{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01804_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Cook County, Illinois | 1938 | 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":"103"},{"label":"placed","value":"84"},{"label":"unplaced","value":"19"},{"label":"fit sources","value":"georef 53, georef-snap 29, georef-street 1, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"12 sheet(s) cut into 25 panels"},{"label":"unplaced pages","value":"p0 (tier 1, 42.13245,-87.76006 +/-250m); p105__2 (tier 2, 42.09325,-87.71312 +/-659m); p112__2 (tier 2, 42.09161,-87.72214 +/-100m); p11__2 (tier 1, 42.09885,-87.71935 +/-177m); p122__1 (tier 2, 42.10473,-87.72344 +/-922m); p123 (tier 1, 42.11492,-87.73758 +/-507m); p129__1 (tier 1, 42.11056,-87.73398 +/-145m); p134 (tier 2, 42.11604,-87.74308 +/-100m); p142 (tier 2, 42.12187,-87.74508 +/-442m); p153 (tier 1, 42.13390,-87.75951 +/-211m); p154__2 (tier 1, 42.08251,-87.74566 +/-162m); p157__1 (tier 2, 42.13922,-87.75938 +/-594m); p161__1 (tier 2, 42.14154,-87.77397 +/-175m); p161__3 (tier 2, 42.14154,-87.77397 +/-175m); p21__2 (tier 2, 42.07850,-87.71566 +/-1780m); p31__1 (tier 2, 42.08376,-87.70441 +/-448m); p31__2 (tier 1, 42.07288,-87.71412 +/-130m); p35__1 (tier 1, 42.09064,-87.72651 +/-521m); p35__2 (tier 2, 42.08749,-87.72772 +/-196m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0001/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 | 1938 | sanborn01804_001 p1","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0001","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"138.3,0.0 1002.1,0.0 998.7,1337.8 1393.1,1583.0 1131.5,1726.1 -0.0,1912.2 -0.0,996.8 140.0,997.0 138.3,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[140.0,997.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7107921,42.0756449]}},{"type":"Feature","properties":{"resourceCoords":[1001.0,147.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7100995,42.0777838]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0010/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 | 1938 | sanborn01804_001 p10","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0010","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1207.2,790.0 988.1,1869.4 946.0,1902.3 1295.0,1911.1 1302.4,1614.2 1448.0,1617.7 1448.0,2126.0 450.9,2126.0 246.8,2108.1 0.0,1445.5 0.0,-0.0 205.3,2.8 1207.2,790.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[743.0,1279.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7296499,42.1045493]}},{"type":"Feature","properties":{"resourceCoords":[1528.0,1279.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7297147,42.1098749]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0101/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 | 1938 | sanborn01804_001 p101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0101","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"150.2,262.6 1282.8,574.6 1452.0,455.5 1452.0,1988.9 1384.4,1768.2 1257.7,1800.2 426.2,1560.4 359.4,1798.0 1452.0,2110.9 1452.0,2126.0 1279.9,2100.3 1200.1,2126.0 1196.2,2076.5 851.0,1978.4 547.9,2126.0 173.7,2126.0 166.6,1362.5 -0.0,1315.3 -0.0,221.2 150.2,262.6 150.2,262.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7269531749766,42.09234649931191]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72011001380578,42.09370854774875]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71744148279456,42.086220469840335]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72428464396538,42.084858421403496]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0102/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 | 1938 | sanborn01804_001 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0102","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2055.8 313.4,501.9 382.1,262.3 997.2,0.0 1205.3,0.0 1350.2,476.6 1444.0,794.0 1452.0,1007.1 1452.0,1166.0 1452.0,1169.6 1154.3,1641.3 407.9,2126.0 -0.0,2126.0 -0.0,2055.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0102/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72509850419715,42.0878025380392]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71833138281761,42.08917640089668]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71563989406772,42.08177100864005]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72240701544726,42.08039714578256]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0103/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 | 1938 | sanborn01804_001 p103","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0103","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"194.8,1343.4 225.5,1251.4 1019.6,135.2 1261.5,426.1 1258.0,2031.8 332.9,2036.2 312.9,2023.1 313.6,1796.2 319.5,1579.2 344.7,1509.0 307.8,1510.8 46.5,1725.7 -0.0,1668.8 -0.0,1633.7 110.3,1473.4 126.3,1426.4 194.8,1343.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[943.0,1511.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7143866,42.0881058]}},{"type":"Feature","properties":{"resourceCoords":[1253.0,557.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7170096,42.0911919]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__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 | 1938 | sanborn01804_001 p104 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5466.0"},{"label":"split_canvas_w","value":"5808.0"},{"label":"split_canvas_h","value":"3038.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 1452.0,2126.0 1452.0,1511.0 310.4,1418.0 276.6,1397.6 280.9,1366.5 0.0,1366.5 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[902.0,1563.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7120355,42.0866717]}},{"type":"Feature","properties":{"resourceCoords":[1223.0,1491.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7114369,42.0877749]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__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 | 1938 | sanborn01804_001 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":"5808.0"},{"label":"split_canvas_h","value":"5466.4"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1452.0,0.0 292.6,0.0 199.2,116.7 636.7,466.8 204.7,1014.2 248.2,1043.3 32.2,1366.5 1368.1,1366.6 1367.4,1254.0 1452.0,1255.1 1452.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0104__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[555.0,1041.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7067666,42.087142]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,367.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7041252,42.0895424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0105__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 | 1938 | sanborn01804_001 p105 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"12"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5808.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0105__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0105","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1290.9,1946.2 1294.3,674.6 1131.1,680.6 1131.6,19.6 1452.0,19.8 1452.0,-0.0 535.6,0.0 535.5,504.3 796.4,795.6 -0.0,1509.8 -0.0,1603.0 252.7,1908.7 216.4,1937.8 1290.9,1946.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0105__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1295.0,987.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7104112,42.0917096]}},{"type":"Feature","properties":{"resourceCoords":[347.0,1943.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7170096,42.0911919]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0106/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 | 1938 | sanborn01804_001 p106","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0106","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"686.5,1940.0 161.5,1934.5 163.9,657.6 -0.0,663.8 -0.0,0.0 1452.0,-0.0 1452.0,220.4 688.7,824.9 688.0,973.0 1243.2,975.9 1244.6,1666.8 687.5,1712.0 686.5,1940.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[688.0,1600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7103752,42.0887305]}},{"type":"Feature","properties":{"resourceCoords":[688.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7084281,42.0904991]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0107/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 | 1938 | sanborn01804_001 p107","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0107","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"840.9,2058.3 -0.0,2050.2 -0.0,98.9 676.0,105.5 670.6,182.8 1127.0,185.2 1128.2,2122.7 1368.6,2122.5 1368.6,2126.0 808.2,2126.0 840.9,2058.