6,2029.6 175.8,1367.3 173.7,1035.5 223.4,1035.8 223.4,389.6 218.8,46.8 1181.7,55.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6685563,41.936963]}},{"type":"Feature","properties":{"resourceCoords":[200.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6685232,41.9360563]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p61","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0061","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.4,2014.8 216.1,1030.1 218.8,52.6 1188.8,62.1 1189.6,1937.6 1189.0,2022.0 1114.2,2022.8 592.8,2017.6 255.1,2015.1 216.4,2014.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1189.0,542.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6637828,41.9388694]}},{"type":"Feature","properties":{"resourceCoords":[1189.0,2022.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6636845,41.9361255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p62","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0062","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"236.6,2028.5 157.0,2030.0 157.6,1944.9 157.0,53.0 282.6,55.0 1274.3,59.1 1224.3,305.0 1179.7,547.5 1145.6,1042.7 1150.9,1042.7 1151.1,1955.0 1144.5,2035.0 236.6,2028.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[157.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6636845,41.9361255]}},{"type":"Feature","properties":{"resourceCoords":[157.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6638152,41.9397591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p63","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0063","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"113.2,1942.6 112.8,1033.1 107.6,1033.1 141.6,539.4 186.0,297.6 235.9,52.6 270.9,52.8 1277.8,56.9 1322.8,57.1 1316.0,1041.2 1329.8,1041.3 1307.7,2028.4 1125.5,2027.5 1075.0,2027.2 106.5,2022.4 113.2,1942.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1075.0,1540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6588761,41.9371019]}},{"type":"Feature","properties":{"resourceCoords":[1075.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6589743,41.9398377]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p64","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0064","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"81.2,2034.1 98.1,1045.1 84.2,1045.0 85.8,59.3 88.5,59.3 336.0,59.0 1316.0,58.2 1323.3,2033.7 830.9,2033.8 92.1,2034.1 81.2,2034.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[337.0,2034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6576342,41.9362232]}},{"type":"Feature","properties":{"resourceCoords":[336.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6577409,41.9398581]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p65","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0065","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"70.5,2031.6 69.4,49.9 311.9,50.5 515.3,50.9 1057.1,53.6 1206.1,54.5 1317.6,582.9 1284.3,582.8 1314.7,1042.2 1294.5,1042.3 1294.0,1553.0 1301.2,1569.5 1303.6,2031.5 560.0,2032.0 70.5,2031.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[560.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6539867,41.9362838]}},{"type":"Feature","properties":{"resourceCoords":[560.0,51.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6541063,41.939918]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p66","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0066","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.2,2025.8 94.8,1562.2 87.8,1545.5 93.9,1033.1 114.1,1033.3 88.7,571.9 122.1,572.3 16.1,41.0 173.4,43.8 405.1,47.7 761.8,53.8 1172.3,67.4 1332.9,70.0 1324.8,822.5 1317.5,1043.5 1321.5,1305.7 1314.0,2032.0 1284.5,2038.1 333.1,2028.3 92.2,2025.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1054.0,586.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6499152,41.9390118]}},{"type":"Feature","properties":{"resourceCoords":[1314.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6491504,41.936386]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0067","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1333.8,1993.2 897.2,1993.0 590.1,1992.9 71.2,1997.7 43.9,2003.5 47.1,1275.8 41.4,1013.1 47.5,791.6 51.0,37.7 424.5,42.3 1046.5,50.0 1044.1,537.2 1047.8,537.3 1141.5,1218.2 1187.3,1218.7 1379.0,1980.1 1379.0,1988.8 1379.0,1993.2 1333.8,1993.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,1993.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64790000434196,41.93643260758274]}},{"type":"Feature","properties":{"resourceCoords":[62.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64917908274525,41.93823242412131]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0068","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"550.8,1982.4 360.9,1221.1 314.8,1220.5 223.1,540.0 219.3,540.0 223.6,53.5 1224.8,69.9 1205.7,1998.2 851.0,1996.7 551.7,1995.3 550.7,1995.3 550.8,1982.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0068/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64738216598424,41.940087904740544]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64401703028463,41.94017216316359]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64384733495805,41.93636896193906]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64721247065766,41.936284703516016]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p69","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0069","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"211.7,2000.0 216.5,72.7 712.6,75.0 1189.6,76.0 1160.0,809.8 1143.6,809.7 1162.2,1377.8 1197.0,1378.0 1196.5,2010.6 211.7,2000.