{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_111.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1951 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"99"},{"label":"placed","value":"97"},{"label":"unplaced","value":"2"},{"label":"fit sources","value":"georef 77, georef-snap 19, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"1 sheet(s) cut into 2 panels"},{"label":"unplaced pages","value":"p18 (tier 1, 41.78696,-87.67855 +/-258m); p80__2 (tier 1, 41.77016,-87.71432 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p1","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0001","type":"ImageService3","width":1471,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.8,2058.2 233.8,2108.3 202.9,2107.2 168.7,2105.9 144.4,1939.1 212.8,1142.2 83.5,607.2 175.5,91.7 730.7,51.5 1232.0,107.6 1232.0,2055.9 233.8,2058.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1232.0,1556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7204383,41.7832522]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,561.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.720489,41.7850679]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0010","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.0,111.0 594.3,47.5 1215.8,112.2 1234.1,101.7 1234.2,2057.8 240.2,2058.2 239.0,111.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[739.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6995814,41.7826771]}},{"type":"Feature","properties":{"resourceCoords":[739.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6996814,41.7863102]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0011","type":"ImageService3","width":1477,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"240.2,114.9 334.1,61.1 614.9,59.4 1146.8,62.8 1239.0,113.8 1239.0,2063.7 240.9,2064.2 240.2,114.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1239.0,1067.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6959789,41.7845534]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6960282,41.7863681]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0012","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"337.5,57.8 1041.9,72.2 1248.3,120.9 1248.7,2062.8 251.5,2063.2 252.1,105.3 337.5,57.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[751.0,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6947116,41.7827529]}},{"type":"Feature","properties":{"resourceCoords":[751.0,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6948117,41.7863874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p13","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0013","type":"ImageService3","width":1477,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"307.2,69.6 810.9,57.6 1173.5,65.0 1227.0,109.6 1230.3,1030.0 1230.5,2072.1 232.3,2072.7 231.5,134.6 307.2,69.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[733.0,1073.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6923244,41.7846115]}},{"type":"Feature","properties":{"resourceCoords":[733.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6923739,41.786426]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p14","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0014","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"255.8,2058.2 255.8,1012.9 252.8,89.7 272.2,105.9 1134.7,56.8 1244.9,111.1 1256.0,107.5 1254.5,2057.9 255.8,2058.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[754.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6898455,41.7828287]}},{"type":"Feature","properties":{"resourceCoords":[1256.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6887234,41.7864838]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p15","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0015","type":"ImageService3","width":1468,"height":2127},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.8,123.5 447.6,50.5 1215.5,118.2 1227.6,109.3 1227.0,2066.0 226.2,2066.1 227.8,123.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1227.0,2066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6861786,41.7828858]}},{"type":"Feature","properties":{"resourceCoords":[726.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.687505,41.7865031]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0016","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.8,114.3 331.0,51.3 1090.7,65.6 1236.4,106.3 1240.2,1066.8 1236.5,2092.9 1168.9,2064.4 248.9,2066.3 245.8,114.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6862413569064,41.784699561907196]}},{"type":"Feature","properties":{"resourceCoords":[242.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68628775601582,41.78653491908398]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0017","type":"ImageService3","width":1468,"height":2127},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.7,2099.9 39.3,2064.1 38.4,1046.0 38.1,1019.9 44.0,1019.0 45.0,978.0 37.8,977.8 30.1,93.1 82.3,107.4 588.5,26.8 1122.7,41.7 1385.5,90.3 1371.0,594.3 1433.2,858.8 1356.0,1135.9 1407.8,1612.5 1320.7,2079.2 39.8,2107.9 39.7,2099.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[49.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68373250137284,41.78288085214343]}},{"type":"Feature","properties":{"resourceCoords":[49.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68380153558952,41.786494204070216]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p19","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0019","type":"ImageService3","width":1468,"height":2127},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1391.0,2084.1 95.8,2076.6 50.5,2062.4 45.8,1077.5 70.0,1078.0 73.0,1066.0 73.0,1031.0 45.6,1029.9 41.9,254.6 105.4,55.0 931.6,26.9 1347.8,42.6 1413.7,96.0 1433.1,2100.2 1391.0,2084.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1391.0,2091.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6739995,41.7829805]}},{"type":"Feature","properties":{"resourceCoords":[1391.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6740971,41.7866255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p2","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0002","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"219.3,2058.5 221.0,94.8 288.1,102.4 672.2,48.1 732.0,48.1 1232.2,106.1 1230.0,2057.0 219.3,2058.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1230.0,2057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7179589,41.7823823]}},{"type":"Feature","properties":{"resourceCoords":[221.0,48.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7205146,41.78598]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p20","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0020","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.4,1693.0 71.0,44.9 1348.0,56.2 1348.0,53.0 1389.5,72.2 1402.7,2050.2 1342.3,2089.9 1343.5,2051.9 801.2,2051.1 197.1,2051.6 64.2,2051.3 65.2,1737.0 62.0,1736.8 61.1,1693.2 65.4,1693.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[845.0,2051.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6751273,41.779303]}},{"type":"Feature","properties":{"resourceCoords":[1348.0,63.