{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01790_024.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1917 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"117"},{"label":"placed","value":"113"},{"label":"unplaced","value":"4"},{"label":"fit sources","value":"georef 86, georef-snap 24, snap:2 1, snap:0 1, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"2 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p0 (tier 1, 41.88109,-87.66559 +/-238m); p111 (tier 1, 41.88103,-87.65328 +/-204m); p63 (tier 1, 41.87316,-87.65197 +/-237m); p69 (tier 1, 41.86909,-87.67728 +/-233m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p1","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0001","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1241.8,0.0 1240.0,1636.0 -0.0,1644.5 -0.0,-0.0 1241.8,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1240.0,939.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6839324,41.8799004]}},{"type":"Feature","properties":{"resourceCoords":[1240.0,1636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6839001,41.8786383]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0010","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"249.9,253.2 512.2,253.8 513.2,11.5 1471.0,0.0 1471.0,33.0 1126.5,46.5 1128.1,255.6 1471.0,256.5 1471.0,550.1 1243.7,549.0 1241.0,964.0 1471.0,964.6 1471.0,1670.3 244.7,1667.8 249.9,253.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6636926,41.8815139]}},{"type":"Feature","properties":{"resourceCoords":[1241.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6619583,41.8802543]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p100","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"1"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0100","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1255.4,1814.9 -0.0,1831.0 -0.0,746.9 246.0,748.0 243.8,321.1 274.6,266.2 456.7,264.2 457.4,120.3 1265.0,152.8 1236.8,264.4 1255.4,1814.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0100/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67928830559444,41.866275776499705]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67569875202254,41.86633593578501]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67559776645062,41.86299563775595]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67918732002252,41.862935478470646]}},{"type":"Feature","properties":{"resourceCoords":[246.0,748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6786443,41.8649213]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0101","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"263.9,163.3 1039.1,158.2 1039.3,272.9 1251.0,272.3 1248.6,1757.8 1465.0,1757.5 1465.0,1831.0 259.4,1831.0 235.9,274.8 263.9,163.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67683140988674,41.86633792654766]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6732610092736,41.86639052989282]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6731733457654,41.86304385979161]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67674374637855,41.86299125644645]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p102","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0102","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1226.2,134.8 1226.0,1770.0 208.5,1771.2 213.7,261.4 -0.0,261.6 -0.0,145.2 1226.2,134.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1226.0,764.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.671299,41.8650192]}},{"type":"Feature","properties":{"resourceCoords":[1226.0,1770.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6712473,41.863211]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p103","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0103","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1465.0,1831.0 -0.0,1831.0 -0.0,1740.1 239.8,1740.0 240.5,0.0 1465.0,4.1 1465.0,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1242.0,750.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6688532,41.8650517]}},{"type":"Feature","properties":{"resourceCoords":[240.0,1740.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6712473,41.863211]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p104","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0104","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"454.7,0.0 1217.8,0.0 1223.2,161.6 1277.8,161.3 1285.1,1794.8 1465.0,1793.9 1465.0,1831.0 466.2,1813.9 454.7,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[238.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6688532,41.8650517]}},{"type":"Feature","properties":{"resourceCoords":[238.0,1238.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6688341,41.864143]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p105","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0105","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.5,1831.0 271.0,0.0 1465.0,0.0 1465.0,31.0 987.8,30.4 985.7,1822.9 267.5,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[243.0,1277.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6663265,41.8641784]}},{"type":"Feature","properties":{"resourceCoords":[243.0,1770.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6663009,41.8632659]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p106","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0106","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1227.0,0.0 1227.0,1831.0 -0.0,1831.0 -0.0,-0.0 1227.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1227.0,778.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6615127,41.8651495]}},{"type":"Feature","properties":{"resourceCoords":[1227.0,1771.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.661465,41.8633485]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p107","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0107","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.1,0.0 977.0,0.0 990.9,1831.0 239.0,1831.0 238.1,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1232.0,774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6590699,41.8651983]}},{"type":"Feature","properties":{"resourceCoords":[239.0,1765.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.661465,41.8633485]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p108","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0108","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.8,1828.2 -0.0,1826.4 -0.0,3.6 252.3,5.5 252.3,0.0 1241.6,0.0 1237.1,1831.0 233.8,1831.0 233.8,1828.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[248.0,776.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6590699,41.8651983]}},{"type":"Feature","properties":{"resourceCoords":[1240.0,776.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6566211,41.8652472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p109","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"1"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0109","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"112.1,267.1 1464.1,274.9 673.0,1453.6 665.5,1782.1 1052.2,1791.0 1052.2,1831.0 108.9,1831.0 112.1,267.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0109/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65696864787942,41.86744545790251]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65337453301117,41.86751602999648]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65325622962493,41.86417604710721]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65685034449318,41.86410547501324]}},{"type":"Feature","properties":{"resourceCoords":[110.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6566211,41.8652472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0011","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"473.0,1650.8 472.4,939.3 240.5,938.9 242.8,520.4 472.1,521.4 471.9,225.3 289.3,224.9 126.1,224.6 124.4,0.0 1209.5,0.0 1209.3,173.7 1244.0,281.2 1244.0,940.0 1014.9,940.1 1013.8,1651.4 473.0,1650.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[833.0,226.