{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01790_066.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":"81"},{"label":"placed","value":"78"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef 46, georef-snap 32"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"1 sheet(s) cut into 2 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 41.70189,-87.69189 +/-3330m); p66 (tier 1, 41.69274,-87.70322 +/-525m); p79 (tier 1, 41.70271,-87.68666 +/-526m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p1","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"28"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0001/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"843.8,7249.3 -0.0,6695.0 -0.0,4760.9 844.1,874.6 1270.5,0.0 3407.2,0.0 5654.1,0.0 5680.0,2227.1 5680.0,3529.1 5680.0,4909.2 5680.0,7450.1 5680.0,8508.0 3764.6,8508.0 843.8,7249.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[844.0,2816.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.681327,41.6972798]}},{"type":"Feature","properties":{"resourceCoords":[844.0,2248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6813435,41.697811]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0010/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4947.0,3952.7 4955.1,7955.0 1838.7,7972.2 516.0,3949.6 405.7,3946.9 471.1,344.4 1223.5,416.4 933.6,224.7 885.5,0.0 2811.6,0.0 2811.7,0.0 4457.9,0.0 4464.7,3951.8 4947.0,3952.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2680.0,3948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6685188,41.6913124]}},{"type":"Feature","properties":{"resourceCoords":[2680.0,7972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6694934,41.6896154]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0011/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2999.5,6643.7 -0.0,7484.5 -0.0,3655.2 256.2,-0.0 395.3,-0.0 632.2,-0.0 3775.0,2693.1 5684.0,4537.9 5684.0,4649.6 5684.0,4906.2 2999.5,6643.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.66948280913198,41.69413756608576]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66932003639634,41.6889357012655]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67966923563621,41.68875256584871]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67983200837185,41.69395443066897]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0012/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5079.3,7134.7 5684.0,7129.3 5684.0,8504.0 2896.4,8504.0 2901.2,7154.0 -0.0,7179.7 -0.0,1214.2 2505.4,1179.7 2495.4,-0.0 2887.6,-0.0 2894.9,1174.9 5040.2,1129.0 5079.3,7134.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.67680185507955,41.693181504004954]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67675154965889,41.690564037090766]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68195907438206,41.690507438839916]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68200937980272,41.693124905754104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p13","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"14"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0013/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5500.1 -0.0,3505.7 1016.6,3402.2 832.1,584.8 3849.1,434.9 3809.1,0.0 5684.0,0.0 5684.0,5974.3 1120.9,6169.3 1083.7,5450.0 -0.0,5500.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2420.0,7496.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6794332,41.6844714]}},{"type":"Feature","properties":{"resourceCoords":[2888.0,4488.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6787588,41.6871936]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0014/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2364.6,7057.8 1999.8,6781.6 1730.3,6423.7 1824.6,6291.6 1976.5,2806.7 2344.5,2803.5 2444.1,2402.6 2666.3,1983.4 3075.5,1603.2 3715.3,1273.8 4171.4,880.0 4505.6,388.2 4507.3,7422.5 3442.4,7418.6 2364.6,7057.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67774899398624,41.69137418557972]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67082562882969,41.69145147091614]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6706718775638,41.68366153286143]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67759524272036,41.683584247525005]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p15","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0015/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0015/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7222.7 -0.0,184.9 82.2,0.0 148.3,0.0 7.2,1180.2 1808.7,1928.8 1842.0,1646.0 5367.3,3213.9 3599.0,7201.3 -0.0,7222.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1456.0,7224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6703415,41.684655]}},{"type":"Feature","properties":{"resourceCoords":[3272.0,2276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6682038,41.6892113]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_066 p16","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"20"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0016/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5382.4,2335.5 5684.0,1607.2 5684.0,8504.0 1417.0,8504.0 1399.1,7234.4 148.4,7245.8 1922.7,3262.7 3144.0,3810.6 3828.8,2287.9 4872.3,2720.0 4988.7,2333.7 5382.4,2335.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2532.0,7224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6647878,41.684762]}},{"type":"Feature","properties":{"resourceCoords":[1516.0,4176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6660974,41.6875383]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0017/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7820.1 -0.0,3272.1 146.0,3278.3 277.6,3372.2 790.1,2927.5 1013.8,2490.4 1267.4,1665.8 1289.2,786.3 5684.0,1252.8 5684.0,7829.8 5209.3,7839.6 5211.7,8504.0 2281.7,8504.0 2281.7,8504.0 1465.9,8504.0 1290.0,7843.3 -0.0,7820.