{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01804_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Cook County, Illinois | 1950 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"101"},{"label":"placed","value":"85"},{"label":"unplaced","value":"16"},{"label":"fit sources","value":"georef 45, georef-snap 39, snap:2 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"10 sheet(s) cut into 21 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 42.09954,-87.73066 +/-6012m); p1 (tier 1, 42.07606,-87.70948 +/-268m); p105__2 (tier 2, 42.09319,-87.71258 +/-672m); p112__2 (tier 2, 42.09633,-87.72464 +/-100m); p122__1 (tier 2, 42.10662,-87.72348 +/-782m); p122__2 (tier 1, 42.10138,-87.72159 +/-128m); p129__1 (tier 1, 42.10959,-87.74523 +/-140m); p129__2 (tier 2, 42.11171,-87.73414 +/-412m); p134 (tier 2, 42.12671,-87.75395 +/-2186m); p153 (tier 2, 42.13395,-87.75919 +/-208m); p154__2 (tier 1, 42.09406,-87.71606 +/-181m); p161__1 (tier 2, 42.13997,-87.77396 +/-100m); p161__3 (tier 2, 42.13997,-87.77396 +/-100m); p31 (tier 2, 42.09514,-87.71373 +/-4205m); p35__1 (tier 2, 42.09753,-87.73258 +/-4313m); p35__2 (tier 2, 42.09753,-87.73258 +/-4313m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p10","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0010","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"82.9,69.9 142.1,67.4 219.0,19.6 274.8,19.5 489.6,353.2 832.5,136.7 772.8,44.8 969.2,50.4 1049.1,0.0 1253.9,0.0 1285.2,48.3 1356.8,47.8 1359.9,163.4 1392.2,213.3 1070.9,511.8 1323.4,903.7 1211.6,1009.7 1271.0,1100.3 1278.2,2126.0 -0.0,2126.0 -0.0,377.0 82.9,377.3 82.9,69.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[486.0,1281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7125547,42.071498]}},{"type":"Feature","properties":{"resourceCoords":[886.0,1957.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7106326,42.0690226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0101","type":"ImageService3","width":1446,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 139.9,0.0 186.1,37.1 416.4,100.6 1097.9,1002.9 1124.0,983.5 1220.2,1294.4 11.8,1301.3 11.9,1332.6 -0.0,1329.3 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72685853906822,42.09236705872013]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72004874243143,42.09372129813796]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7173844996304,42.08623881534524]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72419429626719,42.08488457592741]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0102","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"468.1,1733.3 424.5,1882.5 83.0,1785.5 133.0,1606.5 135.7,70.3 -0.0,31.5 0.0,-0.0 1217.8,0.0 1456.8,796.5 1462.0,1238.0 1302.7,1191.8 1166.9,1642.6 1201.3,1681.6 1389.4,1734.2 1318.5,1988.1 468.1,1733.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0102/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72517235731245,42.08779793824044]}},{"type":"Feature","properties":{"resourceCoords":[1462.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71835065138275,42.089185990256475]}},{"type":"Feature","properties":{"resourceCoords":[1462.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71564996452634,42.081771927130895]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72247167045603,42.08038387511486]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p103 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"18"},{"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":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"469.6,357.9 479.9,374.0 432.0,539.8 414.4,539.9 169.8,1346.1 -0.0,1607.8 -0.0,1676.0 50.0,1734.4 -0.0,1911.1 -0.0,2126.0 217.8,2126.0 237.3,2062.3 307.7,2034.4 504.4,2051.3 1269.2,2018.9 1229.4,387.0 1395.4,234.3 1197.5,0.0 578.2,0.0 469.6,357.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[313.0,1515.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7162971,42.0863904]}},{"type":"Feature","properties":{"resourceCoords":[633.0,2039.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7133829,42.0860168]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p103 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1919.6"},{"label":"split_canvas_h","value":"2604.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"467.8,415.9 473.1,397.4 177.6,-0.0 3.4,-0.0 -0.0,651.0 21.3,638.8 57.5,535.5 189.1,542.4 191.6,541.0 307.1,540.4 467.8,415.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0103__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[484.9,403.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7194527,42.0935595]}},{"type":"Feature","properties":{"resourceCoords":[196.9,26.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7238676,42.0936108]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p104 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5474.0"},{"label":"split_canvas_w","value":"5848.0"},{"label":"split_canvas_h","value":"3030.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"201.9,1887.0 383.5,2126.0 1047.0,2126.0 1045.5,1497.1 463.6,1501.7 230.0,1480.3 184.4,1516.3 148.7,1633.0 258.6,1785.2 201.9,1887.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[918.0,1493.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7124055,42.0868995]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,1493.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7114369,42.0877749]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p104 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5848.0"},{"label":"split_canvas_h","value":"5474.4"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1390.0,1247.6 1462.0,1247.5 1462.0,0.0 298.4,0.0 -0.0,388.4 -0.0,930.3 183.3,1071.5 96.8,1187.6 -0.0,1201.8 0.0,1368.5 1392.6,1368.6 1390.0,1247.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0104__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[340.0,864.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7078632,42.0878243]}},{"type":"Feature","properties":{"resourceCoords":[1096.0,363.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7041252,42.0895424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0105__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p105 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5824.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0105__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0105","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"207.1,1940.9 1292.3,1953.8 1297.8,678.7 1118.8,684.1 1120.4,12.8 1456.0,13.7 1456.0,-0.0 575.5,0.0 541.8,0.0 537.5,512.4 778.0,783.4 -0.0,1474.1 -0.0,1679.0 207.1,1940.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0105__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1298.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7104112,42.0917096]}},{"type":"Feature","properties":{"resourceCoords":[346.0,1297.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.714987,42.0930369]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p106","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0106","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"176.0,1933.8 178.4,663.1 -0.0,669.0 -0.0,-0.0 1462.0,-0.0 1462.0,236.8 700.8,820.5 700.4,1302.2 1024.7,1725.2 1256.7,1725.8 1251.7,1879.5 1187.2,1937.2 1287.0,2067.3 1308.5,2050.9 1308.3,2126.0 701.6,2126.0 698.5,1939.4 176.0,1933.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[700.0,1601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7103752,42.0887305]}},{"type":"Feature","properties":{"resourceCoords":[700.0,977.