{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01790_128.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1950 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"95"},{"label":"placed","value":"91"},{"label":"unplaced","value":"4"},{"label":"fit sources","value":"georef 57, georef-snap 33, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"3 sheet(s) cut into 6 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 41.98987,-87.78485 +/-3490m); p16__1 (tier 1, 41.97837,-87.75902 +/-101m); p56__2 (tier 2, 41.99431,-87.78227 +/-122m); p59__2 (tier 1, 41.99872,-87.76707 +/-100m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0001/info.json","type":"ImageService2","height":8388,"width":5748},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,424.5 5000.5,445.4 4797.6,8388.0 3395.2,7361.6 575.3,7322.5 560.5,8388.0 -0.0,8388.0 -0.0,424.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2916.0,4396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7768781,41.9810942]}},{"type":"Feature","properties":{"resourceCoords":[4900.0,4396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7756545,41.981102]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p10","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0010/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4381.4,8388.0 2785.7,8388.0 2788.1,8093.1 836.0,8106.0 871.4,0.0 3096.5,0.0 4773.6,1231.6 5744.0,1195.2 5744.0,7385.5 5550.8,7200.5 4381.4,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2820.0,4136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7647136,41.9811371]}},{"type":"Feature","properties":{"resourceCoords":[836.0,8104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7659561,41.9793203]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0011/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1401.3,7303.0 1346.7,1032.1 5744.0,982.1 5744.0,4753.1 2396.3,8232.1 1401.3,7303.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76370011714694,41.98295562444574]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76022267352049,41.98291526278351]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76030140648221,41.97911371429422]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76377885010866,41.97915407595645]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0012/info.json","type":"ImageService2","height":8388,"width":5732},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5368.2,150.3 5274.7,8388.0 467.5,8388.0 1366.4,7492.8 1372.4,2367.2 1140.7,2130.5 1375.3,1900.6 1385.6,213.4 5368.2,150.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76354529450448,41.98023503797687]}},{"type":"Feature","properties":{"resourceCoords":[5732.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76107211555042,41.978395831531124]}},{"type":"Feature","properties":{"resourceCoords":[5732.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76466716666475,41.97568635475401]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76714034561881,41.977525561199755]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p13","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0013/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"733.9,7243.8 672.1,1280.7 981.1,1283.1 969.1,-0.0 1300.2,-0.0 4956.9,3563.0 4988.0,7268.0 733.9,7243.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[712.0,5264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7671911,41.9793149]}},{"type":"Feature","properties":{"resourceCoords":[4988.0,7268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7684378,41.9773741]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p14","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"18"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0014/info.json","type":"ImageService2","height":8388,"width":5752},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5752.0,8388.0 4964.2,8388.0 4968.7,7204.8 2424.8,7200.2 1656.5,7739.3 1651.7,7198.6 396.2,7196.3 366.4,4759.3 3703.9,1350.6 3995.8,1737.7 4031.7,3309.8 4617.1,3294.1 5274.9,2824.5 5197.3,-0.0 5752.0,-0.0 5752.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[372.0,5224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7672245,41.9773753]}},{"type":"Feature","properties":{"resourceCoords":[4096.0,7204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7684674,41.9756831]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p15","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0015/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0015/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5744.0,1509.0 5744.0,5706.5 5290.4,5694.3 5289.8,5738.2 5291.9,8016.7 4741.2,8388.0 4259.8,8388.0 4232.5,6965.8 1421.6,4032.6 4125.3,1339.8 3698.3,662.2 5292.0,640.0 5292.0,1947.1 5744.0,1509.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5292.0,3976.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7627569,41.975158]}},{"type":"Feature","properties":{"resourceCoords":[5292.0,640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7602615,41.9751874]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0016__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 | 1950 | sanborn01790_128 p16 [2]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"16"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5752.0"},{"label":"split_canvas_h","value":"8388.0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0016__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0016/info.json","type":"ImageService2","height":8388,"width":5752},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5040.5,595.4 5040.6,206.0 5752.0,206.2 5752.0,-0.0 -0.0,0.0 0.0,5630.8 1617.2,5638.4 2832.4,5967.2 2834.4,8388.0 5070.8,8388.0 5688.8,7673.0 5053.2,7665.2 5067.3,6490.0 5165.3,6491.4 5188.0,596.0 5040.5,595.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0016__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2328.0,5268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7539597,41.9815032]}},{"type":"Feature","properties":{"resourceCoords":[5188.0,596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.748117,41.9789898]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p17","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0017/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,5417.8 1142.5,6525.1 2473.2,5113.3 1519.2,4912.5 1456.0,268.0 5028.2,268.1 5120.4,5688.9 4776.7,5619.7 2599.8,7937.6 3064.5,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3340.0,268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7620273,41.9779185]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7628462,41.9773097]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p18","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0018/info.json","type":"ImageService2","height":8388,"width":5752},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4406.8,6290.4 2373.8,8388.0 2107.8,8388.0 1786.4,8065.7 524.1,7754.0 451.4,349.4 569.3,349.9 448.6,0.0 5752.0,0.0 5752.0,5268.5 5261.9,5775.9 5300.6,6208.1 4406.8,6290.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[504.0,4336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7604035,41.9778331]}},{"type":"Feature","properties":{"resourceCoords":[4776.0,368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7602946,41.9804994]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p19","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0019/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"984.5,8246.1 906.5,5055.3 2318.9,4187.1 2968.0,4188.0 2918.9,1063.8 3495.3,370.1 4620.3,1308.1 4657.1,8388.0 1484.4,8388.0 1634.1,8240.5 984.5,8246.