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0107/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7485605,42.1015462]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7412806,42.101505]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74136179999999,42.0935958]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7486417,42.093637]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0108/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 | 1938 | sanborn01804_001 p108","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0108","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"114.7,59.1 239.8,60.4 239.6,0.0 1452.0,0.0 1452.0,1577.4 1236.7,1574.4 1237.1,1453.2 1029.5,1455.2 977.0,1435.0 976.7,2126.0 -0.0,2126.0 -0.0,135.2 107.3,135.8 114.7,59.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0108/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7429123598865,42.1013148480692]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7358769860216,42.1012778000024]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73594958008486,42.09358038478303]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74298495394977,42.09361743284983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0109/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 | 1938 | sanborn01804_001 p109","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0109","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"471.2,61.0 599.6,62.3 599.5,103.0 930.7,107.9 930.9,65.7 1261.7,69.0 1255.5,1571.7 1083.5,1671.1 1073.3,2126.0 -0.0,2113.9 -0.0,1423.0 52.1,1443.2 258.4,1441.2 258.0,1562.4 471.8,1565.3 471.2,61.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0109/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[927.0,1072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7336918,42.0973409]}},{"type":"Feature","properties":{"resourceCoords":[597.0,1567.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7353198,42.0955572]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0110/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 | 1938 | sanborn01804_001 p110","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0110","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,1666.5 -0.0,1666.5 143.3,61.0 647.7,46.4 1268.3,46.9 1327.8,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0110/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73270809419631,42.101200217814856]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72567327976915,42.10104288993314]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72598155606457,42.093346066973346]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73301637049173,42.09350339485506]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0111/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 | 1938 | sanborn01804_001 p111","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"42"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0111","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"288.8,2126.0 393.9,2060.0 393.9,1822.1 94.7,1821.2 99.3,1489.3 -0.0,1488.9 -0.0,469.7 580.5,-0.0 925.9,-0.0 968.8,51.5 1167.9,46.6 1217.7,30.9 1205.2,2014.4 672.1,2121.9 288.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[635.0,545.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7203379,42.0989217]}},{"type":"Feature","properties":{"resourceCoords":[1188.0,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.727561,42.096928]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0112__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 | 1938 | sanborn01804_001 p112 [1]","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"41"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5808.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0112__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0112","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"960.1,1902.2 955.3,2126.0 1039.8,2126.0 1038.3,1906.9 1452.0,1794.6 1452.0,-0.0 1059.0,-0.0 1019.8,48.4 986.7,48.2 984.0,-0.0 -0.0,0.0 -0.0,2102.6 960.1,1902.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0112__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[532.0,1997.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.727029,42.094923]}},{"type":"Feature","properties":{"resourceCoords":[392.0,920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7217361,42.0953995]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0113/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 | 1938 | sanborn01804_001 p113","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0113","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,116.4 1300.0,119.7 1275.7,2060.1 1232.6,2059.3 1232.1,2126.0 -0.0,2126.0 -0.0,116.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1379.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7478443,42.1084129]}},{"type":"Feature","properties":{"resourceCoords":[633.0,2049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7515009,42.1012166]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0114/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 | 1938 | sanborn01804_001 p114","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0114","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2044.0 -0.0,389.8 -0.0,107.0 79.0,107.3 78.2,55.4 1328.8,60.5 1345.4,2050.2 1221.8,2049.6 1218.8,2126.0 642.7,2126.0 647.8,2047.0 -0.0,2044.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0114/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[465.0,727.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.745989,42.1059494]}},{"type":"Feature","properties":{"resourceCoords":[1337.0,1391.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7417524,42.1034909]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0115/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 | 1938 | sanborn01804_001 p115","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0115","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"63.5,53.2 1081.2,58.1 1077.4,1060.3 1415.3,1061.9 1418.2,2059.1 1289.0,2058.4 1288.7,1985.6 77.9,1991.6 63.5,53.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0115/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74201378491054,42.108531423263834]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7349692347075,42.10846845372271]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73509263480298,42.10076187553577]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74213718500602,42.10082484507689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0116/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 | 1938 | sanborn01804_001 p116","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0116","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"883.1,2053.7 329.2,2053.5 328.0,57.4 -0.0,57.3 -0.0,-0.0 853.1,0.0 883.1,2053.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0116/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73756789462745,42.10838818137617]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7340312063063,42.10834474498908]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73411633011892,42.10447579867327]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73765301844007,42.10451923506036]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0117/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 | 1938 | sanborn01804_001 p117","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0117","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,31.4 67.5,0.0 1452.0,17.8 1452.0,2106.1 1186.9,2113.1 1014.0,2052.1 -0.0,2042.2 -0.0,31.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[329.0,730.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7346775,42.1070397]}},{"type":"Feature","properties":{"resourceCoords":[117.0,2044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7352087,42.1046208]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0118/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 | 1938 | sanborn01804_001 p118","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0118","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"505.5,0.0 689.6,173.8 905.8,83.8 1319.8,80.2 1322.7,1360.2 1452.0,1361.3 1452.0,2082.2 447.4,2116.7 430.2,0.0 505.