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7084281,42.0904991]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p107","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0107","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2077.4 -0.0,67.3 1251.8,65.8 1229.1,334.6 1126.7,614.5 1136.2,1084.8 1219.6,1081.7 1301.9,1070.2 1311.6,1365.3 1303.3,1400.1 1276.9,1416.7 1135.6,1394.3 1140.9,1692.3 1166.3,1716.8 1139.7,1739.9 1146.4,2075.3 -0.0,2077.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0107/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74840176861147,42.101419536269425]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74136593081654,42.101321754506124]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74155700440625,42.09364501523161]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74859284220118,42.09374279699491]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p108","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0108","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2077.0 -0.0,1742.1 23.6,1719.5 -0.0,1695.0 -0.0,1398.8 137.0,1421.1 163.6,1404.9 172.2,1370.2 165.5,1075.7 -0.0,1088.5 -0.0,610.5 100.5,340.8 125.9,72.7 1464.0,85.0 1464.0,1590.2 1464.0,1592.5 1464.0,2052.0 1394.8,2083.1 -0.0,2077.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0108/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74296567022164,42.10136492549099]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7358759529997,42.101321327379154]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73596068138468,42.09362803862729]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74305039860661,42.093671636739124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0109","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"463.1,70.2 1256.0,74.7 1247.0,1864.4 469.1,1854.7 463.1,70.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0109/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73812765125075,42.10128842929774]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73104586349328,42.10122679758218]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73116629635375,42.09349988618541]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73824808411122,42.09356151790097]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p110","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0110","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"184.8,2126.0 168.4,63.0 673.9,50.1 698.1,86.1 812.0,83.8 810.3,0.0 860.7,57.2 999.4,55.8 1020.0,1419.3 1180.8,1416.8 1345.2,2126.0 184.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0110/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73282862805156,42.10120748421648]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7257500941488,42.1010675346987]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72602207068954,42.093386359976286]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73310060459231,42.09352630949407]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p111","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"40"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0111","type":"ImageService3","width":1456,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1456.0,1633.3 1456.0,2126.0 89.5,2126.0 91.0,1831.0 -0.0,1497.6 -0.0,0.0 1340.5,-0.0 1456.0,1633.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[623.0,542.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7203379,42.0989217]}},{"type":"Feature","properties":{"resourceCoords":[91.0,1831.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7265701,42.1008929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0112__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p112 [1]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"20"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5856.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0112__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0112","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1777.8 148.2,1780.7 262.5,1732.6 261.0,2063.2 970.4,1914.3 966.2,2126.0 1053.6,2126.0 1055.7,1904.8 1227.5,1866.9 1217.8,1831.4 1241.5,1777.3 1242.0,1539.1 1169.0,1622.5 906.8,1418.8 927.0,453.6 1367.4,454.1 1252.0,354.4 1255.4,52.3 1135.7,50.8 1072.3,-0.0 978.9,-0.0 981.4,50.2 308.6,45.0 182.8,65.8 155.2,93.1 147.4,1002.5 112.6,1034.1 113.6,1601.0 -0.0,1673.3 -0.0,1777.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0112__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1241.0,1624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7251863,42.0924086]}},{"type":"Feature","properties":{"resourceCoords":[412.0,924.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7217361,42.0953995]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p113","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0113","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"617.0,98.7 616.7,51.6 1261.9,59.0 1252.6,2126.0 -0.0,2126.0 -0.0,94.3 617.0,98.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[619.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7514737,42.1048241]}},{"type":"Feature","properties":{"resourceCoords":[619.0,2053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7515009,42.1012166]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p114","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0114","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1371.3,2063.5 2.4,2054.9 -0.0,61.2 1358.2,69.0 1371.3,2063.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0114/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74830895563491,42.108641234528385]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74119103336224,42.1085823827532]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74130541882424,42.10085937724081]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74842334109691,42.100918229015996]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p115","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0115","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"59.9,2062.3 52.7,52.4 1076.2,61.2 1068.4,1069.0 1408.2,1072.0 1407.2,2074.8 59.9,2062.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0115/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74196104915522,42.10852623363086]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73495556295426,42.10848373448262]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73503884768321,42.10081989466333]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74204433388418,42.100862393811575]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p116","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0116","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"363.0,2067.1 360.1,70.1 902.7,31.6 912.5,2066.9 363.0,2067.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1017.0,1403.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7352174,42.1058288]}},{"type":"Feature","properties":{"resourceCoords":[349.0,739.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7368266,42.1070575]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p117","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0117","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1117.8,2069.0 -0.0,2057.1 -0.0,33.5 126.3,0.0 1150.6,0.0 1171.6,1348.3 1452.0,1796.0 1452.0,2126.0 1204.2,2126.0 1117.8,2069.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[318.0,734.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7346775,42.1070397]}},{"type":"Feature","properties":{"resourceCoords":[107.0,1398.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7352174,42.1058288]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p118","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0118","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"469.8,1811.8 188.8,1359.5 176.6,0.0 536.9,0.0 727.5,185.1 943.7,96.0 1465.0,95.3 1465.0,2093.3 467.6,2126.0 469.8,1811.