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1197.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6419798,41.9400752]}},{"type":"Feature","properties":{"resourceCoords":[1197.0,1378.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6418972,41.937695]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p7","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0007","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"179.3,46.5 217.6,46.5 1203.0,52.4 1199.9,2018.2 380.0,2013.0 378.7,1030.0 162.9,1028.9 173.3,46.5 179.3,46.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[380.0,2013.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6605096,41.9252596]}},{"type":"Feature","properties":{"resourceCoords":[1202.0,685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6585489,41.9277654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0070","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"214.5,1987.1 220.1,1362.6 185.7,1362.2 171.8,801.1 188.1,801.3 223.1,77.2 230.4,77.2 1188.4,86.9 1257.7,417.5 1257.3,1999.5 214.5,1987.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64198098627021,41.94007746634523]}},{"type":"Feature","properties":{"resourceCoords":[230.0,2004.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64181835046669,41.93650825346255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p71","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0071","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1073.0,2026.8 1033.2,2026.4 264.8,2018.0 67.0,2018.4 61.6,2012.1 51.2,185.0 100.1,32.4 356.8,38.6 1082.8,45.6 1293.7,47.5 1275.9,1043.6 1287.2,1043.7 1280.3,1539.6 1300.7,1539.8 1276.7,2029.0 1073.0,2026.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1047.0,1528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68561914716234,41.94041372224185]}},{"type":"Feature","properties":{"resourceCoords":[74.0,1528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.688017408134,41.94036702138092]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p72","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0072","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.5,1531.4 89.3,1531.4 93.1,1038.8 82.0,1038.8 93.8,49.4 290.1,50.1 1309.1,53.7 1312.8,1043.0 1323.3,1043.0 1305.8,1535.8 1311.6,1535.8 1311.4,2023.7 863.5,2021.5 823.0,2021.2 777.1,2021.0 88.5,2017.5 109.5,1531.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[823.0,1534.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6832219,41.9404263]}},{"type":"Feature","properties":{"resourceCoords":[823.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6832966,41.9431624]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p73","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0073","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"88.0,1529.8 82.2,1529.8 100.1,1038.0 89.7,1038.0 86.8,50.8 1112.2,55.5 1300.8,56.3 1296.6,1043.1 1300.3,1043.1 1287.5,1535.2 1297.8,1535.3 1287.8,2024.0 612.2,2019.9 574.0,2019.7 530.9,2019.5 87.3,2016.8 88.0,1529.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[574.0,1532.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6808002,41.9404564]}},{"type":"Feature","properties":{"resourceCoords":[574.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6808783,41.9431924]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0074","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.8,2014.5 86.8,1523.0 76.4,1522.9 94.0,1027.9 90.3,1027.8 104.2,35.2 258.1,37.4 1334.1,54.5 1316.5,2032.0 1268.8,2031.3 464.0,2018.0 193.6,2016.5 71.8,2014.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1308.0,1040.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67601869946319,41.941436194107666]}},{"type":"Feature","properties":{"resourceCoords":[1308.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67598074616333,41.940524398502966]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p75","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0075","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1107.7,38.6 1148.0,39.0 1154.6,1033.3 1131.9,1033.5 1130.6,1534.0 1125.7,1534.0 1155.2,2029.5 1107.8,2029.2 874.4,2027.8 213.0,2024.0 213.0,32.3 1107.7,38.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[213.0,1030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6759756,41.9414278]}},{"type":"Feature","properties":{"resourceCoords":[213.0,2024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6759218,41.939613]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p76","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0076","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1150.5,2036.4 655.8,2033.6 184.3,2031.0 170.8,2030.9 141.1,1535.7 146.0,1535.8 147.2,1035.5 169.9,1035.3 163.1,41.6 188.0,41.8 233.0,42.1 1195.0,43.0 1238.8,129.8 1196.0,1033.3 1194.0,2036.6 1150.5,2036.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1195.