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0118/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73293340167251,42.10835523153418]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72940304968114,42.10832909999488]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72945426054994,42.10446708331247]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73298461254132,42.10449321485177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0119/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 | 1938 | sanborn01804_001 p119","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0119","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"85.8,2126.0 59.1,59.1 1075.7,61.7 1166.9,125.8 1452.0,544.4 1452.0,1380.0 1401.0,1380.7 1411.2,2038.9 748.5,2042.1 749.4,2126.0 85.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0119/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73534938761917,42.10473074128141]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73181334162946,42.10467230442775]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73192785573455,42.10080383620563]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73546390172426,42.100862273059285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0011__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 | 1938 | sanborn01804_001 p11 [1]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"18"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5792.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0011__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0011","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"653.0,2126.0 869.0,2126.0 1362.1,2126.0 1163.0,199.0 916.7,198.2 671.4,424.8 671.4,516.6 572.2,516.4 -0.0,1044.9 -0.0,2126.0 653.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0011__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[698.0,1091.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.70527,42.0720119]}},{"type":"Feature","properties":{"resourceCoords":[1163.0,199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029382,42.075246]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0012/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 | 1938 | sanborn01804_001 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0012","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"331.8,2107.6 -0.0,1592.7 -0.0,1368.2 131.2,1572.9 138.0,1540.8 130.5,185.1 1274.7,187.1 1280.9,1136.4 1271.5,1192.7 1236.7,1245.5 1157.6,1295.5 1159.1,2126.0 -0.0,2126.0 -0.0,2107.8 331.8,2107.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0012/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70356606989989,42.07592757245763]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69648865880774,42.075868771290864]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6966041491178,42.06810086074985]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70368156020996,42.06815966191662]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0120/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 | 1938 | sanborn01804_001 p120","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0120","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1124.8,77.6 1221.9,1568.8 1452.0,1938.7 1452.0,2126.0 1215.9,2126.0 1168.9,2052.6 169.4,2058.8 169.0,1399.0 219.8,1399.0 229.6,737.6 346.4,738.8 49.2,278.2 371.7,77.5 1124.8,77.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[169.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.732012,42.1021621]}},{"type":"Feature","properties":{"resourceCoords":[169.0,737.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7320003,42.1033643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0121/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 | 1938 | sanborn01804_001 p121","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0121","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"483.4,1959.2 363.4,1760.3 314.2,1044.4 618.5,1045.2 614.1,688.4 288.3,689.3 283.0,59.0 722.4,59.0 773.8,120.3 905.4,120.2 905.2,0.0 1452.0,0.0 1452.0,642.6 1389.5,566.5 1104.5,515.3 1452.0,930.3 1452.0,1044.3 1271.8,1046.8 1275.7,2025.5 526.2,2025.3 591.4,2126.0 416.1,2126.0 368.0,2052.4 484.2,2051.3 483.4,1959.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[722.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7275415,42.1081596]}},{"type":"Feature","properties":{"resourceCoords":[283.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7297263,42.1081857]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0122__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 | 1938 | sanborn01804_001 p122 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"1609.6"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4198.4"},{"label":"split_canvas_h","value":"2602.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0122__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0122","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"967.6,645.8 1452.0,650.5 1452.0,-0.0 497.2,-0.0 492.4,83.8 476.3,95.5 778.0,485.2 857.4,490.6 967.6,645.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0122__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[402.4,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72233844509657,42.102897798380255]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71722098393751,42.103148773478225]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,650.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71701199261051,42.100786444904756]}},{"type":"Feature","properties":{"resourceCoords":[402.4,650.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72212945376957,42.100535469806786]}},{"type":"Feature","properties":{"resourceCoords":[943.2,611.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7195033,42.1008064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0124/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 | 1938 | sanborn01804_001 p124","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0124","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1452.0,2126.0 327.8,2126.0 381.6,1151.7 248.3,1144.3 243.8,1127.8 245.2,898.2 298.4,858.5 315.0,518.0 -0.0,78.9 470.4,70.0 469.0,0.0 1452.0,0.0 1452.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0124/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71933913303383,42.1009630080639]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71220442672407,42.101210743136754]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71171900209774,42.09340462572681]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7188537084075,42.09315689065396]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0125/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 | 1938 | sanborn01804_001 p125","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0125","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,69.0 1131.4,79.0 1130.4,0.0 1452.0,0.0 1452.0,81.8 1367.0,81.0 1370.4,2126.0 -0.0,2126.0 -0.0,69.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1367.0,1505.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7514348,42.1105006]}},{"type":"Feature","properties":{"resourceCoords":[1367.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7513449,42.1157472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0126/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 | 1938 | sanborn01804_001 p126","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0126","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.0,76.8 148.4,77.1 148.0,0.0 308.4,0.0 310.3,77.7 1452.0,81.8 1452.0,526.3 1329.0,565.8 1253.7,645.2 919.1,796.3 919.1,1077.4 1183.7,1078.6 1145.8,1283.0 1058.1,1472.1 1043.1,1553.8 1162.5,2073.8 814.4,2074.2 815.4,2126.0 75.3,2126.0 62.0,76.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0126/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75164083807725,42.116031246819006]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74455148332514,42.11593725376512]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74473570127299,42.10818257491208]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7518250560251,42.108276567965966]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0127/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 | 1938 | sanborn01804_001 p127","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0127","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"124.5,1521.5 139.6,1439.4 227.9,1249.2 266.1,1043.7 -0.0,1042.4 -0.0,759.7 336.5,607.9 412.3,528.1 536.0,488.4 536.0,372.4 536.0,372.4 536.1,41.3 771.5,41.4 771.1,0.0 1082.5,0.0 1080.8,2043.9 244.5,2044.5 124.5,1521.