{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01790_064.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1947 | mapsnap generated fit (2026-09-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-20"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"87"},{"label":"placed","value":"81"},{"label":"unplaced","value":"6"},{"label":"fit sources","value":"georef 46, georef-snap 35"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"4 sheet(s) cut into 8 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 41.72957,-87.57997 +/-3580m); p10__2 (tier 1, 41.74689,-87.58479 +/-121m); p61__1 (tier 1, 41.72442,-87.55698 +/-108m); p80__2 (tier 1, 41.72540,-87.61251 +/-100m); p81 (tier 2, 41.72427,-87.53584 +/-100m); p82 (tier 2, 41.73481,-87.60131 +/-100m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0001/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8508.0 -0.0,-0.0 5415.5,0.0 5403.1,8117.4 5684.0,8116.9 5684.0,8508.0 -0.0,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2832.0,4196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.622557,41.7345572]}},{"type":"Feature","properties":{"resourceCoords":[2832.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6226058,41.7363805]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0010__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 | 1947 | sanborn01790_064 p10 [1]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"35"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5684.0"},{"label":"split_canvas_h","value":"8508.0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0010__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0010/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3208.0,1983.1 3206.8,0.0 -0.0,-0.0 -0.0,62.5 649.4,59.2 687.7,8044.1 1449.1,8046.6 1448.7,7977.3 2840.6,7969.9 2871.1,4036.9 2909.3,4037.2 2905.9,2254.7 3208.0,1983.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0010__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2060.0,1264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5929709,41.735907]}},{"type":"Feature","properties":{"resourceCoords":[1304.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.593746,41.7295052]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0011/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 4999.1,0.0 4998.0,269.6 5684.0,271.0 5684.0,8195.5 4945.5,8194.4 4941.1,8508.0 2230.2,8508.0 2233.9,8190.5 242.8,8187.7 240.1,7817.3 -0.0,7814.9 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59195649452894,41.73693853694779]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5884998199336,41.73699183397099]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58839366281242,41.73310353955022]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59185033740776,41.73305024252702]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0012/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"715.4,8231.5 685.2,316.5 -0.0,317.7 -0.0,-0.0 5684.0,0.0 5684.0,8176.7 715.4,8231.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0012/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58891685329797,41.73700755952188]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58545582913591,41.73705098829283]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58536932753174,41.73315780516618]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5888303516938,41.73311437639523]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0013/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,360.2 5684.0,8276.3 4166.5,8277.8 4166.6,8117.9 2827.0,8126.8 2826.6,8508.0 -0.0,8508.0 22.3,394.5 2975.8,400.6 2976.2,198.9 4171.6,199.4 4171.3,357.7 5684.0,360.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0013/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6243114573789,41.73287543381523]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61747079449198,41.73298790618303]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61724679255065,41.725292366740504]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62408745543756,41.72517989437271]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0014/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5214.7,2237.6 4723.6,2240.3 4732.8,4237.2 5226.2,4234.9 5227.3,5239.1 4780.5,5241.5 4793.5,8047.5 5157.9,8046.1 5439.1,8236.6 5232.9,8239.9 5234.3,8508.0 2966.3,8508.0 2964.5,8256.8 1243.6,8265.5 1242.5,8125.1 752.3,8128.5 701.1,415.4 5207.8,394.7 5214.7,2237.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0014/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61831957501025,41.733031119272006]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61142366379775,41.73311010581064]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61126635250426,41.725352429307]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61816226371675,41.72527344276837]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p15","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"18"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0015/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0015/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4289.4 972.1,4288.3 975.1,597.4 4915.7,552.1 4916.1,8269.6 -0.0,8271.4 -0.0,4289.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4916.0,6272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6095104,41.7301918]}},{"type":"Feature","properties":{"resourceCoords":[4916.0,4284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6095344,41.7311008]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p16","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0016/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4594.7,8245.5 634.2,8243.0 641.5,216.6 4617.8,218.8 4594.7,8245.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[636.0,6232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6095104,41.7301918]}},{"type":"Feature","properties":{"resourceCoords":[4612.0,2224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6071401,41.7320495]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p17","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0017/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"912.1,292.7 4880.8,295.5 4852.1,7966.7 888.8,7973.3 912.1,292.