{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01790_010.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1897 | mapsnap generated fit (2026-09-24)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-24"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"142"},{"label":"placed","value":"111"},{"label":"unplaced","value":"31"},{"label":"fit sources","value":"georef 77, georef-snap 32, snap:0 1, georef-street 1"},{"label":"key map","value":"none"},{"label":"split sheets","value":"13 sheet(s) cut into 36 panels"},{"label":"unplaced pages","value":"p0a (tier 4, 41.75928,-87.65594 +/-43317m); p0b__1 (tier 1, 41.74945,-87.57969 +/-179m); p0b__2 (tier 1, 41.50549,-87.64135 +/-185m); p103__1 (tier 1, 41.78956,-87.90068 +/-100m); p103__3 (tier 4, 41.75928,-87.65594 +/-43317m); p103__4 (tier 4, 41.75928,-87.65594 +/-43317m); p103__5 (tier 4, 41.75928,-87.65594 +/-43317m); p105__1 (tier 1, 41.82195,-87.68040 +/-100m); p105__3 (tier 1, 41.82457,-87.69900 +/-133m); p122__1 (tier 1, 41.78067,-87.81150 +/-262m); p122__2 (tier 4, 41.75928,-87.65594 +/-43317m); p122__3 (tier 4, 41.75928,-87.65594 +/-43317m); p124__1 (tier 1, 41.85048,-87.63478 +/-276m); p124__2 (tier 4, 41.75928,-87.65594 +/-43317m); p125__2 (tier 1, 41.67617,-87.98904 +/-189m); p126__1 (tier 2, 41.67551,-88.00097 +/-100m); p126__3 (tier 1, 41.67539,-87.99405 +/-124m); p27 (tier 1, 41.74861,-87.76853 +/-260m); p33 (tier 4, 41.75928,-87.65594 +/-43317m); p35 (tier 1, 41.72619,-87.58619 +/-250m); p36__2 (tier 2, 41.72591,-87.58680 +/-100m); p36__3 (tier 1, 41.72504,-87.58383 +/-100m); p81 (tier 4, 41.75928,-87.65594 +/-43317m); p82__2 (tier 4, 41.75928,-87.65594 +/-43317m); p87__2 (tier 1, 41.89498,-87.62552 +/-249m); p97__1 (tier 4, 41.75928,-87.65594 +/-43317m); p97__2 (tier 4, 41.75928,-87.65594 +/-43317m); p97__3 (tier 4, 41.75928,-87.65594 +/-43317m); p97__4 (tier 4, 41.75928,-87.65594 +/-43317m); p97__5 (tier 4, 41.75928,-87.65594 +/-43317m); p98 (tier 4, 41.75928,-87.65594 +/-43317m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0001","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1189.6,7.5 1189.9,52.9 1319.1,52.2 1437.0,178.4 1437.0,1053.2 1196.2,1055.0 1202.4,2055.2 -0.0,2062.6 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[582.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6103468,41.7621425]}},{"type":"Feature","properties":{"resourceCoords":[582.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6104317,41.7657953]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"17"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0010","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2056.3 -0.0,-0.0 1437.0,0.0 1437.0,2126.0 1312.2,2126.0 1318.6,2067.0 -0.0,2056.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1196.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.58588,41.7642376]}},{"type":"Feature","properties":{"resourceCoords":[1196.0,2066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5858345,41.7624105]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p100","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0100","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"52.2,1988.8 52.6,507.4 -0.0,507.4 -0.0,-0.0 1435.0,0.0 1432.8,1991.6 52.2,1988.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1042.0,1058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080465,41.7807258]}},{"type":"Feature","properties":{"resourceCoords":[1042.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7081013,41.7825445]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p101","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"24"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0101","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1371.3,0.0 1389.8,2126.0 -0.0,2126.0 -0.0,-0.0 1371.3,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[444.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7126592,41.7760855]}},{"type":"Feature","properties":{"resourceCoords":[1381.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7103672,41.7770287]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p102","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0102","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"59.6,2126.0 60.1,0.0 1434.9,0.0 1435.0,2126.0 59.6,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1046.0,1066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7079411,41.7770713]}},{"type":"Feature","properties":{"resourceCoords":[1046.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7079911,41.7788923]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0103__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p103 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2488.0"},{"label":"split_canvas_w","value":"2627.2"},{"label":"split_canvas_h","value":"2767.6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0103__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0103","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,622.0 0.0,1312.1 656.8,1313.9 656.6,1054.6 656.3,622.0 0.0,622.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0103__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,622.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6791981245996,41.790804383927835]}},{"type":"Feature","properties":{"resourceCoords":[656.8,622.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6775875708436,41.790828806819924]}},{"type":"Feature","properties":{"resourceCoords":[656.8,1313.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67755297125801,41.789563962285555]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1313.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.679163525014,41.789539539393466]}},{"type":"Feature","properties":{"resourceCoords":[543.8,947.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6778483,41.7902296]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p104","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0104","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,-0.0 1435.0,2126.0 -0.0,2126.0 -0.0,0.0 1435.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0104/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68473679611594,41.823366648479485]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68462525023371,41.8207377325147]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68981503916486,41.82061370921856]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68992658504709,41.82324262518335]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0105__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p105 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5740.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0105__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0105","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"622.0,4.2 618.7,214.6 617.9,428.0 612.6,1801.3 0.0,1793.8 -0.0,2126.0 1288.2,2108.8 1288.4,8.7 622.0,4.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0105__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1136.0,1118.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6883647,41.8174583]}},{"type":"Feature","properties":{"resourceCoords":[644.0,1118.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6895807,41.81744]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p106","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0106","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1433.0,0.0 1433.0,2126.0 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[343.0,1123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6871509,41.8174765]}},{"type":"Feature","properties":{"resourceCoords":[1355.0,1123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6846802,41.8175135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0011","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 37.2,0.0 36.8,52.1 1242.5,54.3 1225.6,2113.7 -0.0,2126.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[110.0,2050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6114688,41.7584741]}},{"type":"Feature","properties":{"resourceCoords":[1104.0,54.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6091557,41.7621634]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0012","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1280.4,2126.0 -0.0,2126.0 -0.0,61.3 1363.1,52.5 1363.3,2054.5 1280.3,2055.0 1280.4,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[366.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6078374,41.7585391]}},{"type":"Feature","properties":{"resourceCoords":[366.