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2968.0,4188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7578167,41.9770557]}},{"type":"Feature","properties":{"resourceCoords":[12744.0,8144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7518113,41.975287]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p2","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0002/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1084.6,8388.0 1100.0,348.0 5074.3,265.4 5082.4,8388.0 1084.6,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5084.0,3064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7732147,41.9816585]}},{"type":"Feature","properties":{"resourceCoords":[1100.0,348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7756134,41.9829129]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0020/info.json","type":"ImageService2","height":8388,"width":5752},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,-0.0 2373.9,0.0 2373.4,196.5 5752.0,157.5 5752.0,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75682699838474,41.978953784914395]}},{"type":"Feature","properties":{"resourceCoords":[5752.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75331896953776,41.97898657053961]}},{"type":"Feature","properties":{"resourceCoords":[5752.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7532551080159,41.97515667921289]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75676313686289,41.97512389358767]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p21","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0021/info.json","type":"ImageService2","height":8388,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5688.0,193.2 5688.0,8388.0 1070.5,8388.0 1089.9,218.5 5688.0,193.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[420.0,2484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7537116,41.9778684]}},{"type":"Feature","properties":{"resourceCoords":[5288.0,8140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7506477,41.9753008]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p22","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0022/info.json","type":"ImageService2","height":8388,"width":5752},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4980.0,292.0 4981.1,0.0 5752.0,0.0 5752.0,8388.0 1115.7,8388.0 1193.7,269.5 4980.0,292.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[720.0,8168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7506477,41.9753008]}},{"type":"Feature","properties":{"resourceCoords":[4980.0,292.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.748117,41.9789898]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p23","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0023/info.json","type":"ImageService2","height":8388,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5688.0,-0.0 5688.0,2136.2 4524.0,5393.8 5052.7,6244.7 4529.9,6227.5 4544.6,8299.4 -0.0,8388.0 -0.0,-0.0 5688.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3652.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8049149,41.9969362]}},{"type":"Feature","properties":{"resourceCoords":[-4.0,4656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8067906,41.997782]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0024/info.json","type":"ImageService2","height":8388,"width":5728},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8115.5 -0.0,6097.6 510.1,6114.5 -0.0,5285.7 1498.0,1183.7 2154.6,-0.0 4075.7,-0.0 3835.5,109.2 3741.6,4010.7 5728.0,5425.2 5728.0,7316.6 5509.0,8147.9 -0.0,8115.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80296567712875,41.99825772821881]}},{"type":"Feature","properties":{"resourceCoords":[5728.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80015509627756,41.99669975827291]}},{"type":"Feature","properties":{"resourceCoords":[5728.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8032034084608,41.99361936233641]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80601398931199,41.99517733228231]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0025/info.json","type":"ImageService2","height":8388,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4104.0 -0.0,227.8 470.3,-0.0 5123.8,-0.0 5688.0,502.4 5355.2,3728.8 5400.1,6365.4 5688.0,6368.5 5688.0,8388.0 1811.3,8388.0 2051.4,7339.0 2006.3,5463.4 -0.0,4104.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8010373355323,41.99725709470208]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79827827893116,41.995649246738985]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80144625738257,41.992604010151474]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8042053139837,41.99421185811457]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p26","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0026/info.json","type":"ImageService2","height":8388,"width":5728},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"804.4,6338.8 775.1,3688.5 1128.3,450.3 2111.8,1300.0 3138.6,-0.0 5728.0,144.7 5728.0,3240.8 5219.0,3907.9 4260.5,7579.5 4294.3,8070.7 4605.1,8388.0 1081.1,8375.2 1093.2,6345.7 804.4,6338.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2112.0,1300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7983047,41.9948859]}},{"type":"Feature","properties":{"resourceCoords":[5220.0,3908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.79776,41.9930784]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0027/info.json","type":"ImageService2","height":8388,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"183.1,7506.3 1112.0,3797.0 1618.2,3119.7 1587.1,-0.0 4104.8,-0.0 4243.6,6382.3 3414.2,6374.7 3446.2,8016.9 2280.3,8022.6 1981.5,8388.0 538.4,8317.5 222.0,8000.9 183.1,7506.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4200.0,3852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7962958,41.9921984]}},{"type":"Feature","properties":{"resourceCoords":[512.0,6344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7990042,41.9923359]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p28","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0028/info.json","type":"ImageService2","height":8388,"width":5728},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6314.1 822.3,6337.8 808.1,-0.0 4803.6,-0.0 4836.3,6345.4 5728.0,6346.5 5728.0,8013.0 -0.0,7943.1 -0.0,6314.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[828.0,3828.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7962958,41.9921984]}},{"type":"Feature","properties":{"resourceCoords":[828.0,1332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7953762,41.9931113]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p29","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0029/info.json","type":"ImageService2","height":8388,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"864.7,5877.3 767.8,-0.0 4766.5,-0.0 4846.0,5837.7 3978.3,5846.3 4012.9,8388.0 3305.6,8388.0 -0.0,8388.0 -0.0,7544.2 1779.4,7542.8 1760.6,5868.4 864.7,5877.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4812.0,3340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7923889,41.9900045]}},{"type":"Feature","properties":{"resourceCoords":[780.0,844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7934184,41.9920204]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p3","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0003/info.json","type":"ImageService2","height":8388,"width":5748},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4881.9,8388.0 -0.0,8388.0 -0.0,5593.4 997.3,4189.6 983.2,4189.4 1021.3,281.8 3919.2,313.7 4151.1,-0.0 5748.0,-0.0 5748.0,3705.4 4871.8,4922.9 4881.9,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7730857,41.9797233]}},{"type":"Feature","properties":{"resourceCoords":[5748.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7731047,41.9770639]}},{"type":"Feature","properties":{"resourceCoords":[5748.