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0118/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73303015508418,42.10837136395186]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72946226705959,42.10835597398569]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.729492159672,42.10448753028287]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7330600476966,42.10450292024904]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p119","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0119","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1400.4,2044.5 70.0,2048.8 47.1,56.5 982.6,47.0 1150.5,116.3 1452.0,95.5 1452.0,138.9 1255.5,264.1 1452.0,557.9 1452.0,721.4 1382.3,721.6 1400.4,2044.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0119/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73532029796604,42.10472513270094]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73179496024729,42.10467080029206]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73190143119137,42.1008140468962]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73542676891013,42.100868379305076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p11 [1]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"11"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5848.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"377.9,1278.6 220.9,1379.8 -0.0,1059.7 -0.0,2126.0 659.0,2126.0 877.0,2126.0 1360.0,2126.0 997.3,1551.2 1000.0,1325.9 1166.5,1591.6 1173.6,1559.3 1175.2,193.1 785.4,189.3 784.7,559.8 524.0,566.7 799.8,1006.7 626.0,1118.7 618.0,1091.0 379.5,1081.7 377.9,1278.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[130.0,1580.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080742,42.0702337]}},{"type":"Feature","properties":{"resourceCoords":[1174.0,564.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029521,42.0739012]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p11 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2730.0"},{"label":"split_canvas_h","value":"2045.6"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 -0.0,511.4 682.5,510.5 675.9,0.0 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0011__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[128.1,131.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7738716,42.0809266]}},{"type":"Feature","properties":{"resourceCoords":[600.5,449.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7712603,42.0797149]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p12","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"10"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0012","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"381.9,2126.0 -0.0,1535.9 -0.0,1312.7 168.1,1573.9 174.7,1541.8 160.3,188.8 1294.0,185.2 1305.0,1132.5 1296.1,1188.8 1261.8,1241.7 1183.7,1291.9 1189.5,2088.8 1465.0,2089.5 1465.0,2126.0 381.9,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[847.0,1910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6996885,42.0689028]}},{"type":"Feature","properties":{"resourceCoords":[170.0,1079.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029614,42.0719867]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p120","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0120","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1247.0,1570.3 1465.0,1921.5 1465.0,2126.0 1240.2,2126.0 1193.8,2053.5 195.5,2059.0 195.9,738.8 265.0,739.5 267.3,576.4 76.6,280.4 398.9,80.2 1465.0,84.6 1465.0,750.9 1191.0,748.4 1247.0,1570.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[196.0,1400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.732012,42.1021621]}},{"type":"Feature","properties":{"resourceCoords":[196.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7320226,42.1009639]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p121","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0121","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"442.4,1398.7 442.1,1063.3 315.7,1061.9 313.9,55.5 711.5,58.8 675.2,0.0 1454.0,0.0 1454.0,657.7 1454.0,657.7 1454.0,1980.0 1263.2,1979.3 1263.2,2071.9 492.4,2065.2 332.4,1811.3 303.5,1397.6 442.4,1398.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0121/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73097902250322,42.108391422391705]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7239499327766,42.10835165255955]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72402776155575,42.10067255235694]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73105685128236,42.100712322189096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p123","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0123/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0123","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"171.3,1341.0 171.6,1261.2 168.5,1199.9 228.0,1171.3 218.1,962.0 166.2,955.3 134.9,951.2 56.6,963.4 104.9,834.0 95.5,755.5 154.7,775.5 207.0,727.1 196.8,510.5 172.8,471.4 33.4,539.5 -0.0,454.6 -0.0,-0.0 1454.0,0.0 1454.0,2126.0 1232.1,2126.0 1007.6,1778.3 974.5,1753.8 979.3,1996.6 992.3,2002.6 979.6,2010.7 981.9,2126.0 877.3,2126.0 854.5,2089.9 864.5,2083.6 862.8,1854.2 855.6,1843.0 856.0,1774.0 64.9,1772.9 46.4,1752.0 -0.0,1752.0 -0.0,1349.1 171.3,1341.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[856.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7349546,42.1154901]}},{"type":"Feature","properties":{"resourceCoords":[365.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7397503,42.1155747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p124","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0124","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1465.0,2126.0 316.4,2126.0 354.2,1438.1 340.5,1345.0 299.9,1315.8 304.0,1240.7 277.9,1165.9 278.6,938.5 322.4,905.3 371.1,14.3 1465.0,0.0 1465.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,90.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7195033,42.1008064]}},{"type":"Feature","properties":{"resourceCoords":[1370.0,1933.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7122653,42.0941982]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p125","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0125","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,81.1 1361.0,93.0 1364.1,2126.0 -0.0,2126.0 -0.0,81.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1361.0,1523.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7514348,42.1105006]}},{"type":"Feature","properties":{"resourceCoords":[1361.0,93.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7513449,42.1157472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p126","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"19"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0126","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"955.6,282.9 934.8,2074.5 95.6,2070.1 95.3,280.0 955.6,282.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0126/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1086.0,355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7464746,42.1146941]}},{"type":"Feature","properties":{"resourceCoords":[338.0,580.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7501767,42.1139023]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p127","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0127","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1158.3,2053.6 -0.0,2061.2 -0.0,50.8 757.7,48.5 757.2,0.0 873.3,0.0 910.5,42.0 1091.2,43.4 1386.8,503.6 1263.8,583.2 1328.7,1044.1 1148.9,1047.2 1158.3,2053.