{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01790_108.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1951 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"134"},{"label":"placed","value":"131"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef 90, georef-snap 41"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"1 sheet(s) cut into 2 panels"},{"label":"unplaced pages","value":"p0 (tier 1, 41.90252,-87.76863 +/-254m); p113 (tier 2, 41.90538,-87.74274 +/-100m); p93__2 (tier 1, 41.91236,-87.74038 +/-119m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0001/info.json","type":"ImageService2","height":8504,"width":5896},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8361.2 -0.0,-0.0 5896.0,0.0 5896.0,444.5 5018.3,438.2 5030.9,8504.0 4492.2,8504.0 4492.2,8375.0 -0.0,8361.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2528.0,4408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7746841,41.9293294]}},{"type":"Feature","properties":{"resourceCoords":[2528.0,420.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7747458,41.9311668]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0010/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 5211.5,0.0 5210.2,408.5 5880.0,419.2 5880.0,7790.1 -0.0,7731.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3116.0,6376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7464757,41.9288185]}},{"type":"Feature","properties":{"resourceCoords":[3116.0,384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7465946,41.9315419]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p100","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0100/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0100/info.json","type":"ImageService2","height":8504,"width":5828},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5404.5,8242.5 -0.0,8227.4 -0.0,325.6 5366.0,336.0 5404.5,8242.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5368.0,336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.769535,41.9093346]}},{"type":"Feature","properties":{"resourceCoords":[1452.0,8220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7718531,41.9056897]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p101","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0101/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0101/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5876.0,8260.6 623.0,8265.7 554.0,280.0 5195.8,271.1 5238.5,4278.5 5876.0,4277.5 5876.0,8260.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2608.0,8264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7682097,41.9057281]}},{"type":"Feature","properties":{"resourceCoords":[552.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.769535,41.9093346]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p102","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0102/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0102/info.json","type":"ImageService2","height":8504,"width":5828},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"592.8,8232.9 635.1,4265.2 -0.0,4259.5 -0.0,267.2 5359.3,316.2 5359.8,8279.0 592.8,8232.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1304.0,8240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7657834,41.9057572]}},{"type":"Feature","properties":{"resourceCoords":[3336.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7646661,41.9093957]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p103","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0103/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0103/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"449.5,8293.5 459.7,301.1 5212.0,349.8 5125.0,8344.9 449.5,8293.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2496.0,8316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7620553,41.9058021]}},{"type":"Feature","properties":{"resourceCoords":[2496.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7621875,41.9094268]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p104","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0104/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0104/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8247.5 -0.0,361.0 5406.1,357.4 5459.2,8248.2 -0.0,8247.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3400.0,8248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7583524,41.9058465]}},{"type":"Feature","properties":{"resourceCoords":[1368.0,360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7596871,41.9094583]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p105","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0105/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0105/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5852.0,8104.0 4491.6,8103.3 4491.3,8379.4 533.4,8388.8 460.0,456.0 5852.0,439.1 5852.0,8104.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2520.0,8384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7558592,41.9058765]}},{"type":"Feature","properties":{"resourceCoords":[460.0,456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7571922,41.9094897]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p106","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0106/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0106/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"710.3,8122.5 749.5,451.0 5374.8,464.5 5358.9,8399.4 1356.0,8380.0 1357.1,8126.1 710.3,8122.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1356.0,8380.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7534143,41.9059134]}},{"type":"Feature","properties":{"resourceCoords":[3380.0,456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7522633,41.9095517]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p107","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0107/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0107/info.json","type":"ImageService2","height":8504,"width":5900},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"368.0,8452.0 368.0,410.0 5900.0,454.8 5900.0,8468.0 368.0,8452.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[368.0,8452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7509563,41.905939]}},{"type":"Feature","properties":{"resourceCoords":[368.0,408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7510384,41.909565]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p108","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0108/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0108/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"627.0,565.6 5224.9,557.9 5207.6,4397.4 5006.8,4398.4 5049.3,7973.3 3148.6,7973.5 3144.0,8356.0 634.8,8351.4 627.0,565.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3144.0,8356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7460506,41.90599]}},{"type":"Feature","properties":{"resourceCoords":[3144.0,452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7461282,41.9096328]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0109/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0109/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"271.5,400.2 5733.6,277.6 5868.0,415.6 5868.0,8504.0 3709.4,8504.0 3715.2,8022.6 -0.0,7977.6 -0.0,4323.1 206.7,4324.6 271.5,400.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0109/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74500853534029,41.90977614208807]}},{"type":"Feature","properties":{"resourceCoords":[5868.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74147946980702,41.90985006899879]}},{"type":"Feature","properties":{"resourceCoords":[5868.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74133652089265,41.90601699050816]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74486558642592,41.905943063597434]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0011/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"58.4,728.6 53.4,0.0 5872.0,0.0 5843.4,8504.0 616.8,8504.0 609.7,8109.6 801.8,8110.3 728.9,732.7 58.4,728.