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77832520000001,41.977084399999995]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7783062,41.9797438]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p30","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0030/info.json","type":"ImageService2","height":8388,"width":5728},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,5801.8 852.1,5804.9 851.9,-0.0 4810.1,-0.0 4802.2,5824.5 5728.0,5824.8 5728.0,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[852.0,3352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7923889,41.9900045]}},{"type":"Feature","properties":{"resourceCoords":[852.0,860.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7914613,41.9909299]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p31","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"6"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0031/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3442.7,8388.0 1835.1,8388.0 1815.4,5849.5 1635.1,5850.9 1020.2,5855.7 874.5,5856.7 836.8,-0.0 4043.9,-0.0 5012.7,1308.2 4864.1,1418.6 4893.7,5826.0 4076.1,5832.2 4098.7,7563.2 3440.0,7556.0 3442.7,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3440.0,7556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7907102,41.9866707]}},{"type":"Feature","properties":{"resourceCoords":[876.0,3356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.790409,41.9889017]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p32","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"9"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0032/info.json","type":"ImageService2","height":8388,"width":5728},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"813.5,5718.0 841.2,1332.2 990.6,1224.4 108.5,-0.0 4960.7,-0.0 5728.0,1074.3 5728.0,3131.5 3527.6,4759.7 5484.0,7486.0 5466.5,8388.0 -0.0,8388.0 -0.0,5713.4 813.5,5718.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,3224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7884448,41.9878169]}},{"type":"Feature","properties":{"resourceCoords":[5484.0,7488.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7876887,41.9849792]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0033/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4136.9 397.2,4408.3 926.6,3675.6 860.3,323.4 4817.9,188.0 4882.2,4133.3 4793.1,4310.9 3997.2,3754.3 4011.0,5892.4 5700.0,7092.7 5700.0,8059.3 4025.4,8105.6 4026.8,8322.1 -0.0,8388.0 -0.0,4136.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78818340857981,41.986676245659865]}},{"type":"Feature","properties":{"resourceCoords":[5700.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78469601453055,41.98659240662632]}},{"type":"Feature","properties":{"resourceCoords":[5700.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78486083018873,41.982750772960735]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78834822423799,41.98283461199428]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p34","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0034/info.json","type":"ImageService2","height":8388,"width":5724},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,8172.0 1659.3,8137.2 1665.5,7172.6 -0.0,5963.2 -0.0,3829.4 784.9,4390.3 874.3,4213.7 836.0,276.0 4761.0,199.5 4828.0,6938.8 4705.3,7192.0 5724.0,7937.7 5724.0,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2812.0,4164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7840799,41.9847116]}},{"type":"Feature","properties":{"resourceCoords":[836.0,276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7852394,41.9865193]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0035/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"968.5,7051.7 1037.5,381.5 4916.7,271.0 4858.6,7940.5 4942.7,8359.5 1828.4,8388.0 1835.1,8058.1 842.0,7299.9 968.5,7051.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2920.0,4220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7816508,41.9847234]}},{"type":"Feature","properties":{"resourceCoords":[4892.0,8136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7804323,41.9829011]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0036/info.json","type":"ImageService2","height":8388,"width":5724},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3713.4,8143.5 3717.1,8388.0 945.9,8388.0 860.1,7966.1 910.5,241.5 4869.1,196.6 4773.0,8135.4 3713.4,8143.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7809509345483,41.98666446103532]}},{"type":"Feature","properties":{"resourceCoords":[5724.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77742891525175,41.98664789665843]}},{"type":"Feature","properties":{"resourceCoords":[5724.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77746134193055,41.982784387393586]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7809833612271,41.98280095177047]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p37","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0037/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"960.2,8116.1 982.3,136.4 3064.0,140.6 5700.0,967.3 5700.0,8017.6 960.2,8116.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4616.0,628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7757194,41.986309]}},{"type":"Feature","properties":{"resourceCoords":[2916.0,8076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7768391,41.982908]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p38","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0038/info.json","type":"ImageService2","height":8388,"width":5724},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4748.8,1778.5 5054.4,786.0 5084.2,4171.1 5340.6,4168.9 5342.6,8019.2 2190.3,8092.7 2175.2,977.4 4748.8,1778.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7757194,41.986309]}},{"type":"Feature","properties":{"resourceCoords":[3444.0,8064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7743543,41.982918]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p39","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0039/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2419.3,8388.0 -0.0,7641.4 2246.1,4195.1 601.0,3082.7 2368.4,479.1 2083.8,288.9 5414.1,294.4 5530.5,8132.9 5700.0,8134.4 5700.0,8388.0 2419.3,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5472.0,4204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7707258,41.9847601]}},{"type":"Feature","properties":{"resourceCoords":[600.0,3084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7700067,41.9869914]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p4","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0004/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"919.1,4596.5 1668.0,3613.2 1672.0,680.8 3882.8,704.6 4232.7,245.2 5433.5,267.1 5436.4,-0.0 5744.0,-0.0 5744.0,8388.0 789.1,8353.2 771.9,5014.5 919.1,4596.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4732.0,6152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7769713,41.9756701]}},{"type":"Feature","properties":{"resourceCoords":[788.0,8076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.778151,41.9774851]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0040/info.json","type":"ImageService2","height":8388,"width":5724},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"907.9,8121.5 767.0,241.4 3912.2,244.6 3949.3,8135.3 907.9,8121.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76815656152102,41.985122474981054]}},{"type":"Feature","properties":{"resourceCoords":[5724.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76819830551122,41.98248881015971]}},{"type":"Feature","properties":{"resourceCoords":[5724.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77335393586512,41.98253460223055]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77331219187492,41.9851682670519]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p41","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0041/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4870.6,5158.0 1615.5,2826.8 3484.5,269.9 4876.7,238.6 4870.6,5158.