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0127/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74715789973249,42.115822973105935]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7401080496816,42.11573082066928]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74028865966604,42.10801933181377]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74733850971693,42.10811148425043]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0128/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 | 1938 | sanborn01804_001 p128","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0128","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"772.8,59.5 768.8,194.5 986.3,536.8 684.8,738.0 686.1,1079.0 1308.8,2031.1 930.6,2031.8 930.6,2060.6 -0.0,2062.0 -0.0,-0.0 1457.0,0.0 1457.0,61.8 772.8,59.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0128/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74190039126287,42.11581150407986]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73483417483828,42.11571473480301]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73502318256392,42.10801186972088]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74208939898851,42.108108638997734]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0129__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 | 1938 | sanborn01804_001 p129 [2]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"31"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5828.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0129__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0129","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.2,56.0 85.7,191.4 301.0,535.4 -0.0,735.9 -0.0,1078.8 409.4,1713.8 607.1,1715.2 608.8,2023.0 620.0,2040.6 781.0,2016.2 1027.8,2018.8 1029.2,2.0 771.6,0.0 771.4,61.1 90.2,56.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0129__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1145.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7330899,42.1118451]}},{"type":"Feature","properties":{"resourceCoords":[1017.0,523.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7336768,42.1138102]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0013/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 | 1938 | sanborn01804_001 p13","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"5"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0013","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"172.4,1241.8 207.3,1189.3 216.9,1133.1 217.0,185.0 947.6,195.0 947.1,1062.1 1448.0,1062.4 1448.0,2126.0 89.7,2120.6 93.6,1291.1 172.4,1241.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[217.0,555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.697354,42.0738385]}},{"type":"Feature","properties":{"resourceCoords":[217.0,185.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6973458,42.0751922]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0130/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 | 1938 | sanborn01804_001 p130","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0130","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"413.7,2024.8 -0.0,2033.6 -0.0,-0.0 1457.0,0.0 1457.0,2126.0 1322.7,2126.0 1270.4,2063.4 615.4,2065.8 507.8,2111.7 447.9,2069.9 413.7,2024.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[115.0,569.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.733061,42.113627]}},{"type":"Feature","properties":{"resourceCoords":[822.0,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7297263,42.1081857]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0131/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 | 1938 | sanborn01804_001 p131","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0131","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1172.1,1646.2 1252.2,1645.3 1247.6,2126.0 316.1,2126.0 317.7,1908.7 44.4,1907.2 48.7,1406.8 321.6,1407.1 329.2,410.4 1264.3,398.8 1257.0,1155.2 1179.0,1156.5 1172.1,1646.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0131/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74444767217722,42.120242281857145]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74453018076296,42.114952911746194]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75486219484768,42.11504284608109]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75477968626193,42.12033221619204]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0132/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 | 1938 | sanborn01804_001 p132","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0132","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1457.0,987.1 1457.0,2126.0 -0.0,2126.0 -0.0,2113.9 500.3,2109.3 495.5,1596.3 301.8,1597.0 305.0,322.0 1237.5,317.0 1234.5,988.0 1457.0,987.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0132/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.0,1095.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7586243,42.1171328]}},{"type":"Feature","properties":{"resourceCoords":[884.0,601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7562094,42.1171024]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0133/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 | 1938 | sanborn01804_001 p133","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0133/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0133","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.1,2101.1 207.9,258.9 538.4,236.8 857.6,0.0 1457.0,0.0 1457.0,2116.0 224.1,2101.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0133/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74696891400941,42.119544745750105]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74337425591509,42.11952351386713]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74341572929546,42.11560533658231]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74701038738979,42.11562656846529]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0014/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 | 1938 | sanborn01804_001 p14","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0014","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.4,2126.0 60.3,0.0 1448.0,0.0 1448.0,2126.0 60.4,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[796.0,1127.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6919561,42.073776]}},{"type":"Feature","properties":{"resourceCoords":[796.0,1761.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.691964,42.0726263]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0143/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 | 1938 | sanborn01804_001 p143","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0143/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0143","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 1161.8,-0.0 1162.8,83.3 1284.8,243.2 1297.1,1401.5 1023.9,1403.1 1023.0,1901.0 234.2,1907.4 233.6,1327.5 442.2,1222.1 -0.0,357.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0143/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[499.0,1409.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.751268,42.1220281]}},{"type":"Feature","properties":{"resourceCoords":[1023.0,1901.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.753719,42.1201618]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0144/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 | 1938 | sanborn01804_001 p144","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0144/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0144","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1457.0,1609.8 1457.0,2126.0 219.2,2126.0 220.4,1741.0 -0.0,1740.3 -0.0,828.5 205.7,828.7 207.0,607.0 277.4,607.3 281.1,104.4 1279.9,108.6 1262.1,1608.7 1457.0,1609.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0144/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1274.0,606.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7561583,42.1192045]}},{"type":"Feature","properties":{"resourceCoords":[207.0,607.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7561237,42.1230501]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0145/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 | 1938 | sanborn01804_001 p145","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0145/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0145","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1090.4,406.6 1090.2,73.0 949.0,72.0 1064.1,0.0 1127.3,0.0 1170.5,73.2 1457.0,72.2 1457.0,2126.0 -0.0,2126.0 -0.0,138.8 582.1,152.6 582.2,131.3 759.7,406.1 1090.4,406.