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6079209,41.7621849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p120","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0120","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 0.0,-0.0 1433.0,0.0 1433.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[859.0,1329.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7055952,41.7243514]}},{"type":"Feature","properties":{"resourceCoords":[356.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.70688,41.7261647]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p121","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0121","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1433.0,2126.0 -0.0,2126.0 -0.0,-0.0 1433.0,0.0 1433.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0121/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81089439365881,41.79532521284663]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80741143185081,41.795352825693584]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80735686910865,41.79147312833574]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81083983091665,41.79144551548878]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p123","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0123/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0123","type":"ImageService3","width":1423,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.0,2126.0 -0.0,2126.0 -0.0,-0.0 1423.0,0.0 1423.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[710.0,1006.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8681322,41.7389584]}},{"type":"Feature","properties":{"resourceCoords":[132.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.868156,41.737131]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0125__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 | 1897 | sanborn01790_010 p125 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3662.8"},{"label":"split_canvas_w","value":"5700.0"},{"label":"split_canvas_h","value":"4841.2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0125__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0125","type":"ImageService3","width":1425,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1425.0,916.0 0.0,915.7 -0.0,2126.0 1425.0,2126.0 1425.0,916.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0125__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[316.0,1422.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9948245,41.6705153]}},{"type":"Feature","properties":{"resourceCoords":[814.0,1824.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.993591,41.6698197]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0126__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p126 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2027.2"},{"label":"split_canvas_w","value":"2081.6"},{"label":"split_canvas_h","value":"2986.8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0126__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0126","type":"ImageService3","width":1425,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1253.1 517.8,1253.5 520.4,508.1 0.0,506.8 0.0,1253.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0126__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,506.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83990809358279,42.12333561819233]}},{"type":"Feature","properties":{"resourceCoords":[520.4,506.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83989356285352,42.124284843062306]}},{"type":"Feature","properties":{"resourceCoords":[520.4,1253.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.83805967276133,42.12426928054943]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1253.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8380742034906,42.12332005567945]}},{"type":"Feature","properties":{"resourceCoords":[483.4,881.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8389752,42.1242095]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p127","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0127","type":"ImageService3","width":1425,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1425.0,2126.0 -0.0,2126.0 -0.0,246.5 569.9,259.2 590.0,96.9 1425.0,157.6 1425.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1108.0,1507.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0029479,41.672574]}},{"type":"Feature","properties":{"resourceCoords":[814.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0001845,41.6740763]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p128","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0128","type":"ImageService3","width":1425,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1368.0,1627.8 1317.6,1787.7 1319.4,2009.8 798.9,1960.6 782.2,2126.0 -0.0,2126.0 -0.0,0.0 1425.0,-0.0 1425.0,43.2 1365.8,44.1 1368.0,1627.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[885.0,1296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9987453,41.6748027]}},{"type":"Feature","properties":{"resourceCoords":[799.0,1961.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0003045,41.6744842]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p129","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"18"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0129/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0129","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1424.0,2126.0 -0.0,2126.0 76.7,2106.6 71.8,75.0 1120.0,73.5 1120.3,-0.0 1424.0,-0.0 1424.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0129/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[288.0,850.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0010843,41.6721419]}},{"type":"Feature","properties":{"resourceCoords":[288.0,2071.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0037378,41.6712684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p13","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0013","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"207.0,2048.0 202.8,60.5 861.6,60.4 933.7,135.7 997.1,135.7 997.1,201.9 1203.2,417.2 1208.3,2049.5 207.0,2048.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,1053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6054351,41.7604071]}},{"type":"Feature","properties":{"resourceCoords":[207.0,2048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6053983,41.7585819]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p130","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0130","type":"ImageService3","width":1426,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.9,1982.2 53.5,1758.2 107.2,1576.7 128.8,-0.0 1426.0,-0.0 1426.0,1974.5 51.9,1982.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[600.0,1980.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9993997,41.672695]}},{"type":"Feature","properties":{"resourceCoords":[130.0,120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.9957731,41.6747868]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p14","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0014","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,204.8 -0.0,41.3 1437.0,47.5 1437.0,2082.2 214.3,2079.1 209.7,418.4 -0.0,204.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[709.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.601771,41.7604487]}},{"type":"Feature","properties":{"resourceCoords":[211.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.602977,41.760435]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0015","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1336.5,2051.8 569.8,2050.7 575.0,71.5 1332.5,66.0 1336.5,2051.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0015/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60145901836569,41.76239522286728]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59793341653936,41.762442890475725]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59783953622122,41.75852461417747]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60136513804754,41.758476946569026]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p16","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0016","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.5,70.0 999.9,73.9 1011.8,2059.8 233.1,2052.7 224.5,70.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1214.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5956955,41.7605148]}},{"type":"Feature","properties":{"resourceCoords":[224.