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0127/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74708563739152,42.115863011469926]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74004478365714,42.115740100327095]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74028534650478,42.10804904863084]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74732620023916,42.10817195977367]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p128","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0128","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1336.9,2052.6 97.4,2059.7 94.9,1059.4 273.6,1057.7 212.3,599.1 335.1,521.0 44.5,61.5 1450.5,72.4 1463.0,688.6 1442.8,701.1 1463.0,733.4 1463.0,2018.9 1336.9,2052.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0128/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74201813513845,42.11584065720402]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73488814351126,42.115752886649624]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7350588721134,42.108012378984796]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7421888637406,42.10810014953919]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p13","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"2"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0013","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1454.0,2126.0 117.0,2126.0 109.0,1312.3 188.7,1260.8 223.6,1206.8 232.6,1149.3 219.0,182.0 964.6,181.7 976.6,1063.1 1348.6,1057.3 1360.5,1939.5 1454.0,1939.1 1454.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[219.0,182.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6973458,42.0751922]}},{"type":"Feature","properties":{"resourceCoords":[1336.0,182.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6919505,42.0751176]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p130","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0130","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2028.2 -0.0,550.8 25.6,535.2 -0.0,522.8 -0.0,39.4 65.0,89.4 202.3,304.7 1282.3,2082.3 661.5,2075.7 524.4,2121.9 427.9,2029.2 -0.0,2028.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[549.0,874.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7311141,42.1125695]}},{"type":"Feature","properties":{"resourceCoords":[837.0,2077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7297263,42.1081857]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p131","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"25"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0131","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"310.3,2126.0 311.2,1915.5 -0.0,1915.2 -0.0,405.6 60.8,403.9 305.4,253.6 317.9,420.8 1454.0,405.6 1454.0,1408.7 1250.3,1409.4 1245.7,2126.0 310.3,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0131/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[724.0,414.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7464574,42.1175974]}},{"type":"Feature","properties":{"resourceCoords":[607.0,1913.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7537509,42.1181002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p132","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0132","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1463.0,2126.0 501.1,2120.7 499.5,1599.5 329.5,1601.3 323.9,320.7 1249.4,312.7 1251.0,974.6 1463.0,972.4 1463.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0132/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75316108595113,42.12033993251344]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75333055629142,42.1149954155688]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76372749129516,42.11517938035452]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76355802095487,42.12052389729916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0133/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p133","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0133/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0133","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"221.2,2114.6 195.9,269.3 526.8,245.4 849.9,0.0 1454.0,0.0 1454.0,2123.7 221.2,2114.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0133/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74693474505227,42.119564413155814]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74335456159687,42.11952996929627]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74342198145939,42.11561951751068]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74700216491479,42.11565396137022]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p14","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0014","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"89.3,2126.0 93.4,0.0 1465.0,0.0 1465.0,2126.0 89.3,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,1128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6919561,42.073776]}},{"type":"Feature","properties":{"resourceCoords":[832.0,383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6919505,42.0751176]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0142/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p142","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0142/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0142","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1224.3,1346.3 1465.0,1374.7 1465.0,1792.9 1342.9,1844.4 1335.1,2126.0 959.1,2126.0 967.3,1901.1 661.4,1890.0 493.2,2008.3 352.1,1759.1 354.4,1515.2 342.4,1464.2 -0.0,890.8 -0.0,21.1 45.6,0.0 264.6,0.0 461.1,176.0 641.9,381.0 1017.5,208.7 1119.9,446.1 1134.0,514.5 1420.5,392.1 1465.0,472.2 1465.0,905.1 1355.2,996.6 1238.2,951.3 1249.8,1108.7 1140.7,1362.1 1224.3,1346.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0142/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74827073671985,42.12634662268746]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74115318621736,42.126471387339315]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74091079015018,42.11875617615636]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74802834065267,42.1186314115045]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0143/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p143","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"16"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0143/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0143","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"741.5,422.4 792.2,408.3 976.0,402.6 979.0,1911.6 225.2,1916.5 226.0,946.7 153.1,805.1 741.5,422.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0143/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[753.0,1915.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7537151,42.1211124]}},{"type":"Feature","properties":{"resourceCoords":[225.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7512542,42.1229915]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0144/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p144","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0144/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0144","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1293.5,1601.5 1465.0,1600.2 1465.0,2126.0 279.1,2126.0 277.9,1971.3 312.9,1971.0 301.8,468.0 230.2,468.5 228.4,107.1 1291.8,98.3 1293.5,1601.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0144/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75313654242858,42.123840973886274]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7532819700232,42.118535056799416]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76359029502215,42.11869269825949]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76344486742754,42.123998615346345]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0145/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p145","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0145/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0145","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"182.0,70.2 1454.0,75.6 1454.0,2126.0 -0.0,2126.0 -0.0,-0.0 291.3,0.0 182.0,70.