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6605649,41.8815647]}},{"type":"Feature","properties":{"resourceCoords":[1244.0,940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6595288,41.8802952]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p110","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0110","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1443.3 901.4,31.4 1467.0,19.6 1467.0,1423.5 448.2,1445.5 456.6,1831.0 -0.0,1831.0 -0.0,1443.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0110/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[469.0,709.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6542574,41.8659643]}},{"type":"Feature","properties":{"resourceCoords":[-67.0,1548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6553638,41.864664]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p112","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0112","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1329.0,1543.0 1330.4,1831.0 -0.0,1831.0 -0.0,268.2 1467.0,263.0 1467.0,1543.9 1329.0,1543.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0112/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65016775216769,41.867558684257446]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64657288750074,41.86760331929561]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64649806364525,41.864262639624265]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6500929283122,41.8642180045861]}},{"type":"Feature","properties":{"resourceCoords":[1329.0,1543.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.646848,41.8647839]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__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 | 1917 | sanborn01790_024 p113 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3640.0"},{"label":"split_canvas_w","value":"5876.0"},{"label":"split_canvas_h","value":"3684.0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1831.0 1469.0,1831.0 1469.0,1799.4 1336.8,1799.4 1336.4,910.8 0.0,918.7 -0.0,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1336.0,1003.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6509789,41.8647152]}},{"type":"Feature","properties":{"resourceCoords":[1336.0,1666.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6509378,41.8634918]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__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 | 1917 | sanborn01790_024 p113 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5876.0"},{"label":"split_canvas_h","value":"3674.8"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,918.7 1043.3,912.5 1034.8,403.9 106.4,420.7 113.4,854.2 -0.0,856.3 -0.0,918.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0113__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[112.0,788.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6565621,41.8634281]}},{"type":"Feature","properties":{"resourceCoords":[599.0,126.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6553638,41.864664]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__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 | 1917 | sanborn01790_024 p114 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3653.6"},{"label":"split_canvas_w","value":"5856.0"},{"label":"split_canvas_h","value":"3670.4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"633.8,1831.0 1464.0,1831.0 1464.0,921.6 1279.1,916.2 1221.8,916.1 632.0,1333.7 633.8,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1088.0,1710.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.646813,41.86357]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,1050.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.646848,41.8647839]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__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 | 1917 | sanborn01790_024 p114 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5856.0"},{"label":"split_canvas_h","value":"3686.4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1464.0,412.4 605.5,405.2 608.9,0.0 0.0,-0.0 -0.0,35.3 256.4,35.3 256.8,914.0 1279.1,916.2 1464.0,921.6 1464.0,412.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0114__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[256.0,128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6509789,41.8647152]}},{"type":"Feature","properties":{"resourceCoords":[256.0,788.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6509378,41.8634918]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p12","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0012","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"191.6,176.2 191.6,4.0 992.2,0.0 986.8,1642.2 -0.0,1642.5 -0.0,936.9 227.2,936.4 226.2,282.9 191.6,176.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[561.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6587524,41.8815942]}},{"type":"Feature","properties":{"resourceCoords":[1221.0,936.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6571032,41.880336]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p13","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0013","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1637.5 -0.0,-0.0 1361.7,0.0 1362.2,226.6 1221.9,227.1 1232.0,1633.0 -0.0,1637.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[889.0,228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6555206,41.8816486]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,1633.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.654614,41.8790938]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p14","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"13"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0014","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"188.7,242.3 329.3,241.6 328.4,14.6 1280.4,0.0 1290.9,1645.3 200.9,1651.0 188.7,242.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[194.0,947.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6546609,41.8803771]}},{"type":"Feature","properties":{"resourceCoords":[1283.0,499.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6520132,41.8812283]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p15","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"13"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0015","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"270.8,1646.3 271.1,2.4 1222.1,0.0 1223.0,1646.0 270.8,1646.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[745.0,241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6508656,41.8817233]}},{"type":"Feature","properties":{"resourceCoords":[1223.0,1646.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6496118,41.8791807]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p16","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0016","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"254.0,1658.0 253.6,14.6 1470.0,0.0 1464.1,1658.0 254.0,1658.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[254.0,1658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6496118,41.8791807]}},{"type":"Feature","properties":{"resourceCoords":[1206.0,1658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6472752,41.8792229]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p17","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0017","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1594.2 4.5,227.4 1229.2,218.5 1232.4,1583.9 -0.0,1594.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[227.0,795.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6863414,41.877547]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,795.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6838666,41.8775814]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p18","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0018","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1231.6,215.4 1233.8,1589.8 251.2,1582.0 248.3,218.2 1231.6,215.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[251.0,794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6838666,41.8775814]}},{"type":"Feature","properties":{"resourceCoords":[1234.0,794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6814433,41.8776156]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p19","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0019","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"249.8,1600.9 234.7,217.2 1008.9,207.8 1030.8,1594.9 249.8,1600.