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[900.0,4272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6071184,41.7311383]}},{"type":"Feature","properties":{"resourceCoords":[4864.0,6272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6046601,41.7302604]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"19"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0018/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,8153.1 172.0,8180.0 172.0,316.0 4525.1,302.9 4582.6,0.0 5684.0,0.0 5684.0,8153.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[172.0,8180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6046427,41.7293508]}},{"type":"Feature","properties":{"resourceCoords":[172.0,316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6047261,41.7329968]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p19","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"13"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0019/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4229.5,8170.3 4226.0,7657.7 -0.0,7713.1 -0.0,-0.0 306.7,0.0 312.8,360.4 2236.0,344.0 2235.5,653.0 4853.9,627.0 4839.0,4228.2 5152.3,4226.3 5684.0,4222.3 5684.0,8157.0 4229.5,8170.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4220.0,4232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5892202,41.7313999]}},{"type":"Feature","properties":{"resourceCoords":[2236.0,344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5904958,41.7332163]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0002/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2719.5,8508.0 2719.3,8199.5 105.2,8204.8 111.8,0.0 5357.3,0.0 5356.6,329.8 5093.0,329.9 5151.8,8508.0 2719.5,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62106322496291,41.73655868835578]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61755284171979,41.736609793168505]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61745105172578,41.732661057441554]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6209614349689,41.73260995262883]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0020/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4250.6 -0.0,280.4 5649.3,167.7 5684.0,0.0 5684.0,8157.5 881.9,8240.2 865.2,4241.2 -0.0,4250.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5888478347797,41.73336954158836]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58535200909148,41.73338700195348]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58531723345925,41.72945444627654]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58881305914747,41.72943698591142]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p21","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0021/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4715.3,8508.0 3142.0,8508.0 2646.0,8252.6 1270.9,8238.6 718.4,7857.7 -0.0,7857.5 -0.0,2284.2 880.8,2283.4 887.8,289.0 4811.8,287.9 4812.0,7242.6 5124.1,7806.2 4715.3,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4812.0,6256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6094136,41.7265387]}},{"type":"Feature","properties":{"resourceCoords":[4812.0,2280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6094619,41.7283639]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p22","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0022/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,8458.6 766.0,8460.7 785.7,285.5 2716.3,324.3 4774.8,1683.0 4715.9,8225.2 5684.0,8226.7 5684.0,8458.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[776.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6117693,41.7237673]}},{"type":"Feature","properties":{"resourceCoords":[4740.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6093585,41.7238079]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0023/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"892.2,309.4 4775.7,308.6 4759.8,8173.4 1914.6,8174.3 1176.8,7850.2 1201.2,7760.3 892.0,7201.8 892.2,309.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[892.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.609438,41.7274577]}},{"type":"Feature","properties":{"resourceCoords":[892.0,6224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6094136,41.7265387]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p24","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"18"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0024/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"829.0,0.0 4741.6,0.0 4706.7,8137.5 790.9,8133.6 829.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[800.0,6180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6070097,41.7265773]}},{"type":"Feature","properties":{"resourceCoords":[4740.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6046427,41.7293508]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p25","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0025/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"653.7,337.9 3650.2,337.1 3632.4,8182.8 629.5,8181.6 653.7,337.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[636.0,6224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6045757,41.7266188]}},{"type":"Feature","properties":{"resourceCoords":[636.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.604602,41.7275396]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0026/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4838.2,8159.3 -0.0,8154.6 -0.0,241.6 4856.3,237.9 4838.2,8159.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60278215852377,41.72949199715176]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59930188680403,41.72954218915667]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59920192588616,41.72562689600283]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6026821976059,41.72557670399792]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0027/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"821.7,8208.9 825.5,344.8 4732.1,343.4 4710.5,8203.3 821.7,8208.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2780.0,4260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5985494,41.7276261]}},{"type":"Feature","properties":{"resourceCoords":[2780.0,344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5985914,41.7294414]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p28","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0028/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4639.0,301.6 4657.1,8151.3 736.2,8160.4 750.4,306.7 4639.0,301.