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6739995,41.7829805]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p21","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0021","type":"ImageService3","width":1471,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.0,102.1 229.4,52.0 1229.0,59.0 1210.4,2058.8 217.8,2050.0 230.2,1637.4 159.2,1539.0 219.8,511.8 163.8,99.1 229.0,102.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[211.0,2050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7227533,41.7786563]}},{"type":"Feature","properties":{"resourceCoords":[1229.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7204127,41.7823399]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0022","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"217.0,2047.0 223.4,42.1 1230.0,43.0 1224.7,1548.8 1222.4,2049.7 217.0,2047.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[217.0,2047.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7203108,41.7786952]}},{"type":"Feature","properties":{"resourceCoords":[1230.0,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7179589,41.7823823]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p23","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0023","type":"ImageService3","width":1471,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1071.9,2047.0 223.1,2045.5 225.0,1550.0 228.8,60.4 1227.9,60.4 1223.5,1797.2 1219.3,2045.7 1071.9,2047.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[225.0,1550.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7178835,41.7796449]}},{"type":"Feature","properties":{"resourceCoords":[225.0,556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7179401,41.7814714]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p24","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0024","type":"ImageService3","width":1461,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"183.4,1812.0 173.0,55.0 1258.2,45.7 1261.5,300.2 1268.1,1998.8 1276.0,2052.0 1246.5,2038.7 1137.5,2040.2 1095.3,2054.3 181.3,2063.3 183.4,1812.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1276.0,2052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7127384,41.7788259]}},{"type":"Feature","properties":{"resourceCoords":[173.0,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.715497,41.7824248]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p25","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0025","type":"ImageService3","width":1471,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1010.0,2037.9 269.4,2037.6 261.8,1984.9 262.0,304.0 259.8,52.1 1205.6,50.1 1212.5,2036.0 1010.0,2037.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[262.0,1537.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7127796,41.7797446]}},{"type":"Feature","properties":{"resourceCoords":[262.0,549.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.712825,41.7815584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p26","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0026","type":"ImageService3","width":1461,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"641.5,2039.3 232.1,2038.1 232.7,40.5 1223.0,42.0 1223.0,2043.2 641.5,2039.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1223.0,1536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080191,41.779818]}},{"type":"Feature","properties":{"resourceCoords":[1223.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7081013,41.7825445]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0027","type":"ImageService3","width":1468,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.0,53.6 1219.0,55.2 1215.8,2051.7 1192.3,2067.6 1102.0,2067.0 1065.7,2051.8 225.1,2052.7 225.0,53.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[225.0,1546.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080191,41.779818]}},{"type":"Feature","properties":{"resourceCoords":[225.0,554.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080737,41.7816303]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p28","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0028","type":"ImageService3","width":1469,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"998.1,2052.3 247.4,2058.9 236.6,47.9 1230.3,42.5 1244.0,2052.0 998.1,2052.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.0,1050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705615,41.7807647]}},{"type":"Feature","properties":{"resourceCoords":[1244.0,2052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7031399,41.7789752]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p29","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0029","type":"ImageService3","width":1468,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.0,56.2 1238.6,60.1 1231.3,2057.6 233.0,2052.0 238.0,56.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1235.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7007466,41.7808394]}},{"type":"Feature","properties":{"resourceCoords":[233.0,2052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7031399,41.7789752]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p3","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0003","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"211.0,2058.0 216.3,122.0 314.1,133.4 648.5,59.9 1158.5,64.4 1222.5,107.3 1217.3,2058.2 211.0,2058.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7155471,41.7842422]}},{"type":"Feature","properties":{"resourceCoords":[211.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7179589,41.7823823]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p30","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0030","type":"ImageService3","width":1469,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.8,45.5 1214.7,44.5 1215.9,2059.3 219.2,2058.3 216.8,45.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[718.0,1049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6995314,41.7808575]}},{"type":"Feature","properties":{"resourceCoords":[218.0,1049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7007466,41.7808394]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p31","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0031","type":"ImageService3","width":1468,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1232.7,47.6 1229.2,2043.5 608.6,2044.1 233.6,2043.0 236.4,46.4 1232.7,47.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.0,1043.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6971039,41.7808934]}},{"type":"Feature","properties":{"resourceCoords":[732.0,47.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6971576,41.7827148]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p32","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0032","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1234.0,37.4 1235.0,2038.1 241.0,2037.0 241.0,38.0 1234.0,37.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[241.0,2037.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6958305,41.7790837]}},{"type":"Feature","properties":{"resourceCoords":[241.0,38.