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[737.0,795.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6802326,41.8776327]}},{"type":"Feature","properties":{"resourceCoords":[737.0,214.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6802462,41.878692]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p2","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0002","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1238.2,0.0 1229.8,1624.2 238.8,1627.7 241.3,1593.2 238.2,934.6 240.6,890.1 240.0,217.0 239.1,0.0 1238.2,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[241.0,1241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6839118,41.8793426]}},{"type":"Feature","properties":{"resourceCoords":[240.0,217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6839597,41.8812073]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p20","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0020","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1219.0,1616.5 -0.0,1605.1 -0.0,216.5 1226.3,223.8 1219.0,1616.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[722.0,1611.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6777283,41.876202]}},{"type":"Feature","properties":{"resourceCoords":[722.0,222.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6778143,41.8787314]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0021","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1032.3,1618.7 249.6,1630.7 225.5,227.2 1014.8,219.7 1032.3,1618.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0021/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67712584687493,41.87916080256696]}},{"type":"Feature","properties":{"resourceCoords":[1470.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67358263425925,41.879168775177625]}},{"type":"Feature","properties":{"resourceCoords":[1470.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67356939052029,41.87585952822855]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67711260313597,41.875851555617885]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0022","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1274.9,1306.8 999.4,1623.9 992.6,1623.9 994.1,1831.0 483.7,1831.0 482.5,1625.3 -0.0,1626.6 -0.0,230.1 1235.1,224.8 1237.5,1262.8 1274.9,1306.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[982.0,1624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6722379,41.876273]}},{"type":"Feature","properties":{"resourceCoords":[729.0,227.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6729058,41.878795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0023","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1248.0,1597.0 -0.0,1589.2 277.0,1277.5 240.3,1233.4 249.6,203.2 1251.8,210.2 1248.0,1597.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,903.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6716409,41.8775368]}},{"type":"Feature","properties":{"resourceCoords":[1248.0,1597.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6691392,41.87632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p24","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0024","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.2,204.6 1470.0,206.5 1470.0,1599.6 1209.0,1602.1 1209.0,1601.8 1212.5,1294.2 225.1,1292.5 225.2,204.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[225.0,902.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66918,41.8775823]}},{"type":"Feature","properties":{"resourceCoords":[225.0,1597.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6691392,41.87632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p25","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0025","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1207.0,209.0 1206.7,1614.5 448.1,1624.5 443.2,210.4 1207.0,209.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1207.0,913.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6643135,41.8776709]}},{"type":"Feature","properties":{"resourceCoords":[1207.0,209.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6643484,41.8789306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p26","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0026","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.4,1605.1 228.3,213.4 1229.0,212.0 1229.2,1608.4 227.4,1605.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[228.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6643135,41.8776709]}},{"type":"Feature","properties":{"resourceCoords":[1229.0,212.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66192,41.8789713]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0027","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"232.2,1607.5 231.0,214.0 1233.3,211.9 1234.0,1608.0 232.2,1607.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1234.0,1608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6594112,41.8764842]}},{"type":"Feature","properties":{"resourceCoords":[231.0,214.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66192,41.8789713]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p28","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0028","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1226.9,1344.0 1253.5,1616.4 236.1,1612.0 236.3,219.6 1228.2,218.2 1226.9,1344.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[236.0,914.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6594473,41.8777514]}},{"type":"Feature","properties":{"resourceCoords":[1228.0,914.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6570284,41.8777895]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p29","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0029","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"264.2,1620.7 238.2,1349.5 241.0,229.0 1241.0,229.0 1245.9,1615.3 264.2,1620.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1241.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.654614,41.8790938]}},{"type":"Feature","properties":{"resourceCoords":[241.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6570638,41.8790527]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p3","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0003","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.5,1642.0 225.4,270.1 232.7,171.2 231.6,41.8 231.2,0.0 1233.4,0.0 1227.8,936.6 1471.0,937.8 1471.0,1635.5 229.5,1642.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[229.0,221.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6815259,41.881247]}},{"type":"Feature","properties":{"resourceCoords":[230.0,1642.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6814762,41.8786775]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p30","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0030","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1282.0,244.7 1284.2,1644.5 191.7,1642.5 184.8,246.2 1282.0,244.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[189.0,945.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6545679,41.8778284]}},{"type":"Feature","properties":{"resourceCoords":[1283.0,945.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6519068,41.8778702]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p31","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0031","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1221.4,1619.8 273.0,1615.0 274.9,235.2 1220.6,235.0 1221.4,1619.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1221.0,927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6495697,41.8779093]}},{"type":"Feature","properties":{"resourceCoords":[273.0,1615.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6518681,41.8766033]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p32","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0032","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1467.0,1623.0 246.0,1625.8 246.0,221.0 1467.0,221.5 1467.0,1623.