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2700.0,4216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5961263,41.7276584]}},{"type":"Feature","properties":{"resourceCoords":[2700.0,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.596166,41.7294733]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p29","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0029/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4735.2,8173.7 839.1,8197.6 812.0,312.0 1545.6,310.1 1543.1,0.0 3061.8,0.0 3097.0,4235.1 4726.7,4230.7 4735.2,8173.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2780.0,4236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.593705,41.7276907]}},{"type":"Feature","properties":{"resourceCoords":[812.0,312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5949602,41.7294891]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p3","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"10"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0003/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"262.5,0.0 5684.0,0.0 5684.0,171.8 5362.0,94.3 5360.4,467.3 4619.2,459.7 4589.8,4360.4 5337.0,4364.1 5307.1,8508.0 -0.0,8507.0 -0.0,431.1 258.4,432.7 262.5,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2772.0,6268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6160708,41.7337428]}},{"type":"Feature","properties":{"resourceCoords":[2772.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6160387,41.7328349]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0030/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4156.8,8226.4 5684.0,8251.5 5684.0,8508.0 -0.0,8508.0 -0.0,6178.6 807.2,6182.1 831.3,2219.1 -0.0,2214.2 -0.0,-0.0 3608.8,0.0 3607.2,264.0 4605.1,267.9 4575.6,4213.0 5577.6,4224.6 5579.0,6222.3 5143.6,6233.7 4995.3,6322.6 4926.7,6836.8 4796.5,7014.8 4189.0,7044.6 4156.8,8226.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59357236385061,41.72971276095093]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58667511596474,41.72983550517295]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58643066851506,41.72207592533999]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59332791640094,41.721953181117975]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0031/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"871.3,304.3 5180.1,329.0 5187.8,0.0 5684.0,0.0 5684.0,8160.1 763.8,8064.5 871.3,304.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0031/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58851961980746,41.7296968134199]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58501398800465,41.72977596369744]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58485635420031,41.72583215165127]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58836198600312,41.725753001373725]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p32","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0032/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5969.3 1195.4,5910.6 1451.9,5557.7 1587.4,4538.5 1879.3,4362.3 2736.0,4340.0 2736.0,380.0 5684.0,422.5 5684.0,8508.0 -0.0,8313.0 -0.0,5969.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2736.0,4340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5866238,41.7241583]}},{"type":"Feature","properties":{"resourceCoords":[2736.0,380.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5866828,41.7259802]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0033/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,778.7 5389.2,751.3 5420.3,8508.0 -0.0,8508.0 -0.0,778.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0033/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62398422369188,41.72553911754392]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62051337319264,41.72558293902991]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6204261049759,41.721678004737214]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62389695547515,41.72163418325122]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0034/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"350.3,8508.0 353.3,0.0 2973.4,0.0 2973.3,312.6 4939.2,312.6 4929.8,8446.2 350.3,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62091282234458,41.725586063813154]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61741529008238,41.725641761260746]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61730437143937,41.721706810529824]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62080190370158,41.72165111308223]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0035/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1308.7,279.8 1309.0,0.0 2278.9,0.0 2279.1,280.0 4888.1,284.5 4862.4,8508.0 281.3,8508.0 302.9,283.4 1308.7,279.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2260.0,4272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6166146,41.7236858]}},{"type":"Feature","properties":{"resourceCoords":[288.0,4272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6178236,41.7236655]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p36","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0036/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5189.9,8334.7 5684.0,8332.9 5684.0,8508.0 -0.0,8508.0 -0.0,394.9 780.8,393.9 782.3,886.1 5184.0,903.8 5189.9,8334.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3244.0,4296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6129835,41.7237469]}},{"type":"Feature","properties":{"resourceCoords":[3244.0,392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6130308,41.7255673]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0037/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8255.9 1059.2,8259.8 1059.1,8034.7 112.7,8033.2 168.9,1684.6 -0.0,1567.5 -0.0,706.9 458.5,0.0 1194.0,323.2 5684.0,342.7 5684.0,6263.4 4152.7,5507.6 4181.2,8261.4 5684.0,8268.3 5684.0,8508.0 -0.0,8508.0 -0.0,8255.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0037/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6095019464558,41.72578322720962]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60596630727025,41.72584309662509]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60584708006655,41.721865283081215]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6093827192521,41.72180541366574]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p38","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0038/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5564.7 1535.9,6315.2 1495.9,351.8 5684.0,273.2 5684.0,8508.0 1550.6,8508.0 1549.4,8334.6 47.1,8338.3 -0.0,5564.