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5981868,41.7623178]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0017","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,49.3 206.2,51.7 206.4,110.4 1209.4,109.8 1202.1,2056.8 -0.0,2053.4 -0.0,49.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59626674870454,41.7624229478769]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59276768688378,41.76247981584351]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59265568652775,41.75859104012604]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59615474834851,41.75853417215943]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p18","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0018","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"222.0,69.8 982.5,75.9 985.4,2060.2 222.0,2054.0 222.0,69.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[222.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5932747,41.7605317]}},{"type":"Feature","properties":{"resourceCoords":[222.0,2054.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5932313,41.7587083]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0019","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"472.1,53.6 472.1,0.0 1087.3,0.0 1087.3,59.6 1232.3,61.0 1229.5,2059.6 -0.0,2049.7 -0.0,49.1 472.1,53.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0019/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59144261779497,41.76245861959532]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58795509459947,41.76250926833428]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58785534480396,41.75863324206588]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59134286799946,41.75858259332693]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p2","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0002","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.1,1052.5 247.5,173.4 129.8,45.8 -0.0,45.6 -0.0,-0.0 1437.0,0.0 1437.0,50.3 1381.0,43.4 1372.7,2058.0 -0.0,2057.9 -0.0,1052.7 242.1,1052.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[866.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6067171,41.762206]}},{"type":"Feature","properties":{"resourceCoords":[372.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6079209,41.7621849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0020","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"235.5,2041.5 236.3,56.6 1424.0,65.9 1424.0,2126.0 1257.8,2126.0 1257.8,2049.8 235.5,2041.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58902908262927,41.762486797533626]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58554912635363,41.76253464909326]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58545402321766,41.75863180153318]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5889339794933,41.75858394997354]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p21","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0021","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,51.3 1424.0,57.6 1424.0,2050.5 1424.0,2050.5 1424.0,2126.0 -0.0,2126.0 -0.0,51.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1088.0,2049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6028405,41.7549655]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6029314,41.7586067]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0022","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"367.5,2126.0 367.4,2059.6 310.3,2059.6 310.4,2126.0 217.8,2126.0 207.8,54.8 1356.9,55.1 1367.5,2126.0 367.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.600481,41.7568077]}},{"type":"Feature","properties":{"resourceCoords":[1356.0,1059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5992723,41.7568201]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0023","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.0,2126.0 222.9,49.7 1205.0,47.9 1182.2,2126.0 223.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0023/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59067735444155,41.75913837721144]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59062573286282,41.756510540589915]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5958482338721,41.75645264337777]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59589985545084,41.7590804799993]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0024","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1206.1,1915.4 1205.5,2025.4 214.8,2023.3 230.6,-0.0 1424.0,-0.0 1424.0,1890.3 1206.1,1915.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58587411910479,41.75918796737824]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58580915304188,41.756582990713405]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59098622509438,41.75651012676222]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59105119115729,41.75911510342706]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0025","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.9,2034.3 203.4,991.5 -0.0,985.9 -0.0,14.2 814.9,61.7 988.6,2107.3 668.5,2126.0 670.6,2048.3 174.9,2034.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0025/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59596922885459,41.75692606793276]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59248981019655,41.757045453399414]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59225255664514,41.753142872010905]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59573197530317,41.75302348654425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0026","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2073.7 -0.0,3.6 1424.0,188.5 1424.0,2126.0 -0.0,2126.0 -0.0,2092.5 -0.0,2073.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59399136862017,41.756911616066205]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59054454063434,41.757258733890744]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58985471444453,41.7533927201894]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59330154243035,41.753045602364864]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0028","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,-0.0 1424.0,0.0 1424.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0028/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5894376359739,41.75516834170366]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5859876844153,41.75524321322302]}},{"type":"Feature","properties":{"resourceCoords":[1424.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5858388970259,41.751373577698146]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58928884858449,41.75129870617879]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p29","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0029","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,59.4 56.6,59.5 56.5,125.3 1047.7,127.0 1047.6,61.6 1189.8,57.3 1195.3,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[557.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6003804,41.7531587]}},{"type":"Feature","properties":{"resourceCoords":[1053.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5991215,41.7513438]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0003","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.2,509.2 200.4,49.1 258.5,55.5 258.0,5.6 1437.0,0.0 1437.0,2028.5 1019.6,2036.4 1019.8,2126.0 955.5,2126.0 882.4,2050.4 214.6,2051.5 225.2,509.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60607102327668,41.76596816790288]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60257805023087,41.766003532356834]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60250839701327,41.76212172488263]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60600137005908,41.762086360428675]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__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 | 1897 | sanborn01790_010 p30 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5696.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 518.0,2126.0 815.1,2126.0 815.2,2126.0 803.8,1050.1 1424.0,1045.7 1424.0,0.0 348.9,0.0 -0.0,39.1 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1338.0,1047.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5955262,41.7532036]}},{"type":"Feature","properties":{"resourceCoords":[1338.0,2042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5954817,41.7513822]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p30 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"3215.2"},{"label":"split_canvas_y","value":"4182.8"},{"label":"split_canvas_w","value":"2480.8"},{"label":"split_canvas_h","value":"4321.2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"864.7,2053.1 1424.0,2055.1 1424.0,1092.0 864.7,1091.7 864.7,2053.