{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_087.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1950 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"81"},{"label":"placed","value":"78"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef 63, georef-snap 14, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"2 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p134__2 (tier 2, 41.91615,-87.63554 +/-321m); p163 (tier 1, 41.92451,-87.67264 +/-115m); p93__2 (tier 1, 41.91397,-87.63294 +/-140m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p100","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0100","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"801.4,97.1 1341.5,97.1 1382.0,133.0 1395.6,1741.5 1272.2,1799.5 395.9,1793.0 154.2,1737.2 103.3,1310.7 71.3,1277.5 84.7,1269.2 99.5,1279.0 97.6,1261.8 444.6,1057.6 252.2,758.5 134.5,602.5 724.0,155.2 700.8,122.2 643.0,97.1 801.4,97.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1377.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65312430075669,41.91088538234896]}},{"type":"Feature","properties":{"resourceCoords":[-125.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65321266172162,41.91354399961147]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p101","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0101","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1322.2,1083.6 1270.9,1080.2 1232.1,1048.5 1049.7,873.9 783.0,607.9 668.4,494.8 342.6,175.1 1.0,681.0 1.0,694.1 11.0,695.0 11.0,711.0 1.0,711.9 1.0,718.0 9.0,718.0 13.0,723.0 13.0,739.0 1.2,739.9 64.2,804.1 78.6,1508.9 151.2,1614.7 141.8,1647.7 778.5,1648.1 785.0,1621.0 1018.6,1622.8 1278.0,1621.2 1322.0,1621.0 1322.0,1574.1 1322.3,1231.9 1322.6,1145.8 1322.2,1083.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1322.0,1621.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6573429,41.9165242]}},{"type":"Feature","properties":{"resourceCoords":[785.0,1621.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582599,41.9158289]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0102","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"414.2,1812.0 375.2,1811.2 37.2,1544.3 84.2,1515.1 125.2,1391.8 49.9,968.3 60.1,579.5 209.4,93.1 863.6,104.6 760.2,508.1 923.1,681.5 1078.0,854.5 1262.9,1035.5 1418.2,1200.0 1418.0,1236.9 1417.9,1254.2 1417.8,1278.8 1202.2,1276.6 996.2,1254.8 589.9,1172.2 436.0,1750.7 421.5,1812.2 414.2,1812.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1395.0,1298.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65530176263994,41.915016622914614]}},{"type":"Feature","properties":{"resourceCoords":[1395.0,99.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65736568581703,41.916473633988986]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p103","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0103","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"232.9,605.2 233.1,310.3 741.7,316.7 741.7,308.1 1239.0,311.0 1239.0,1541.0 700.6,1540.0 232.0,1536.6 232.9,605.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1239.0,1541.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6507855,41.9137855]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,311.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6508637,41.9159955]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p104","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0104","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"246.3,316.1 747.0,319.0 747.0,327.9 1245.0,306.2 1244.9,332.9 1243.2,1549.2 246.6,1545.5 246.3,316.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[747.0,319.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6496542,41.9160138]}},{"type":"Feature","properties":{"resourceCoords":[747.0,1547.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6495766,41.9138064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p105","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0105","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1238.4,1518.0 741.0,1515.0 741.0,1523.6 232.3,1517.0 232.8,1137.3 233.6,532.8 233.9,316.7 1238.8,323.3 1238.4,1518.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[741.0,1515.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6520646,41.9159771]}},{"type":"Feature","properties":{"resourceCoords":[741.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6521415,41.9181237]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p106","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0106","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1245.4,1471.0 1245.3,1510.2 746.0,1532.0 746.0,1523.0 244.0,1520.1 243.8,322.9 1246.6,329.0 1245.4,1471.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[746.0,1523.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6496542,41.9160138]}},{"type":"Feature","properties":{"resourceCoords":[746.0,326.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6497295,41.9181595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p107","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0107","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"286.7,311.0 428.1,311.0 742.0,311.0 1237.5,311.0 1238.8,551.4 1243.4,1452.3 748.8,1490.7 244.8,1458.9 244.8,1446.7 239.0,311.0 286.7,311.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[239.0,311.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6485234,41.9181776]}},{"type":"Feature","properties":{"resourceCoords":[742.0,311.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6473048,41.9181957]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p108","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0108","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.6,339.8 223.5,286.0 730.0,319.8 1227.3,283.1 1228.4,991.6 1231.0,1559.0 225.0,1559.0 223.6,339.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[225.0,1559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6483777,41.9138258]}},{"type":"Feature","properties":{"resourceCoords":[1231.0,1559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6459534,41.9138684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p109","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0109","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.2,520.2 243.0,279.0 1253.0,279.0 1252.8,332.5 1254.3,1500.2 755.1,1503.3 755.2,1509.4 249.3,1512.6 244.2,520.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0109/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[243.0,279.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6461042,41.9182136]}},{"type":"Feature","properties":{"resourceCoords":[1253.0,279.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6436646,41.9182499]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p110","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0110","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.0,969.1 249.2,349.2 756.7,353.7 756.7,347.6 1257.4,352.1 1247.0,1104.8 1247.0,1152.0 1245.8,1550.1 747.2,1544.5 239.0,1537.0 243.0,969.