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2908.0,4012.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7864157,41.9884192]}},{"type":"Feature","properties":{"resourceCoords":[2908.0,8152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7864501,41.9865191]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p42","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0042/info.json","type":"ImageService2","height":8388,"width":5724},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4800.9,8142.9 883.2,8158.4 920.9,289.0 4816.3,195.2 4800.9,8142.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2836.0,3980.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7840047,41.9884328]}},{"type":"Feature","properties":{"resourceCoords":[4820.0,2152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7827651,41.9892657]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p43","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0043/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0043/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"467.4,541.7 3467.5,550.8 5700.0,3704.4 5700.0,6159.2 3256.5,7922.9 3258.4,8108.3 448.0,8220.2 467.4,541.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2996.0,8112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7812346,41.9865475]}},{"type":"Feature","properties":{"resourceCoords":[468.0,284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7827554,41.9901651]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p44","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"17"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0044/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5470.9,8118.3 -0.0,8139.5 -0.0,7954.9 2450.1,6223.3 2474.7,3779.0 53.5,283.6 4271.4,227.2 5108.0,796.0 5012.6,7438.7 5470.9,8118.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3796.0,2560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7787097,41.9891315]}},{"type":"Feature","properties":{"resourceCoords":[5108.0,796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7778936,41.9899479]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p45","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0045/info.json","type":"ImageService2","height":8388,"width":5700},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2477.5,7709.6 856.3,7684.6 384.5,6997.0 426.8,239.0 84.9,10.6 428.2,12.0 428.3,0.0 5700.0,0.0 5700.0,2197.2 4686.8,3126.2 5465.2,3669.5 4037.9,8212.9 2477.5,7709.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2468.0,4060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7766618,41.9882041]}},{"type":"Feature","properties":{"resourceCoords":[380.0,7688.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7779557,41.9865598]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0046/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1112.2,3981.2 4931.8,2744.6 4943.2,7999.6 1140.0,7996.0 1112.2,3981.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[208.0,2996.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7752998,41.9886208]}},{"type":"Feature","properties":{"resourceCoords":[1140.0,7996.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7757194,41.986309]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0047/info.json","type":"ImageService2","height":8388,"width":5696},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"277.9,4387.9 509.3,4311.3 522.3,2133.2 -0.0,1819.2 0.0,0.0 5696.0,0.0 5696.0,7582.4 5130.6,7192.8 4743.7,8388.0 2699.2,8388.0 2808.0,8046.5 2415.5,7773.3 2928.0,7308.5 2930.2,6206.7 268.3,6201.8 277.9,4387.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0047/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77817740597503,41.99568445606649]}},{"type":"Feature","properties":{"resourceCoords":[5696.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77127354637943,41.99565698680311]}},{"type":"Feature","properties":{"resourceCoords":[5696.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77132759103625,41.98804736482623]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77823145063185,41.98807483408961]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p48","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0048/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0048/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"884.0,5196.0 932.3,1184.0 834.5,1037.6 4418.5,0.0 4948.4,0.0 4902.0,7288.7 3215.6,8388.0 2869.6,8388.0 2891.4,5206.8 884.0,5196.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.0,5196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7707028,41.9862408]}},{"type":"Feature","properties":{"resourceCoords":[2868.0,8616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7682942,41.9861111]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0049/info.json","type":"ImageService2","height":8388,"width":5696},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1887.4 0.0,0.0 3632.7,0.0 3618.0,930.5 5187.3,618.8 5248.6,6740.8 2100.4,3206.8 546.4,1741.4 -0.0,1887.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0049/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80242238803645,41.9984235052158]}},{"type":"Feature","properties":{"resourceCoords":[5696.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79895108438315,41.99886636898707]}},{"type":"Feature","properties":{"resourceCoords":[5696.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79807970110922,41.99504049710797]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80155100476252,41.994597633336696]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p5","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0005/info.json","type":"ImageService2","height":8388,"width":5748},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8125.7 -0.0,298.8 5748.0,330.8 5748.0,8167.2 -0.0,8125.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4852.0,6200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.772014,41.9811085]}},{"type":"Feature","properties":{"resourceCoords":[4852.0,8156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7732261,41.981115]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p50","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"15"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0050/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1170.7,7937.1 1180.4,2357.9 1427.4,2356.4 1423.2,364.1 1646.2,472.4 3682.5,3147.3 3564.5,3233.8 4971.8,5154.6 4861.6,5235.6 4692.1,5012.7 3250.3,6109.1 3298.2,6382.9 2005.2,7325.9 1992.6,7441.7 2717.4,8388.0 557.4,8388.0 1170.7,7937.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[764.0,4344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7914613,41.9909299]}},{"type":"Feature","properties":{"resourceCoords":[2008.0,6340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7885724,41.990742]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p51","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0051/info.json","type":"ImageService2","height":8388,"width":5696},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2322.9,1609.9 5696.0,6420.2 5652.2,7289.4 605.0,7313.3 434.1,7151.4 498.8,3918.0 -0.0,3660.2 0.0,0.0 565.7,0.0 521.9,2204.7 1438.9,2204.2 2322.9,1609.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4424.0,7300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7851678,41.9901397]}},{"type":"Feature","properties":{"resourceCoords":[2324.0,1608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.786469,41.9927144]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0052/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2613.6,7282.1 2624.1,6631.8 2745.4,6545.8 425.1,3260.1 3663.8,1061.1 5595.1,3626.5 5375.4,3818.2 5339.3,7258.9 2613.6,7282.