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67140701573943,41.68581238168232]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67130908651671,41.680585564503055]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68170657509853,41.68047537010174]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68180450432125,41.685702187281]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p18","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"41"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0018/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1777.8,1218.4 5281.9,1645.3 5289.2,570.3 5519.0,640.5 5519.7,-0.0 5684.0,-0.0 5684.0,8504.0 -0.0,8504.0 -0.0,8377.5 1174.1,8399.3 1183.8,7740.5 1658.3,7739.6 1777.8,1218.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2036.0,2780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6747535,41.6802863]}},{"type":"Feature","properties":{"resourceCoords":[5248.0,6244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6788952,41.677227]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0019/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"670.6,8270.0 -0.0,8266.2 -0.0,4694.0 551.1,234.6 4721.4,258.5 4643.5,8504.0 598.3,8504.0 670.6,8270.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67301706156202,41.68481319306264]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6661879817433,41.68497349027523]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66586911946665,41.677288852855895]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67269819928536,41.6771285556433]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0002/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"204.6,7598.0 195.5,7155.5 609.2,7006.7 1045.9,6472.6 1252.8,5918.6 1361.2,5325.9 1318.5,4321.8 1139.4,3603.3 2155.6,3603.6 2151.0,2279.9 171.8,2302.4 158.6,971.3 2118.6,963.6 2116.7,16.0 5680.0,0.0 5680.0,7536.9 4942.9,8508.0 2172.6,8508.0 2169.4,7589.7 204.6,7598.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67797174312975,41.69999360047224]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67102234897817,41.70009757530487]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67081523129183,41.6922701978085]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6777646254434,41.692166222975864]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0020/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"977.5,1488.9 5345.6,1510.9 5352.8,0.0 5684.0,0.0 5684.0,8504.0 733.5,8504.0 733.3,8464.4 -0.0,8471.3 -0.0,202.8 965.3,199.1 977.5,1488.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.66734012127091,41.68489554735036]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66052802517204,41.68500699350024]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66030633695884,41.677341473924706]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66711843305771,41.677230027774826]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p21","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0021/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7698.0 -0.0,3994.1 668.0,3906.5 793.0,0.0 5684.0,0.0 5684.0,7711.2 -0.0,7698.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4800.0,4168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6820165,41.719107]}},{"type":"Feature","properties":{"resourceCoords":[4800.0,8104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6819521,41.7172922]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0022/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 5680.6,0.0 5684.0,8215.4 -0.0,8127.4 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4804.0,4296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6818934,41.7154788]}},{"type":"Feature","properties":{"resourceCoords":[4804.0,392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6819521,41.7172922]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0023/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"789.9,4077.9 805.0,8117.8 -0.0,8114.0 -0.0,235.7 5684.0,306.3 5684.0,8176.3 2736.0,8112.0 2735.2,7817.8 1989.3,7812.8 1975.6,4088.2 789.9,4077.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4808.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6818352,41.7136643]}},{"type":"Feature","properties":{"resourceCoords":[2736.0,8112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6830172,41.7100282]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0024/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2775.5,8118.1 2037.1,8109.4 1950.5,0.0 2697.2,0.0 2700.1,292.4 5652.0,336.6 5682.6,8152.1 4860.2,8150.4 4864.2,8504.0 2779.1,8504.0 2775.5,8118.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.68469128488056,41.71014641446262]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68117254419217,41.71018408690372]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68109757473226,41.706226185165264]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68461631542066,41.70618851272416]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p25","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0025/info.json","type":"ImageService2","height":8504,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,8259.0 -0.0,8151.3 -0.0,264.5 2796.0,324.0 2795.9,710.2 4867.5,729.6 4866.9,375.7 5684.0,385.0 5684.0,8259.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2796.0,324.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6829015,41.7063865]}},{"type":"Feature","properties":{"resourceCoords":[2796.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6827856,41.7027358]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0026/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,279.7 4469.9,319.3 5099.5,380.9 5664.0,387.3 5664.0,8231.4 4.1,8126.0 -0.0,279.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2744.0,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6827856,41.7027358]}},{"type":"Feature","properties":{"resourceCoords":[2744.0,8152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6826696,41.6990818]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0027/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"884.6,8504.0 -0.0,8504.0 -0.0,322.2 4832.3,316.6 4952.7,4067.6 4912.5,8246.8 4628.8,8184.3 3205.6,8187.8 3208.8,8504.0 2844.7,8504.0 2841.4,8188.7 881.2,8193.4 884.6,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4872.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.681327,41.6972798]}},{"type":"Feature","properties":{"resourceCoords":[828.