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0145/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76850071471229,42.13069529535765]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76148732998526,42.13062972486224]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76161569521032,42.1229704712706]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76862907993736,42.12303604176601]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0146/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p146","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0146/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0146","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"222.1,78.6 804.3,80.2 786.6,53.4 867.2,0.0 1185.5,0.0 1294.2,170.4 1293.2,971.5 1329.4,1145.5 1333.0,2054.9 1473.0,2055.3 1473.0,2126.0 -0.0,2126.0 -0.0,2091.5 223.6,2091.3 222.1,78.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0146/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1333.0,1395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7560806,42.1254723]}},{"type":"Feature","properties":{"resourceCoords":[1333.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7561237,42.1230501]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0147/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p147","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0147/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0147","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"115.3,64.5 73.9,0.0 551.9,0.0 1341.2,54.2 1424.8,169.6 1454.0,245.3 1454.0,2067.5 211.8,2062.8 115.3,64.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0147/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75701617135775,42.13052928920506]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74996769407431,42.130458509753424]}},{"type":"Feature","properties":{"resourceCoords":[1454.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75010625636638,42.12276091317405]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75715473364981,42.12283169262568]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0148/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p148","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0148/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0148","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"275.0,1748.0 232.5,1341.1 460.1,1320.3 314.9,0.0 443.4,0.0 458.8,114.0 556.0,225.5 603.5,316.3 634.6,473.9 812.9,468.7 899.4,497.0 979.5,336.4 987.2,255.8 964.0,115.5 1317.3,275.7 1319.0,1306.1 1111.9,1307.5 1152.2,1399.0 952.8,1308.6 902.4,1308.9 542.9,2101.1 538.6,2068.5 379.0,2069.5 167.7,1962.9 275.0,1748.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0148/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75498030289984,42.12912513667888]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.748534457781,42.13144773116072]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74404623849722,42.12449908470929]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75049208361605,42.12217649022745]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0149/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p149","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0149/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0149","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"278.9,1894.5 198.8,1631.4 51.8,1296.2 259.8,1294.0 258.3,255.6 503.7,393.0 576.6,362.7 761.4,343.3 1012.9,217.1 1046.9,333.0 1049.1,381.9 1466.0,334.0 1466.0,1403.7 1106.3,1220.6 690.9,2037.0 693.6,1890.5 278.9,1894.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0149/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[683.0,1289.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7446109,42.1276102]}},{"type":"Feature","properties":{"resourceCoords":[254.0,502.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7481361,42.1294954]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p15","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0015","type":"ImageService3","width":1454,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.2,2038.5 127.5,1158.2 445.7,1155.0 437.2,286.7 668.9,287.2 666.6,0.0 1179.5,0.0 1162.2,2108.2 1454.0,2110.7 1454.0,2126.0 227.1,2126.0 227.6,2038.7 134.2,2038.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[371.0,1696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6908228,42.0700351]}},{"type":"Feature","properties":{"resourceCoords":[129.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6919735,42.0712571]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0150/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p150","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0150/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0150","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1429.2,2051.4 1034.2,2057.5 1140.7,1984.7 852.1,1992.2 855.6,2126.0 -0.0,2126.0 -0.0,43.9 309.5,37.6 513.1,84.5 1473.0,55.5 1473.0,627.9 1184.9,824.1 1473.0,1246.5 1473.0,1757.9 1359.2,1835.3 1402.2,1891.9 1429.2,2051.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0150/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1359.0,1835.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7660045,42.1311913]}},{"type":"Feature","properties":{"resourceCoords":[703.0,772.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7689994,42.1351203]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0151/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p151","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0151/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0151","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"195.9,121.3 126.1,143.3 112.8,83.0 156.6,-0.0 1466.0,-0.0 1466.0,116.6 1190.4,117.1 1184.2,1277.5 713.1,954.7 733.6,922.5 739.0,122.4 195.9,121.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0151/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76304538817651,42.1416288223592]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75925642338841,42.13713703428612]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76797931668264,42.133033691045206]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77176828147074,42.13752547911829]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0152/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p152","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0152/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0152","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.6,116.2 518.0,113.0 516.9,-0.0 1174.9,-0.0 1175.8,29.2 1473.0,26.9 1473.0,2004.6 1405.5,2110.5 1257.8,2044.2 1186.7,2048.6 1186.1,1910.2 761.0,1625.1 248.4,1630.7 241.6,116.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0152/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76058362257763,42.13871798851754]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75684819896256,42.13419104523284]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7655971904242,42.1301647283925]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76933261403927,42.1346916716772]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0154__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p154 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5892.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0154__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0154","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"576.7,28.0 461.9,27.7 452.1,1996.2 1177.2,877.1 1144.6,877.4 1143.4,779.0 1473.0,305.7 1473.0,104.2 576.6,98.6 576.7,28.