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78603762751136,41.993466665873925]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7825329457062,41.993481146847536]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78250469320393,41.98965045322281]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7860093750091,41.9896359722492]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p53","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"7"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0053/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3382.3 -0.0,-0.0 4620.7,0.0 4714.8,3986.7 3302.5,4709.9 5008.2,5855.9 3456.1,6394.6 3542.1,8038.4 3791.1,8388.0 624.1,8388.0 597.1,4515.8 821.8,4311.2 -0.0,3382.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-708.0,2244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7834948,41.9927351]}},{"type":"Feature","properties":{"resourceCoords":[624.0,8116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7827554,41.9901651]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p54","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0054/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6572.7 1505.7,6055.9 -0.0,5049.0 -0.0,4876.1 1223.3,4255.7 1127.3,0.0 5373.0,0.0 5744.0,230.3 5744.0,4589.7 5281.7,4745.6 5284.2,8388.0 4937.2,8388.0 4417.4,8046.2 81.5,8155.9 -0.0,6572.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0054/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78103499621731,41.99388038757452]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77755654986635,41.99385105642527]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77761377593542,41.99004908843952]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78109222228639,41.99007841958877]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p55","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0055/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0055/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3426.8,1940.4 5531.9,5184.9 3899.8,6270.2 4464.3,7155.6 4442.8,8059.2 1681.5,7938.8 1867.5,7557.3 1852.7,6822.6 133.1,4136.0 2025.6,2874.5 2077.4,2606.0 1662.7,2882.6 863.9,1641.0 896.8,362.4 1912.2,397.7 1899.2,705.6 5105.7,841.1 3426.8,1940.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1716.0,2964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7844635,41.9937638]}},{"type":"Feature","properties":{"resourceCoords":[80.0,4056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7851686,41.994501]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0056__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p56 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5744.0"},{"label":"split_canvas_h","value":"8388.0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0056__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0056/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4889.5,8243.9 4967.1,4210.9 4560.4,4212.7 4633.6,193.3 4241.0,751.6 3319.5,740.4 1654.8,3484.0 0.0,3524.8 -0.0,8388.0 3883.6,8388.0 3884.0,8232.1 4889.5,8243.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0056__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3884.0,6220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7816106,41.9941826]}},{"type":"Feature","properties":{"resourceCoords":[3884.0,8232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7828689,41.9941762]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p57","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0057/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2096.9,8351.5 1355.1,8384.6 965.1,8206.0 1020.0,4986.6 1975.1,4328.3 2011.2,2281.1 1102.1,1185.8 1134.2,207.7 211.0,209.3 192.5,0.0 3344.3,0.0 3342.6,197.4 4635.3,191.3 4623.4,4147.2 3745.2,4749.6 3309.6,4129.4 3306.7,4466.9 4768.7,6548.2 2096.9,8351.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1020.0,4988.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7875196,41.9951771]}},{"type":"Feature","properties":{"resourceCoords":[4624.0,2188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7853213,41.99646]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p58","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0058/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4166.6 435.2,4775.1 1297.1,4173.2 1276.0,268.0 -0.0,284.7 0.0,-0.0 5744.0,0.0 5744.0,3260.8 5052.7,3267.6 5090.9,7181.6 3972.1,7189.4 2760.2,8026.4 3018.9,8388.0 2780.2,8388.0 -0.0,4499.7 -0.0,4166.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5252.0,5200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7828629,41.9950894]}},{"type":"Feature","properties":{"resourceCoords":[1276.0,268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7853211,41.9973689]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0059__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p59 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5692.0"},{"label":"split_canvas_h","value":"8388.0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0059__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0059/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5692.0,2682.8 3300.8,2669.6 3144.8,2369.2 3147.2,1971.2 3147.6,1897.6 3156.4,0.0 -0.0,-0.0 -0.0,7585.0 5692.0,8085.1 5692.0,2682.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0059__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2628.0,7816.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7898973,41.9973397]}},{"type":"Feature","properties":{"resourceCoords":[3532.0,3684.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7895855,41.9992307]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0006/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1501.0,210.6 4201.5,230.8 4227.9,8103.7 1487.2,8076.5 1501.0,210.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76824599603073,41.98136912215278]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76826516131746,41.978715828859414]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77344082392568,41.97873678072039]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77342165863895,41.98139007401375]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0060/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"847.5,8077.8 848.1,240.5 4798.8,163.9 4784.0,1131.0 5708.0,2197.3 5708.0,4220.9 4769.0,4888.2 4771.1,8388.0 2717.2,8388.0 -0.0,8388.0 -0.0,8097.0 847.5,8077.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0060/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79041738922028,41.99745522861111]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78690499550513,41.99742307064899]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78696813557053,41.99355997378412]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79048052928569,41.99359213174624]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0061/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0061/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4653.2,4417.7 5279.7,6789.0 5228.3,7202.6 3321.9,7540.9 3192.9,6739.8 -0.0,6753.9 -0.0,0.0 768.6,-0.0 918.6,1587.7 4643.4,1230.9 4653.2,4417.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0061/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78998789212608,42.00157239978031]}},{"type":"Feature","properties":{"resourceCoords":[5692.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78999482981625,41.99637254822085]}},{"type":"Feature","properties":{"resourceCoords":[5692.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80023366257056,41.9963801996482]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80022672488039,42.00158005120766]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0062/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4477.8,589.3 4516.5,4384.7 4586.5,4667.4 3040.8,6582.3 3247.2,7383.6 1165.7,7782.9 1215.6,7372.1 587.2,5019.6 555.2,555.6 4477.8,589.