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0110/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1247.0,1152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6435597,41.9146216]}},{"type":"Feature","properties":{"resourceCoords":[239.0,1537.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6459534,41.9138684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p111","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0111","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"608.0,1733.1 360.8,1534.5 238.4,1383.2 93.1,949.8 122.9,302.1 327.7,148.3 350.1,184.2 362.7,204.3 577.0,207.2 1404.6,227.6 1404.2,299.6 1402.5,609.0 1400.5,979.4 1429.0,1009.1 1403.2,1604.5 737.0,1653.0 738.7,1732.2 608.0,1733.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1402.0,1190.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6631177,41.9189801]}},{"type":"Feature","properties":{"resourceCoords":[1402.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6631463,41.9198663]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p112","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0112","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1428.2,1478.2 1387.8,1436.6 1292.2,826.3 1474.0,831.2 1474.0,706.8 673.5,297.8 675.8,167.8 1.0,202.3 1.0,282.5 108.0,284.1 55.8,1265.6 151.6,1472.8 508.9,1714.3 887.0,1663.9 1214.2,1738.9 1329.5,1684.1 1361.5,1475.2 1428.2,1478.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0112/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6647390663494,41.918471911337065]}},{"type":"Feature","properties":{"resourceCoords":[1475.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6611809731657,41.91859246666293]}},{"type":"Feature","properties":{"resourceCoords":[1475.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66097997685841,41.91530388759315]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66453807004211,41.91518333226728]}},{"type":"Feature","properties":{"resourceCoords":[657.0,809.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6630654,41.9170726]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p113","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0113","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.0,1144.0 84.2,521.9 55.0,492.2 53.0,118.2 52.6,62.7 707.6,385.0 829.0,503.4 901.7,576.0 928.6,603.0 941.9,616.3 1468.5,1142.8 1435.6,1176.8 1351.0,1264.4 1282.8,1335.0 1093.7,1529.7 1321.7,1756.9 1159.6,1757.3 882.5,1759.0 877.5,1635.0 66.6,1253.2 65.0,1144.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[93.0,-308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66306697792221,41.920806384239775]}},{"type":"Feature","properties":{"resourceCoords":[93.0,1763.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.66300187550594,41.91707386495443]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p114","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0114","type":"ImageService3","width":1477,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"716.0,1093.9 749.3,1059.9 223.3,525.6 183.2,484.8 110.5,411.1 350.3,165.1 1355.0,165.0 1359.5,1118.7 1360.7,1174.9 1359.7,1421.6 1355.6,1610.1 1324.4,1639.8 1284.9,1673.7 1234.3,1678.2 978.5,1680.8 596.8,1677.0 369.0,1446.5 560.9,1252.0 716.0,1093.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0114/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[843.0,165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6595092,41.9198289]}},{"type":"Feature","properties":{"resourceCoords":[1355.0,165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582777,41.9198479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p115","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0115","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"254.3,1369.3 258.5,423.4 1253.9,432.4 1251.5,1436.9 1205.3,1436.3 798.1,1431.5 789.1,1431.4 752.2,1430.9 713.8,1430.5 700.5,1430.3 295.4,1425.5 255.0,1425.0 254.3,1369.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0115/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[758.0,428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6570662,41.9198666]}},{"type":"Feature","properties":{"resourceCoords":[255.0,1425.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582136,41.9180407]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p116","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0116","type":"ImageService3","width":1477,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1231.5,1750.2 1290.2,1806.0 1068.0,1806.0 814.0,1816.0 586.0,1810.0 352.3,1809.4 118.8,1439.6 284.8,1272.2 466.6,1083.8 497.5,1051.9 154.8,716.4 109.6,672.8 140.0,642.5 139.8,454.7 135.0,209.0 582.3,199.9 680.4,197.9 1135.7,188.6 1295.7,185.4 1297.0,240.4 1301.0,403.4 1309.3,1223.2 1358.0,1269.7 1393.5,1303.7 1371.4,1326.3 1089.1,1614.7 1114.2,1638.5 1231.5,1750.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1146.0,202.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65577156287739,41.91804892026773]}},{"type":"Feature","properties":{"resourceCoords":[142.0,157.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65819641039829,41.918134150406075]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p117","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0117","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"209.2,66.6 1224.5,63.8 1232.0,1082.0 1233.6,1299.5 1237.2,1780.0 805.8,1795.0 805.8,1784.9 375.3,1802.0 380.9,1301.5 380.0,1082.0 218.9,1082.0 209.2,66.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[380.0,1082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.65541,41.9180781]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,1082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6533659,41.9181054]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p118","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0118","type":"ImageService3","width":1477,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"794.2,43.8 794.2,53.8 1222.9,41.7 1223.1,168.6 1223.9,843.0 1225.0,1774.0 1136.9,1791.7 546.2,1184.8 381.6,1017.3 364.5,1000.2 269.8,905.2 155.4,790.4 131.0,765.9 420.9,485.2 443.7,463.2 409.0,428.3 361.6,380.5 366.4,58.1 794.2,43.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0118/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6562781502274,41.91688108734955]}},{"type":"Feature","properties":{"resourceCoords":[1477.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65271258907426,41.91694532835231]}},{"type":"Feature","properties":{"resourceCoords":[1477.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65260562805969,41.91365430938636]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.65617118921283,41.9135900683836]}},{"type":"Feature","properties":{"resourceCoords":[1225.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6532173,41.9137458]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p119","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0119","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1228.2,1433.3 228.5,1426.7 229.8,420.1 1228.5,425.9 1228.2,1433.