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1804.0,352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6057698,41.725685]}},{"type":"Feature","properties":{"resourceCoords":[-88.0,5516.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6068963,41.7232736]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0039/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,4263.2 4675.0,4220.4 4659.7,8159.9 805.8,8127.7 830.5,271.1 4696.9,291.2 4691.1,1878.2 5684.0,1877.5 5684.0,4263.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59230203992426,41.72627407950131]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59222143498764,41.723637052718054]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59747304531909,41.72354636875078]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59755365025572,41.726183395534036]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p4","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"10"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0004/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"761.3,8508.0 760.0,4266.5 -0.0,4268.5 -0.0,300.8 753.9,303.0 752.9,0.0 5684.0,0.0 5684.0,287.3 4703.9,289.6 4704.1,8508.0 761.3,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4704.0,2264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.612067,41.735629]}},{"type":"Feature","properties":{"resourceCoords":[4704.0,8196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6119978,41.7328878]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0040/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"803.9,7548.6 831.4,2621.9 2769.4,2639.9 2779.0,658.9 3286.4,641.8 3287.0,-0.0 5688.0,-0.0 5688.0,8504.0 4917.7,8504.0 4925.5,7582.3 803.9,7548.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59411370645105,41.72663860334112]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59394648014761,41.72139092811948]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60438474466015,41.721203009173394]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6045519709636,41.72645068439503]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0041/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8504.0 -0.0,-0.0 5518.0,0.0 5378.8,504.2 5464.3,4190.8 4759.8,4885.7 5688.0,5782.6 5688.0,8504.0 -0.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5657774620018,41.73731078791628]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56224979356807,41.73737139763819]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56212921186315,41.733407924147315]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56565688029688,41.7333473144254]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__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 | 1947 | sanborn01790_064 p42 [1]","metadata":[{"label":"streets","value":"1"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"6569.2"},{"label":"split_canvas_w","value":"2750.8"},{"label":"split_canvas_h","value":"1934.8"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2750.8,8504.0 2217.4,7866.6 1551.0,7568.6 969.0,7776.8 507.6,6573.2 0.0,6576.4 0.0,8502.4 2750.8,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,6569.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56192405920764,41.733872734843565]}},{"type":"Feature","properties":{"resourceCoords":[2750.8,6569.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55880783262263,41.73495290628665]}},{"type":"Feature","properties":{"resourceCoords":[2750.8,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55778723264022,41.733320681344445]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56090345922523,41.73224050990136]}},{"type":"Feature","properties":{"resourceCoords":[1551.3,7568.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5596398,41.7336387]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__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 | 1947 | sanborn01790_064 p42 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5688.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4609.4,179.2 4610.1,0.0 683.2,0.0 571.0,417.2 685.1,4130.7 -0.0,4851.1 3670.7,8504.0 4474.7,8504.0 4964.0,8036.0 4921.6,178.2 4609.4,179.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0042__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2648.0,4128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5611121,41.7354307]}},{"type":"Feature","properties":{"resourceCoords":[4964.0,8036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5596398,41.7336387]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0043/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0043/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"626.6,271.5 312.1,268.0 316.8,0.0 5688.0,0.0 5688.0,328.1 5144.4,322.2 5101.5,4276.4 4507.1,4268.9 4453.2,8186.3 4484.6,8186.7 4481.3,8504.0 3375.4,8504.0 3229.7,8169.2 561.5,8132.0 626.6,271.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56012954478359,41.7373910600583]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55663004628343,41.737466894365724]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55647917551534,41.73353507314102]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5599786740155,41.733459238833596]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p44","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0044/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4235.8 585.2,4235.0 573.9,314.1 1109.0,312.5 1104.7,0.0 5688.0,0.0 5506.6,51.9 5505.8,300.3 4969.7,301.7 5020.0,8120.0 -0.0,8120.2 -0.0,4235.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2764.0,4232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5555527,41.7354985]}},{"type":"Feature","properties":{"resourceCoords":[5020.0,8120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5541057,41.7337007]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0045/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"594.8,8111.1 596.5,247.5 1139.7,249.9 1142.2,0.0 5091.7,4.2 5059.9,8142.0 594.8,8111.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55458180040448,41.737455947241905]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5510719334657,41.73751343120278]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55095757024131,41.73356996363319]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55446743718008,41.733512479672314]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0046/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"457.9,8181.6 453.4,0.0 4438.4,0.0 4461.3,8191.3 457.9,8181.