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0062/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78921159685544,41.99784874738143]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78923775390382,41.992596114765995]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79955091572293,41.99262488363868]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79952475867455,41.99787751625412]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p63","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0063/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3657.1,7285.0 3651.0,8272.7 5692.0,8298.4 5692.0,8388.0 -0.0,8388.0 -0.0,-0.0 5692.0,0.0 5692.0,210.2 3813.4,4119.7 5129.4,4124.0 3657.1,7285.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4172.0,6108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7777098,42.0046075]}},{"type":"Feature","properties":{"resourceCoords":[5128.0,4124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.775427,42.0056851]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0064/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7284.3 1459.4,4214.1 137.2,4226.4 2000.2,287.0 1998.8,76.4 -0.0,101.5 0.0,0.0 5708.0,0.0 5708.0,8388.0 -0.0,8388.0 -0.0,7284.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77417748874194,42.009647074544375]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76829749877878,42.00685665789193]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77377712151339,42.00039053587448]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77965711147655,42.003180952526925]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p65","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"30"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0065/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"635.7,0.0 5692.0,0.0 5692.0,3438.0 4974.9,3434.0 4970.6,4231.2 5239.0,4421.0 5692.0,4431.8 5692.0,5365.8 5371.2,5115.3 5363.7,7432.2 4953.4,7428.6 4948.2,8388.0 -0.0,8388.0 -0.0,7578.3 565.6,7587.2 635.7,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4404.0,2428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7664203,42.0025639]}},{"type":"Feature","properties":{"resourceCoords":[3396.0,5396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.769395,42.0007371]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0066/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0066/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4208.9 0.0,-0.0 4923.4,0.0 5321.2,1414.3 5708.0,5108.5 4974.5,8388.0 -0.0,8388.0 -0.0,7383.8 408.7,7382.5 -0.0,4208.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76422815110938,42.00417729947946]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75826712589686,42.00137201033874]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76377547500977,41.99481620504793]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76973650022228,41.99762149418865]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0067/info.json","type":"ImageService2","height":8388,"width":5692},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"777.1,5548.0 405.7,5777.6 396.7,1834.5 -0.0,1836.9 -0.0,0.0 5002.1,11.9 5005.0,3050.6 5692.0,2623.4 5692.0,7810.7 5009.4,7810.3 5010.0,8382.4 139.4,8388.0 191.9,8164.8 503.4,8164.0 504.7,7808.2 416.4,7808.1 408.5,5907.7 776.8,5678.8 777.1,5548.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0067/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7588181245454,42.00207857736334]}},{"type":"Feature","properties":{"resourceCoords":[5692.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75289544057331,41.99930491692272]}},{"type":"Feature","properties":{"resourceCoords":[5692.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75835681825664,41.99277275861125]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76427950222873,41.99554641905188]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0068/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"688.9,2617.6 -0.0,3045.0 0.0,-0.0 5708.0,0.0 5708.0,8388.0 -0.0,8388.0 -0.0,7814.7 684.0,7815.7 688.9,2617.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0068/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75362106591622,41.99963180383281]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7476908714577,41.99686021941959]}},{"type":"Feature","properties":{"resourceCoords":[5708.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75313265500797,41.99033786046715]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75906284946649,41.993109444880375]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p69","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0069/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,6983.6 0.0,5420.3 716.0,4446.5 716.0,308.0 3745.7,401.1 4042.7,0.0 5720.0,0.0 5720.0,8166.7 4764.8,8175.5 4896.3,8388.0 4633.8,8388.0 4504.9,8181.9 710.9,8212.1 710.3,8388.0 0.0,8388.0 0.0,7768.2 710.5,7932.2 708.8,6782.4 0.0,6983.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[716.0,4448.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.765439,41.9967153]}},{"type":"Feature","properties":{"resourceCoords":[716.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7676062,41.9977244]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p7","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0007/info.json","type":"ImageService2","height":8388,"width":5748},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,235.3 1558.0,252.0 1558.0,252.1 5748.0,296.9 5748.0,4937.5 3336.0,8176.3 -0.0,8128.6 -0.0,235.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[100.0,2248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.769642,41.9793844]}},{"type":"Feature","properties":{"resourceCoords":[2432.0,8164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7732852,41.9783236]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p70","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"26"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0070/info.json","type":"ImageService2","height":8388,"width":5708},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5106.2,5953.7 5200.7,5954.4 5223.2,7922.5 588.3,7878.6 239.6,8388.0 -0.0,8388.0 0.0,-0.0 5708.0,-0.0 5708.0,4032.6 5109.0,4888.8 5106.2,5953.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5212.0,6944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7671288,41.9829486]}},{"type":"Feature","properties":{"resourceCoords":[76.0,4888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7645532,41.9876735]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p71","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0071/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3396.1,5953.8 3392.9,6174.4 3068.6,6172.3 2835.4,6327.9 331.1,6365.7 335.2,3407.8 -0.0,3421.0 0.0,0.0 246.0,0.0 909.5,460.0 3291.9,2226.3 3208.0,2300.3 4920.9,3623.8 4076.9,4708.9 5219.8,5590.0 4469.6,5531.0 3396.1,5953.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80723299153614,41.99582021343338]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8002409834022,41.99579210083297]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80029606182364,41.98811766877243]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80728806995758,41.98814578137284]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p72","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"18"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0072/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1987.1,4304.4 -0.0,4319.6 -0.0,4084.8 645.3,3752.1 1053.5,3665.1 1794.8,3713.3 654.3,2853.5 1472.0,1763.3 3258.1,3124.8 3483.7,3068.9 5525.3,4577.4 5278.3,4913.2 5744.0,5255.7 5744.0,6257.6 5296.7,6350.9 5744.0,8235.5 4565.0,8291.4 4566.4,8388.0 1831.1,8388.0 2240.7,7885.5 1027.0,7295.7 372.7,6800.0 206.9,6563.9 652.4,6142.2 1987.1,4304.