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6838337,41.6972554]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p28","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"18"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0028/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8189.4 -0.0,602.3 756.3,610.4 756.1,299.8 2716.0,316.0 2716.0,631.3 3080.0,635.2 3078.2,4227.2 4784.1,4242.3 4781.9,8234.3 -0.0,8189.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2716.0,4224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6824964,41.6936313]}},{"type":"Feature","properties":{"resourceCoords":[2716.0,316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6825538,41.69544]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0029/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4787.7,339.6 4766.7,4231.4 4091.6,4227.9 4073.4,7814.5 1648.5,7794.8 1649.2,7584.3 683.1,7580.5 681.2,8094.4 -0.0,8087.8 -0.0,-0.0 4112.9,20.3 4111.3,337.2 4787.7,339.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69817576423598,41.73551362325718]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69126631869992,41.73564205638784]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69100973621717,41.72784567138671]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69791918175324,41.72771723825605]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p3","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0003/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4680.5,4616.8 5100.8,5277.4 3972.6,7279.7 3099.8,6870.2 3082.4,6945.0 3078.7,6868.4 2386.6,6565.2 2390.5,6190.0 1253.7,6958.2 1352.2,0.0 4692.8,0.0 4680.5,4616.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4688.0,1720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6668416,41.6980712]}},{"type":"Feature","properties":{"resourceCoords":[4680.0,4616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6667302,41.6954161]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0030/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"679.4,317.4 -0.0,318.4 -0.0,0.1 5664.0,0.0 5664.0,8504.0 662.3,8504.0 314.9,8149.9 -0.0,8148.0 -0.0,4226.5 678.2,4226.6 679.4,317.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69315785015391,41.73558835650279]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68627827173032,41.73568997819179]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6860752525458,41.72792730738614]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6929548309694,41.727825685697134]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p31","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0031/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4134.0,0.0 4127.2,3237.2 4884.3,3241.4 4892.7,7229.1 916.5,7219.0 914.7,8504.0 -0.0,8504.0 -0.0,-0.0 4134.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3896.0,3236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7080947,41.726151]}},{"type":"Feature","properties":{"resourceCoords":[2904.0,7224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7092131,41.7224745]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p32","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0032/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"756.9,3251.8 -0.0,3249.3 -0.0,13.2 5664.0,0.0 5664.0,7249.9 4762.3,7246.5 4768.4,6453.8 4685.4,6454.2 4675.1,7246.2 773.7,7238.2 756.9,3251.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2752.0,7240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.704337,41.7225391]}},{"type":"Feature","properties":{"resourceCoords":[3732.0,1272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7032674,41.7280316]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p33","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0033/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4456.6 -0.0,491.0 1634.5,0.0 1634.5,0.0 5664.0,0.0 5664.0,6480.7 3713.0,8504.0 693.1,8504.0 -0.0,4456.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2696.0,4480.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6994789,41.7244176]}},{"type":"Feature","properties":{"resourceCoords":[4708.0,512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6971006,41.7281082]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0034/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.5,8305.7 -0.0,303.9 1949.5,0.0 4359.1,0.0 5016.4,665.6 5664.0,663.6 5664.0,8285.8 27.5,8305.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69832335184618,41.72837493710048]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69136876864376,41.728461776723506]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69119530063662,41.72061358396376]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69814988383905,41.72052674434074]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p35","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"15"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0035/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.0,1584.0 5664.0,1583.9 5664.0,8504.0 -0.0,8504.0 -0.0,4124.3 228.0,1584.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2212.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7104221,41.7224582]}},{"type":"Feature","properties":{"resourceCoords":[228.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7116557,41.7224416]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p36","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0036/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"846.6,5454.6 864.9,1596.3 5271.2,1617.0 5664.0,5750.2 5664.0,8504.0 832.1,8504.0 846.6,5454.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3304.0,5604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7067129,41.7206653]}},{"type":"Feature","properties":{"resourceCoords":[3304.0,1608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7067691,41.7225073]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p37","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0037/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4725.2,1618.1 4791.8,8504.0 1225.2,8492.5 1211.0,6103.7 791.9,5470.5 792.0,1616.0 4725.2,1618.