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0030__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[864.7,2053.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5954817,41.7513822]}},{"type":"Feature","properties":{"resourceCoords":[864.7,1091.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5955262,41.7532036]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p31","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0031","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1368.2,1045.5 1391.0,2021.0 26.1,2053.6 31.8,63.2 1420.2,79.6 1413.2,1046.2 1368.2,1045.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[526.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5980895,41.7586581]}},{"type":"Feature","properties":{"resourceCoords":[518.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5980033,41.7550083]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p32","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0032","type":"ImageService3","width":1424,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,65.6 677.0,66.3 676.8,0.0 1424.0,0.0 1424.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1089.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5930057,41.7495861]}},{"type":"Feature","properties":{"resourceCoords":[1089.0,2056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5929674,41.7477658]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0034","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,-0.0 1431.0,0.0 1431.0,2041.3 35.9,2058.6 40.7,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58887566564339,41.72966775154655]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58539297069252,41.729721513060106]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58528669871902,41.72583271465067]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58876939366988,41.725778953137116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0036__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 | 1897 | sanborn01790_010 p36 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5724.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0036__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0036","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,871.1 491.9,869.3 491.8,1370.9 491.6,2126.0 1431.0,2126.0 1431.0,0.0 1397.2,0.0 1391.6,80.0 -0.0,-0.0 0.0,871.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0036__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1350.0,1080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5851714,41.7241739]}},{"type":"Feature","properties":{"resourceCoords":[1350.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5853927,41.7259879]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p37","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"16"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0037","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1417.6,0.0 1417.5,2060.7 -0.0,2064.0 -0.0,0.0 1417.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[428.0,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6071618,41.7329603]}},{"type":"Feature","properties":{"resourceCoords":[428.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6072489,41.7366131]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0038","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1147.9,2046.5 40.9,2057.8 24.1,0.0 1431.0,0.0 1431.0,2126.0 1142.8,2126.0 1147.9,2046.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60487488717969,41.73677536815315]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60137772397019,41.736800960666855]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60132712891074,41.732896437645806]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60482429212024,41.7328708451321]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p39","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0039","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 0.0,0.0 236.8,0.0 236.8,61.0 1431.0,58.2 1431.0,1054.6 666.0,1057.0 666.0,1509.6 666.0,1553.0 1431.0,1554.7 1431.0,2053.2 467.4,2055.4 467.2,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[666.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6070749,41.7293144]}},{"type":"Feature","properties":{"resourceCoords":[666.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6071618,41.7329603]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0004","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1281.3,2056.9 489.6,2042.4 498.3,0.0 1059.8,0.0 1059.4,83.2 1283.3,83.8 1281.3,2056.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60377247115399,41.76596301111386]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60032647020859,41.7660089547062]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6002359801561,41.76217936289371]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6036819811015,41.76213341930137]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0040","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"559.4,2126.0 559.4,2061.4 110.5,2063.9 109.1,1564.7 337.2,1564.3 334.4,1062.5 107.7,1063.8 104.9,65.8 1431.0,58.9 1431.0,2126.0 559.4,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1251.0,1057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.602439,41.7312109]}},{"type":"Feature","properties":{"resourceCoords":[1065.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6028583,41.7293793]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0041","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1390.0,2126.0 -0.0,2126.0 -0.0,1756.3 380.3,1757.5 378.2,529.2 -0.0,527.2 -0.0,0.0 99.1,-0.0 99.8,150.2 377.6,148.9 377.4,66.9 1383.8,256.3 1390.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60279804794138,41.728256707249486]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.602726020916,41.72565408759659]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6078706296671,41.72557366074186]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60794265669249,41.728176280394756]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p42","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0042","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,697.5 80.7,276.0 -0.0,275.8 -0.0,-0.0 1431.0,0.0 1431.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[870.0,1281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6009361,41.7257631]}},{"type":"Feature","properties":{"resourceCoords":[81.0,276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6029409,41.7275677]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p43","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0043","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"654.3,0.0 654.5,76.0 1431.0,71.2 1431.0,2126.0 -0.0,2126.0 -0.0,0.0 654.3,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[524.0,1052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6081491,41.7238606]}},{"type":"Feature","properties":{"resourceCoords":[1015.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6069881,41.7256712]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0044","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"465.2,2122.9 343.0,109.6 1412.0,38.6 1431.0,0.0 1431.0,2126.0 465.2,2122.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0044/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60679364012621,41.72591045263235]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60329826715463,41.72579963858299]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60351730353578,41.721896451695955]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60701267650737,41.72200726574531]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p45","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0045","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 1244.9,0.0 1245.1,46.8 1431.0,46.4 1431.0,1052.0 1249.3,1052.5 1253.5,2056.4 -0.0,2057.6 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1072.0,1053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6468006,41.7633519]}},{"type":"Feature","properties":{"resourceCoords":[575.0,2057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6479637,41.7615186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0046","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"179.8,1061.8 184.0,66.7 -0.0,66.3 -0.0,-0.0 1325.3,0.0 1325.2,65.3 1380.5,65.5 1367.2,2059.0 1309.2,2058.8 1309.0,2120.2 886.8,2126.0 887.0,2057.8 -0.0,2054.9 -0.0,1061.5 179.8,1061.