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0145/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76848330302833,42.13067001748687]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76152638167886,42.130614894908724]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76163407111979,42.12303294501704]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76859099246926,42.123088067595184]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0146/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 | 1938 | sanborn01804_001 p146","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0146/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0146","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"190.3,72.3 782.1,76.0 764.6,49.0 839.0,0.0 1167.0,0.0 1273.4,168.1 1269.5,971.9 1305.3,1146.6 1308.0,1397.0 1086.5,1396.0 1087.0,1855.7 188.7,1857.5 190.3,72.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0146/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[793.0,1731.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7586365,42.1242688]}},{"type":"Feature","properties":{"resourceCoords":[1308.0,1397.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7560806,42.1254723]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0147/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 | 1938 | sanborn01804_001 p147","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0147/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0147","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"221.2,2053.2 -0.0,2052.1 -0.0,1386.1 224.3,1387.3 221.8,1135.6 185.8,960.0 190.5,151.8 134.7,63.9 245.0,63.5 345.0,0.0 401.8,0.0 441.4,62.8 606.7,62.7 1435.5,1359.5 1241.0,1478.6 1457.0,1824.6 1457.0,2063.7 723.2,2056.6 722.6,2126.0 220.9,2126.0 221.2,2053.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0147/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75711448848364,42.13052687953055]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7500172405094,42.13048096517408]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75010694026135,42.12274606601782]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75720418823559,42.12279198037429]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0148/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 | 1938 | sanborn01804_001 p148","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0148/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0148","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"431.1,1317.3 348.1,551.5 882.4,495.5 921.0,508.2 936.0,491.0 1032.8,481.0 1040.9,609.0 1145.0,531.9 1288.0,516.5 1289.5,438.3 1457.0,429.8 1457.0,706.6 1289.3,707.9 1289.2,972.8 1034.8,974.9 1035.7,1189.3 1276.9,1770.9 1355.3,2126.0 -0.0,2126.0 -0.0,1891.5 136.2,1961.3 242.9,1745.8 202.8,1337.7 431.1,1317.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0148/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75484281592149,42.129144353034526]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74849052622365,42.13144405417943]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74399774310035,42.12452106489313]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7503500327982,42.122221363748224]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0149/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 | 1938 | sanborn01804_001 p149","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0149/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0149","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,460.8 426.6,411.1 1457.0,363.1 1457.0,2126.0 319.4,2126.0 -0.0,1172.7 -0.0,460.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0149/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75030059755309,42.13069802828011]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74399276973435,42.1330053860029]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73948491458366,42.12613102673858]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7457927424024,42.123823669015785]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0015/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 | 1938 | sanborn01804_001 p15","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0015","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"272.5,1156.0 461.9,1155.5 460.1,446.4 678.8,446.2 677.1,0.0 1382.7,0.0 1361.3,28.4 1451.0,93.5 1451.0,1363.0 1208.2,1362.0 1199.8,2035.6 1451.0,2037.5 1451.0,2126.0 275.5,2126.0 272.5,1156.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[374.0,1689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6908228,42.0700351]}},{"type":"Feature","properties":{"resourceCoords":[679.0,978.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6893131,42.0725931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0150/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 | 1938 | sanborn01804_001 p150","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"23"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0150/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0150","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,148.3 103.0,146.2 217.4,313.1 328.9,321.4 444.9,403.7 864.0,1026.8 1167.3,821.7 1457.0,1250.2 1457.0,1747.5 1256.6,1883.2 1365.6,2044.5 1405.6,2044.1 1407.0,2126.0 -0.0,2126.0 -0.0,148.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0150/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[614.0,656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7693432,42.135538]}},{"type":"Feature","properties":{"resourceCoords":[1337.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7660045,42.1311913]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0151/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 | 1938 | sanborn01804_001 p151","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"10"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0151/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0151","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"283.1,2038.1 212.6,2126.0 -0.0,2126.0 -0.0,1322.5 327.2,1541.2 714.9,951.1 731.5,884.5 829.5,884.6 1075.7,516.4 734.6,510.3 735.0,117.9 190.0,112.3 119.9,133.8 106.7,73.3 145.5,-0.0 1457.0,-0.0 1457.0,117.8 1188.0,116.3 1174.6,1995.8 384.8,1993.1 283.1,2038.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0151/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[725.0,1621.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7678206,42.1362508]}},{"type":"Feature","properties":{"resourceCoords":[1181.0,521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7621253,42.1369938]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0152/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 | 1938 | sanborn01804_001 p152","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0152/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0152","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1460.0,96.1 1460.0,873.4 1156.1,875.4 1159.1,1616.0 1011.1,1617.5 1011.8,1799.1 743.3,1620.1 221.2,1625.1 216.2,108.2 485.5,105.1 484.7,28.5 1152.0,24.4 1154.7,117.0 1460.0,96.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0152/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76055358115742,42.13862325355742]}},{"type":"Feature","properties":{"resourceCoords":[1460.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7568500140568,42.13414694314228]}},{"type":"Feature","properties":{"resourceCoords":[1460.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7655781722599,42.130119414733926]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76928173936052,42.13459572514907]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0154__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 | 1938 | sanborn01804_001 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":"5828.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0154__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0154","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"738.7,2126.0 810.7,2013.7 811.1,1643.1 870.9,1552.1 1027.4,1550.5 1457.0,409.4 1457.0,-0.0 146.1,25.1 -0.0,117.8 -0.0,516.0 99.4,1603.5 -0.0,1603.5 -0.0,1783.6 123.5,1867.1 147.1,2126.0 738.7,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0154__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1119.0,501.