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[246.0,923.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6495697,41.8779093]}},{"type":"Feature","properties":{"resourceCoords":[246.0,221.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6496118,41.8791807]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p33","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0033","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1252.0,324.5 1248.3,1831.0 -0.0,1831.0 -0.0,-0.0 28.0,0.0 26.9,330.0 1252.0,324.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[748.0,1522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6850124,41.8739058]}},{"type":"Feature","properties":{"resourceCoords":[1250.0,1522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6837702,41.8739262]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p34","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0034","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1234.2,313.0 1234.0,1524.0 234.0,1524.0 236.4,302.1 1234.2,313.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[234.0,1524.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6837702,41.8739262]}},{"type":"Feature","properties":{"resourceCoords":[1234.0,1524.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6813426,41.8739659]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p35","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0035","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.0,319.5 1008.2,321.7 1005.2,1520.6 234.9,1522.0 233.0,319.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1237.0,985.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6789191,41.8749803]}},{"type":"Feature","properties":{"resourceCoords":[233.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6814067,41.8761549]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0036","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,334.4 1238.0,336.9 1280.3,1831.0 232.6,1831.0 232.4,1535.1 -0.0,1536.0 -0.0,334.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6795257879735,41.87678676432055]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67597226518265,41.87683442307352]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67589293767668,41.87350863600605]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67944646046753,41.87346097725308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p37","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0037","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1467.0,861.7 990.7,1387.5 992.2,1503.8 279.4,1511.6 231.3,335.9 1467.0,322.6 1467.0,861.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[882.0,1505.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.674878,41.8740693]}},{"type":"Feature","properties":{"resourceCoords":[1374.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6736709,41.8750651]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p38","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0038","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"483.6,858.5 490.5,522.3 992.2,525.2 993.9,1495.3 -0.0,1495.4 -0.0,1379.0 483.6,858.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[389.0,965.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6736709,41.8750651]}},{"type":"Feature","properties":{"resourceCoords":[1233.0,965.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6715826,41.8750981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p39","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0039","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1467.0,328.7 1467.0,1494.5 -0.0,1488.5 -0.0,324.6 1467.0,328.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[238.0,963.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6715826,41.8750981]}},{"type":"Feature","properties":{"resourceCoords":[1231.0,963.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6691061,41.8751404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p4","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0004","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"469.9,946.2 227.2,945.2 232.1,0.0 1237.0,0.0 1266.4,1592.6 1243.1,1635.8 470.4,1642.3 469.9,946.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[734.0,944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6778423,41.8799928]}},{"type":"Feature","properties":{"resourceCoords":[233.0,223.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6790851,41.8812873]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0040","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"492.1,1498.0 491.1,305.4 249.3,304.6 248.8,0.0 1243.9,0.0 1240.8,307.8 1306.1,308.0 1306.2,1515.2 492.1,1498.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66975914439509,41.87686291819765]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66620781883604,41.87692222954888]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66610909564278,41.8735985008141]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66966042120183,41.87353918946287]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0041","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1467.0,1525.7 243.3,1501.6 233.0,282.9 950.9,265.3 956.2,1465.0 1467.0,1486.0 1467.0,1525.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66714912736367,41.87685942943743]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66363098482091,41.876896303236535]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66356960875275,41.873603629388825]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66708775129551,41.87356675558972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p42","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0042","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1231.2,1523.5 499.1,1518.4 499.2,1479.3 -0.0,1456.5 -0.0,275.3 1228.0,275.0 1231.2,1523.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1228.0,922.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6618187,41.8752663]}},{"type":"Feature","properties":{"resourceCoords":[1228.0,275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6618478,41.876448]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0043","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1467.0,1560.0 253.6,1582.2 232.0,299.7 1467.0,281.2 1467.0,1560.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66240098352856,41.87697918410478]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65892225432681,41.876990171953224]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65890396512025,41.87373439324223]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66238269432199,41.87372340539379]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0044","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.9,1288.1 414.0,308.4 1235.2,298.9 1247.2,942.8 1179.8,942.3 1209.0,1270.9 412.9,1288.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0044/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65992653354694,41.87704639904541]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65637230571103,41.8770605599201]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65634873500599,41.87373412346629]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6599029628419,41.8737199625916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0045","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"304.6,1488.5 235.2,1490.5 181.2,928.6 248.2,928.9 234.4,289.5 1467.0,260.4 1467.0,1504.0 305.4,1530.3 304.6,1488.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65750364570026,41.87704377766526]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65392482297678,41.87705021475043]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65391410847158,41.873700762561114]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65749293119507,41.87369432547594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p46","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0046","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1283.0,1525.5 424.5,1529.8 445.4,285.0 1283.0,285.0 1283.0,1525.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1283.0,285.