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0119/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[733.0,423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6522066,41.919942]}},{"type":"Feature","properties":{"resourceCoords":[733.0,1430.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6521415,41.9181237]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p120","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0120","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1235.6,470.9 1240.2,896.5 1242.9,1160.7 1242.8,1374.5 1243.4,1450.3 239.1,1453.3 229.6,437.1 1235.2,433.2 1235.6,470.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[731.0,441.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64979748042222,41.91996891653822]}},{"type":"Feature","properties":{"resourceCoords":[229.0,1449.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.650964168251,41.9181490708941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p121","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0121","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1241.8,418.3 1213.0,1413.0 239.1,1416.1 238.5,1341.8 238.6,1132.2 231.0,416.1 1241.8,418.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[231.0,419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6485845,41.9199981]}},{"type":"Feature","properties":{"resourceCoords":[1225.0,1413.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6461042,41.9182136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p122","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0122/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0122","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"206.7,1415.0 239.5,395.4 748.4,398.1 766.4,393.6 785.0,389.1 1189.7,395.4 1232.0,395.3 1238.2,1415.0 219.0,1415.0 206.7,1415.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[727.0,1415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6448882,41.9182317]}},{"type":"Feature","properties":{"resourceCoords":[219.0,1415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6461042,41.9182136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p123","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0123/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0123","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"247.0,137.0 1183.2,133.8 1255.0,137.0 1257.0,206.6 1255.2,567.5 1255.2,1207.2 1254.5,1691.5 752.5,1720.9 247.7,1707.0 248.9,1204.9 249.3,1151.2 247.0,137.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[247.0,137.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6437284,41.9200659]}},{"type":"Feature","properties":{"resourceCoords":[1255.0,137.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6413027,41.9201089]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p124","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0124","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1205.2,1713.4 710.6,1717.7 251.9,1716.9 251.0,1670.2 243.4,263.9 742.4,273.6 1238.2,240.6 1241.0,663.5 1247.0,1713.0 1205.2,1713.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[744.0,710.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6424003,41.9164605]}},{"type":"Feature","properties":{"resourceCoords":[1247.0,1713.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6411366,41.9146573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p125","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0125","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"237.4,571.6 242.3,214.0 241.0,144.9 1242.2,158.7 1235.5,1166.8 1231.5,1600.9 1230.7,1688.2 730.4,1698.8 226.8,1700.6 231.9,1205.8 237.4,571.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[795.0,150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63995785799739,41.920132397491244]}},{"type":"Feature","properties":{"resourceCoords":[735.0,1159.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64002361623258,41.91830684900226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p126","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0126","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1245.0,1641.8 232.3,1723.0 232.3,1682.0 234.0,1682.0 235.6,623.7 236.0,212.0 742.1,205.4 1244.8,190.0 1244.9,428.8 1244.9,1631.8 1245.0,1641.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0126/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1245.0,675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6387514,41.9165089]}},{"type":"Feature","properties":{"resourceCoords":[234.0,1682.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6411366,41.9146573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p127","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0127","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1239.7,1422.5 1236.7,1618.2 1199.6,1558.5 1159.7,1552.1 1099.3,1563.2 1074.1,1605.5 1095.2,1653.6 810.1,1724.9 736.4,1650.5 236.7,1602.5 236.8,1580.7 238.4,1147.7 239.7,142.2 878.9,147.5 1188.2,152.5 1255.9,378.8 1255.2,1388.6 1255.2,1423.0 1239.7,1422.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[700.0,1151.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.637685,41.918339]}},{"type":"Feature","properties":{"resourceCoords":[700.0,146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6377515,41.9201588]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p128","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0128","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"252.3,1676.3 232.0,466.4 226.8,160.0 734.3,198.2 810.6,272.0 1098.1,193.8 1075.7,145.4 1100.4,102.0 1161.3,89.5 1201.9,95.2 1240.8,154.9 1243.7,697.5 1248.7,702.4 1252.9,913.1 1260.6,1684.7 1051.6,1688.0 291.2,1699.6 253.2,1716.3 252.3,1676.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1030.0,1697.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63683040242711,41.91476158659111]}},{"type":"Feature","properties":{"resourceCoords":[1262.0,715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63628843749672,41.91651885425199]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p129","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0129/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0129","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1230.5,1363.5 239.5,1359.0 239.4,1323.3 238.6,1002.4 233.9,623.5 232.0,470.4 231.0,353.0 489.9,353.0 672.0,353.0 688.8,353.0 735.8,353.0 1189.4,353.0 1239.8,353.0 1230.5,1363.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0129/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[231.0,353.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6486517,41.9218141]}},{"type":"Feature","properties":{"resourceCoords":[1235.0,353.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6462228,41.9218486]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p130","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0130","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"308.2,344.9 1234.0,351.0 1231.0,1361.0 788.7,1352.4 752.4,1361.0 214.4,1355.1 230.3,344.4 308.2,344.