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0154__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[165.0,1244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.762739,42.1327156]}},{"type":"Feature","properties":{"resourceCoords":[165.0,511.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7597178,42.1341214]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0155/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p155","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0155/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0155","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"135.3,1354.4 133.4,255.9 1257.9,250.1 1257.0,746.5 1220.3,916.1 1256.9,1114.9 1271.3,1392.7 1248.8,1522.0 1114.5,1780.1 1112.1,1948.9 135.3,1354.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0155/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75815191451919,42.13418725448562]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75211728345717,42.136962674248586]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74672803254991,42.130426711375215]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75276266361193,42.127651291612246]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0156/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p156","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0156/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0156","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"912.0,2126.0 893.9,1959.9 632.0,2055.7 447.6,2053.9 372.4,2075.5 144.8,1912.6 148.2,1745.2 283.0,1490.0 306.2,1361.9 293.6,1086.2 258.4,888.8 295.9,720.8 299.8,228.4 670.4,228.9 742.6,0.0 1473.0,0.0 1473.0,2126.0 912.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0156/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75416868958953,42.135927092273846]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74807909588672,42.13876619651721]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7425921336976,42.13220234549353]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74868172740041,42.12936324125017]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0157/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p157","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"4"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0157/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0157","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"261.8,1239.7 216.2,1216.2 186.7,1223.0 142.1,1172.0 29.1,1086.8 -0.0,1045.7 -0.0,735.1 42.7,706.2 148.0,540.1 -0.0,446.2 0.0,-0.0 1466.0,0.0 1466.0,2126.0 1001.8,2126.0 1006.2,2020.0 1041.5,2017.4 1042.0,1966.3 1095.4,1839.2 794.0,1842.2 769.0,1889.7 759.4,2022.4 511.1,2023.2 520.3,1960.9 584.6,1851.3 264.8,1853.4 261.8,1239.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0157/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[180.0,1746.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7606395,42.1376681]}},{"type":"Feature","properties":{"resourceCoords":[1006.0,2020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7522412,42.139146]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0158/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p158","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0158/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0158","type":"ImageService3","width":1473,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1130.0,2126.0 720.7,2126.0 720.2,2097.0 -0.0,2088.1 14.2,1429.7 234.9,1561.2 360.9,1580.2 364.2,1075.8 95.7,1055.3 -0.0,1004.2 -0.0,391.7 256.3,501.2 359.8,502.6 364.4,574.3 579.0,584.0 584.9,-0.0 906.6,-0.0 905.4,636.6 1134.3,709.4 1130.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0158/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75081429587834,42.1413786432045]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74700278954285,42.13683949383732]}},{"type":"Feature","properties":{"resourceCoords":[1473.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7557757328968,42.132731338832826]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75958723923229,42.1372704882]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0159/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p159","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0159/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0159","type":"ImageService3","width":1470,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"251.2,3.1 1470.0,0.0 1470.0,409.0 1430.8,501.0 1470.0,562.3 1470.0,1502.8 1339.0,1476.1 1336.5,1813.1 1312.6,1858.9 1231.2,1912.8 1204.3,1920.9 1203.8,2069.1 957.3,2070.0 724.4,2015.5 442.5,2016.2 439.6,2126.0 260.7,2121.1 253.1,419.7 287.7,401.9 253.0,409.1 251.2,3.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0159/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77430751841592,42.14515223994477]}},{"type":"Feature","properties":{"resourceCoords":[1470.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76719255032647,42.145088681819495]}},{"type":"Feature","properties":{"resourceCoords":[1470.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76731564991746,42.13740482477804]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77443061800692,42.137468382903315]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0016","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1465.0,0.0 1465.0,2126.0 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6868000677113,42.07619138477103]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67972617926408,42.07607931073002]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67994374906195,42.06840541487438]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68701763750917,42.06851748891538]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0160/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p160","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0160/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0160","type":"ImageService3","width":1479,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2066.2 -0.0,1960.4 -0.0,1912.2 261.3,872.0 951.0,197.8 1153.5,128.3 1479.0,70.8 1479.0,858.5 1479.0,1462.3 1479.0,1467.8 1479.0,1489.6 1423.9,1628.5 737.5,2063.1 -0.0,2066.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0160/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76845249936318,42.145124414514946]}},{"type":"Feature","properties":{"resourceCoords":[1479.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76125269167838,42.14504519656926]}},{"type":"Feature","properties":{"resourceCoords":[1479.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76140518764143,42.137317033144086]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76860499532623,42.137396251089775]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0161__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p161 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5864.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0161__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0161","type":"ImageService3","width":1466,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"461.2,0.0 460.9,249.6 460.2,747.1 0.0,747.6 -0.0,2126.0 170.0,2126.0 391.0,2126.0 1466.0,2126.0 1466.0,0.0 461.2,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0161__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1074.0,1522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7750757,42.1396862]}},{"type":"Feature","properties":{"resourceCoords":[1074.0,2024.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.775094,42.1378589]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0017","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"171.3,1953.7 162.0,239.5 713.1,238.0 1298.6,853.6 1306.0,1959.1 171.3,1953.