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6959296,41.7827339]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p33","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0033","type":"ImageService3","width":1468,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.9,59.2 1232.0,58.8 1232.2,2055.7 837.6,2054.8 814.8,2067.4 737.0,2054.6 239.6,2054.0 238.9,59.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[737.0,1057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6922248,41.780963]}},{"type":"Feature","properties":{"resourceCoords":[737.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6922748,41.7827908]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0034","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"738.6,2046.0 722.2,2025.8 636.5,2025.0 621.2,2046.2 243.5,2050.0 223.1,50.8 1214.8,40.2 1234.0,2042.0 738.6,2046.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,1044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.69101711822113,41.780992733718016]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68858376652179,41.78283204238483]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0035","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"249.7,52.4 1242.4,51.5 1243.2,2040.0 249.4,2044.0 249.7,52.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[744.0,1047.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6873584,41.7810371]}},{"type":"Feature","properties":{"resourceCoords":[744.0,2042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6873093,41.7792076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0036","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1111.5,2037.8 260.9,2044.4 237.3,45.6 1156.8,34.4 1224.5,62.2 1225.2,98.3 1225.8,138.2 1238.7,936.5 1245.7,2053.3 1111.5,2037.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[746.0,1046.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68490937329155,41.781063758726766]}},{"type":"Feature","properties":{"resourceCoords":[746.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68493065390876,41.782893221031465]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0037","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"43.3,1680.3 59.0,1680.0 58.0,1637.0 44.2,1636.6 59.7,917.6 69.0,121.3 69.4,89.5 1356.8,89.2 1407.3,105.4 1390.5,2075.6 1376.5,2075.4 1288.0,2073.2 577.0,2060.7 539.6,2085.4 391.6,2081.2 367.5,2055.6 145.4,2048.4 35.7,2031.5 43.3,1680.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1071.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6812044884543,41.7810732110759]}},{"type":"Feature","properties":{"resourceCoords":[567.0,2065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6823533350174,41.779203089400404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p38","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0038","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1389.0,1740.0 1392.3,1740.1 1391.8,2056.9 1180.3,2057.0 1095.8,2040.7 352.6,2031.8 247.3,2045.9 55.9,2045.7 42.4,66.2 182.1,107.1 552.8,26.1 1327.0,20.9 1394.8,48.0 1392.3,1695.7 1388.0,1696.0 1389.0,1740.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68057094825834,41.78296992096801]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6769849033886,41.78302597653797]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6768754969049,41.77914599820804]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68046154177463,41.77908994263807]}},{"type":"Feature","properties":{"resourceCoords":[1180.0,2057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6775715,41.7792611]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p39","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0039","type":"ImageService3","width":1461,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.6,2084.6 268.7,2023.9 199.5,1755.2 166.7,351.1 230.7,107.3 231.1,83.4 1227.0,81.0 1227.0,2082.0 267.6,2084.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1227.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7202416,41.7759648]}},{"type":"Feature","properties":{"resourceCoords":[1227.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7203108,41.7786952]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p4","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0004","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.3,93.0 310.7,42.0 865.0,30.9 1320.6,85.2 1346.5,83.2 1320.6,295.9 1319.0,541.5 1319.0,1552.6 1320.2,2055.0 225.9,2057.8 226.0,82.1 242.3,93.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[226.0,1049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7155471,41.7842422]}},{"type":"Feature","properties":{"resourceCoords":[226.0,41.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7155973,41.7860581]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0040","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"236.4,2073.5 238.7,70.3 1246.0,69.0 1244.5,2072.2 236.4,2073.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[237.0,1575.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7202416,41.7759648]}},{"type":"Feature","properties":{"resourceCoords":[1246.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7178599,41.7787343]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p41","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0041","type":"ImageService3","width":1461,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"212.3,2056.8 231.4,81.9 1078.8,88.4 1226.0,88.0 1206.3,2064.3 212.3,2056.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[217.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7177889,41.7759953]}},{"type":"Feature","properties":{"resourceCoords":[1226.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7154052,41.7787762]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p42","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0042","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"186.7,66.0 1102.7,70.0 1145.2,56.4 1254.4,56.4 1283.8,70.2 1290.3,127.7 1266.9,2080.3 167.2,2072.4 186.7,66.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[172.0,1576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7153354,41.7760386]}},{"type":"Feature","properties":{"resourceCoords":[1285.0,582.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7126997,41.7778983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p43","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"21"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0043","type":"ImageService3","width":1461,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"260.9,2072.1 272.9,128.9 266.1,71.8 1012.4,75.3 1216.4,74.3 1210.9,2073.5 260.9,2072.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[264.0,1576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7126592,41.7760855]}},{"type":"Feature","properties":{"resourceCoords":[1215.0,582.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7103917,41.7779361]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p44","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0044","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"656.8,65.0 1241.1,69.6 1240.5,574.2 1233.0,2070.4 238.7,2068.3 245.4,63.4 656.8,65.