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1234.0,351.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6437838,41.9218833]}},{"type":"Feature","properties":{"resourceCoords":[1231.0,1361.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6437284,41.9200659]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p131","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0131","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.2,419.1 1228.6,423.4 1229.0,1427.0 1157.7,1423.8 228.0,1427.0 229.2,419.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0131/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[228.0,1427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6437284,41.9200659]}},{"type":"Feature","properties":{"resourceCoords":[1229.0,1427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6413027,41.9201089]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p132","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0132","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.0,422.0 1244.0,427.0 1245.3,1441.4 235.0,1433.0 238.0,422.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0132/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[235.0,1433.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6413027,41.9201089]}},{"type":"Feature","properties":{"resourceCoords":[1244.0,427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6389414,41.9219584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0133/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p133","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0133/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0133","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.0,413.0 272.4,413.2 511.1,414.7 1257.6,424.8 1257.7,512.5 1242.0,513.6 1247.8,1358.5 1186.7,1430.6 876.3,1425.1 235.0,1419.0 235.0,413.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0133/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[235.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6388719,41.920143]}},{"type":"Feature","properties":{"resourceCoords":[235.0,413.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6389414,41.9219584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0134__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p134 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5888.0"},{"label":"split_canvas_h","value":"7324.0"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0134__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0134","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"751.4,1784.4 751.5,1769.2 1076.9,1764.7 1156.0,1727.7 1161.0,1739.7 1194.5,1618.3 1378.8,1516.8 1323.5,1295.9 922.5,1286.1 879.3,1194.2 774.1,1161.3 752.5,805.0 634.6,673.4 442.8,153.8 331.2,75.4 171.2,117.0 171.0,35.0 158.1,34.6 155.3,34.5 146.0,777.4 150.8,782.4 151.3,993.7 145.1,1767.3 485.6,1768.1 492.6,1775.5 751.4,1786.0 751.4,1784.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0134__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[159.0,800.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63630009764947,41.91651019365627]}},{"type":"Feature","properties":{"resourceCoords":[753.0,1363.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63484493247735,41.91553288264126]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0135/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p135","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0135/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0135","type":"ImageService3","width":1469,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"247.1,420.7 1245.0,431.0 1241.0,1445.9 237.0,1435.0 247.1,420.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0135/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[237.0,1435.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6462228,41.9218486]}},{"type":"Feature","properties":{"resourceCoords":[1245.0,431.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.643848,41.9237174]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0136/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p136","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0136/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0136","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"251.0,1433.0 253.7,419.9 1251.0,429.0 1246.3,1442.2 251.0,1433.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0136/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[251.0,1433.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6437838,41.9218833]}},{"type":"Feature","properties":{"resourceCoords":[1251.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.641421,41.9237528]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0137/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p137","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0137/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0137","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.0,395.1 1088.9,397.3 1237.0,744.6 1267.2,1423.0 1246.0,1423.0 237.0,1423.0 235.0,395.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0137/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[237.0,1423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6413615,41.9219185]}},{"type":"Feature","properties":{"resourceCoords":[1246.0,1423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6389414,41.9219584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0138/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p138","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0138/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0138","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1239.8,1423.7 496.1,1424.7 258.3,1426.7 241.8,1426.8 206.4,758.9 57.6,417.9 1199.2,418.9 1244.7,663.9 1347.3,776.9 1305.8,1096.5 1348.2,1260.9 1300.2,1505.9 1241.2,1511.0 1239.8,1423.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0138/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[221.0,1427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6389414,41.9219584]}},{"type":"Feature","properties":{"resourceCoords":[1232.0,419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.636513,41.9238098]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0139/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p139","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0139/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0139","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"240.9,884.6 241.0,421.0 432.5,422.0 464.1,422.4 464.3,395.5 999.5,373.9 1245.4,412.2 1241.1,1434.8 237.3,1425.3 240.9,884.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0139/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1245.0,430.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6463364,41.9254912]}},{"type":"Feature","properties":{"resourceCoords":[241.0,421.