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0046/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55171812772873,41.73750185429755]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54822669421742,41.737547342412576]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54813619642383,41.73362458859868]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55162762993514,41.73357910048365]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p47","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0047/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8085.1 -0.0,2.7 174.4,3.1 174.2,0.0 5688.0,0.0 5688.0,213.4 5688.0,228.6 5688.0,8104.4 5020.0,8104.0 5020.0,8504.0 483.9,8504.0 482.9,8087.5 -0.0,8085.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5020.0,8104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5457466,41.7337971]}},{"type":"Feature","properties":{"resourceCoords":[5020.0,4184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5457957,41.7356296]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p48","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0048/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0048/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1345.5,184.7 1341.5,0.0 5688.0,0.0 5688.0,8168.4 1219.5,8202.5 1153.9,198.8 1345.5,184.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2740.0,4224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5444193,41.7356417]}},{"type":"Feature","properties":{"resourceCoords":[508.0,4224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5457957,41.7356296]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p49","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0049/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"845.7,7220.1 -0.0,7219.4 -0.0,-0.0 5688.0,0.0 5688.0,7225.0 4802.2,7224.1 4795.5,1250.8 4059.5,1250.8 4048.4,7223.2 1832.1,7221.1 1831.9,7078.5 845.6,7082.5 845.7,7220.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1828.0,3240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5743705,41.7316063]}},{"type":"Feature","properties":{"resourceCoords":[4800.0,5232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5706734,41.7298306]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0005/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4722.1,8508.0 764.1,8508.0 863.1,243.9 1857.9,253.8 1860.9,0.0 4815.7,37.2 4722.1,8508.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0005/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61262129813096,41.736640950966496]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60915350092233,41.736721668608794]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60899272811437,41.73282084432416]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.612460525323,41.73274012668186]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p50","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"24"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0050/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1241.7 1622.0,0.0 4513.1,0.0 4873.7,352.3 5688.0,1448.4 5682.1,7194.0 751.8,7198.4 -0.0,7198.8 -0.0,1241.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2712.0,5208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5682514,41.7298637]}},{"type":"Feature","properties":{"resourceCoords":[740.0,3224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5707214,41.731657]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p51","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"25"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0051/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7902.0 -0.0,-0.0 772.1,0.0 3577.1,2178.4 4753.3,3396.4 5688.0,5443.3 5617.6,8504.0 3281.5,8504.0 -0.0,7902.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2536.0,3944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5634301,41.7317584]}},{"type":"Feature","properties":{"resourceCoords":[4520.0,5936.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5609219,41.7299639]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0052/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1456.4,2206.7 1821.8,2204.5 1637.8,2381.3 2210.3,2932.4 3559.6,2325.6 3468.6,2127.4 4018.6,2116.5 4043.2,4696.8 5444.1,6045.3 5445.0,6138.0 3585.1,7754.2 3242.0,7864.1 2116.7,7873.6 -0.0,5921.5 32.6,836.1 1456.4,2206.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0052/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56221749334735,41.735453526633115]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55517948900858,41.73550105949422]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55508492915565,41.72759310746966]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56212293349442,41.727545574608556]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p53","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0053/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5942.8 -0.0,350.8 5688.0,370.0 5688.0,8182.5 2740.0,8184.1 2740.0,8504.0 2354.6,8302.1 -0.0,5942.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2740.0,4256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.555463,41.7318635]}},{"type":"Feature","properties":{"resourceCoords":[2740.0,360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5555079,41.733685]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p54","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0054/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4946.0,8172.7 1186.6,8169.6 1187.2,253.3 4949.9,267.4 4946.0,8172.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0054/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55439203440964,41.73381236598663]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55089988820986,41.73386119536729]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5508027486125,41.729937415254106]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55429489481229,41.72988858587345]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0055/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0055/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5032.1,8152.6 529.0,8108.1 557.8,205.4 5051.6,236.2 5032.1,8152.