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.0,1072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7103672,41.7770287]}},{"type":"Feature","properties":{"resourceCoords":[1238.0,1072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7079411,41.7770713]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p45","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0045","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.8,2069.9 245.2,581.5 243.7,79.5 1084.8,76.1 1121.1,91.2 1211.6,91.5 1235.0,75.5 1235.0,2068.0 243.8,2069.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1235.0,583.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7055397,41.7780081]}},{"type":"Feature","properties":{"resourceCoords":[1235.0,2068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705469,41.7752963]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0046","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"231.0,2069.0 230.0,74.0 976.6,70.1 1221.2,70.6 1222.7,575.1 1221.3,1319.6 1218.5,2066.4 231.0,2069.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[231.0,2069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705469,41.7752963]}},{"type":"Feature","properties":{"resourceCoords":[230.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7055639,41.7789348]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p47","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0047","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.0,2064.0 228.8,1315.7 231.2,569.6 230.5,64.2 1232.3,65.3 1227.7,2065.2 225.0,2064.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1230.0,1069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7006505,41.7771833]}},{"type":"Feature","properties":{"resourceCoords":[225.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.703054,41.7753351]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p48","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0048","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.9,2068.6 231.0,78.0 1219.0,78.0 1222.0,2068.6 228.9,2068.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[230.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7006505,41.7771833]}},{"type":"Feature","properties":{"resourceCoords":[726.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.699481,41.7790273]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p49","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0049","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"236.9,2061.7 231.1,81.7 604.2,81.2 1221.7,77.9 1226.8,2060.3 236.9,2061.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[727.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6969636,41.7754219]}},{"type":"Feature","properties":{"resourceCoords":[727.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6970498,41.779062]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p5","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0005","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"254.5,2051.7 253.7,1556.8 254.4,560.9 256.1,318.9 281.8,109.4 810.9,67.2 854.5,67.2 1202.2,122.5 1203.8,2052.2 254.5,2051.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[254.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7129065,41.7842842]}},{"type":"Feature","properties":{"resourceCoords":[1203.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7105789,41.7843212]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p50","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0050","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1174.8,2055.0 231.0,2055.0 228.8,69.6 1217.7,69.5 1217.7,2064.0 1174.8,2055.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[727.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6945108,41.7754569]}},{"type":"Feature","properties":{"resourceCoords":[231.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6957316,41.7754395]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p51","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0051","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"718.1,80.1 796.5,92.9 819.5,80.3 1216.9,80.8 1218.0,1116.3 1207.7,1116.3 1210.8,2102.9 1152.0,2102.0 1112.5,2104.2 467.7,2101.3 259.3,2102.5 216.4,2093.5 217.0,80.0 718.1,80.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[719.0,1115.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6921236,41.7772544]}},{"type":"Feature","properties":{"resourceCoords":[217.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6933965,41.7791185]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0052","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.6,1106.7 231.0,79.3 608.1,77.6 623.4,56.6 709.0,57.9 725.3,78.1 1219.8,76.9 1222.7,1039.5 1226.6,2074.7 1185.8,2087.9 240.8,2087.1 231.9,2087.1 225.4,1106.7 235.6,1106.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[727.0,1111.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68969913110936,41.77727604029143]}},{"type":"Feature","properties":{"resourceCoords":[727.0,2082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6896609460058,41.775496394216496]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p53","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0053","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"211.3,1050.2 217.5,77.3 1225.3,78.7 1214.7,2087.6 251.7,2077.5 205.5,2096.4 211.3,1050.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,1083.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6860293,41.7774085]}},{"type":"Feature","properties":{"resourceCoords":[719.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6873093,41.7792076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p54","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0054","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1157.2,2071.8 724.2,2066.6 233.0,2067.0 233.2,77.8 1083.0,81.0 1216.8,98.0 1219.2,336.4 1221.0,1083.6 1228.6,2082.2 1157.2,2071.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[233.0,2067.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859803,41.7755869]}},{"type":"Feature","properties":{"resourceCoords":[729.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6848608,41.7792438]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0055","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"78.2,1034.0 82.8,290.9 82.5,53.8 191.8,69.8 413.0,75.2 437.3,100.5 584.6,103.6 621.7,78.7 1329.9,85.8 1388.2,86.8 1384.2,1062.6 1391.1,1062.7 1370.2,2050.0 1359.1,2050.0 1153.5,2048.5 572.6,2036.2 149.6,2033.1 77.0,2027.2 78.2,1034.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[71.0,1052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6836192273322,41.77739070245095]}},{"type":"Feature","properties":{"resourceCoords":[1117.0,2042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68096661672983,41.77562385230829]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p56","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0056","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"38.3,2042.8 46.4,1060.0 39.5,1060.0 30.9,88.9 60.6,89.0 263.7,88.2 367.6,73.7 1102.0,78.8 1185.6,94.5 1420.9,93.2 1413.1,621.0 1385.0,621.0 1383.0,639.0 1388.0,673.0 1412.3,672.5 1406.7,1056.5 1419.5,1056.4 1425.2,2039.3 1234.0,2039.5 1118.8,2048.5 516.7,2049.5 477.2,2040.6 227.8,2040.0 38.3,2042.