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70175745346211,42.08233848206794]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.694721672458,42.082277627399506]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69484120812844,42.074556191177706]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70187698913254,42.07461704584614]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p18","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0018","type":"ImageService3","width":1455,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"475.0,567.5 734.1,244.0 798.4,296.3 1101.7,0.0 1455.0,0.0 1455.0,1684.3 1390.0,1685.3 1396.3,1973.6 1163.8,1976.7 1158.8,1779.0 469.0,1796.5 473.4,1982.9 104.8,1986.5 63.5,240.2 78.6,224.7 475.0,567.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[871.0,892.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6916764,42.0790068]}},{"type":"Feature","properties":{"resourceCoords":[1353.0,1283.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6894075,42.0775587]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p19","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0019","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"443.8,1576.8 422.4,1577.3 -0.0,2030.7 -0.0,1179.3 149.5,1319.7 312.2,1145.0 441.6,1267.2 447.0,1026.7 476.2,972.9 687.5,745.8 710.9,702.5 731.4,0.0 1448.0,0.0 1448.0,2126.0 904.4,2126.0 895.1,2044.4 487.4,2094.3 443.8,1576.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[717.0,428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6982211,42.0851956]}},{"type":"Feature","properties":{"resourceCoords":[731.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.694401,42.0821974]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p2","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0002","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"24.3,2126.0 -0.0,1141.5 301.0,1087.0 307.8,161.4 1408.4,0.0 1387.2,2126.0 977.9,2126.0 994.4,2071.5 607.6,1800.1 393.9,2126.0 24.3,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,1800.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7068448,42.0720366]}},{"type":"Feature","properties":{"resourceCoords":[301.0,1087.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7084301,42.0728355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0020","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"297.2,1484.9 1463.0,551.3 1463.0,2126.0 858.9,2126.0 602.6,1810.9 581.3,1828.2 297.2,1484.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6954122073258,42.07878280261269]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69080608012388,42.08283769075536]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6829228164913,42.07783450504908]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68752894369322,42.073779616906414]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p21","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"10"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0021","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,1418.7 329.9,1414.7 318.4,140.6 1308.9,136.3 1309.0,177.0 1080.7,177.5 1085.3,1045.0 1315.4,1045.0 1321.5,2038.2 959.6,2037.1 960.2,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1068.0,1045.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7286126,42.0791427]}},{"type":"Feature","properties":{"resourceCoords":[1309.0,177.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.727353,42.0823025]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0022","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"234.2,1070.1 -0.0,1068.9 -0.0,192.3 232.3,193.0 232.4,151.9 1231.7,152.6 1239.8,1812.0 234.8,1813.6 234.2,1070.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72846723829538,42.083011123979155]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72138141663034,42.08294946504881]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72150129158834,42.07525292374653]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72858711325338,42.075314582676874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p23","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0023","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"445.5,121.8 508.4,122.1 508.6,166.7 898.2,169.7 898.0,124.4 984.9,125.1 985.8,0.0 1448.0,0.0 1448.0,401.4 1217.9,399.6 1221.4,1863.6 906.1,1863.0 907.3,2126.0 103.2,2126.0 95.7,0.0 446.4,0.0 445.5,121.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[103.0,1706.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7225729,42.0754503]}},{"type":"Feature","properties":{"resourceCoords":[103.0,711.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7225196,42.079066]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p24","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0024","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"535.5,354.1 989.5,356.9 1428.3,1037.3 1230.2,1160.1 1231.7,1536.2 1291.4,1628.8 946.4,1845.0 715.6,1484.3 598.4,1557.1 538.9,1559.4 538.0,1868.0 -0.0,1864.0 -0.0,395.4 535.6,400.6 535.5,354.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[538.0,720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7144316,42.0789607]}},{"type":"Feature","properties":{"resourceCoords":[538.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7144794,42.0748017]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p25","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"11"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0025","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.6,1782.0 101.9,1720.8 97.8,1080.0 140.7,1050.8 256.4,1050.5 285.3,1019.9 278.1,317.6 249.2,291.8 89.7,287.0 28.9,161.2 1325.7,149.9 1325.4,54.2 1448.0,52.5 1448.0,2001.8 1235.5,2044.9 -0.0,2064.7 -0.0,1815.8 76.6,1782.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[319.0,815.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7358302,42.086513]}},{"type":"Feature","properties":{"resourceCoords":[319.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7418992,42.0866082]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0026","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"397.5,1985.6 189.3,1990.5 221.1,51.0 1463.0,54.6 1463.0,2126.0 1416.0,2126.0 1417.1,2049.4 570.8,2045.9 397.5,1985.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73198083859822,42.083184266013994]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73201373989258,42.077835132153375]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74241355652745,42.07787086837525]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74238065523309,42.08322000223587]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p27","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0027","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"67.9,2126.0 -0.0,2088.0 -0.0,453.2 1451.0,37.9 1451.0,2029.6 1361.8,2030.5 1361.2,2126.0 67.9,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[474.0,1007.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7271814,42.0859896]}},{"type":"Feature","properties":{"resourceCoords":[1023.0,161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7230834,42.0839628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0028","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"839.1,1017.2 843.1,676.0 579.8,677.5 580.8,872.5 552.8,916.2 82.6,909.2 83.3,743.5 -0.0,767.3 -0.0,260.2 69.9,284.4 182.1,212.7 191.3,28.5 249.7,-0.0 1344.5,-0.0 1343.9,243.3 1390.3,243.2 1388.5,550.4 985.5,550.7 985.9,1018.1 839.1,1017.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71317355595771,42.08513847766032]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71325709749816,42.079844731712654]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72354955312244,42.079935468717444]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72346601158199,42.08522921466511]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0029","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"651.5,619.0 677.9,673.3 960.1,673.6 1063.6,545.6 1064.1,2010.8 864.4,1711.6 650.7,1710.9 651.5,619.