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[324.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.645574,41.7633711]}},{"type":"Feature","properties":{"resourceCoords":[324.0,67.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6456291,41.7651905]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p47","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"13"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0047","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.4,2064.2 134.6,64.9 79.2,65.2 78.9,0.0 1226.7,0.0 1227.1,60.5 1339.7,60.1 1337.8,2059.8 1205.6,2060.3 1205.5,2126.0 75.5,2126.0 75.2,2064.4 133.4,2064.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[134.0,1066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6429956,41.7634114]}},{"type":"Feature","properties":{"resourceCoords":[742.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6414663,41.7616135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0048","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"113.2,61.0 -0.0,60.7 -0.0,-0.0 1317.5,0.0 1318.9,19.9 1431.0,18.9 1431.0,2126.0 -0.0,2126.0 -0.0,2053.0 98.4,2053.3 113.2,61.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0048/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64036247682866,41.76538880479323]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.636876194756,41.76544927747535]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63675659010862,41.761558638334776]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64024287218128,41.76149816565266]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0049","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.8,2126.0 177.3,0.0 1236.5,0.0 1201.5,2054.8 1415.4,2057.6 1414.8,2126.0 152.8,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0049/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63730555447353,41.76540421253148]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63383092451444,41.76548917809982]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63366287707159,41.76161154359491]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63713750703067,41.76152657802657]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0005","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"222.7,90.2 -0.0,90.5 0.0,-0.0 1437.0,0.0 1437.0,88.5 1224.5,88.8 1232.2,1049.5 1027.1,1049.3 1030.8,2055.5 463.1,2065.0 228.2,2052.6 222.7,90.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0005/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60123142236995,41.76601078551249]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59776655713529,41.766047104342725]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5976950238986,41.76219654955103]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60115988913326,41.762160230720795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p50","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0050","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 1343.3,0.0 1348.0,2047.0 -0.0,2056.2 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[854.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6321674,41.7635797]}},{"type":"Feature","properties":{"resourceCoords":[854.0,2052.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6321298,41.7617595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p51","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0051","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"126.9,2064.8 132.7,0.0 1226.2,0.0 1215.2,2064.7 126.9,2064.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[636.0,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6297216,41.7636178]}},{"type":"Feature","properties":{"resourceCoords":[636.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6297717,41.765439]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p52","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"16"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0052","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2068.3 -0.0,-0.0 1431.0,0.0 1431.0,2126.0 159.1,2126.0 159.2,2067.6 -0.0,2068.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[721.0,1076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6265109,41.7636678]}},{"type":"Feature","properties":{"resourceCoords":[67.0,2068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62809,41.7618258]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p53","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0053","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 0.0,-0.0 483.1,0.0 483.1,68.4 1431.0,67.8 1431.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1050.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.647918,41.7596943]}},{"type":"Feature","properties":{"resourceCoords":[1050.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6479637,41.7615186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p54","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0054","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1431.0,67.5 1431.0,1988.8 1366.5,1990.1 1359.1,2126.0 253.5,2126.0 257.6,65.8 1431.0,67.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[369.0,1807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6466619,41.7583454]}},{"type":"Feature","properties":{"resourceCoords":[369.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6467503,41.7615359]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p55","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0055","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1341.8,2051.0 -0.0,2045.7 -0.0,70.4 34.1,70.2 34.8,143.3 1431.0,131.1 1431.0,1053.3 1357.5,1054.0 1341.8,2051.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[737.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6384841,41.7598393]}},{"type":"Feature","properties":{"resourceCoords":[737.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6384485,41.7580185]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p56","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0056","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"163.7,1056.7 171.8,138.9 189.8,138.9 189.8,151.3 1431.0,139.7 1431.0,1060.2 1223.7,1058.9 1217.2,1981.4 67.7,1981.8 90.5,1056.7 163.7,1056.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1073.0,1058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6345331,41.7599068]}},{"type":"Feature","properties":{"resourceCoords":[1073.0,2050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6344757,41.758083]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p57","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0057","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1066.3 209.3,1066.2 202.3,68.5 1171.6,62.4 1165.4,2060.7 -0.0,2067.1 -0.0,1066.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[345.0,1066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.633317,41.7599226]}},{"type":"Feature","properties":{"resourceCoords":[345.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6333571,41.7617405]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p58","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0058","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2086.9 -0.0,1960.6 -0.0,1960.4 -0.0,73.1 1431.0,62.5 1431.0,2126.0 56.4,2126.0 55.9,2086.6 -0.0,2086.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1338.0,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6280544,41.7600093]}},{"type":"Feature","properties":{"resourceCoords":[172.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6309175,41.7617825]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p59","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0059","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.3,1053.4 -0.0,1053.3 -0.0,-0.0 1431.0,23.4 1431.0,2126.0 1329.5,2126.0 1329.8,2060.8 67.3,2061.2 71.3,1053.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[568.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6416927,41.7543057]}},{"type":"Feature","properties":{"resourceCoords":[73.0,90.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6429983,41.7578439]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0006","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"205.0,1041.8 200.9,81.5 413.3,81.0 413.6,0.0 974.8,0.0 975.2,79.8 1203.5,79.2 1208.4,2055.6 -0.0,2046.8 -0.0,1041.0 205.0,1041.