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1189.0,1057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6775251,41.7774804]}},{"type":"Feature","properties":{"resourceCoords":[272.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6798001,41.7774478]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p57","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0057","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"114.8,2062.2 99.9,2062.2 97.8,1062.6 84.7,1062.5 102.7,83.0 210.3,82.8 821.1,80.2 1369.5,79.2 1368.5,117.6 1331.7,142.0 1391.2,513.9 1346.2,2065.2 114.8,2062.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[864.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.675084,41.7775129]}},{"type":"Feature","properties":{"resourceCoords":[864.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6750364,41.7756938]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p58","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0058","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.3,69.8 1329.4,68.8 1395.9,1857.3 1361.4,2055.4 1354.3,2055.4 115.5,2052.1 95.7,2052.0 77.3,1321.7 41.1,1321.6 40.2,1299.5 76.7,1297.4 70.7,1058.0 98.8,1058.0 72.0,69.8 106.3,69.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[859.0,1059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6749758,41.773881]}},{"type":"Feature","properties":{"resourceCoords":[859.0,2054.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.674936,41.7720585]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0059","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"99.1,1495.2 205.0,1065.0 170.3,587.0 99.5,406.6 150.1,124.2 263.6,45.9 1227.1,45.2 1223.0,2052.9 217.4,2050.3 217.7,2020.4 177.1,2015.2 99.1,1495.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[214.0,1050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.72262520921659,41.77320416763095]}},{"type":"Feature","properties":{"resourceCoords":[1206.0,1552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.72019346250502,41.77233353840759]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p6","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0006","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"252.6,2059.3 250.6,117.2 263.1,119.2 353.6,54.2 628.2,52.6 722.9,61.5 837.9,61.5 1240.0,78.3 1244.4,115.4 1247.1,2059.4 252.6,2059.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[251.0,562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7106058,41.7852274]}},{"type":"Feature","properties":{"resourceCoords":[1245.0,562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7081834,41.7852655]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0060","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1227.3,60.4 1234.2,2056.3 229.5,2058.8 223.5,65.9 1227.3,60.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[205.0,558.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.72024482661534,41.77416266955535]}},{"type":"Feature","properties":{"resourceCoords":[1234.0,1555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.71769136770564,41.772375259781576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p61","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0061","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1220.5,48.3 1211.8,2054.4 205.0,2049.4 213.0,46.5 1220.5,48.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[209.0,1048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7177186,41.7732803]}},{"type":"Feature","properties":{"resourceCoords":[1214.0,1551.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7152429,41.7724094]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p62","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0062","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.7,51.1 1308.5,38.8 1321.3,2039.2 1296.7,2054.4 1171.2,2055.4 1144.3,2040.6 761.9,2043.9 233.0,2048.0 215.7,51.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[220.0,552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7152892,41.7742246]}},{"type":"Feature","properties":{"resourceCoords":[233.0,2048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7152196,41.7714951]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0063","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"258.1,49.0 1213.3,60.8 1187.3,2010.3 1121.9,1998.0 888.8,2064.2 465.0,2042.5 465.9,2051.0 255.1,2049.2 224.6,2048.9 258.1,49.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0063/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7132697981486,41.7752551035513]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70974340287476,41.775344158341504]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.709569788573,41.77146626316709]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71309618384684,41.77137720837689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p64","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0064","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.9,63.2 1229.0,60.2 1229.0,2008.7 1130.1,2055.8 563.0,2060.1 246.2,2005.3 242.9,63.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1229.0,554.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7078737,41.774353]}},{"type":"Feature","properties":{"resourceCoords":[1229.0,2050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7078058,41.7716125]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p65","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0065","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.2,53.7 1222.1,53.9 1217.9,2009.2 1212.8,2004.9 719.7,2083.6 237.3,2013.6 217.2,2023.2 223.2,53.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,1052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7054218,41.7734875]}},{"type":"Feature","properties":{"resourceCoords":[217.0,2065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7078058,41.7716125]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p66","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0066","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.0,59.0 1217.7,56.3 1212.7,1997.0 1202.7,1995.6 736.6,2068.0 294.6,2044.9 234.3,1996.2 233.0,59.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[234.0,1544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7053982,41.7725801]}},{"type":"Feature","properties":{"resourceCoords":[233.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705469,41.7752963]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p67","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0067","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.8,60.4 1225.7,61.9 1220.6,2002.8 730.2,2081.1 217.1,2005.3 225.8,60.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[728.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7017743,41.7735259]}},{"type":"Feature","properties":{"resourceCoords":[728.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7017238,41.7717007]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p68","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0068","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1229.4,80.5 1234.4,1991.0 1224.2,1988.5 1128.2,2045.2 646.5,2058.2 462.2,2058.6 245.8,2000.3 245.8,81.5 1229.4,80.