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6518681,41.8766033]}},{"type":"Feature","properties":{"resourceCoords":[200.0,285.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6545255,41.8765653]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p47","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0047","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.7,1543.6 271.8,283.2 986.8,285.8 1058.5,1542.9 1055.2,1831.0 584.5,1831.0 267.7,1543.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[268.0,612.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6518594,41.8760119]}},{"type":"Feature","properties":{"resourceCoords":[268.0,1524.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6518098,41.8743721]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p48","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0048","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"684.0,1522.8 -0.0,1521.5 -0.0,285.2 1459.7,281.4 1467.0,1575.9 1115.3,1581.8 684.0,1522.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[720.0,286.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6483736,41.8766563]}},{"type":"Feature","properties":{"resourceCoords":[250.0,286.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6495276,41.8766365]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0049","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1247.5,1643.4 254.4,1652.5 255.2,1748.5 9.0,1749.9 -0.0,558.4 1238.8,544.0 1247.5,1643.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0049/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68675063995687,41.87431476494355]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68322070244061,41.87434217911124]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6831750736412,41.87103833534357]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68670501115746,41.87101092117588]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0005","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.1,1641.8 263.0,1598.8 252.5,7.4 1471.0,0.0 1471.0,1655.0 239.1,1641.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0005/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67725972054906,41.88171743903324]}},{"type":"Feature","properties":{"resourceCoords":[1471.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67370212030202,41.88178515103813]}},{"type":"Feature","properties":{"resourceCoords":[1471.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67358971182776,41.87846486797806]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6771473120748,41.87839715597317]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p50","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0050","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1230.2,1152.3 1467.0,1146.5 1467.0,1384.7 231.5,1370.6 242.5,230.8 1235.9,236.6 1230.2,1152.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[229.0,1634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6837078,41.8713727]}},{"type":"Feature","properties":{"resourceCoords":[1231.0,1023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6813012,41.872535]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p51","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0051","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"236.8,1157.0 232.2,241.0 1020.2,236.7 1047.8,1389.6 489.3,1391.9 489.2,1646.9 239.0,1647.0 240.8,1831.0 -0.0,1831.0 -0.0,1386.8 488.9,1386.8 473.6,1148.5 236.8,1157.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1234.0,659.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6788783,41.8732356]}},{"type":"Feature","properties":{"resourceCoords":[239.0,1647.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6812692,41.8714085]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0052","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1831.0 -0.0,1133.5 -0.0,213.8 216.9,217.9 210.3,516.2 1266.6,540.2 1258.4,1658.3 1084.2,1655.9 1055.0,1831.0 378.6,1831.0 360.1,1831.0 -0.0,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0052/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67943837634425,41.87438236158131]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67592401083024,41.87448948688417]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67574534325949,41.871193482399285]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6792597087735,41.871086357096424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0053","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"968.7,1635.2 256.1,1655.8 195.2,267.3 924.0,245.8 968.7,1635.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0053/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67684167993978,41.874544190017296]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6732457646707,41.87451561239489]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6732934275392,41.87114312835872]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6768893428083,41.871171705981126]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p54","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0054","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1233.0,276.0 1233.0,1685.0 -0.0,1683.7 -0.0,275.8 1233.0,276.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1233.0,276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6715675,41.8741212]}},{"type":"Feature","properties":{"resourceCoords":[1233.0,1685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714938,41.8715591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p55","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0055","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1259.5,231.2 1251.0,1632.0 251.0,1631.0 248.5,228.6 1259.5,231.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1249.0,927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.669079,41.8728811]}},{"type":"Feature","properties":{"resourceCoords":[251.0,1631.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714938,41.8715591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p56","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0056","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1255.4,1619.7 254.8,1634.2 242.0,225.0 487.9,220.1 1228.7,224.7 1255.4,1619.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.0,925.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.669079,41.8728811]}},{"type":"Feature","properties":{"resourceCoords":[242.0,225.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6690868,41.8741526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p57","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0057","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.9,281.1 962.8,302.3 967.0,1639.9 215.0,1639.7 215.9,281.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.0,1640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6665316,41.8716283]}},{"type":"Feature","properties":{"resourceCoords":[1195.0,1640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6641447,41.8716716]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p58","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0058","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"232.8,1372.2 231.7,1636.0 -0.0,1635.2 -0.0,275.9 1226.4,303.2 1219.4,1378.3 232.8,1372.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[720.0,1638.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6629411,41.8716927]}},{"type":"Feature","properties":{"resourceCoords":[1226.0,284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6617861,41.8742031]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0059","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.6,1359.6 264.2,281.4 1016.6,279.4 1021.5,832.9 1037.1,832.9 1464.0,832.4 1464.0,1376.3 267.6,1359.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66243313174995,41.87466787397092]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65890309810793,41.87471580218737]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65882316107196,41.87140512675018]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66235319471399,41.87135719853374]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p6","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0006","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1229.0,1642.4 445.2,1643.5 434.9,2.3 1227.7,3.5 1229.0,1642.