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6487665,41.9254527]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0140/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p140","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0140/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0140","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.2,1239.5 236.4,621.0 235.4,418.5 1243.0,413.1 1247.8,1435.0 747.0,1436.8 683.0,1437.1 240.5,1438.8 238.2,1239.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0140/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[739.0,425.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64748720937732,41.92364677419724]}},{"type":"Feature","properties":{"resourceCoords":[230.0,425.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64871463643952,41.92363271992756]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0141/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p141","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0141/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0141","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"250.0,1432.3 240.1,408.4 292.6,415.8 422.2,290.4 535.0,269.8 969.8,284.4 1238.2,438.4 1243.8,472.4 1253.0,1429.0 250.0,1432.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0141/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,931.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6463042,41.9245834]}},{"type":"Feature","properties":{"resourceCoords":[1253.0,1429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.643848,41.9237174]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0142/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p142","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0142/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0142","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"252.5,438.2 502.7,367.7 872.2,367.4 1255.2,453.2 1259.7,1426.0 250.2,1426.0 244.0,464.3 238.5,430.1 252.5,438.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0142/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[925.0,1426.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6422256,41.9237411]}},{"type":"Feature","properties":{"resourceCoords":[1255.0,413.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6414799,41.9255646]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0143/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p143","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0143/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0143","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.4,470.2 544.0,372.5 1009.0,421.4 1021.1,420.6 1215.7,418.4 1001.6,1297.9 1060.5,1438.9 211.0,1435.0 211.0,465.1 233.4,470.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0143/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[211.0,1435.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.641421,41.9237528]}},{"type":"Feature","properties":{"resourceCoords":[211.0,425.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6414799,41.9255646]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0144/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p144","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0144/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0144","type":"ImageService3","width":1473,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"164.7,1280.5 376.3,421.7 807.2,389.7 919.4,319.3 1140.0,310.6 1363.0,485.6 1345.2,1418.4 1348.0,1434.5 221.8,1418.5 164.7,1280.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0144/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[758.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6381157,41.9256257]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.636581,41.9256566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0145/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p145","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0145/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0145","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"927.5,1628.5 719.9,1789.8 720.6,1763.0 537.5,1762.2 484.5,1678.7 225.4,1609.4 112.8,1184.7 121.6,771.0 570.0,274.4 838.6,533.5 934.7,626.3 1051.5,739.0 1277.0,1191.4 666.3,1196.1 681.4,1253.7 927.3,1628.2 927.5,1628.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0145/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66802725839369,41.92372165408698]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6645431502651,41.92373297658801]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66452427743333,41.92047231540875]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66800838556192,41.92046099290772]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0146/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p146","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0146/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0146","type":"ImageService3","width":1473,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"282.1,1619.3 45.2,1244.6 31.2,1187.3 632.5,1191.1 416.8,739.5 303.4,626.1 334.5,582.6 335.2,195.3 846.0,197.0 1362.0,197.0 1370.0,1195.0 1373.9,1693.9 535.2,1677.8 318.1,1676.2 305.2,1655.9 282.1,1619.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0146/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[846.0,197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6645088,41.9234023]}},{"type":"Feature","properties":{"resourceCoords":[1362.0,197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6632633,41.9234194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0147/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p147","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0147/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0147","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"221.0,417.0 980.1,417.0 1046.2,416.9 1229.8,417.0 1230.1,462.7 1235.9,1185.9 1237.9,1425.9 226.7,1418.7 221.0,417.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0147/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[730.0,417.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6620392,41.9234383]}},{"type":"Feature","properties":{"resourceCoords":[221.0,417.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6632633,41.9234194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0148/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p148","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0148/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0148","type":"ImageService3","width":1480,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.0,273.0 1236.7,272.7 1253.0,1282.0 1019.6,1525.0 899.8,1408.1 253.1,1089.5 251.8,835.7 251.4,764.0 245.0,273.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0148/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1253.0,1282.