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0055/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55169528735894,41.73382069918565]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54820222577854,41.73387782115956]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5480885891165,41.7299530141373]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5515816506969,41.72989589216339]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p56","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0056/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0056/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"431.3,8107.6 465.6,741.7 4982.6,758.2 4955.8,8144.6 431.3,8107.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2928.0,8128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5469248,41.7301267]}},{"type":"Feature","properties":{"resourceCoords":[4984.0,360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5457466,41.7337971]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0057/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5079.3,211.6 5106.4,8151.5 626.5,8186.5 563.2,243.8 5079.3,211.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0057/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54609336777844,41.73390615405595]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54260953868155,41.733938025419036]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54254613472017,41.73002359646815]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54602996381706,41.729991725105066]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p58","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0058/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1083.5,305.5 1084.6,0.0 5688.0,0.0 5688.0,8328.0 5380.7,8337.1 5383.3,8504.0 441.0,8504.0 436.0,308.0 1083.5,305.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[436.0,8080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.542905,41.7301826]}},{"type":"Feature","properties":{"resourceCoords":[436.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5429808,41.7338372]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0059/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0059/info.json","type":"ImageService2","height":8504,"width":5688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1438.0,332.9 5688.0,219.7 5688.0,970.2 5387.3,1296.5 5578.4,8504.0 -0.0,8504.0 -0.0,7010.2 2056.2,4829.3 1547.5,4843.0 1438.0,332.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55242312257856,41.73072524442327]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55245277495953,41.72808905858932]}},{"type":"Feature","properties":{"resourceCoords":[5688.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55769691587396,41.72812237732919]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55766726349299,41.73075856316314]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p6","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"16"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0006/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4706.5,8241.9 749.8,8252.7 729.9,0.0 4513.5,0.0 4514.5,242.6 4703.1,242.4 4706.5,8241.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[740.0,4260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6096311,41.7347471]}},{"type":"Feature","properties":{"resourceCoords":[4704.0,2260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6072269,41.7356918]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p60","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0060/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"796.4,1333.0 1110.3,1011.8 1129.7,255.1 1848.5,256.3 4746.7,2497.7 5704.0,2499.7 5704.0,7043.8 803.5,7043.5 796.4,1333.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[816.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5525909,41.728233]}},{"type":"Feature","properties":{"resourceCoords":[4820.0,7044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5566997,41.7263539]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0061__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 | 1947 | sanborn01790_064 p61 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5704.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0061__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0061/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2648.5,5212.7 1748.0,6374.2 2072.8,6669.2 2072.4,8504.0 4412.0,8504.0 4829.9,8504.0 4812.9,357.5 2652.0,368.0 2648.5,5212.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0061__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2652.0,4220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5525909,41.728233]}},{"type":"Feature","properties":{"resourceCoords":[2652.0,368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5526359,41.7300601]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p62","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0062/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2393.6,8121.9 2023.9,7772.8 1693.6,7775.8 1620.0,352.0 3847.7,356.9 3884.0,8112.0 2393.6,8121.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1620.0,352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5512621,41.7300839]}},{"type":"Feature","properties":{"resourceCoords":[3884.0,8112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5497769,41.7264322]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0063/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3962.0,8140.3 1737.5,8167.0 1655.7,258.0 3858.9,235.9 3962.0,8140.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0063/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55087354624955,41.73020838418268]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54736048269417,41.730222310971925]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5473328564581,41.726285878907355]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55084592001347,41.72627195211811]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p64","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0064/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5020.3,8180.0 5571.3,8504.0 478.9,8504.0 480.5,336.6 5031.8,350.0 5020.3,8180.