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1228.0,944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6717103,41.8800903]}},{"type":"Feature","properties":{"resourceCoords":[1227.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.671746,41.8813979]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0060","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"656.6,1371.5 656.5,1339.0 436.8,1339.5 441.3,827.1 -0.0,823.7 -0.0,271.6 91.5,232.0 91.5,0.0 1243.7,0.0 1262.0,238.2 1332.0,237.8 1331.9,280.1 1261.9,279.9 1256.0,982.9 1313.1,982.9 1270.3,1377.1 656.6,1371.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0060/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65998743555191,41.874688467593934]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65644844048322,41.874759897585456]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65632930634023,41.87144080898141]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65986830140892,41.87136937898989]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0061","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"205.5,977.1 186.2,283.5 1466.0,240.9 1466.0,1578.8 239.4,1619.3 261.7,975.1 205.5,977.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0061/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65736922822114,41.8747693433891]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65377231296789,41.87474437423937]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6538139008005,41.871375564997145]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65741081605375,41.87140053414687]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0062","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1410.2,1831.0 1401.7,1319.2 1365.4,1319.5 1360.4,1831.0 933.5,1831.0 931.8,1592.7 302.1,1599.3 332.8,242.1 1466.0,230.1 1466.0,1831.0 1410.2,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0062/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65459012743057,41.874732129719234]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65104548053296,41.87476756623707]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65098645861823,41.87144770851049]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65453110551586,41.871412271992654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0064","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,220.9 1431.0,259.5 1427.9,0.0 1466.0,0.0 1466.0,1831.0 8.8,1831.0 -0.0,220.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64990576445379,41.87476752419249]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64638947032753,41.87479700379944]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64634036967949,41.87150372568605]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64985666380575,41.871474246079096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0065","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,371.5 247.3,369.9 246.5,273.4 1244.3,263.3 1258.3,1831.0 -0.0,1831.0 -0.0,371.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0065/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68669372940757,41.87182452741608]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68318292229225,41.871849246882874]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6831417521534,41.868560938914605]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68665255926872,41.86853621944781]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p66","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0066","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"213.2,0.0 975.3,0.0 975.3,445.6 1216.9,445.6 1215.0,261.0 1466.0,260.9 1445.3,1556.4 216.0,1556.0 213.2,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[216.0,1556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6836506,41.86903]}},{"type":"Feature","properties":{"resourceCoords":[1215.0,261.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6812692,41.8714085]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0067","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"401.9,0.0 974.9,0.0 984.0,456.4 1366.0,448.7 396.1,1466.2 401.9,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0067/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68162495051588,41.87186535370513]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67813445594909,41.871918937832575]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67804521181021,41.86864965740805]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.681535706377,41.86859607328061]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p68","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0068","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"804.5,372.5 1466.0,262.8 1466.0,1413.3 -0.0,1616.0 -0.0,1513.7 804.5,372.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[125.0,1599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6803509,41.8690691]}},{"type":"Feature","properties":{"resourceCoords":[938.0,166.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6779691,41.8714547]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p7","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"9"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0007","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.0,1648.0 226.9,0.0 1225.7,0.0 1232.0,1648.0 227.0,1648.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[227.0,1648.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6716754,41.8788131]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,1648.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6692204,41.878849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0070","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1281.2,1583.7 -0.0,1574.2 -0.0,761.1 76.4,256.2 1286.5,263.0 1281.2,1583.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67687354532299,41.87193833248315]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67335621544775,41.87200686681886]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67324207164066,41.86871245640023]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6767594015159,41.86864392206452]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p71","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0071","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"315.5,1559.2 316.4,261.6 1242.0,264.0 1242.0,1561.0 315.5,1559.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1242.0,264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714938,41.8715591]}},{"type":"Feature","properties":{"resourceCoords":[1242.0,1561.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714221,41.8691837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p72","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0072","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.3,260.7 1228.3,264.8 1225.8,1562.0 227.0,1562.0 227.3,260.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[728.0,1562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.670194,41.8692045]}},{"type":"Feature","properties":{"resourceCoords":[227.0,1562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714221,41.8691837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p73","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0073","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1224.3,1567.7 227.9,1564.3 231.6,266.7 1227.5,271.4 1224.3,1567.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[731.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6677406,41.8692438]}},{"type":"Feature","properties":{"resourceCoords":[731.0,268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.667816,41.8716124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p74","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0074","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"197.1,268.0 1196.5,267.0 1196.5,1831.0 192.4,1831.0 197.1,268.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1196.0,1563.