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59876394358788,41.766022078104186]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59529802276039,41.76606797875304]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59520761722736,41.76221625230519]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59867353805485,41.76217035165633]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p60","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0060","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1212.7,2044.5 1188.5,2126.0 883.4,2126.0 895.0,2064.0 838.1,2024.1 785.5,2052.8 791.7,2126.0 433.1,2120.2 424.5,3.1 1431.0,10.5 1431.0,1040.1 1431.0,1045.2 1431.0,2043.5 1212.7,2044.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[331.0,1042.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6398896,41.7561526]}},{"type":"Feature","properties":{"resourceCoords":[331.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6398457,41.7543364]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p61","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0061","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"91.5,67.0 206.9,67.4 224.9,0.0 1381.6,0.0 1381.1,69.3 1236.5,69.0 1222.4,2062.4 80.0,2061.4 91.5,67.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[730.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6356023,41.7544198]}},{"type":"Feature","properties":{"resourceCoords":[1236.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6344757,41.758083]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p62","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0062","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"58.2,2046.7 78.0,66.0 1431.0,72.7 1431.0,2126.0 400.2,2126.0 400.7,2048.0 58.2,2046.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[718.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6328295,41.7562776]}},{"type":"Feature","properties":{"resourceCoords":[78.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6344757,41.758083]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__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 | 1897 | sanborn01790_010 p63 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2296.4"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"525.1,2063.0 547.8,1075.0 477.9,1073.6 497.6,40.9 573.3,42.3 573.3,0.0 87.5,0.0 72.5,135.0 -0.0,133.5 0.0,1325.0 -0.0,2047.6 525.1,2063.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[50.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6441817,41.7560855]}},{"type":"Feature","properties":{"resourceCoords":[525.1,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6429065,41.7542855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p63 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"2293.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3430.8"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1277.5,72.5 610.9,64.2 610.0,0.0 573.3,-0.0 574.1,2059.0 1261.2,2064.1 1277.5,72.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0063__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[632.3,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6440876,41.7524446]}},{"type":"Feature","properties":{"resourceCoords":[1124.1,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6428179,41.750654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p64","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0064","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2059.7 -0.0,69.5 1112.0,65.1 1112.0,129.6 1132.4,134.8 1137.1,2054.3 1111.4,2054.4 1111.4,2058.8 -0.0,2059.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[858.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6404236,41.752512]}},{"type":"Feature","properties":{"resourceCoords":[858.0,2059.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6403787,41.7506886]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0065","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1222.7,2080.3 -0.0,2089.5 -0.0,156.0 436.8,157.3 430.8,85.3 483.2,57.2 539.6,96.6 515.5,168.8 830.8,158.6 855.1,78.5 1226.4,77.8 1222.7,2080.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0065/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6398004198869,41.754493924982015]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63633050972602,41.75454861713707]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63622235633534,41.75067559142237]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63969226649621,41.75062089926732]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p66","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0066","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1331.5,2126.0 1331.8,2061.2 98.4,2059.3 99.9,67.6 1431.0,63.3 1431.0,2126.0 1331.5,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1349.0,995.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6337043,41.7527446]}},{"type":"Feature","properties":{"resourceCoords":[596.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6356023,41.7544198]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p67","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0067","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1238.7,2067.0 -0.0,2058.4 -0.0,-0.0 191.4,0.0 188.2,68.4 1238.2,71.5 1238.7,2067.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[742.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6427638,41.7488388]}},{"type":"Feature","properties":{"resourceCoords":[742.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6428179,41.750654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p68","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0068","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1179.0,2058.0 197.1,2063.8 172.0,69.5 1431.0,50.7 1431.0,1058.3 1136.2,1060.7 1179.0,2058.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[670.0,65.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6403787,41.7506886]}},{"type":"Feature","properties":{"resourceCoords":[1179.0,2058.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6390811,41.7470555]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p69","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0069","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.0,2063.0 209.4,1068.6 503.3,1068.3 510.5,64.0 1431.0,63.9 1431.0,2051.8 245.0,2063.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6390811,41.7470555]}},{"type":"Feature","properties":{"resourceCoords":[744.0,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6379362,41.7507357]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p7","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"15"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0007","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1437.0,65.2 1030.1,59.4 1021.1,2076.5 1224.3,2078.9 1224.1,2126.0 221.2,2126.0 226.1,92.0 -0.0,91.4 -0.0,-0.0 1437.0,0.0 1437.0,65.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[226.0,1565.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5957773,41.7632464]}},{"type":"Feature","properties":{"resourceCoords":[226.0,557.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5958326,41.7650739]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0070","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1431.0,2064.1 385.5,2074.2 380.5,75.3 1431.0,71.8 1431.0,2064.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63717082766894,41.7508845853195]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63369804062485,41.75092286234771]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6336223522974,41.74704640768288]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63709513934148,41.74700813065467]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p71","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0071","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"852.1,2041.7 1346.0,2041.8 1430.2,2055.4 1431.0,2126.0 -0.0,2126.0 -0.0,80.1 852.5,76.7 852.1,2041.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[642.0,2062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6426244,41.7433713]}},{"type":"Feature","properties":{"resourceCoords":[139.0,79.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6439324,41.7470001]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p72","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"2"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0072","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"583.4,2074.9 -0.0,2061.2 -0.0,78.0 1265.0,77.0 1265.0,2066.0 1194.9,2066.9 1194.8,2119.1 615.4,2126.0 583.4,2074.