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6711198,41.9405859]}},{"type":"Feature","properties":{"resourceCoords":[1195.0,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6711999,41.9433134]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p77","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0077","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"231.0,1034.8 271.9,132.6 228.0,46.1 500.8,47.9 1244.2,47.3 1243.6,998.6 1245.2,1538.3 1193.1,1538.1 1193.7,1979.9 1193.4,2041.5 231.0,2036.0 231.0,1034.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[231.0,1044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6711438,41.941487]}},{"type":"Feature","properties":{"resourceCoords":[231.0,2036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6710954,41.9396713]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0078","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.1,1526.3 204.2,1527.0 206.6,987.0 214.2,35.4 368.6,36.5 436.8,37.0 1172.6,42.5 1162.4,2039.6 196.5,2030.6 148.8,2029.9 149.4,1968.3 152.1,1526.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-50.0,1535.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66924883027193,41.94059164038045]}},{"type":"Feature","properties":{"resourceCoords":[205.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6685885991999,41.93969876377788]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p79","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0079","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"205.2,43.1 695.9,42.5 1191.0,42.0 1191.0,2033.9 212.0,2032.1 205.2,43.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1191.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6638381,41.9406738]}},{"type":"Feature","properties":{"resourceCoords":[1191.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6639068,41.9434186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p8","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0008","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1133.6,2028.3 188.0,2026.0 188.0,46.0 1169.5,50.1 1167.4,2004.2 1133.6,2028.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[188.0,1504.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6584971,41.926253]}},{"type":"Feature","properties":{"resourceCoords":[188.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6585891,41.9289394]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0080","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.1,34.0 774.5,37.4 978.7,37.4 1064.8,37.8 1231.5,38.4 1281.2,1033.3 1311.0,1033.5 1319.7,1539.3 1275.3,1539.1 1184.0,2030.3 1156.4,2030.2 163.2,2029.3 37.4,2027.7 47.1,34.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[61.0,2025.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66375714477097,41.93976506194983]}},{"type":"Feature","properties":{"resourceCoords":[61.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66387192018611,41.94339711151507]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0081","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1081.8,2033.6 1033.7,2033.5 20.1,2032.0 12.6,2032.0 104.2,1539.8 148.8,1540.1 140.3,1033.1 110.4,1033.0 61.1,36.0 103.3,36.1 837.2,39.2 1333.7,41.4 1332.8,991.5 1330.5,2034.0 1081.8,2033.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1315.0,1047.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65783742420808,41.94166502117026]}},{"type":"Feature","properties":{"resourceCoords":[1315.0,2034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65777905917616,41.93985742413255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p82","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0082","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1257.9,2033.5 1015.3,2031.1 32.1,2021.3 42.7,980.4 51.2,31.6 538.6,37.6 1270.4,46.6 1272.6,46.6 1281.0,1042.7 1262.3,1042.5 1260.8,2033.5 1257.9,2033.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[540.0,2024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65648853754121,41.93988302617788]}},{"type":"Feature","properties":{"resourceCoords":[540.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65664477371094,41.9435099555405]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p83","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0083","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"819.7,2020.8 277.2,2018.3 76.5,2017.9 70.2,1025.9 88.8,1026.0 72.5,28.9 279.4,29.8 322.0,30.0 901.5,32.9 1197.8,34.5 1079.1,536.7 939.9,609.1 939.9,667.2 1142.6,1030.7 1093.0,1030.5 1297.0,2023.6 1125.9,2022.6 819.7,2020.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0083/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[322.0,1027.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.654165,41.9417343]}},{"type":"Feature","properties":{"resourceCoords":[322.0,30.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6542241,41.9435609]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0084","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"415.6,2021.6 770.3,2023.7 1178.7,2032.6 1338.5,2033.4 1340.3,1711.0 1340.1,1038.3 1343.3,44.5 1101.9,43.2 257.3,38.4 138.8,539.0 1.0,610.6 1.0,670.9 201.9,1031.4 152.5,1031.2 355.6,2021.2 415.6,2021.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1322.