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7571775,42.1311481]}},{"type":"Feature","properties":{"resourceCoords":[147.0,869.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7612148,42.1334203]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0155/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 | 1938 | sanborn01804_001 p155","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0155/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0155","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"143.2,1154.5 243.8,1154.2 238.8,597.6 811.1,597.7 742.5,323.2 761.4,0.0 1266.6,0.0 1261.0,744.6 1224.0,913.8 1260.2,1112.2 1274.0,1389.4 1251.2,1518.3 1116.8,1775.6 1091.7,2126.0 145.7,2126.0 140.6,1348.8 -0.0,1260.3 -0.0,818.6 144.6,819.4 143.2,1154.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0155/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75817944524076,42.13416282401697]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75217582701299,42.136936545106515]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74675650922744,42.13039412158754]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7527601274552,42.127620400497996]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0156/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 | 1938 | sanborn01804_001 p156","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0156/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0156","type":"ImageService3","width":1457,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"683.9,0.0 759.1,574.3 1355.5,543.2 1327.6,0.0 1457.0,0.0 1457.0,2126.0 167.4,2126.0 243.2,0.0 683.9,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0156/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[250.0,985.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7506214,42.1334851]}},{"type":"Feature","properties":{"resourceCoords":[624.0,230.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7508063,42.1365124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0157__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 | 1938 | sanborn01804_001 p157 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"855.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4984.8"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0157__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0157","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"304.6,1813.1 527.4,1990.2 763.8,2006.4 1088.6,1866.5 1279.4,1879.5 1262.5,2126.0 1460.0,2126.0 1460.0,0.0 213.8,-0.0 213.8,501.2 304.6,1813.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0157__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[252.8,1705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7604492,42.1377555]}},{"type":"Feature","properties":{"resourceCoords":[999.3,2021.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7522412,42.139146]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0158/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 | 1938 | sanborn01804_001 p158","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0158/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0158","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1460.0,1530.0 1460.0,2126.0 44.7,2126.0 44.3,2084.8 -0.0,2085.3 -0.0,1431.8 216.8,1560.0 343.0,1579.0 343.3,1075.3 74.3,1055.0 -0.0,1019.4 -0.0,0.0 1460.0,-0.0 1460.0,592.5 887.4,637.8 864.7,1576.1 1186.6,1596.6 1460.0,1530.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0158/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[703.0,1071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7533642,42.1370782]}},{"type":"Feature","properties":{"resourceCoords":[343.0,1579.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7564014,42.1372131]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0159/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 | 1938 | sanborn01804_001 p159","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0159/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0159","type":"ImageService3","width":1460,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,20.0 326.8,0.0 1460.0,0.0 1460.0,424.6 1405.9,554.8 1420.0,623.0 1460.0,663.3 1460.0,864.8 1230.3,701.6 1228.5,948.5 1280.1,988.5 1329.6,1076.8 1339.3,1475.9 1224.4,1478.3 1222.8,1679.2 549.4,2118.8 -0.0,2126.0 -0.0,20.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0159/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77429299083532,42.14516422211244]}},{"type":"Feature","properties":{"resourceCoords":[1460.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76722477517575,42.14508842999832]}},{"type":"Feature","properties":{"resourceCoords":[1460.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7673725750323,42.137402779885186]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77444079069187,42.13747857199931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0016/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 | 1938 | sanborn01804_001 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0016","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2069.4 -0.0,1388.0 247.4,1385.9 231.3,101.9 139.1,37.1 166.5,0.0 1451.0,0.0 1451.0,2126.0 256.7,2126.0 256.0,2068.6 -0.0,2069.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0016/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68661981165187,42.07614450432342]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67969440884829,42.07603978901443]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67989965638233,42.068454555338064]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6868250591859,42.06855927064706]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0160/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 | 1938 | sanborn01804_001 p160","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0160/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0160","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1055.8,2126.0 827.2,2126.0 -0.0,2073.8 -0.0,1361.8 -0.0,-0.0 1464.0,57.1 1464.0,491.6 1464.0,848.9 1464.0,848.9 1413.8,1623.4 1271.4,2126.0 1055.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0160/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76831016802927,42.14511057632698]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76122155198328,42.144993922058134]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76144841370983,42.13730712839536]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76853702975582,42.13742378266421]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0161__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 | 1938 | sanborn01804_001 p161 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5856.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0161__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0161","type":"ImageService3","width":1464,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1231.3,53.2 1464.0,40.5 1464.0,0.0 465.9,0.0 467.8,249.7 472.4,748.4 0.0,750.0 -0.0,2126.0 1217.2,2119.2 1231.3,53.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0161__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1085.0,1521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7750757,42.1396862]}},{"type":"Feature","properties":{"resourceCoords":[1085.0,2017.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.775094,42.1378589]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0017/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 | 1938 | sanborn01804_001 p17","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0017","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"135.0,1962.8 168.2,230.1 704.3,241.9 1293.2,900.6 1273.5,1996.5 135.0,1962.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1320.0,241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6954061,42.0814759]}},{"type":"Feature","properties":{"resourceCoords":[2470.0,1281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6897777,42.077795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0018/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 | 1938 | sanborn01804_001 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0018","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.7,1954.4 72.9,233.0 88.1,218.0 1451.0,1400.0 1451.0,1591.5 1348.8,1590.2 1350.3,2126.0 1133.1,2126.0 1132.4,1769.3 439.6,1770.7 439.9,1958.6 76.7,1954.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[855.0,892.