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6606943,41.9198104]}},{"type":"Feature","properties":{"resourceCoords":[245.0,273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6631996,41.9216273]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0149/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p149","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0149/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0149","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1255.2,1779.1 1182.2,1789.5 580.0,1737.6 376.5,1441.7 102.8,330.8 147.8,142.6 684.0,116.2 1087.5,168.7 1197.9,73.9 1257.3,92.1 1257.2,183.6 977.8,177.0 1083.5,286.1 1142.1,344.5 1256.8,461.5 1255.2,1779.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0149/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67168084896349,41.925390967292685]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6682052550862,41.925484369243755]}},{"type":"Feature","properties":{"resourceCoords":[1466.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66804956377965,41.922231778988646]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67152515765693,41.92213837703758]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0150/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p150","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0150/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0150","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1154.7,879.7 1008.0,1034.7 1260.5,1284.7 1261.8,1286.1 816.8,1773.0 818.0,1732.7 476.2,1790.0 449.6,489.5 170.0,214.8 444.0,215.2 442.1,124.9 577.5,163.4 1072.2,155.2 1145.1,224.0 1154.7,879.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0150/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[665.0,215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6681499,41.9251508]}},{"type":"Feature","properties":{"resourceCoords":[1145.0,215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6669884,41.9251628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0151/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p151","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0151/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0151","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"312.1,239.4 872.4,189.7 1288.2,253.6 1299.0,1207.0 791.7,1205.7 791.2,1590.3 760.4,1633.6 667.7,1541.0 407.1,1281.0 156.8,1031.1 303.4,877.4 296.4,224.5 312.1,239.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0151/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1299.0,1207.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6645088,41.9234023]}},{"type":"Feature","properties":{"resourceCoords":[791.0,216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6657862,41.9251779]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0152/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p152","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0152/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0152","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"103.3,461.1 126.5,464.7 457.1,374.3 919.9,398.7 966.2,324.9 1091.1,432.1 1379.9,452.4 1377.9,1416.7 1377.5,1416.7 625.0,1417.0 111.7,1416.0 103.3,461.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0152/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[625.0,1417.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6632633,41.9234194]}},{"type":"Feature","properties":{"resourceCoords":[103.0,422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.664579,41.9251964]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0153/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p153","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0153/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0153","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1343.7,1622.2 841.6,1716.3 841.6,1702.9 334.6,1663.0 330.4,1206.6 330.0,1161.0 146.8,1161.2 81.3,1161.3 82.5,190.5 92.2,191.2 244.9,73.8 478.6,48.2 891.0,116.5 1035.4,44.0 1334.1,134.0 1340.6,1209.1 1342.6,1395.0 1343.7,1622.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0153/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[330.0,1161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6608373,41.9234569]}},{"type":"Feature","properties":{"resourceCoords":[330.0,159.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6608844,41.9252536]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0154/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p154","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0154/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0154","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"273.9,1683.1 265.1,676.1 263.1,441.3 261.0,181.2 758.0,220.9 758.0,234.1 1250.3,142.4 1252.0,634.1 1257.0,1683.0 273.9,1683.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0154/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[756.0,1683.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6595092,41.9198289]}},{"type":"Feature","properties":{"resourceCoords":[1257.0,1683.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582777,41.9198479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0155/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p155","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0155/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0155","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.3,1208.7 227.7,126.5 303.4,149.3 1031.3,94.6 1239.7,145.7 1235.2,145.7 1243.8,1156.6 1249.0,1156.6 1252.2,1404.2 1253.5,1689.8 746.9,1710.3 746.9,1702.6 239.2,1678.2 237.6,1395.8 235.3,1208.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0155/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[235.0,1159.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6584026,41.9234945]}},{"type":"Feature","properties":{"resourceCoords":[738.0,148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6572429,41.9253121]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0156/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p156","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0156/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0156","type":"ImageService3","width":1481,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"246.4,617.5 248.4,170.2 751.4,199.5 751.4,207.2 1253.8,192.0 1252.4,428.7 1247.7,934.7 1242.6,1692.9 243.0,1685.0 246.4,617.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0156/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1251.0,677.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6559136,41.9217109]}},{"type":"Feature","properties":{"resourceCoords":[243.0,1685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6582777,41.9198479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0157/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p157","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0157/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0157","type":"ImageService3","width":1466,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"239.0,1165.0 233.9,1165.0 227.6,158.3 232.2,158.3 257.2,164.6 862.2,79.1 1247.2,136.2 1248.2,662.3 1247.0,1165.0 1249.4,1592.0 1249.9,1740.7 743.0,1739.3 742.9,1734.8 242.4,1732.2 241.7,1411.5 239.0,1165.