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64943493729436,41.943613874621924]}},{"type":"Feature","properties":{"resourceCoords":[1322.0,2030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64931599473562,41.93997849700719]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p85","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0085","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"568.4,2024.8 200.0,2023.0 201.0,1702.6 199.2,1034.3 200.0,47.0 424.9,46.8 1018.0,46.4 1060.9,46.4 1169.9,46.3 1157.0,547.2 1119.5,547.0 1157.9,1039.4 1132.1,1039.3 1181.2,1430.3 1228.4,1430.5 1171.2,2027.8 568.4,2024.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,47.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6493828,41.9436286]}},{"type":"Feature","properties":{"resourceCoords":[200.0,2023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.649275,41.939973]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0086","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"193.6,2032.1 182.7,2032.0 241.9,1432.3 194.2,1432.0 145.5,1039.3 171.5,1039.4 133.9,544.9 171.8,545.2 185.9,42.1 493.8,42.6 811.1,43.2 924.0,43.4 969.1,43.5 1059.6,247.8 1166.5,504.4 1180.7,552.8 1180.5,847.1 1186.7,2039.4 193.6,2032.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0086/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64743040803144,41.943738576543375]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64403669564106,41.94380055291064]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64391187015971,41.93996523667684]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64730558255009,41.93990326030958]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p87","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.75"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0087","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1341.8,1732.8 1329.1,1.0 1260.8,1.0 1257.6,37.7 156.9,35.9 141.5,95.6 44.7,109.8 80.6,259.9 1.0,253.3 1.0,443.2 231.3,1812.3 287.2,2067.8 383.3,2025.1 529.9,2024.7 529.6,2006.2 529.0,1960.4 735.0,1865.2 994.0,1752.5 1042.9,1737.2 1341.8,1732.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0087/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64030840309415,41.94469162129188]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64028009654386,41.94218858802431]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64532156159335,41.942156599067026]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64534986814364,41.9446596323346]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0088","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1271.5,1049.0 1267.7,1529.8 1262.6,2022.2 78.4,2020.0 104.9,326.1 38.1,324.6 64.7,83.9 292.1,25.1 1220.9,98.3 1279.1,85.9 1271.5,1049.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0088/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63948195501956,41.942494438564744]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63937439033423,41.939935331178575]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64452859158972,41.93981376853764]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2082.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64463615627506,41.94237287592381]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p89","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0089","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.1,80.4 568.0,75.2 969.3,72.4 1053.7,71.8 1276.4,70.3 1202.0,1047.9 1255.5,1047.5 1257.6,2026.2 1074.7,2027.5 360.4,2032.3 107.8,2030.2 114.5,2008.0 57.5,1920.5 101.5,1863.1 45.0,1725.0 34.7,1305.2 118.0,205.9 104.4,119.0 49.2,120.4 49.1,80.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1036.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68574766723164,41.944932335696706]}},{"type":"Feature","properties":{"resourceCoords":[1036.0,2023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68572366439976,41.943141077310365]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p9","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0009","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.8,1997.8 217.4,2002.4 219.8,40.5 1199.8,44.7 1205.6,2025.9 223.8,1997.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[218.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6560703,41.9262993]}},{"type":"Feature","properties":{"resourceCoords":[1204.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6536382,41.9263457]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p90","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0090","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"306.6,2019.2 86.1,2018.0 95.8,1032.8 41.9,1032.6 128.7,49.4 307.1,50.3 878.5,53.2 1280.3,55.2 1326.4,55.5 1322.8,2024.5 306.6,2019.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[838.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6834043,41.9468075]}},{"type":"Feature","properties":{"resourceCoords":[838.0,2022.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6832966,41.9431624]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p91","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0091","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"550.0,59.0 1079.1,61.2 1240.8,61.8 1220.4,1045.4 1261.5,1045.6 1262.9,2031.2 1087.8,2030.5 63.3,2025.8 65.5,56.9 550.0,59.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[550.0,2028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6808783,41.9431924]}},{"type":"Feature","properties":{"resourceCoords":[550.