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1265.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6390811,41.7470555]}},{"type":"Feature","properties":{"resourceCoords":[1265.0,2066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6390151,41.7434363]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p73","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0073","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1317.6,1747.9 1070.0,2126.0 -0.0,2126.0 -0.0,2074.2 70.3,2073.1 64.4,96.8 1431.0,75.8 1431.0,1236.5 1317.6,1747.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0073/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6392405377629,41.74723143998206]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63575271670469,41.74725950780601]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63569721907697,41.7433660473074]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63918504013519,41.74333797948345]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p74","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0074","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"569.8,1708.5 676.7,1179.7 669.0,62.4 903.6,57.5 903.8,56.8 1431.0,46.4 1431.0,2126.0 260.4,2126.0 388.7,1991.1 569.8,1708.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[713.0,1022.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6356325,41.7453348]}},{"type":"Feature","properties":{"resourceCoords":[1318.0,2007.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6341106,41.7435057]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0075","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"982.9,1759.4 892.2,2069.7 -0.0,2079.2 -0.0,0.0 1217.2,0.0 1053.1,85.7 1431.0,83.4 1431.0,1460.0 982.9,1759.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0075/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6473955564082,41.73982296282373]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6439189565633,41.739849841221115]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64386581685113,41.73596846150328]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64734241669603,41.7359415831059]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p76","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0076","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"337.9,1945.5 337.9,1945.5 208.6,1846.5 -0.0,2122.7 -0.0,0.0 1431.0,-0.0 1431.0,1505.4 1390.2,2126.0 573.9,2126.0 337.9,1945.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1225.0,82.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6392962,41.740184]}},{"type":"Feature","properties":{"resourceCoords":[1380.0,2614.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6436506,41.7373153]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p77","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0077","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"543.4,0.0 542.6,60.9 1431.0,62.1 1222.6,760.2 1203.7,1009.5 1431.0,1028.3 1431.0,2126.0 -0.0,2126.0 -0.0,-0.0 543.4,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1062.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6460799,41.7360481]}},{"type":"Feature","properties":{"resourceCoords":[68.0,61.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6484983,41.7360073]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p78","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0078","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1794.6 298.2,781.3 747.8,481.3 750.2,0.0 1111.4,0.0 1342.0,371.0 1352.7,2071.3 1431.0,2071.8 1431.0,2126.0 211.2,2126.0 210.8,2067.6 -0.0,2072.3 -0.0,1794.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,96.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6444975,41.7378745]}},{"type":"Feature","properties":{"resourceCoords":[1347.0,1099.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6424037,41.7360834]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p79","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0079","type":"ImageService3","width":1431,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"260.8,483.4 116.2,278.2 518.1,0.0 1431.0,0.0 1431.0,49.1 1233.3,47.5 1224.2,2126.0 254.9,2117.0 260.8,483.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0079/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6431267975195,41.73829784438289]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63954209005415,41.73836604431519]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63940725931839,41.73436386989146]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64299196678374,41.73429566995916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p8","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0008","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"404.5,0.0 1437.0,0.0 1437.0,2078.1 -0.0,2066.3 -0.0,60.0 404.8,63.9 404.5,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[197.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5933752,41.7641852]}},{"type":"Feature","properties":{"resourceCoords":[197.0,562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5933974,41.7651003]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0080","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2092.6 213.2,2094.8 206.1,0.0 1433.0,0.0 1433.0,2126.0 -0.0,2126.0 -0.0,2092.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0080/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.640548641844,41.73826033207418]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63697188369866,41.7383075439237]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63687867652119,41.734319817353764]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.64045543466653,41.73427260550424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0082__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 | 1897 | sanborn01790_010 p82 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5732.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0082__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0082","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1433.0,672.9 1043.8,666.5 1049.2,0.0 -0.0,-0.0 -0.0,2126.0 1433.0,2126.0 1433.0,672.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0082__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63657017118146,41.73102657681547]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63332858235921,41.7320357470207]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6313176964481,41.72845503780254]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63455928527034,41.727445867597304]}},{"type":"Feature","properties":{"resourceCoords":[1050.0,1395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6328755,41.7294165]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0083","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,-0.0 1353.5,0.0 1362.4,1614.8 1187.3,1617.4 1433.0,2028.8 1433.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6711958681273,41.73496519250278]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66771418744298,41.73500866496793]}},{"type":"Feature","properties":{"resourceCoords":[1433.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66762836702208,41.73112674385548]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67111004770639,41.731083271390325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p84","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0084","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"253.6,1626.7 238.2,10.0 1231.5,6.3 1248.2,2117.8 325.7,2126.0 325.4,2040.8 80.0,1630.0 253.6,1626.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[80.0,1630.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6682458,41.732048]}},{"type":"Feature","properties":{"resourceCoords":[744.0,610.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6666503,41.7339234]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p85","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0085","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.4,2126.0 90.2,0.0 1433.0,0.0 1433.0,2126.0 90.4,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[592.0,604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6642239,41.7339599]}},{"type":"Feature","properties":{"resourceCoords":[90.0,604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6654451,41.7339415]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p86","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0086","type":"ImageService3","width":1433,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1433.0,2126.0 -0.0,2126.0 -0.0,-0.0 1433.0,0.0 1433.