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1232.0,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6981213,41.7735815]}},{"type":"Feature","properties":{"resourceCoords":[741.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6993809,41.7753875]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p69","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0069","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.0,67.0 1210.2,66.2 1213.8,2002.2 842.2,2064.0 495.5,2065.0 219.4,1996.0 215.0,67.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1212.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6956823,41.7736186]}},{"type":"Feature","properties":{"resourceCoords":[215.0,67.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6981718,41.7754047]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p7","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0007","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.0,2059.0 240.6,120.6 236.6,83.7 1239.2,133.2 1240.2,142.1 1225.5,2066.6 229.0,2059.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[229.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7081013,41.7825445]}},{"type":"Feature","properties":{"resourceCoords":[1233.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7057861,41.7862135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p70","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0070","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"958.1,2047.1 260.9,1981.0 233.0,1985.6 233.6,63.1 1174.4,64.5 1217.1,73.5 1214.7,2046.9 958.1,2047.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[728.0,1052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6944608,41.7736372]}},{"type":"Feature","properties":{"resourceCoords":[728.0,2046.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6944104,41.7718068]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p71","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0071","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"251.4,76.7 460.2,75.7 1106.2,79.0 1204.6,77.9 1213.6,79.5 1211.8,2068.0 206.8,2069.7 208.5,67.6 251.4,76.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[713.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6920255,41.7736566]}},{"type":"Feature","properties":{"resourceCoords":[713.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6920743,41.7754591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p72","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0072","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1185.6,90.8 1226.5,77.8 1226.2,1021.6 1224.9,2056.7 235.2,2057.5 239.1,85.0 1185.6,90.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[735.0,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6895877,41.7736934]}},{"type":"Feature","properties":{"resourceCoords":[735.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6896388,41.7754866]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p73","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0073","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1162.5,2061.1 203.7,2063.0 203.8,1023.9 203.0,76.2 248.8,57.2 1207.0,62.2 1207.0,2061.0 1162.5,2061.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1207.0,1059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859314,41.77377]}},{"type":"Feature","properties":{"resourceCoords":[1207.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6858822,41.7719437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p74","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0074","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"734.6,2055.4 235.1,2054.2 233.0,63.0 724.7,62.0 1158.0,66.8 1229.5,77.1 1228.0,1222.7 1268.2,1225.4 1266.0,1269.2 1227.9,1268.4 1226.5,2048.4 734.6,2055.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[733.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6847072,41.7737874]}},{"type":"Feature","properties":{"resourceCoords":[233.0,63.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6859803,41.7755869]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0075","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"35.6,1260.3 74.0,1261.0 76.0,1217.0 35.6,1214.3 33.1,62.2 106.7,67.2 534.8,64.6 1122.9,69.3 1326.3,68.0 1336.2,1061.6 1316.3,1061.6 1346.8,2059.1 1121.0,2059.2 588.8,2059.4 337.5,2048.2 37.0,2044.9 35.6,1260.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[574.0,2072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6821389531569,41.77195465960675]}},{"type":"Feature","properties":{"resourceCoords":[1081.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68097818553936,41.77560579334697]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0076","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"22.6,1067.0 42.4,1066.9 30.8,84.7 35.4,84.7 237.0,81.3 487.8,81.4 527.5,90.2 1133.0,87.9 1248.7,78.5 1421.6,78.0 1450.7,1061.5 1422.8,1061.5 1429.3,1299.8 1393.0,1302.0 1394.0,1324.0 1430.0,1324.0 1450.2,2050.8 1270.1,2050.8 244.2,2052.6 54.6,2053.0 22.6,1067.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1207.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67744433090134,41.77385673427311]}},{"type":"Feature","properties":{"resourceCoords":[284.0,1067.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67972170638345,41.77382048861163]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.66"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0077","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"209.7,2089.2 123.8,2060.6 155.7,1734.6 84.7,1538.3 136.6,1240.0 69.8,519.7 146.4,124.6 109.9,71.4 178.0,31.9 219.1,37.1 218.8,67.2 1235.7,71.4 1226.7,2093.6 209.7,2089.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0077/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72309459315484,41.77150684412244]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7195972057562,41.77156549315286]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71948334594865,41.76773508013534]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72298073334728,41.76767643110492]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0078","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1212.5,2065.6 250.8,2072.2 239.2,67.9 1246.4,61.5 1260.6,2024.4 1258.3,2062.4 1212.5,2065.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1273.0,1588.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.71756222375295,41.76868673045303]}},{"type":"Feature","properties":{"resourceCoords":[1273.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.71760655542049,41.77144847340551]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p79","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0079","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"276.4,2066.8 235.0,2064.0 237.3,2026.1 226.3,71.3 1228.0,66.5 1229.8,522.1 1230.0,568.0 1231.7,1020.8 1231.9,1066.1 1232.8,1318.7 1234.7,1817.1 1235.8,2061.8 276.4,2066.