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0157/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[239.0,1165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.655975,41.9235321]}},{"type":"Feature","properties":{"resourceCoords":[1247.0,1165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6535513,41.9235695]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0158/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p158","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0158/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0158","type":"ImageService3","width":1481,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.9,926.2 243.2,420.5 242.9,220.1 741.0,223.1 741.0,227.7 1245.5,229.6 1246.0,438.1 1250.0,1685.0 242.0,1684.0 241.9,926.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0158/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[743.0,670.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6547064,41.9217281]}},{"type":"Feature","properties":{"resourceCoords":[242.0,1684.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6558635,41.9198853]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0159/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p159","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0159/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0159","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1250.9,1649.6 747.2,1686.2 747.2,1694.0 238.7,1652.8 238.5,1573.8 236.8,1144.2 238.9,638.2 238.9,108.8 267.5,113.1 458.6,49.1 1248.7,142.4 1249.9,1392.8 1250.9,1649.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0159/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[745.0,1145.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6523372,41.9235883]}},{"type":"Feature","properties":{"resourceCoords":[239.0,129.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6536008,41.9253741]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0160/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p160","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0160/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0160","type":"ImageService3","width":1481,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.7,432.8 244.8,153.2 749.4,198.8 749.5,191.1 1250.0,159.5 1248.4,442.7 1241.3,1696.2 234.0,1685.0 242.7,432.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0160/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1247.0,680.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6510684,41.9217798]}},{"type":"Feature","properties":{"resourceCoords":[234.0,1685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6534278,41.919923]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0161/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p161","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0161/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0161","type":"ImageService3","width":1472,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"335.4,99.8 780.1,131.8 947.9,52.2 1263.0,149.3 1471.0,139.0 1471.0,166.0 1440.2,166.0 1247.2,166.8 1251.4,634.1 1253.0,1179.0 1252.9,1382.4 1251.9,1760.2 748.0,1741.0 748.0,1743.5 243.4,1720.8 241.8,1424.7 238.5,180.4 335.4,99.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0161/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[745.0,1179.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6499216,41.9236256]}},{"type":"Feature","properties":{"resourceCoords":[1253.0,1179.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6487018,41.9236445]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0162/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p162","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0162/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0162","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.8,446.1 238.7,203.0 743.0,228.4 743.0,225.8 1246.8,247.8 1244.8,490.9 1245.0,691.0 1248.0,1345.1 1246.4,1707.4 239.0,1702.0 238.8,446.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0162/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1245.0,691.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6486517,41.9218141]}},{"type":"Feature","properties":{"resourceCoords":[239.0,1702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.651004,41.9199606]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p85","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0085","type":"ImageService3","width":1479,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"184.4,1133.3 186.6,654.4 189.1,107.5 658.1,112.3 1197.0,115.0 1190.4,620.3 1251.6,682.2 1083.0,1125.2 1169.0,1213.7 1000.9,1213.9 1219.0,1664.8 1199.8,1661.4 1017.6,1723.7 378.2,1742.5 181.9,1665.8 184.4,1133.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1197.0,115.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6507855,41.9137855]}},{"type":"Feature","properties":{"resourceCoords":[184.0,1215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6531511,41.9117576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0086","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"149.4,1240.1 317.8,1236.6 229.9,1149.7 390.2,702.6 327.7,641.8 324.5,135.6 1324.3,123.1 1345.8,1702.0 1290.0,1754.0 815.7,1756.8 376.6,1687.5 149.4,1240.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1334.0,1743.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6483152784111,41.91092244899702]}},{"type":"Feature","properties":{"resourceCoords":[1334.0,135.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64835408972,41.91380467234946]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p87","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0087","type":"ImageService3","width":1479,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"246.7,128.2 1239.6,129.4 1244.2,1480.5 1241.6,1718.2 244.8,1685.5 246.7,128.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[747.0,1475.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6470745,41.9114013]}},{"type":"Feature","properties":{"resourceCoords":[747.0,128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6471562,41.9138487]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p88","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0088","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"257.2,1497.2 239.0,131.0 745.9,128.2 1243.2,123.8 1246.0,732.0 1253.5,1694.6 1122.1,1757.5 256.8,1737.6 257.2,1497.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1246.0,732.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6434999,41.9128155]}},{"type":"Feature","properties":{"resourceCoords":[239.0,131.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6459534,41.9138684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p89","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0089","type":"ImageService3","width":1479,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.0,423.0 793.6,425.0 1207.8,424.1 1245.2,447.5 1251.4,463.9 1254.0,479.3 1253.2,1388.7 1243.3,1377.6 730.2,1441.2 286.4,1431.1 245.0,1387.7 245.0,423.