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1343.0,2063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6556239,41.7304326]}},{"type":"Feature","properties":{"resourceCoords":[842.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6569332,41.7340573]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0087__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 | 1897 | sanborn01790_010 p87 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5185.6"},{"label":"split_canvas_w","value":"2410.0"},{"label":"split_canvas_h","value":"3318.4"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0087__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0087","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2126.0 602.5,2126.0 600.7,1296.4 0.0,1297.2 0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0087__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1296.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70149557468457,41.895764701330585]}},{"type":"Feature","properties":{"resourceCoords":[602.5,1296.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70027932782058,41.89638737886166]}},{"type":"Feature","properties":{"resourceCoords":[602.5,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69912627092454,41.89513885343029]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70034251778853,41.89451617589921]}},{"type":"Feature","properties":{"resourceCoords":[493.4,1728.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6998994,41.8956248]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0088","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2126.0 -0.0,0.0 1435.0,-0.0 1435.0,2126.0 -0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0088/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71338370885256,41.80074040975057]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7133366353105,41.79809882865236]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7185495898552,41.79804647106733]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71859666339726,41.80068805216554]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p89","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0089","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,2126.0 -0.0,2126.0 -0.0,-0.0 1379.0,0.0 1381.0,2026.2 1435.0,2026.2 1435.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0089/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71325286308944,41.80074159577335]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70975456639488,41.80079531873048]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70964854926912,41.79690430071122]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71314684596368,41.79685057775409]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0009","type":"ImageService3","width":1437,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1689.0 -0.0,1504.5 -0.0,1068.5 199.9,61.4 1209.0,56.4 1437.0,1062.2 1437.0,1918.3 1437.0,2061.2 204.4,2069.6 -0.0,1689.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6076028472398,41.73124382729314]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60413752724101,41.73128468601604]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6040570989926,41.727431388820605]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6075224189914,41.72739053009771]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p90","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0090","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"53.1,2126.0 53.2,2053.8 -0.0,2053.8 -0.0,-0.0 1435.0,0.0 1435.0,2126.0 53.1,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[494.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7086153,41.7989308]}},{"type":"Feature","properties":{"resourceCoords":[494.0,68.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7086675,41.8007615]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p91","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0091","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1435.0,2053.7 25.0,2059.0 25.4,2126.0 -0.0,2126.0 -0.0,-0.0 1302.8,0.0 1325.4,1629.0 1435.0,1628.7 1435.0,2053.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1323.0,1053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6842947,41.8029763]}},{"type":"Feature","properties":{"resourceCoords":[341.0,2056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6866796,41.8011147]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p92","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0092","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,80.5 1419.7,82.8 1435.0,0.0 1435.0,2126.0 -0.0,2126.0 -0.0,80.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0092/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68746082306268,41.801249405503015]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68395311181423,41.80129743531733]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68385832885367,41.7973959750219]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68736604010212,41.797347945207584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p93","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0093","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,489.1 -0.0,-0.0 1225.7,8.2 1224.3,537.8 1151.4,545.8 1156.2,1554.0 1236.3,1554.2 1235.4,2065.1 464.4,2065.2 464.2,2126.0 228.1,2126.0 209.3,489.7 -0.0,489.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0093/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68490552445448,41.80579309829588]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68141793561868,41.805834094312026]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68133702750846,41.801955292453144]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68482461634426,41.801914296437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p94","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0094","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1189.9,2059.9 1189.2,2126.0 75.5,2126.0 79.3,1545.3 -0.0,1544.8 -0.0,537.1 72.3,529.4 76.2,0.0 1435.0,0.0 1435.0,2062.2 1189.9,2059.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[76.0,2056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6818245,41.8020607]}},{"type":"Feature","properties":{"resourceCoords":[76.0,58.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6819239,41.8057074]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p95","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0095","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1394.7,2057.8 1435.0,2055.5 1435.0,2126.0 426.6,2126.0 295.0,283.9 418.0,276.3 414.5,216.1 1172.0,169.0 1176.2,238.4 1289.7,230.8 1394.7,2057.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[279.0,1692.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6842004,41.7993397]}},{"type":"Feature","properties":{"resourceCoords":[1172.0,169.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6818245,41.8020607]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p96","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0096","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1270.2,168.1 1268.7,0.0 1435.0,0.0 1435.0,2126.0 -0.0,2126.0 -0.0,244.8 1020.0,235.5 1020.0,168.0 1270.2,168.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1020.0,679.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6790799,41.8011812]}},{"type":"Feature","properties":{"resourceCoords":[1020.0,168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6790937,41.8020949]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1897 | sanborn01790_010 p99","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"}],"created":"2026-09-24T16:45:21Z","modified":"2026-09-24T16:45:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0099","type":"ImageService3","width":1435,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1335.4,0.0 1336.8,1497.7 -0.0,1485.7 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901897D:01790_D_1897-0099/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7137446,41.7816394]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7102588,41.7816934]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7101516,41.7778424]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2126.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7136374,41.7777884]}}]}}]}