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6916764,42.0790068]}},{"type":"Feature","properties":{"resourceCoords":[1729.0,1589.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6874229,42.0764536]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0019/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 | 1938 | sanborn01804_001 p19","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0019","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"736.9,1061.5 736.9,1061.5 1292.3,465.2 792.9,0.0 1451.0,0.0 1415.2,1937.0 903.3,2003.8 910.5,2044.3 502.6,2095.3 413.2,1602.8 -0.0,2048.7 -0.0,1169.3 162.4,1321.0 395.1,1069.8 736.9,1061.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[728.0,427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6982211,42.0851956]}},{"type":"Feature","properties":{"resourceCoords":[745.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.694401,42.0821974]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0002/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 | 1938 | sanborn01804_001 p2","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0002","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"376.6,2126.0 -0.0,2126.0 -0.0,218.9 1382.0,0.0 1365.6,2126.0 961.0,2126.0 941.1,2040.3 583.7,1808.9 376.6,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[584.0,1809.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7068448,42.0720366]}},{"type":"Feature","properties":{"resourceCoords":[275.0,1095.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7084301,42.0728355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0020/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 | 1938 | sanborn01804_001 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0020","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"371.4,1454.3 518.5,1331.7 528.9,38.8 938.6,41.0 936.5,0.0 1451.0,0.0 1451.0,2126.0 819.1,2126.0 235.6,1433.8 306.4,1374.5 371.4,1454.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69534559683692,42.0788325742544]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69079257259394,42.08285726757858]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68290329904305,42.07787086387263]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68745632328603,42.07384617054845]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0021__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 | 1938 | sanborn01804_001 p21 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5804.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0021__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0021","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,890.2 287.3,890.2 292.0,1327.3 0.0,1328.4 -0.0,2126.0 1451.0,2126.0 1451.0,2108.1 1323.5,2107.4 1323.6,0.0 328.9,0.0 -0.0,46.5 0.0,890.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0021__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[581.0,1047.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7310421,42.0791734]}},{"type":"Feature","properties":{"resourceCoords":[1323.0,181.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.727353,42.0823025]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0022/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 | 1938 | sanborn01804_001 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0022","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"220.7,2126.0 215.4,1068.4 -0.0,1068.2 -0.0,196.0 209.9,195.8 209.6,0.0 1162.3,0.0 1211.6,199.9 1221.8,2126.0 220.7,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72835975580813,42.083026662371495]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72129739612,42.0829433872085]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72146063545597,42.075208887988936]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7285229951441,42.07529216315193]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0023/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 | 1938 | sanborn01804_001 p23","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0023","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,1765.4 116.2,1765.1 106.1,391.5 1326.5,390.4 1344.3,1850.5 117.0,1853.8 119.2,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[113.0,1372.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7225561,42.0766538]}},{"type":"Feature","properties":{"resourceCoords":[1337.0,1251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7165392,42.0770113]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0024/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 | 1938 | sanborn01804_001 p24","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0024","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"516.9,1858.2 93.5,1855.5 87.8,396.4 106.8,396.6 107.3,711.8 514.7,717.1 511.6,353.4 962.8,355.3 1361.2,968.7 997.7,1199.8 1265.3,1619.1 1206.4,1656.5 1451.0,2042.2 1362.9,2126.0 518.8,2126.0 516.9,1858.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[516.0,1259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7144532,42.0769857]}},{"type":"Feature","properties":{"resourceCoords":[89.0,712.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7165218,42.0789973]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0025/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 | 1938 | sanborn01804_001 p25","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"9"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0025","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"462.9,2126.0 -0.0,2126.0 -0.0,134.7 65.0,183.1 56.0,173.2 336.7,173.0 334.2,322.3 834.7,317.1 837.4,70.2 1082.3,68.0 1081.2,172.7 1255.0,172.6 1276.0,2034.2 1100.5,2050.8 467.1,2052.9 462.9,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[329.0,1311.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.73826,42.0865523]}},{"type":"Feature","properties":{"resourceCoords":[1333.0,815.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.735908,42.0828704]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0026/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 | 1938 | sanborn01804_001 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0026","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1054.3,2126.0 -0.0,2126.0 -0.0,0.0 31.5,-0.0 31.5,38.4 581.5,36.3 582.8,-0.0 1078.5,-0.0 1077.8,38.9 1399.2,42.5 1408.2,-0.0 1451.0,-0.0 1451.0,2126.0 1407.7,2126.0 1409.2,2046.0 1055.3,2043.4 1054.3,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73203935612975,42.083113960798215]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73207330468132,42.07783120949153]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74242899452997,42.07786838818095]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7423950459784,42.08315113948764]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0027/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 | 1938 | sanborn01804_001 p27","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0027","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"868.1,2023.6 867.0,2126.0 87.9,2126.0 -0.0,2077.1 -0.0,456.9 1256.6,82.0 1297.0,78.8 1314.8,1980.5 1283.4,1980.8 1285.0,2126.0 1111.5,2126.0 1112.7,2021.5 868.1,2023.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[479.0,1004.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7271814,42.0859896]}},{"type":"Feature","properties":{"resourceCoords":[1022.0,161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7230834,42.0839628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0028/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 | 1938 | sanborn01804_001 p28","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"24"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0028","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1088.3,1492.8 1084.7,1900.5 804.3,1900.5 674.8,1925.6 571.1,1852.4 562.4,1961.2 34.2,2110.1 -0.0,1986.8 -0.0,1752.7 220.3,1750.0 248.4,1698.8 311.0,1748.7 449.9,1750.1 489.9,1735.5 526.1,1692.5 533.6,910.2 63.2,901.9 22.1,945.8 -0.0,927.2 -0.0,657.7 561.5,655.8 561.9,275.2 650.9,218.8 690.2,244.1 1373.8,244.0 1358.7,1900.3 1243.5,1900.4 1310.9,1881.6 1200.8,1492.5 1088.3,1492.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7164113,42.0848644]}},{"type":"Feature","properties":{"resourceCoords":[1363.0,1492.