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2760.0,1616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.704337,41.7225391]}},{"type":"Feature","properties":{"resourceCoords":[792.0,1616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.705554,41.7225238]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0038/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"722.1,1571.9 2639.0,0.0 2806.8,0.0 4564.0,1606.3 5664.0,5732.9 5664.0,5766.1 4810.7,8504.0 744.7,8504.0 722.1,1571.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70358347376033,41.723264478839226]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70013763567712,41.723325244922385]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7000162571953,41.71943645553671]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70346209527851,41.71937568945355]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0039/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5402.2 -0.0,5133.6 -0.0,1653.5 4801.9,1668.2 5664.0,5687.2 5664.0,5687.2 5664.0,8504.0 4222.5,8504.0 -0.0,5402.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70080209127221,41.72335755963779]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69725364512792,41.72340440115944]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69716008057003,41.719399813019756]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70070852671432,41.719352971498104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0004/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"657.2,7360.9 -0.0,6797.3 -0.0,6047.1 -0.0,-0.0 5258.0,0.0 5680.0,4409.1 5680.0,5414.0 5269.0,6164.5 1411.8,7702.5 657.2,7360.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66849429378269,41.69969251253035]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66156481691786,41.6998111013241]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66132858912704,41.69200612835541]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66825806599186,41.691887539561655]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p40","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0040/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5411.7 -0.0,1626.1 5215.5,0.0 5664.0,0.0 5664.0,8504.0 589.8,8504.0 -0.0,5411.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1320.0,1616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6969483,41.7226208]}},{"type":"Feature","properties":{"resourceCoords":[5296.0,5600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6944394,41.7207706]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p41","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0041/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8504.0 0.0,0.0 4743.7,0.0 4742.5,199.5 5676.0,208.6 5676.0,2268.6 4735.0,2260.7 4728.0,4252.0 5676.0,4260.2 5676.0,8504.0 -0.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4728.0,4252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7163836,41.7168959]}},{"type":"Feature","properties":{"resourceCoords":[2744.0,6240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7187409,41.715031]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0042/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"732.0,4271.1 0.0,-0.0 4589.4,0.0 5676.0,1775.6 5676.0,8504.0 3998.0,8438.4 3998.4,8504.0 1742.8,8496.1 1736.6,8056.8 732.0,4271.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71734999019894,41.72079744517331]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71043557208161,41.72087200744899]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71028696122721,41.71308472385773]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71720137934454,41.713010161582055]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0043/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0043/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7948.6 -0.0,20.0 4813.3,18.1 5676.0,4852.9 5676.0,8504.0 111.7,8504.0 110.2,8015.7 -0.0,7948.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71264739260045,41.72066549238452]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70565198468992,41.72075921451848]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70546518660647,41.712880696625]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.712460594517,41.71278697449104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p44","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"25"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0044/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1214.0,4471.7 748.3,5204.8 759.2,7952.5 -0.0,7952.4 -0.0,4769.6 322.9,4452.7 -0.0,4208.7 -0.0,3777.0 438.6,3424.7 742.1,2847.0 739.8,1511.1 3707.2,1522.0 3708.0,2036.0 4689.2,2038.0 4694.7,3032.6 5676.0,3030.9 5676.0,7963.3 4721.7,7953.4 4724.7,8504.0 1669.3,8504.0 1669.4,7639.8 1573.8,7639.8 1582.8,4855.1 1214.0,4471.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3708.0,2036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029945,41.718902]}},{"type":"Feature","properties":{"resourceCoords":[4700.0,4008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7017188,41.717104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p45","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0045/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8206.4 -0.0,1713.9 2010.3,364.8 3998.1,378.0 5676.0,1889.9 5676.0,2157.6 5676.0,2342.4 5676.0,8312.4 4088.7,8504.0 892.9,8504.0 -0.0,8206.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4976.0,2328.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6968391,41.7189811]}},{"type":"Feature","properties":{"resourceCoords":[912.0,6228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7016542,41.7152838]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p46","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"27"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0046/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2719.6,8235.7 1483.1,8225.3 1426.7,4245.4 1208.7,4243.1 703.0,4238.0 701.4,2275.8 1195.9,2279.0 1398.8,2280.3 1392.4,1829.7 2857.1,1849.5 2877.1,369.4 4711.2,367.9 4731.8,8504.0 2720.6,8504.0 2719.6,8235.