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6640712,41.8693013]}},{"type":"Feature","properties":{"resourceCoords":[1196.0,267.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6641447,41.8716716]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p75","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0075","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1224.3,0.0 1226.0,1568.0 232.2,1568.2 229.6,0.0 1224.3,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,266.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6641447,41.8716716]}},{"type":"Feature","properties":{"resourceCoords":[1226.0,1568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6616419,41.8693403]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0076","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"84.5,0.0 1466.0,0.0 1466.0,1563.1 74.2,1552.0 84.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66193756817195,41.87221368036003]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65831322587215,41.87229319408312]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65818079527203,41.86889856992441]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66180513757183,41.868819056201325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p77","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0077","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"739.0,25.3 737.3,280.7 1264.2,278.7 1255.6,1574.6 150.2,1572.5 136.5,23.9 231.8,24.2 231.8,23.8 739.0,25.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[114.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.658315,41.8703411]}},{"type":"Feature","properties":{"resourceCoords":[732.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6567932,41.870364]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p78","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0078","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1337.0,1565.0 -0.0,1577.5 -0.0,267.5 1328.2,253.7 1337.0,1565.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[530.0,262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6542303,41.8718321]}},{"type":"Feature","properties":{"resourceCoords":[1337.0,1565.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.652221,41.869488]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p79","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0079","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"101.0,1569.0 100.9,504.2 521.3,507.1 520.9,0.0 565.8,0.0 570.4,507.4 625.3,507.8 628.8,0.0 1466.0,0.0 1466.0,28.9 1093.3,29.6 1095.5,1350.2 898.0,1353.8 902.0,1575.8 101.0,1569.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[101.0,1569.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.652221,41.869488]}},{"type":"Feature","properties":{"resourceCoords":[101.0,268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6522857,41.8718668]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p8","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0008","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.0,1636.5 234.6,0.0 1283.0,0.0 1283.9,229.6 1471.0,229.0 1471.0,322.1 1278.8,539.0 1281.0,1632.8 242.0,1636.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[235.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6693033,41.8814295]}},{"type":"Feature","properties":{"resourceCoords":[242.0,1636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6692204,41.878849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p80","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0080","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1313.0,1831.0 1309.0,1587.8 -0.0,1594.8 -0.0,487.5 1466.0,503.1 1466.0,1831.0 1313.0,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1181.0,259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6470333,41.8719258]}},{"type":"Feature","properties":{"resourceCoords":[1181.0,1563.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6469654,41.8696118]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p81","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0081","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"9.4,1422.1 8.5,1831.0 -0.0,1831.0 8.6,379.9 993.1,391.5 989.9,1424.3 9.4,1422.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[726.0,934.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.684843,41.8675405]}},{"type":"Feature","properties":{"resourceCoords":[726.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6848852,41.8690151]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p82","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0082","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"167.1,1429.4 -0.0,1430.5 -0.0,141.6 1466.0,144.7 1466.0,1463.0 1216.2,1464.0 1215.8,1831.0 227.4,1831.0 227.1,1546.8 167.1,1429.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6836145,41.8675576]}},{"type":"Feature","properties":{"resourceCoords":[230.0,142.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6836506,41.86903]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0083","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1466.0,136.8 1466.0,1802.0 1340.9,1800.5 1340.0,1682.5 110.5,1692.2 109.0,1485.7 365.0,1482.5 353.6,141.2 451.7,140.8 451.7,140.7 1466.0,136.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68144655577322,41.86931612042305]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67790159795695,41.86934245924458]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67785773254515,41.86602203215524]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68140269036142,41.865995693333716]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0084","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"495.2,1831.0 475.6,139.0 823.6,133.7 840.0,0.0 943.8,0.0 938.3,131.9 1189.8,128.2 1192.1,1482.0 1129.0,1483.1 1140.9,1831.0 495.2,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0084/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67902970255886,41.86934398572825]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67554089243372,41.86933958064721]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67554822878853,41.86607174912327]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67903703891368,41.866076154204315]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p85","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0085","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"167.3,1478.5 228.7,1479.2 262.9,165.1 980.3,169.6 975.5,1822.8 169.7,1831.0 167.3,1478.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0085/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6768534905085,41.86940236382582]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67326170727522,41.86947272700441]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67314452258407,41.86610843690821]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67673630581736,41.86603807372963]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p86","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0086","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1232.0,169.0 1230.9,1831.0 -0.0,1831.0 -0.0,165.8 1232.0,169.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0086/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67445025507195,41.86944024804009]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67085829365564,41.86950183367714]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67075498427597,41.866161575042376]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67434694569228,41.86609998940533]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,169.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714221,41.8691837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p87","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0087","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"991.2,134.0 987.4,1673.0 219.7,1672.4 221.0,134.0 991.2,134.