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7205107,42.0801965]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0029/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 | 1938 | sanborn01804_001 p29","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0029","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"7.5,17.6 1307.7,318.7 1451.0,126.5 1451.0,1831.2 1097.8,1830.5 1097.8,2078.1 956.8,1858.7 408.5,2067.7 -0.0,2060.2 7.5,17.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[409.0,1205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7144061,42.0820964]}},{"type":"Feature","properties":{"resourceCoords":[1342.0,673.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7098223,42.0840118]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0003/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 | 1938 | sanborn01804_001 p3","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0003","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1448.0,2126.0 1028.0,2126.0 -0.0,496.1 -0.0,-0.0 1379.0,0.0 1379.0,1717.5 1448.0,1718.4 1448.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1379.0,1091.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7076931,42.0778166]}},{"type":"Feature","properties":{"resourceCoords":[1379.0,497.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7076853,42.0788941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0030/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 | 1938 | sanborn01804_001 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0030","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1156.5,321.6 1162.0,1347.2 1451.0,1345.8 1451.0,2126.0 721.9,2126.0 719.5,1820.2 382.9,1822.2 369.5,121.1 1451.0,123.0 1451.0,321.3 1156.5,321.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71106687214748,42.08645540498157]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70399533603438,42.08638493770388]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70413347634667,42.07864080975801]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71120501245977,42.078711277035694]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0032/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 | 1938 | sanborn01804_001 p32","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0032","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1383.2,1911.9 355.9,1911.2 357.5,1618.4 158.8,1617.2 160.7,1379.3 48.9,1379.1 50.7,1295.2 -0.0,1294.8 -0.0,0.0 808.8,-0.0 808.8,-0.0 1137.2,-0.0 1138.7,75.8 1025.0,183.8 1046.2,242.7 1386.0,241.7 1383.2,1911.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1045.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7009716,42.0826975]}},{"type":"Feature","properties":{"resourceCoords":[365.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7009472,42.0851704]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0033/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 | 1938 | sanborn01804_001 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0033","type":"ImageService3","width":1451,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1451.0,2126.0 -0.0,2126.0 -0.0,1735.0 155.4,64.3 185.9,-0.0 918.8,-0.0 1346.8,96.8 1451.0,1663.2 1451.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0033/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7314701671666,42.094577813364275]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73178526027489,42.083853853856915]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75281076652283,42.08419886991102]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75249567341453,42.09492282941838]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0034/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 | 1938 | sanborn01804_001 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0034","type":"ImageService3","width":1452,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1305.8,2126.0 -0.0,2126.0 -0.0,-0.0 1282.2,0.0 1287.7,546.7 1305.5,721.5 1200.3,723.4 1219.6,1773.8 1301.9,1773.4 1305.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74817873507618,42.08589483373743]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7410831398811,42.08577199772055]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74132377307097,42.07800680362177]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74841936826606,42.07812963963865]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0004/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 | 1938 | sanborn01804_001 p4","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"10"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0004","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"203.9,2126.0 201.0,1720.9 131.9,1720.4 123.9,619.2 1300.4,620.1 1307.5,1729.1 477.1,1723.0 263.5,2126.0 203.9,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1010.0,499.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7055192,42.0788737]}},{"type":"Feature","properties":{"resourceCoords":[123.0,499.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7076853,42.0788941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0005/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 | 1938 | sanborn01804_001 p5","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0005","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"702.1,1712.1 216.3,841.5 513.8,361.7 1239.9,416.2 1199.2,1078.5 1448.0,1096.0 1448.0,1747.4 702.1,1712.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[212.0,339.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7077014,42.0766802]}},{"type":"Feature","properties":{"resourceCoords":[502.0,1815.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7066703,42.0736665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0006/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 | 1938 | sanborn01804_001 p6","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0006","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"372.8,964.4 510.6,964.1 508.7,188.4 1136.5,184.2 1153.0,1883.5 381.5,1887.3 372.8,964.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[378.0,1513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7048309,42.0766375]}},{"type":"Feature","properties":{"resourceCoords":[764.0,1513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029258,42.0766152]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0007/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 | 1938 | sanborn01804_001 p7","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0007","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"487.2,340.8 487.2,322.9 1233.2,327.2 1230.2,686.4 1348.9,687.4 1349.0,416.2 1448.0,416.9 1448.0,1982.6 1357.3,1981.8 1354.4,2126.0 -0.0,2126.0 -0.0,340.7 487.2,340.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[854.0,513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7250244,42.0745635]}},{"type":"Feature","properties":{"resourceCoords":[1349.0,266.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7225729,42.0754503]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0008/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 | 1938 | sanborn01804_001 p8","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0008","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"347.0,327.5 1048.0,334.0 1049.2,948.3 1244.1,931.5 1243.0,2090.6 1448.0,2090.0 1448.0,2126.0 -0.0,2126.0 -0.0,2041.2 250.0,2041.6 253.2,1897.0 344.1,1897.9 347.0,327.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[656.0,1901.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7206413,42.0691465]}},{"type":"Feature","properties":{"resourceCoords":[1048.0,334.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.718649,42.0748478]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0009/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 | 1938 | sanborn01804_001 p9","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"14"}],"created":"2026-09-21T19:13:24Z","modified":"2026-09-21T19:13:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0009","type":"ImageService3","width":1448,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"474.1,2126.0 478.6,965.0 283.4,981.3 284.0,366.0 1134.1,374.1 1134.4,518.6 1134.6,642.2 1448.0,643.8 1448.0,2126.0 474.1,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g018041938:01804_1938-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[284.0,366.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.718649,42.0748478]}},{"type":"Feature","properties":{"resourceCoords":[475.0,1942.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7177536,42.0691071]}}]}}]}