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1230.0,568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7151982,41.7705797]}},{"type":"Feature","properties":{"resourceCoords":[235.0,2064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7175841,41.7678239]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0008","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.0,121.5 241.9,112.6 397.5,117.8 1069.6,51.6 1237.1,97.6 1256.0,2052.9 259.3,2061.2 243.0,121.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[252.0,2044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705684005272,41.782613433325686]}},{"type":"Feature","properties":{"resourceCoords":[749.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.70453894426869,41.78623235926256]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0080__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 | 1951 | sanborn01790_111 p80 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5840.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0080__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0080","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.0,2067.0 943.0,2067.0 919.3,2011.2 966.8,1395.3 1005.2,1385.6 1005.0,1362.7 1097.6,1362.1 1291.2,1312.9 1400.1,962.5 1358.2,836.9 1405.2,668.9 1335.4,462.1 1403.9,323.9 1372.6,82.1 1134.6,84.0 1110.0,98.9 985.5,99.0 958.9,84.1 54.0,85.0 54.0,2067.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0080__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[54.0,1078.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.715177,41.7696703]}},{"type":"Feature","properties":{"resourceCoords":[54.0,85.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7152196,41.7714951]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p81","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0081","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"204.1,1958.6 91.3,1697.3 166.0,1321.6 92.1,632.1 126.0,85.4 291.9,76.5 1292.3,76.2 1287.7,2069.7 286.2,2067.1 286.2,2057.3 194.9,2051.6 204.1,1958.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[289.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.693163,41.7700044]}},{"type":"Feature","properties":{"resourceCoords":[1290.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6907155,41.7700437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p82","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0082","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1219.4,71.5 1220.0,2066.7 226.3,2066.0 227.0,74.0 1219.4,71.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[726.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6894937,41.7700634]}},{"type":"Feature","properties":{"resourceCoords":[227.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6907625,41.7718633]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p83","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0083","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.2,2076.2 219.2,68.3 1182.8,67.7 1220.4,67.6 1214.1,1072.0 1220.0,1072.0 1218.7,2078.6 258.0,2076.2 216.2,2076.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0083/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,1072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6858485,41.770122]}},{"type":"Feature","properties":{"resourceCoords":[721.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.687114,41.7719234]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0084","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"230.8,2067.1 225.4,1071.7 219.7,1071.7 219.2,78.4 226.3,78.4 724.8,77.5 1215.6,68.4 1218.0,359.1 1219.3,1025.2 1223.9,1768.5 1224.1,2062.9 230.8,2067.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[725.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68462019024759,41.77013849162603]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,2054.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68332072070869,41.76834762583721]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p85","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0085","type":"ImageService3","width":1458,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"111.9,1774.4 110.2,1030.4 111.3,363.9 110.0,72.9 408.3,77.0 657.8,88.9 1186.1,90.1 1364.4,90.5 1394.0,1080.0 1389.0,1080.0 1385.5,1080.0 1378.0,2069.1 1218.5,2069.2 196.8,2070.1 111.0,2069.0 111.9,1774.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[111.0,2069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6833571,41.7683309]}},{"type":"Feature","properties":{"resourceCoords":[1148.0,90.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6808988,41.7719924]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0086","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1348.0,1456.8 1356.8,1487.7 1349.6,1596.5 1358.8,1613.5 1396.0,1615.5 1374.4,1643.5 1350.2,1657.2 1350.9,2014.8 1350.5,2056.7 1252.2,2057.7 1210.9,2074.5 622.5,2079.2 587.9,2063.3 315.5,2066.8 98.0,2069.7 93.2,1079.5 96.7,1079.4 101.8,1079.3 59.9,89.2 296.5,86.8 1327.9,77.1 1338.4,683.4 1345.2,900.9 1342.5,1013.9 1345.0,1221.7 1346.2,1316.1 1346.4,1330.1 1347.1,1387.6 1348.0,1456.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[350.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67964027122767,41.77019362091264]}},{"type":"Feature","properties":{"resourceCoords":[1357.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67716857704909,41.77020485078264]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p87","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0087","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.0,1432.0 19.0,1410.0 13.0,1403.0 11.0,1394.4 19.0,1394.0 19.0,1370.0 11.1,1370.8 11.2,1363.2 19.0,1364.0 17.0,1338.0 11.2,1337.3 11.3,1325.4 18.0,1325.0 16.0,1269.0 11.5,1268.7 11.7,1229.6 17.0,1229.0 17.0,1209.0 11.7,1208.4 11.9,1165.2 14.0,1165.0 14.0,1143.0 12.0,1142.8 12.2,1094.1 14.0,1094.0 14.0,1074.0 12.2,1073.6 12.4,1023.2 14.0,1005.0 13.2,1005.0 13.6,995.0 14.0,995.0 15.0,963.0 15.1,959.2 16.0,959.0 16.0,935.6 16.4,927.3 17.0,927.0 17.0,911.0 16.8,898.0 17.0,878.0 16.5,877.6 15.9,838.0 16.0,814.0 15.5,814.0 14.8,768.1 16.0,768.0 16.0,746.0 14.5,745.6 14.4,740.3 17.0,740.0 17.0,695.0 13.7,694.8 13.7,680.2 18.0,680.0 18.0,629.0 13.7,628.8 13.6,620.1 15.0,620.0 15.0,576.0 13.6,575.9 13.0,92.4 212.5,94.2 1444.0,104.9 1443.9,144.7 1344.5,695.8 1431.8,1049.2 1352.4,1655.2 1421.6,2068.4 372.9,2061.6 11.0,2059.1 11.0,2050.0 9.6,2049.9 8.3,2041.2 10.0,2041.0 10.0,2024.0 5.6,2023.5 4.7,2017.5 5.0,1999.5 11.0,1999.0 10.0,1952.0 5.6,1951.6 9.8,1662.3 33.0,1663.0 34.0,1649.0 61.0,1649.0 62.0,1622.0 19.0,1619.0 16.0,1602.0 10.2,1602.0 13.7,1559.2 18.0,1559.0 18.0,1524.0 16.9,1520.3 19.0,1494.0 19.0,1464.0 10.8,1463.1 19.0,1432.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[461.0,1083.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67609386160531,41.77022838141877]}},{"type":"Feature","properties":{"resourceCoords":[461.0,1579.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.676066562663,41.76931457725857]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0088","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"371.4,105.0 1416.5,95.9 1425.5,145.4 1444.8,1560.7 1432.5,1673.4 1393.0,1677.0 1394.0,1725.0 1427.0,1724.4 1390.2,2063.7 104.9,2087.1 40.6,2088.2 27.9,2072.2 27.8,1826.2 17.4,1089.8 15.9,844.9 3.5,108.2 371.4,105.