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4716.0,2304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6918959,41.7190312]}},{"type":"Feature","properties":{"resourceCoords":[2716.0,7220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6942335,41.7144757]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0047/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1739.3,8233.4 782.7,8224.1 751.8,310.6 1369.1,317.4 1370.0,0.0 5676.0,0.0 5676.0,231.5 4257.2,220.6 4255.7,347.9 5676.0,364.8 5676.0,8254.5 3819.6,8240.0 3820.8,8504.0 1739.7,8485.7 1739.3,8233.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.69287281076157,41.721081053447364]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68596771534355,41.72118143413182]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68576764462031,41.71340468616622]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69267274003833,41.71330430548176]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__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_066 p48 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2754.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,303.1 1403.1,304.0 1489.5,8157.5 1718.3,8156.5 1721.3,8504.0 2271.8,8504.0 2178.9,2182.0 2513.1,2131.8 2540.0,169.7 2754.0,165.8 2754.0,0.0 1399.7,0.0 1401.6,171.3 -0.0,176.4 -0.0,303.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1331.0,4200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6860086,41.7172683]}},{"type":"Feature","properties":{"resourceCoords":[1562.9,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6857623,41.7208491]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__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_066 p48 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"22"},{"label":"split_canvas_x","value":"2752.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2923.2"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4689.2,662.3 4139.7,653.2 4080.1,8188.1 3971.1,8186.4 3967.6,8504.0 4634.0,8504.0 4634.3,8200.6 5676.0,8223.9 5676.0,2250.7 5080.3,2243.4 5080.4,4274.2 4675.9,4270.8 4689.2,662.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0048__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3812.5,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6858986,41.7136313]}},{"type":"Feature","properties":{"resourceCoords":[4080.4,7224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.685357,41.7072694]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p49","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0049/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,874.0 5577.3,889.6 5580.0,0.0 5676.0,0.0 5676.0,8233.9 4108.0,8224.6 4109.0,7955.8 830.4,7986.6 831.0,8205.9 -0.0,8211.5 -0.0,874.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3780.0,4288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7075883,41.7097279]}},{"type":"Feature","properties":{"resourceCoords":[800.0,312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7113537,41.7133198]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p5","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0005/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1845.0,8104.4 1827.1,4919.0 1930.6,4337.0 1876.8,3835.0 1097.2,1214.5 -0.0,1833.9 -0.0,-0.0 5680.0,0.0 5680.0,8220.8 5208.4,8488.5 4994.6,8121.2 1845.0,8104.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2460.0,948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6604454,41.6994262]}},{"type":"Feature","properties":{"resourceCoords":[2996.0,8140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6640398,41.693362]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0050/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4678.9,492.4 5656.0,475.4 5656.0,8203.6 4751.5,8204.1 4749.5,7997.7 3870.6,7999.6 3871.7,8504.0 3758.5,8504.0 3756.4,8200.7 1592.8,8195.5 1564.8,767.0 4681.4,755.6 4678.9,492.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70725436672294,41.71357618639171]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70040796258142,41.71366433494099]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7002316712041,41.70592552231323]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7070780753456,41.705837373763956]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p51","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"34"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0051/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1521.6,8144.9 -0.0,8139.9 -0.0,225.8 2820.0,255.4 2820.0,524.2 4296.3,529.7 4309.3,8169.7 4150.4,8168.3 4146.8,8504.0 1519.7,8504.0 1521.6,8144.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2820.0,3224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6941144,41.7108193]}},{"type":"Feature","properties":{"resourceCoords":[2820.0,5208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.694055,41.7089994]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p52","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0052/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8178.2 -0.0,477.9 542.5,480.8 542.9,216.9 1497.3,232.5 1495.9,486.0 3572.2,518.1 3572.7,252.8 5656.0,281.6 5582.5,8251.0 3555.6,8216.3 3556.0,8027.8 1357.8,8000.7 1357.5,8192.8 -0.0,8178.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1544.0,6228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6903156,41.7081274]}},{"type":"Feature","properties":{"resourceCoords":[540.0,8184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6914774,41.7063235]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0053/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 5656.0,0.0 5656.0,8274.7 3821.6,8265.3 3822.1,8504.0 2810.2,8504.0 2808.8,8260.2 -0.0,8248.3 -0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72184303402403,41.70610320080596]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71496154679045,41.706236127757656]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71469573248598,41.698456752751454]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72157721971956,41.69832382579976]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p54","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0054/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4712.2,8260.8 4712.4,4231.4 3919.6,4241.4 3933.9,8256.4 3700.1,8255.0 3704.4,7947.2 1538.0,7927.2 1542.8,190.1 5656.0,205.0 5656.0,8266.4 4712.2,8260.