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,1427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.643445,41.9110155]}},{"type":"Feature","properties":{"resourceCoords":[245.0,423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6434999,41.9128155]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p90","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0090","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.6,430.2 241.3,414.7 236.7,401.3 237.2,378.8 743.5,391.5 791.6,387.4 1204.0,401.0 1254.0,421.6 1229.9,1407.4 1005.1,1419.2 986.1,1501.2 952.5,1416.7 288.9,1422.8 220.1,1339.9 243.6,430.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.64032220440394,41.91282726783646]}},{"type":"Feature","properties":{"resourceCoords":[225.0,405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6411135775658,41.91279919139378]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p91","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0091","type":"ImageService3","width":1479,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"362.2,1368.3 362.1,395.9 406.3,413.9 1147.3,414.9 1148.2,1391.6 362.2,1368.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[357.0,827.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63862471723809,41.91207396991808]}},{"type":"Feature","properties":{"resourceCoords":[1157.0,417.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63669443037573,41.91285244315024]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p92","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0092","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1153.8,1349.9 666.6,1407.2 350.3,1398.5 347.0,415.0 739.1,416.0 1156.0,415.0 1161.5,1355.5 1153.8,1349.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1156.0,415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6347566,41.9128858]}},{"type":"Feature","properties":{"resourceCoords":[347.0,415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6367183,41.9128558]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0093__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p93 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5900.0"},{"label":"split_canvas_h","value":"7324.0"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0093__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0093","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"162.0,1449.0 743.0,1453.7 791.3,1452.7 832.8,1379.8 864.8,1349.0 938.9,1307.9 1053.8,1577.2 1059.7,1502.9 1320.0,1472.7 1336.2,1139.5 1190.0,1061.5 1054.5,1139.5 825.0,1126.0 555.2,392.3 563.1,363.9 558.2,352.1 480.7,388.2 162.0,392.0 161.9,406.9 162.0,639.4 162.0,1449.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0093__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[162.0,392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6348249,41.9148091]}},{"type":"Feature","properties":{"resourceCoords":[162.0,1449.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6347566,41.9128858]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p94","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0094","type":"ImageService3","width":1470,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.0,413.5 697.6,412.2 746.5,410.7 787.8,336.4 819.9,304.9 894.5,262.4 1013.8,534.0 1009.1,601.1 1337.0,1229.6 1356.8,1395.1 1288.7,1431.5 1286.8,1551.7 1211.2,1580.5 1116.5,1398.8 207.5,1421.7 118.8,1358.1 109.0,413.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[123.0,422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63472255031355,41.91287097999461]}},{"type":"Feature","properties":{"resourceCoords":[123.0,1397.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63468481137707,41.91111925955648]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p95","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0095","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"240.2,816.8 236.7,418.5 700.7,422.7 1201.2,422.1 1241.8,422.1 1240.4,1455.2 1239.2,1452.2 1201.8,1428.8 787.1,1429.3 238.0,1427.0 240.2,816.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[741.0,423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6423458,41.9146346]}},{"type":"Feature","properties":{"resourceCoords":[238.0,1427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6434999,41.9128155]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p96","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0096","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.3,478.3 1255.8,396.6 1256.0,426.5 1256.2,1470.1 1205.5,1450.6 791.0,1447.1 742.9,1452.4 234.0,1452.0 235.3,478.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[743.0,1439.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6398682,41.9128915]}},{"type":"Feature","properties":{"resourceCoords":[237.0,437.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6411366,41.9146573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p97","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0097","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"353.8,412.1 391.4,396.2 1140.1,394.1 1144.7,1453.5 402.7,1455.5 358.3,1437.7 353.8,412.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[852.0,1454.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.637432,41.9128448]}},{"type":"Feature","properties":{"resourceCoords":[852.0,395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6374811,41.9147665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p98","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0098","type":"ImageService3","width":1471,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"749.0,1462.0 357.4,1461.9 352.0,398.0 558.6,397.3 894.5,396.1 901.4,403.2 1156.6,412.1 1158.7,644.7 1165.3,1460.0 749.0,1462.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[749.0,1462.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6357673,41.9128685]}},{"type":"Feature","properties":{"resourceCoords":[352.0,398.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6367786,41.914778]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_087 p99","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:32:35Z","modified":"2026-10-17T03:32:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0099","type":"ImageService3","width":1475,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.0,1830.0 180.0,1830.0 179.0,1809.0 146.6,1809.0 510.3,1183.7 345.4,1087.2 59.4,889.7 295.7,575.0 304.6,563.5 349.4,500.9 702.0,36.0 1037.9,260.8 1215.6,356.6 1409.3,438.2 1318.6,652.9 987.5,1425.4 1037.4,1499.3 537.0,1707.8 244.0,1830.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195002N:01790_02N_1950-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[702.0,36.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6568331,41.9141383]}},{"type":"Feature","properties":{"resourceCoords":[947.0,1537.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6532113,41.9135685]}}]}}]}