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71631675311862,42.08650687373543]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70927322228634,42.086448512898244]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70938762988999,42.07873506163736]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71643116072227,42.07879342247455]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0003","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1184.2,2126.0 1039.0,2126.0 854.4,1842.9 398.8,2126.0 -0.0,2112.0 -0.0,1357.6 401.1,1112.7 -0.0,473.6 -0.0,-0.0 1397.8,0.0 1396.4,1719.2 1175.9,1712.8 1184.2,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71105626850539,42.07979682352707]}},{"type":"Feature","properties":{"resourceCoords":[1462.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70752371807414,42.07978458773513]}},{"type":"Feature","properties":{"resourceCoords":[1462.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7075475222342,42.07594486940239]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71108007266544,42.07595710519433]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0030","type":"ImageService3","width":1463,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"352.1,103.0 1463.0,125.2 1463.0,320.6 1181.0,320.1 1185.0,1826.2 40.1,1832.4 41.5,2068.7 -0.0,2006.4 -0.0,538.1 352.1,103.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71115521618411,42.08643284318956]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7040682716144,42.086376050717]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70417869137535,42.078678707028075]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71126563594505,42.07873549950064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0032","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1418.9,1923.5 380.3,1922.3 381.9,1638.5 185.2,1637.7 191.3,1380.7 70.2,1380.4 71.8,1307.8 -0.0,1306.1 -0.0,645.3 55.5,705.0 77.5,691.0 584.8,234.9 640.1,220.3 983.0,213.8 1183.5,43.7 1182.7,223.8 1422.4,223.2 1418.9,1923.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69618641512332,42.08654880994245]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6962345544855,42.081271606209356]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7064671356339,42.08132374792153]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70641899627172,42.086600951654624]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0033","type":"ImageService3","width":1444,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"114.5,1729.8 102.3,472.9 85.5,439.0 -0.0,440.3 -0.0,53.5 130.1,54.4 131.2,147.2 147.5,130.4 139.4,47.3 164.2,-0.0 916.7,-0.0 917.4,58.1 960.4,85.8 977.3,136.2 1060.3,141.3 1074.7,154.1 1079.3,503.6 1065.1,518.9 1007.9,519.2 986.8,533.8 989.8,852.6 977.4,883.1 939.6,900.0 940.0,1023.9 1289.2,1020.0 1262.1,1352.8 1267.4,1404.0 1308.8,1674.3 1444.0,1673.5 1444.0,2126.0 -0.0,2126.0 -0.0,1730.4 114.5,1729.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7316445458358,42.09445016928492]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73198481443454,42.08389637191662]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75277645428896,42.08427077034255]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75243618569023,42.094824567710845]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0034","type":"ImageService3","width":1467,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1326.9,2126.0 -0.0,2126.0 -0.0,188.5 646.0,98.4 1314.2,156.7 1326.3,670.5 1381.1,1006.5 1376.8,1101.3 1318.7,1276.1 1326.9,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74830989391042,42.085865738416686]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7411649464352,42.08576736565133]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74135568607382,42.07802810884548]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74850063354903,42.07812648161084]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p4","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0004","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.0,0.0 1465.0,0.0 1465.0,174.3 1261.7,502.8 1338.7,503.9 1338.0,1368.4 152.0,1393.1 152.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[152.0,1727.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7077014,42.0766802]}},{"type":"Feature","properties":{"resourceCoords":[152.0,495.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7076853,42.0788941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p5","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0005","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"838.6,1873.8 259.6,926.4 62.1,1066.2 -0.0,964.3 -0.0,320.3 218.1,328.5 224.9,0.0 1401.0,0.0 1360.4,1870.4 838.6,1873.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[218.0,331.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7077014,42.0766802]}},{"type":"Feature","properties":{"resourceCoords":[615.0,2000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7066703,42.0736665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p6","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"23"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0006","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1182.8,1890.0 402.9,1891.0 397.3,897.4 359.1,897.1 458.8,733.6 458.2,647.1 251.4,648.5 249.5,174.7 1172.6,171.9 1182.8,1890.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[573.0,535.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7039318,42.0801722]}},{"type":"Feature","properties":{"resourceCoords":[791.0,1514.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029258,42.0766152]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p7","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0007","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,255.3 364.1,256.9 364.2,0.0 1358.1,0.0 1358.9,680.9 1462.0,681.0 1462.0,2126.0 -0.0,2126.0 -0.0,255.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[861.0,510.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7250244,42.0745635]}},{"type":"Feature","properties":{"resourceCoords":[1359.0,261.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7225729,42.0754503]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0008","type":"ImageService3","width":1465,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1291.5,2126.0 209.7,2126.0 224.1,-0.0 1288.0,-0.0 1287.9,342.3 1465.0,340.1 1465.0,1875.7 1290.7,1877.9 1291.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71814058426648,42.0823558380933]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71817432700331,42.08099569027985]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72081518233114,42.08103228960464]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72078143959429,42.082392437418086]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cook County, Illinois | 1950 | sanborn01804_002 p9","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"19"}],"created":"2026-09-21T17:07:17Z","modified":"2026-09-21T17:07:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0009","type":"ImageService3","width":1462,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"296.2,620.4 295.3,355.7 1068.8,359.7 1065.9,2121.3 -0.0,2126.0 -0.0,620.0 296.2,620.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041950:01804_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[726.0,656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7165676,42.0737482]}},{"type":"Feature","properties":{"resourceCoords":[753.0,1945.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7164976,42.0690925]}}]}}]}