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[656.0,2852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8022804,41.9914919]}},{"type":"Feature","properties":{"resourceCoords":[1552.0,1656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8011377,41.9925794]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p73","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0073/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5316.7,8388.0 -0.0,8388.0 -0.0,526.3 5269.6,280.8 5316.7,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81333079481684,41.993020849428405]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80628653711065,41.99295428760188]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80641693966594,41.98522215753325]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81346119737212,41.98528871935977]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0074/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,5451.4 286.8,5451.7 261.0,212.1 2779.0,157.9 2973.3,0.0 5363.3,0.0 3988.8,1848.8 3531.5,2271.9 3698.6,2512.0 4361.2,3018.5 5593.0,3624.6 4868.3,4412.1 3794.7,5026.1 3818.7,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80718425135575,41.99019016542985]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8002024586953,41.99012863446921]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80032249628758,41.98249675771812]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80730428894803,41.98255828867876]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0075/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0075/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1382.2,4004.3 4166.5,4045.4 4166.5,3947.8 4316.7,3942.9 4303.9,7882.3 5720.0,7860.6 5720.0,8388.0 -0.0,8388.0 -0.0,4890.1 1382.2,4004.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0075/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80261611424766,41.990029653006374]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79565743452247,41.990005465749]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.795704818054,41.98236691735435]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80266349777919,41.98239110461172]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0076/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8135.6 -0.0,4222.9 1051.2,4185.5 613.5,2288.6 1066.8,2200.2 1078.6,1194.4 2185.5,2079.5 5201.0,4239.7 5448.6,3907.2 5710.9,4105.6 5429.9,4490.6 5744.0,4716.5 5744.0,8388.0 1407.4,8388.0 1406.5,8109.5 -0.0,8135.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79734595494197,41.99029250869709]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7903105756531,41.990250860478156]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79039182512363,41.982560416883956]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79742720441251,41.98260206510289]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p77","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"19"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0077/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0077/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3440.1,8388.0 609.4,8388.0 553.0,6857.6 -0.0,6872.7 -0.0,6574.7 543.2,6582.2 428.0,3670.6 314.3,3094.1 -0.0,2355.4 -0.0,2086.9 300.8,1725.2 1211.3,2402.9 1905.8,1430.6 1904.8,1676.0 5342.0,1689.9 5528.3,6935.2 3390.4,6929.3 3440.1,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3364.0,4220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8103523,41.9944945]}},{"type":"Feature","properties":{"resourceCoords":[2336.0,5228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8115857,41.9954318]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0078/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0078/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 -0.0,7835.7 343.8,7838.1 335.4,3104.1 621.6,3116.2 628.6,2122.6 1005.0,2113.8 1003.8,3132.5 1637.5,3159.3 2071.8,2619.1 2072.4,2150.3 3141.5,2186.9 3142.0,727.7 5263.0,806.2 5262.7,525.7 5744.0,547.6 5744.0,6835.2 5513.1,7146.5 5744.0,7327.2 5744.0,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0078/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81290710654619,41.997376155238854]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81267567125592,41.99211023390811]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82295002581048,41.99185728233648]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82318146110076,41.99712320366723]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p79","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0079/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0079/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8143.6 -0.0,236.5 1149.6,300.9 1242.7,190.4 3901.3,2564.2 4165.6,2268.2 4614.1,2668.0 2792.5,4980.1 4343.6,6205.5 3646.2,7100.6 4733.6,7089.5 4735.9,8101.5 -0.0,8143.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0079/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82275174100648,42.00428761155128]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81574713460343,42.00442308780468]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81548167290326,41.996735858623275]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82248627930632,41.99660038236987]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p8","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"6"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0008/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5744.0,301.6 5744.0,7947.1 4576.8,7937.8 4245.5,8388.0 2092.8,8388.0 2085.7,7637.4 522.5,7652.1 2592.6,4797.9 2542.6,830.6 3283.7,306.3 5744.0,301.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1468.0,2852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7700557,41.9773233]}},{"type":"Feature","properties":{"resourceCoords":[4900.0,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7684674,41.9756831]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p80","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"24"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0080/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0080/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5213.1 -0.0,5115.4 -0.0,4528.5 1145.0,2300.3 2264.3,332.0 5414.7,301.5 5744.0,5246.6 5744.0,8388.0 3649.6,8388.0 1186.4,8388.0 347.4,7328.9 -0.0,5213.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2520.0,3988.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8153549,41.9979395]}},{"type":"Feature","properties":{"resourceCoords":[4236.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8177183,42.0012566]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0081/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0081/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1295.7 647.5,1277.2 532.9,0.0 5222.6,0.0 5222.8,2021.5 3071.6,3754.3 3073.3,5332.9 3706.4,6102.3 3074.1,6098.4 3075.2,7168.2 1115.3,7173.6 1187.3,8388.0 -0.0,8388.0 -0.0,1295.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0081/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8218324449222,42.004528551592735]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81955571302547,42.00653886362945]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81561634938451,42.004040393976254]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81789308128124,42.00203008193954]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p82","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0082/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0082/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5356.0,7356.0 705.1,7380.8 472.5,3489.7 -0.0,3521.7 -0.0,2318.5 400.7,2316.1 329.2,1094.2 2304.1,1076.7 2303.8,0.0 2940.9,0.0 3820.4,1063.4 4267.2,1059.4 5744.0,2645.6 5744.0,3348.3 5356.1,3364.1 5356.0,7356.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5356.0,5372.