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.71682949931332,41.70614102739141]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70997452995051,41.70627660943217]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70970340607174,41.69852721766332]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71655837543454,41.698391635622556]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0055/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0055/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8238.2 -0.0,4688.7 -0.0,4247.2 803.8,0.0 1866.7,0.0 4113.0,0.0 4797.6,279.8 4786.4,4273.3 4783.4,5281.3 4750.1,8282.7 2755.4,8504.0 2551.2,8504.0 1758.5,8504.0 -0.0,8238.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0055/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71209948592556,41.70625559845307]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7052109297774,41.70641070716966]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70490075784413,41.698623358654686]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7117893139923,41.698468249938095]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_066 p56","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"39"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0056/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0056/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5656.0,8220.9 716.9,8206.7 732.4,5220.1 -0.0,5216.2 -0.0,4211.4 729.4,4217.0 717.1,243.3 3723.9,270.5 3724.0,570.3 3835.0,571.1 3798.8,4240.6 4703.7,4247.7 4700.5,280.3 5649.1,285.9 5656.0,8220.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3724.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7024205,41.7025183]}},{"type":"Feature","properties":{"resourceCoords":[3724.0,8216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7023035,41.6988587]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0057/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4222.5 -0.0,-0.0 880.2,0.0 881.0,102.3 1788.1,0.0 4107.5,0.0 5656.0,197.1 5656.0,7769.7 4760.2,8252.8 1905.1,8245.9 -0.0,4222.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70240326185166,41.706356726425476]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6955674198409,41.70645558382377]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69536973368939,41.698727841220716]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70220557570015,41.698628983822424]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0058/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"827.3,8504.0 -0.0,8504.0 -0.0,194.0 1719.0,191.2 1716.8,0.0 3729.3,0.0 3731.3,187.8 5656.0,196.2 5656.0,8222.1 4966.7,8222.4 4969.9,8504.0 3840.2,8504.0 3835.6,8223.0 825.1,8224.6 827.3,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69233444433088,41.70649085676123]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68546567460741,41.70656111808]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68532517217167,41.69879616023863]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69219394189514,41.698725898919854]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_066 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0059/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0059/info.json","type":"ImageService2","height":8504,"width":5656},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,222.7 2803.2,258.3 2802.5,501.0 3809.7,509.5 3811.3,271.9 5656.0,297.0 5656.0,2281.2 5656.0,2281.5 5656.0,8504.0 -0.0,8504.0 -0.0,222.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72160344382607,41.69876225727506]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71469225990883,41.69893977452457]}},{"type":"Feature","properties":{"resourceCoords":[5656.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71433731874116,41.69112593768763]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7212485026584,41.69094842043812]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p6","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0006/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4688.2,1284.5 4710.4,8508.0 707.3,8508.0 708.0,1296.0 4688.2,1284.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4700.0,5836.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6646511,41.6900766]}},{"type":"Feature","properties":{"resourceCoords":[708.0,1296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6682038,41.6892113]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0060/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3684.1,0.0 3682.6,305.6 5669.0,298.7 5672.0,2285.0 4707.8,2288.1 4728.2,4282.9 3874.3,4286.7 3874.5,6268.9 4748.5,6266.5 4775.9,8504.0 1695.0,8504.0 1533.4,0.0 3684.1,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.71658511906165,41.69893015832031]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.709658981867,41.699018937656994]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7094819702962,41.69121029788458]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71640810749085,41.691121518547895]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0061/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0061/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"831.4,3255.8 1814.1,3252.7 1793.3,1519.7 2785.0,1507.0 2793.0,1268.2 4766.7,1261.5 4802.4,7213.2 4396.4,7214.3 4430.0,8504.0 3334.7,8504.0 3330.6,7217.1 2842.7,7218.3 2834.2,6378.4 1851.7,6381.3 1861.8,7220.8 -0.0,7225.6 -0.0,5248.8 851.6,5245.1 831.4,3255.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.71187530454047,41.699887342662265]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70493021329641,41.69997701776411]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7047514130627,41.692147125056714]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71169650430676,41.692057449954866]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p62","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0062/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4777.7,7243.1 732.9,7237.2 717.5,1253.6 4737.1,1252.3 4777.7,7243.