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2992.0,4232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5468801,41.7283121]}},{"type":"Feature","properties":{"resourceCoords":[2992.0,344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5469248,41.7301267]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0065/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"604.8,8192.6 641.9,217.4 4609.0,224.2 4648.0,4338.5 3209.8,5885.3 1539.9,8504.0 1134.2,8504.0 604.8,8192.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0065/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54604280414382,41.7302346377253]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54256546047976,41.73029129849058]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54245306378108,41.72639489464062]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54593040744514,41.726338233875346]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0066/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0066/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5704.0,1381.4 5704.0,8504.0 4908.0,8504.0 1653.8,6111.4 1063.8,5455.9 564.6,4419.0 -0.0,5014.8 -0.0,853.7 539.1,859.7 537.6,1299.8 5704.0,1381.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54324606866751,41.73056440475482]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.53980844532066,41.73064492414104]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.53964871996064,41.72679304777102]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5430863433075,41.7267125283848]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0067/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4838.9,301.5 5704.0,305.7 5704.0,8504.0 -0.0,8504.0 -0.0,-0.0 4840.0,0.0 4838.9,301.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0067/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58088818340516,41.7279988171241]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57739344128888,41.7280570893691]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57727785193357,41.72414105484642]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58077259404986,41.72408278260142]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p68","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0068/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4690.5,321.7 4666.7,8504.0 -0.0,8504.0 -0.0,-0.0 3021.6,0.0 4690.5,321.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4720.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5754009,41.7242903]}},{"type":"Feature","properties":{"resourceCoords":[788.0,336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5779194,41.7279094]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0069/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"789.2,8504.0 883.9,0.0 2854.2,0.0 2853.5,282.8 4835.5,292.7 4809.5,8190.2 5704.0,8194.9 5704.0,8504.0 789.2,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0069/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57603405318011,41.728058189349]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57252575658855,41.72811720585023]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57240869085756,41.724185984945684]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57591698744912,41.72412696844445]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p7","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0007/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5027.3,8214.3 157.5,8207.4 186.7,285.6 -0.0,285.1 -0.0,-0.0 5684.0,0.0 5684.0,297.3 4930.0,294.4 5027.3,8214.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4100.0,4248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6047777,41.7348249]}},{"type":"Feature","properties":{"resourceCoords":[172.0,4248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6072054,41.734786]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0070/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4659.2,8504.0 1654.8,8504.0 1654.6,8201.6 758.7,8197.4 781.0,287.8 4738.1,306.0 4659.2,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57353938211507,41.7280978682981]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57003639894135,41.72815551040251]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5699220594134,41.72423024566022]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57342504258712,41.724172603555814]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p71","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"18"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0071/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2433.4,229.2 2435.2,0.0 4580.0,0.0 4577.8,247.6 5083.1,252.1 5064.0,2244.0 5704.0,2249.0 5704.0,4203.5 4579.8,4193.6 4573.1,8154.6 5704.0,8164.5 5704.0,8504.0 561.2,8407.6 675.3,214.1 2433.4,229.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5064.0,2244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5678762,41.7271201]}},{"type":"Feature","properties":{"resourceCoords":[628.0,8120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.570527,41.7243533]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p72","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"18"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0072/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"753.0,4247.8 1868.0,4252.3 1858.8,2313.9 1224.0,2312.0 1233.5,336.4 732.4,334.3 733.7,0.0 3545.9,0.0 3546.3,345.3 4640.7,349.5 4663.0,8191.8 4372.9,8190.7 4370.7,8488.1 1888.2,8504.0 1886.7,8180.7 765.1,8176.2 753.0,4247.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1224.0,2312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5678762,41.7271201]}},{"type":"Feature","properties":{"resourceCoords":[2720.0,8184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5668642,41.7244007]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p73","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0073/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5704.0,8504.0 -0.0,8504.0 -0.0,8204.3 294.5,8203.3 212.9,301.9 5704.0,283.7 5704.