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.814022,42.0032632]}},{"type":"Feature","properties":{"resourceCoords":[5356.0,7356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8130956,42.0026766]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p83","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"19"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0083/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0083/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"374.3,7637.2 9.4,1090.0 5028.0,1120.0 5004.0,3109.1 5720.0,3116.4 5720.0,3698.8 4722.1,4533.1 4679.0,5350.4 1903.0,5299.2 1908.0,6787.0 779.1,7631.6 374.3,7637.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0083/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5028.0,1120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8130956,42.0026766]}},{"type":"Feature","properties":{"resourceCoords":[1908.0,6788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8116627,41.9999628]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p84","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"10"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0084/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0084/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1212.0,7144.0 1212.0,1200.0 1599.0,1183.2 1598.9,848.1 5744.0,5795.0 5744.0,7095.6 4202.0,8388.0 1111.7,8388.0 2501.1,7241.7 1212.0,7144.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1212.0,7144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8121774,42.0020952]}},{"type":"Feature","properties":{"resourceCoords":[1212.0,1200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8149595,42.0038569]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p85","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0085/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0085/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 0.0,0.0 4607.3,0.0 4608.4,180.7 5268.3,150.8 5306.4,148.3 5357.7,8213.8 5215.2,8388.0 4011.5,8388.0 3392.3,7879.6 3406.9,6477.5 2614.5,5825.7 1102.1,7663.9 1639.7,8030.9 1362.6,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0085/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82282142387133,42.01168558421443]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81588431163517,42.0116098913406]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81603264662733,42.00399760899087]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.8229697588635,42.00407330186471]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0086/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0086/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,0.0 3945.6,0.0 4055.0,8152.8 4815.8,8113.2 5146.1,8388.0 1912.3,8388.0 1772.1,8271.4 690.3,8327.6 690.0,356.4 -0.0,384.0 0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0086/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81723173089713,42.01181331489741]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81018243821286,42.01176978381882]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81026738957452,42.00406673576054]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81731668225879,42.00411026683913]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p87","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0087/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0087/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"18.4,8324.4 -0.0,0.0 5720.0,0.0 5720.0,8388.0 4628.8,8388.0 4631.7,8136.5 18.4,8324.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0087/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81239023035255,42.01188608646683]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80542000227722,42.01190153608764]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.80538972560628,42.00425294436826]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81235995368161,42.00423749474745]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p88","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"28"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0088/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0088/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6678.9 1378.3,307.7 5199.3,81.3 5744.0,323.2 5744.0,1165.1 5744.0,2621.1 5744.0,6756.1 4851.6,7990.5 2319.2,8182.4 -0.0,8300.4 -0.0,6678.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3220.0,2188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8091818,42.0025881]}},{"type":"Feature","properties":{"resourceCoords":[1240.0,5100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8116627,41.9999628]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p89","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"30"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0089/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0089/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2994.9,5636.2 4144.7,6493.0 2901.3,6475.1 2910.2,6982.8 -0.0,6961.2 0.0,-0.0 3846.6,-0.0 3973.2,786.5 4264.6,1542.1 3796.3,1614.2 4108.5,3424.7 5055.9,3263.6 5352.6,3848.4 5264.8,3861.6 4655.4,3407.5 2994.9,5636.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2388.0,3868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8029628,41.9999871]}},{"type":"Feature","properties":{"resourceCoords":[4812.0,5448.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8048968,41.9977857]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p9","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0009/info.json","type":"ImageService2","height":8388,"width":5748},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4931.4,8130.5 943.8,8201.1 943.8,241.8 4918.0,162.1 4931.4,8130.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2920.0,4204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.76716,41.9811231]}},{"type":"Feature","properties":{"resourceCoords":[2920.0,8168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7671911,41.9793149]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p90","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0090/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0090/info.json","type":"ImageService2","height":8388,"width":5744},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"379.6,0.0 426.3,2138.9 1440.8,2116.8 1656.4,1882.3 1971.1,2105.2 3347.8,2075.2 3581.3,2237.2 3586.0,2070.0 5744.0,2023.0 5744.0,8388.0 4894.3,8388.0 4803.1,5672.8 -0.0,5834.1 0.0,0.0 379.6,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0090/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.823504150979,41.993824518461786]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81643046238344,41.99388319080558]}},{"type":"Feature","properties":{"resourceCoords":[5744.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81631599498868,41.986151302759254]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82338968358425,41.986092630415456]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_128 p91","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T15:50:06Z","modified":"2026-09-21T15:50:06Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0091/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0091/info.json","type":"ImageService2","height":8388,"width":5720},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8388.0 0.0,0.0 5720.0,0.0 5720.0,8388.0 -0.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195045:01790_45_1950-0091/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82451962021261,41.98841008740107]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81751171343787,41.98864452491264]}},{"type":"Feature","properties":{"resourceCoords":[5720.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.81705245434833,41.980951760293166]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8388.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.82406036112307,41.9807173227816]}}]}}]}