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4752.0,3248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7010142,41.6970503]}},{"type":"Feature","properties":{"resourceCoords":[708.0,3248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7059739,41.6969746]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p63","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0063/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1838.1,8360.8 1845.7,6718.2 868.1,6696.5 920.9,397.4 4672.9,462.7 4676.5,0.0 5672.0,0.0 5672.0,8434.4 5334.2,8429.1 5333.0,8504.0 3315.9,8504.0 3318.4,8394.1 2823.6,8383.0 1838.1,8360.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2804.0,2424.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6986741,41.6970754]}},{"type":"Feature","properties":{"resourceCoords":[3876.0,7412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6971348,41.6925229]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0064/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8262.9 -0.0,496.2 695.0,498.3 693.5,217.3 3721.5,224.9 3725.2,507.5 4861.5,510.9 4859.1,227.7 5672.0,229.7 5672.0,8269.5 -0.0,8262.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.69203825897256,41.69917813729608]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68519002698274,41.699263690867866]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68501944628345,41.691542917973614]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69186767827327,41.69145736440183]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p65","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0065/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"833.0,1663.0 2781.6,1663.7 2766.9,0.0 4700.5,0.0 4711.9,1664.5 5672.0,1664.9 5672.0,5608.1 4781.2,5608.2 4829.2,8504.0 893.3,8504.0 833.0,1663.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2816.0,5608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7093727,41.6914362]}},{"type":"Feature","properties":{"resourceCoords":[860.0,5608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7105897,41.6914178]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0067/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4803.7,8504.0 2790.2,8504.0 2817.3,5580.1 -0.0,5514.6 -0.0,1546.7 4733.8,1657.8 4671.2,5389.7 4856.7,5848.7 4803.7,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.70638147780716,41.69402811124168]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70290123323637,41.69414134619173]}},{"type":"Feature","properties":{"resourceCoords":[5672.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70267547147002,41.69021748241427]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7061557160408,41.69010424746422]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p68","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0068/info.json","type":"ImageService2","height":8504,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2852.5,8504.0 2824.9,5540.8 812.3,5541.3 695.5,5309.5 672.0,1600.0 4769.0,1607.5 4820.1,8504.0 2852.5,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2732.0,1600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7021506,41.6933768]}},{"type":"Feature","properties":{"resourceCoords":[672.0,1600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7034329,41.6933577]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p69","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0069/info.json","type":"ImageService2","height":8504,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2777.0,7256.0 812.0,7256.0 827.7,8504.0 -0.0,8504.0 -0.0,6290.6 798.6,6285.3 711.6,0.0 2664.8,0.0 2722.5,3281.9 4093.0,3282.3 4127.9,8504.0 2794.8,8504.0 2777.0,7256.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4744.0,7256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6983233,41.6897659]}},{"type":"Feature","properties":{"resourceCoords":[812.0,7256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7007493,41.6897417]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p7","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0007/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5014.0,7796.0 -0.0,7794.2 -0.0,97.7 1098.8,703.1 5397.4,1068.6 5014.0,7796.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5016.0,7796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6646511,41.6900766]}},{"type":"Feature","properties":{"resourceCoords":[480.0,7796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.667239,41.6909006]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p70","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0070/info.json","type":"ImageService2","height":8504,"width":5660},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2532.0,7216.0 1573.2,7209.3 1564.8,8467.7 -0.0,8457.3 -0.0,3192.8 1599.9,3203.8 1598.5,3425.3 5660.0,3316.3 5660.0,4569.8 4262.9,4584.9 4283.1,8504.0 2545.0,8504.0 2532.0,7216.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2692.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6971348,41.6925229]}},{"type":"Feature","properties":{"resourceCoords":[2532.0,7216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.697159,41.6897775]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p71","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0071/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"825.6,8504.0 828.3,7684.5 -0.0,7670.0 -0.0,281.6 830.4,293.2 828.0,1518.2 2820.0,1539.7 2811.6,73.1 4368.3,0.0 4369.4,89.8 4778.0,94.3 4779.2,8049.8 2790.7,8028.7 2792.6,8504.0 825.6,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[828.0,3096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7104722,41.6886255]}},{"type":"Feature","properties":{"resourceCoords":[828.0,8008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7102847,41.6841203]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p72","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"22"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0072/info.json","type":"ImageService2","height":8504,"width":5672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5672.0,8080.7 5672.0,8504.0 1737.8,8504.0 1738.5,8048.1 770.5,8040.7 746.2,52.1 1749.9,60.1 1758.1,1537.9 2768.5,1532.2 2737.3,67.9 3761.3,76.1 3762.9,1583.0 4360.9,1587.9 4344.3,2703.2 4761.7,2709.4 4750.5,8071.4 5672.0,8080.