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0073/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56590324089156,41.72820603456544]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5623955461395,41.728243060370446]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5623221012187,41.72431252231832]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56582979597076,41.724275496513314]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0074/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4705.9,8504.0 595.7,8491.1 647.2,1430.4 5346.0,1426.1 5328.6,8192.5 4707.2,8190.0 4705.9,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56279923094273,41.72822581204924]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55929639444143,41.72828202099032]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55918489752902,41.724356928465674]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56268773403032,41.72430071952459]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p75","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0075/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0075/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5018.7,8504.0 -0.0,8504.0 -0.0,8057.0 611.2,8056.8 598.2,215.2 2828.0,214.0 2828.0,0.0 3509.7,0.0 3504.3,213.7 4819.1,213.2 5033.5,213.0 5018.7,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2828.0,4144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5580769,41.7263371]}},{"type":"Feature","properties":{"resourceCoords":[2828.0,8056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5580354,41.7245149]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p76","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0076/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4806.4 421.1,4748.5 436.3,1300.6 4901.4,1300.0 4887.5,8504.0 -0.0,8504.0 -0.0,4806.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[436.0,4356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5566582,41.7245327]}},{"type":"Feature","properties":{"resourceCoords":[436.0,432.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5566997,41.7263539]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0077/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0077/info.json","type":"ImageService2","height":8504,"width":5704},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5048.8,830.0 5049.0,58.0 5399.3,57.4 5704.0,358.0 5704.0,8504.0 574.1,8426.0 596.4,830.5 5048.8,830.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0077/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55429549576883,41.72656410160236]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5507592361131,41.72661226167594]}},{"type":"Feature","properties":{"resourceCoords":[5704.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55066370752883,41.72264961440587]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55419996718456,41.722601454332285]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0078/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0078/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4734.8,3546.3 4438.0,3728.9 5676.0,4855.0 5676.0,8418.3 4683.7,8504.0 921.3,8490.7 936.5,304.7 4742.7,368.9 4734.8,3546.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0078/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55133652247079,41.726577102340954]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54783580651716,41.72662966086854]}},{"type":"Feature","properties":{"resourceCoords":[5676.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54773103904853,41.72268749092376]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55123175500216,41.722634932396176]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p79","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0079/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0079/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"331.5,8040.9 832.1,8083.9 844.3,6289.5 202.7,5705.6 352.0,5612.6 352.1,4167.8 2954.0,4165.2 3082.6,4243.2 4041.2,2714.6 4951.5,1758.3 5067.4,2069.8 5307.0,2411.9 5676.0,2725.0 5676.0,8504.0 336.2,8504.0 331.5,8040.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1636.0,4000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5468347,41.7264704]}},{"type":"Feature","properties":{"resourceCoords":[352.0,4000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5484069,41.72645]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p8","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"10"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0008/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3430.6,8201.8 -0.0,8155.0 -0.0,273.5 750.2,285.6 753.7,0.0 5047.9,0.0 5043.4,356.0 5684.0,375.7 5684.0,8508.0 4585.2,8508.0 4595.0,7918.1 3493.2,7899.7 3430.6,8201.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4240.0,4260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6016012,41.7348758]}},{"type":"Feature","properties":{"resourceCoords":[5044.0,356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.601184,41.7366967]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0080__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 | 1947 | sanborn01790_064 p80 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5676.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0080__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0080/info.json","type":"ImageService2","height":8504,"width":5676},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8504.0 536.0,8504.0 1068.0,8504.0 5676.0,8504.0 5676.0,2395.6 2802.4,2396.8 2792.8,0.0 1889.1,0.0 1836.8,3720.2 1433.9,3714.7 -0.0,2622.8 -0.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0080__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2384.0,4756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5389413,41.7258945]}},{"type":"Feature","properties":{"resourceCoords":[2984.0,5848.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5381675,41.72495]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1947 | sanborn01790_064 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-20T23:00:54Z","modified":"2026-09-20T23:00:54Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0009/info.json","type":"ImageService2","height":8508,"width":5684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5684.0,8271.6 120.5,8238.3 144.7,4370.3 710.5,4364.6 666.7,207.9 640.3,203.0 336.8,201.1 337.2,0.0 5684.0,0.0 5684.0,8271.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790194747:01790_47_1947-0009/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.60159589228101,41.73687186589881]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59474017614576,41.73699277679354]}},{"type":"Feature","properties":{"resourceCoords":[5684.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.59449935276275,41.72928078723276]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8508.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.601355068898,41.72915987633803]}}]}}]}