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[463.0,2076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67599620324624,41.76477824109412]}},{"type":"Feature","properties":{"resourceCoords":[1410.0,91.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.67368285889039,41.76846137115207]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p89","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0089","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1077.8,2010.2 293.3,2063.8 189.5,2024.8 113.8,1650.4 163.9,1337.9 99.8,292.3 124.8,21.4 209.9,49.5 1216.5,48.4 1217.7,2022.0 1077.8,2010.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[210.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7224166,41.7650092]}},{"type":"Feature","properties":{"resourceCoords":[210.0,559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7224584,41.7668299]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p9","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0009","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.6,116.2 609.4,43.6 1155.8,62.2 1213.8,115.2 1230.5,112.2 1231.6,2052.8 230.6,2053.1 227.6,116.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[730.0,2053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7020262,41.782639]}},{"type":"Feature","properties":{"resourceCoords":[730.0,63.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7021266,41.7862715]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p90","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0090","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.0,54.6 1197.3,53.6 1243.0,50.6 1245.6,101.8 1248.3,1989.3 1186.2,2061.9 971.5,2072.9 239.0,2010.2 239.0,54.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1247.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7175305,41.7659896]}},{"type":"Feature","properties":{"resourceCoords":[239.0,1556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7199747,41.7650446]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p91","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0091","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1074.3,2013.3 676.4,2073.1 215.1,2012.0 214.9,100.8 212.3,49.0 254.2,52.0 1226.2,52.4 1222.8,2016.2 1074.3,2013.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[215.0,1067.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7175305,41.7659896]}},{"type":"Feature","properties":{"resourceCoords":[215.0,1571.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7175072,41.7650814]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p92","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0092","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1129.5,73.0 1134.0,83.7 1324.1,138.4 1379.3,337.6 1330.3,623.2 1400.0,1682.0 1320.7,2018.5 834.8,2083.5 386.7,2083.1 270.6,2000.2 240.0,1999.7 240.0,73.0 1129.5,73.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[240.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7150494,41.7642069]}},{"type":"Feature","properties":{"resourceCoords":[240.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7151345,41.7678528]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p93","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0093","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"934.3,2058.3 819.3,2005.3 287.5,2059.4 272.1,2059.5 184.6,1653.7 205.5,960.9 112.6,435.6 149.8,49.9 240.9,55.4 240.9,65.2 1239.3,65.9 1238.7,2025.8 934.3,2058.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[737.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6918529,41.7663911]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6906216,41.7664091]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p94","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0094","type":"ImageService3","width":1470,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.5,64.7 1224.5,68.3 1225.8,68.3 1219.3,1059.4 1221.8,1059.4 1219.4,2005.0 1208.7,2000.4 456.8,2064.4 266.5,2016.0 229.1,2020.0 235.5,64.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[729.0,1058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6894003,41.7664269]}},{"type":"Feature","properties":{"resourceCoords":[229.0,2052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6905744,41.7645836]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p95","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0095","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1151.8,1993.2 1091.5,2051.1 316.4,2050.7 217.3,2008.8 217.0,1060.0 214.5,1060.0 218.0,65.6 258.2,65.6 1211.5,66.2 1213.1,311.6 1215.1,2007.2 1151.8,1993.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[217.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6881886,41.7664447]}},{"type":"Feature","properties":{"resourceCoords":[1214.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6857456,41.7664804]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p96","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0096","type":"ImageService3","width":1470,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1281.1,2034.0 615.9,2066.8 517.3,2068.1 298.9,2022.2 280.6,317.7 276.6,71.1 1278.5,62.2 1281.4,343.9 1302.7,2035.6 1281.1,2034.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[291.0,1067.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68574002657465,41.766485970557625]}},{"type":"Feature","properties":{"resourceCoords":[789.0,2060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.68450180991462,41.764689403619705]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p97","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0097","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"754.2,2085.9 80.8,2034.9 64.0,365.9 61.9,88.2 147.2,88.8 1163.1,81.9 1295.9,81.0 1373.0,1064.8 1332.4,1064.9 1317.2,2049.7 1218.8,2050.4 1218.6,2080.0 754.2,2085.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1095.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6807738,41.7665543]}},{"type":"Feature","properties":{"resourceCoords":[81.0,2056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6832488,41.7647043]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_111 p98","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:42:05Z","modified":"2026-10-17T02:42:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0098","type":"ImageService3","width":1470,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"31.4,2108.6 32.0,2102.0 89.0,2104.0 95.8,2107.4 1404.0,2084.4 1391.0,2068.0 1391.1,1815.7 1380.8,1060.5 1379.5,809.3 1367.2,53.6 1267.4,54.5 1225.4,71.6 628.0,75.4 592.9,59.1 316.3,62.3 69.1,65.2 152.8,1070.5 111.2,1070.8 100.6,2077.6 1.0,2078.8 1.0,2109.1 31.4,2108.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195124:01790_24_1951-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[376.0,1069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6795472,41.7665669]}},{"type":"Feature","properties":{"resourceCoords":[1391.0,2068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.677075,41.7647796]}}]}}]}