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4756.0,5528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7006391,41.6865923]}},{"type":"Feature","properties":{"resourceCoords":[2764.0,8056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7029886,41.6842318]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p73","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"33"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0073/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7615.9 1744.4,7620.4 1745.5,7200.5 831.2,7188.8 859.2,1244.9 1842.1,1262.0 1840.2,1886.1 3283.4,1911.3 3294.3,1287.2 3770.0,1295.6 3769.6,1934.5 4632.1,1943.7 4642.9,0.0 5664.0,0.0 5664.0,8504.0 -0.0,8504.0 -0.0,7615.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2340.0,7208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6986975,41.684294]}},{"type":"Feature","properties":{"resourceCoords":[1836.0,3240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6994694,41.6879327]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0074/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4671.1,2374.5 3914.9,2370.4 3836.2,8504.0 -0.0,8504.0 -0.0,-0.0 3945.1,15.6 3940.5,371.7 4690.8,376.3 4671.1,2374.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.72087637582477,41.68427751826436]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71396770323662,41.68441488567382]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71369349044157,41.67661316103894]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72060216302972,41.67647579362948]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p75","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"41"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0075/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0075/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5664.0,789.6 5664.0,3255.4 3982.6,3265.9 3995.7,4261.5 4715.0,4209.6 4741.9,4265.7 4794.8,6191.2 4021.4,6203.8 4047.2,8158.7 4664.9,8154.1 4670.5,8471.5 -0.0,8504.0 -0.0,2321.5 739.8,2315.8 734.0,345.9 -0.0,351.0 -0.0,-0.0 4623.9,0.0 4635.4,807.6 5664.0,789.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3744.0,4264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7113224,41.6804366]}},{"type":"Feature","properties":{"resourceCoords":[768.0,4264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7150342,41.6803992]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0076/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"792.3,6188.1 764.2,4230.5 737.4,4173.2 -0.0,4215.9 -0.0,3203.9 1722.2,3216.5 1755.6,710.4 2687.7,706.8 2683.7,230.7 5664.0,250.4 5664.0,8504.0 634.1,8504.0 632.7,8181.3 -0.0,8177.4 -0.0,6190.3 792.3,6188.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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":[-87.71114663536356,41.684302249232125]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70425151662747,41.684441849591984]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.70397284625044,41.67665543551444]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.71086796498653,41.67651583515458]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0077/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0077/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5664.0,8504.0 -0.0,8504.0 -0.0,175.7 5664.0,237.9 5664.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0077/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69196455167743,41.691836072549656]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68507248069386,41.69197299183034]}},{"type":"Feature","properties":{"resourceCoords":[5664.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.68479913018965,41.684190933441954]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.69169120117321,41.68405401416127]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p78","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"23"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0078/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0078/info.json","type":"ImageService2","height":8504,"width":5664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2223.6 1663.0,0.0 2395.5,0.0 4132.2,318.0 4791.2,1729.8 4837.2,2380.0 4807.3,5538.0 4727.8,8253.6 4032.3,8426.3 4030.8,8504.0 1722.5,8504.0 -0.0,8183.7 -0.0,2223.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3732.0,2468.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6823886,41.6898079]}},{"type":"Feature","properties":{"resourceCoords":[2724.0,8224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6833945,41.6845003]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p8","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0008/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"173.1,7753.6 740.2,1051.8 2429.9,1222.0 2767.3,1994.2 3789.5,1560.6 3939.4,0.0 5680.0,0.0 5680.0,7421.1 4960.2,7715.2 5039.8,8508.0 2809.5,8508.0 2830.1,7825.0 173.1,7753.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2544.0,5216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6627014,41.6907688]}},{"type":"Feature","properties":{"resourceCoords":[3984.0,7856.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6624704,41.6893835]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_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_066 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T21:26:15Z","modified":"2026-09-21T21:26:15Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0009/info.json","type":"ImageService2","height":8508,"width":5680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"876.7,2397.1 2294.4,0.0 4528.8,0.0 4671.2,287.2 4900.1,414.0 4142.9,319.2 3965.0,3910.6 4075.6,3916.2 5429.7,8508.0 1525.6,8508.0 564.2,4515.2 876.7,2397.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67118078175233,41.694069164361956]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66794723839836,41.69310793734463]}},{"type":"Feature","properties":{"resourceCoords":[5680.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.66986187213975,41.68946562454425]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.67309541549372,41.690426851561575]}}]}}]}