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[221.0,134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6714221,41.8691837]}},{"type":"Feature","properties":{"resourceCoords":[1220.0,134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6689736,41.8692252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p88","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0088","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1208.3,1831.0 1203.6,1670.8 -0.0,1664.0 -0.0,143.6 1210.4,143.0 1202.1,1477.4 1466.0,1476.7 1466.0,1614.5 1264.5,1614.6 1262.5,1831.0 1208.3,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[723.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6677406,41.8692438]}},{"type":"Feature","properties":{"resourceCoords":[226.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6689736,41.8692252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p89","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0089","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1190.2,440.3 1190.7,609.9 1466.0,609.6 1466.0,1459.0 967.6,1460.8 968.0,1654.1 444.5,1654.5 444.4,1515.9 177.2,1516.7 183.4,443.3 1190.2,440.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0089/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6669931298917,41.86957634344985]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66340188627953,41.86963011293931]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66331233665875,41.86626634694054]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66690358027091,41.86621257745108]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0009","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.7,1670.2 244.2,559.4 441.1,337.9 441.3,245.0 249.9,245.2 249.3,12.0 1471.0,0.0 1471.0,244.0 1205.0,244.3 1205.5,1668.6 244.7,1670.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66733412661335,41.88189814634387]}},{"type":"Feature","properties":{"resourceCoords":[1471.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66379215684195,41.8819530673847]}},{"type":"Feature","properties":{"resourceCoords":[1471.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6637009826786,41.87864736945357]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66724295245001,41.87859244841274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p90","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0090","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"500.0,602.7 224.7,602.7 224.0,163.0 1216.0,163.0 1220.7,1687.4 -0.0,1654.2 -0.0,1459.5 498.5,1458.4 500.0,602.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[224.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6640712,41.8693013]}},{"type":"Feature","properties":{"resourceCoords":[1216.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6616419,41.8693403]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p91","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0091","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"247.7,1673.3 243.0,173.0 1236.0,173.0 1235.6,1675.6 247.7,1673.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[243.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6616419,41.8693403]}},{"type":"Feature","properties":{"resourceCoords":[1236.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6591892,41.8693796]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p92","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0092","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.6,1692.1 239.0,176.0 1230.7,176.0 1240.5,1686.8 238.6,1692.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[612.0,176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582782,41.8693942]}},{"type":"Feature","properties":{"resourceCoords":[239.0,176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6591892,41.8693796]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p93","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0093","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.6,1546.8 81.7,1542.6 75.3,207.1 1467.0,213.0 1467.0,1494.8 1423.6,1546.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1109.0,213.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6542185,41.8694526]}},{"type":"Feature","properties":{"resourceCoords":[689.0,213.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6552553,41.8694343]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p94","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0094","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1434.9,439.4 1432.7,1302.9 1407.0,1395.4 1380.1,1308.7 1383.2,447.4 1408.5,329.4 1434.9,439.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[955.0,213.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.652221,41.869488]}},{"type":"Feature","properties":{"resourceCoords":[132.0,213.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6542185,41.8694526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p95","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0095","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"36.4,1519.0 104.2,1466.8 79.7,1466.8 76.0,183.4 527.8,182.1 1467.0,190.5 1467.0,1516.0 1337.1,1516.2 1335.8,1831.0 507.3,1831.0 512.8,1517.3 36.4,1519.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0095/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6535317,41.8698021]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6499145,41.8698583]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6498204,41.866496299999994]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6534376,41.8664401]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p96","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0096","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"118.6,1560.1 142.4,226.2 -0.0,222.4 -0.0,-0.0 197.9,0.0 194.1,226.9 1467.0,242.2 1454.7,1585.1 118.6,1560.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0096/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6502748169327,41.86991096246574]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64668214022599,41.87001445211098]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64650865556959,41.866675805694]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6501013322763,41.86657231604876]}},{"type":"Feature","properties":{"resourceCoords":[1343.0,216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6469654,41.8696118]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p97","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0097","type":"ImageService3","width":1467,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1831.0 -0.0,46.5 1166.1,45.8 1227.0,165.0 1227.0,1035.0 980.1,1034.7 979.1,1831.0 -0.0,1831.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1227.0,1035.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6835533,41.8648559]}},{"type":"Feature","properties":{"resourceCoords":[1227.0,553.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6835759,41.8657323]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p98","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0098","type":"ImageService3","width":1464,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,742.0 246.0,742.0 245.2,162.4 1244.7,162.0 1249.8,1245.2 1464.0,1245.0 1464.0,1831.0 -0.0,1831.0 -0.0,742.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[246.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6835533,41.8648559]}},{"type":"Feature","properties":{"resourceCoords":[1245.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6811055,41.8648885]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1917 | sanborn01790_024 p99","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T07:07:53Z","modified":"2026-09-21T07:07:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0099","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"259.8,1245.9 254.7,0.0 1465.0,0.0 1465.0,260.5 1283.3,263.3 1252.8,318.2 1257.0,744.0 1011.6,744.0 1013.9,1245.2 259.8,1245.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790191707:01790_07_1917-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[255.0,744.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6811055,41.8648885]}},{"type":"Feature","properties":{"resourceCoords":[1257.0,744.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6786443,41.8649213]}}]}}]}