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6809824,41.946838]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p92","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0092","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.5,2019.0 72.2,2017.9 72.7,1025.0 31.3,1024.7 53.6,33.8 293.1,35.1 342.1,35.9 1321.5,41.9 1318.4,546.9 1270.1,546.5 1267.2,546.5 1322.1,1532.3 1316.6,1532.2 1316.0,2027.7 239.5,2019.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1304.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67614410268537,41.94597554947828]}},{"type":"Feature","properties":{"resourceCoords":[1304.0,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67605979540731,41.943261071031536]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p93","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0093","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"218.9,1519.9 165.8,536.6 168.7,536.6 216.8,537.1 220.8,33.5 262.1,33.8 859.4,38.5 1191.0,42.0 1254.3,176.9 1089.1,1025.7 1134.2,1026.0 1167.5,2023.5 1163.0,2023.5 1098.4,2022.7 212.0,2014.0 213.4,1519.8 218.9,1519.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1191.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6737256,41.9469276]}},{"type":"Feature","properties":{"resourceCoords":[212.0,2014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6760296,41.9432494]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p94","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0094","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"262.0,2022.3 222.1,2022.0 185.8,1027.6 140.9,1027.5 303.0,180.7 239.5,46.4 739.0,47.7 1217.6,47.1 1212.0,1031.0 1212.5,1282.3 1209.3,1912.0 1212.8,2023.1 262.0,2022.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[723.0,1031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6724708,41.9451273]}},{"type":"Feature","properties":{"resourceCoords":[1212.0,1031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6712557,41.945147]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p95","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0095","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.2,1921.4 61.9,1294.2 60.8,1043.9 64.0,64.0 593.8,62.1 794.7,61.4 1282.5,60.5 1288.7,60.4 1260.8,1045.0 1265.9,1045.0 1273.1,2032.6 1218.4,2032.7 1066.2,2032.7 333.1,2033.7 64.0,2032.0 60.2,1921.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[64.0,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.671295,41.9469656]}},{"type":"Feature","properties":{"resourceCoords":[64.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6711999,41.9433134]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p96","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0096","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"841.2,2023.0 115.8,2021.9 103.2,2021.9 97.9,1034.4 92.8,1034.4 122.5,49.9 313.6,50.0 843.5,50.0 1330.0,50.0 1332.0,1037.9 1326.8,2023.8 841.2,2023.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[362.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.667642,41.9470256]}},{"type":"Feature","properties":{"resourceCoords":[1330.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6652266,41.9470638]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p97","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0097","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1293.0,2037.3 565.0,2037.4 69.0,2038.0 71.6,1040.2 66.8,40.5 606.6,39.1 812.5,38.5 1050.7,37.9 1264.1,37.4 1318.8,547.5 1291.6,547.6 1302.7,1039.3 1283.8,1039.3 1274.3,1536.2 1280.0,1536.1 1299.2,2037.2 1293.0,2037.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[565.0,1537.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6639298,41.9443363]}},{"type":"Feature","properties":{"resourceCoords":[69.0,2038.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6651298,41.9434006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p98","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0098","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"581.2,2027.9 373.2,2027.8 287.4,2027.8 90.1,2028.5 71.6,1529.5 66.0,1529.5 76.1,1034.8 95.0,1034.8 84.6,545.2 111.6,545.1 57.9,37.2 285.5,36.9 818.9,36.2 862.6,36.2 1311.0,35.6 1311.0,2028.0 581.2,2027.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1311.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6591467,41.946223]}},{"type":"Feature","properties":{"resourceCoords":[1311.0,2028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6590733,41.9434897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1894 | sanborn01790_001 p99","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T18:20:04Z","modified":"2026-10-17T18:20:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0099","type":"ImageService3","width":1380,"height":2082},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"110.0,2028.0 110.0,40.0 687.0,38.1 817.6,37.1 1178.1,36.6 1379.0,391.0 1379.0,443.9 1188.4,546.2 1083.8,546.4 1087.0,2028.3 602.6,2028.2 110.0,2028.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[110.0,1037.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6591225,41.945319]}},{"type":"Feature","properties":{"resourceCoords":[110.0,2028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6590733,41.9434897]}}]}}]}