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2000.0,2992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7440981,41.9305536]}},{"type":"Feature","properties":{"resourceCoords":[5324.0,5208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7420382,41.9295812]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p110","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0110/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0110/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5864.0,8504.0 291.9,8504.0 297.2,0.0 5864.0,0.0 5864.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0110/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74623369708331,41.90616416795937]}},{"type":"Feature","properties":{"resourceCoords":[5864.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74263934672076,41.90620686327189]}},{"type":"Feature","properties":{"resourceCoords":[5864.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74255618653929,41.902325862256674]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74615053690184,41.90228316694415]}},{"type":"Feature","properties":{"resourceCoords":[292.0,8344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7459731,41.9023574]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p111","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0111/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0111/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,46.8 5876.0,352.7 5876.0,8504.0 151.3,8504.0 261.4,322.5 -0.0,46.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0111/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74155620302348,41.90973395118388]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73976554095485,41.90978954417104]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7396581897606,41.90784727376406]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74144885182923,41.9077916807769]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p112","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0112/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0112/info.json","type":"ImageService2","height":8504,"width":5908},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5465.2,392.8 5495.6,7868.1 -0.0,7978.1 -0.0,363.5 5465.2,392.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0112/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73960925462735,41.90987861214861]}},{"type":"Feature","properties":{"resourceCoords":[5908.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73601401911868,41.90989173075904]}},{"type":"Feature","properties":{"resourceCoords":[5908.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7359888239973,41.90601322666156]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73958405950597,41.906000108051124]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p114","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0114/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0114/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8504.0 -0.0,-0.0 5718.8,0.0 5667.4,8504.0 -0.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0114/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73974637624397,41.90623695457365]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73614289142344,41.90630419281279]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7360122838988,41.902423916248374]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73961576871933,41.902356678009234]}},{"type":"Feature","properties":{"resourceCoords":[5668.0,8296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7361454,41.9025164]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p115","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0115/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0115/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5005.4,422.6 5099.9,8504.0 1029.8,8504.0 1058.8,252.7 2070.8,224.8 1638.0,0.0 5876.0,0.0 5876.0,189.2 5404.9,191.7 5408.6,419.1 5005.4,422.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0115/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73690139427676,41.90991445684591]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73335980420558,41.90993764349623]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73331503026576,41.90609620467115]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73685662033694,41.906073018020834]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p116","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0116/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0116/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5009.0,435.1 5020.0,8252.0 974.6,8251.9 994.1,415.0 1392.0,417.0 1391.5,187.9 3016.5,205.6 3016.4,425.0 5009.0,435.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3016.0,2940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7326126,41.9086169]}},{"type":"Feature","properties":{"resourceCoords":[5020.0,8252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7313151,41.9062237]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p117","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0117/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0117/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4993.2,8327.5 984.0,8312.0 957.9,483.0 4986.4,281.2 4993.2,8327.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3000.0,5252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7301249,41.9076316]}},{"type":"Feature","properties":{"resourceCoords":[984.0,8312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7313151,41.9062237]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p118","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0118/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0118/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4487.6,8241.4 960.0,8224.0 967.2,393.4 5233.0,418.8 5261.3,209.7 5730.6,211.6 5731.4,0.0 5880.0,0.0 5880.0,8504.0 4955.2,8504.0 4487.6,8241.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0118/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2968.0,7388.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7276577,41.9066544]}},{"type":"Feature","properties":{"resourceCoords":[960.0,8224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7288706,41.9062546]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p119","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0119/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0119/info.json","type":"ImageService2","height":8504,"width":5896},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5108.0,8504.0 -0.0,8504.0 -0.0,-0.0 504.5,0.0 505.4,177.0 5081.5,191.7 5108.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0119/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2528.0,4252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7742104,41.9038279]}},{"type":"Feature","properties":{"resourceCoords":[4560.0,8288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7729368,41.9020325]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p12","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"16"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0012/info.json","type":"ImageService2","height":8504,"width":5892},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5172.3,8142.0 927.0,8069.8 904.1,0.0 5892.0,0.0 5892.0,692.0 5096.9,692.6 5172.3,8142.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5136.0,5200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7391724,41.9296151]}},{"type":"Feature","properties":{"resourceCoords":[384.0,5200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7420382,41.9295812]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p120","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0120/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0120/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,224.8 5382.9,259.3 5416.1,8480.0 -0.0,8504.0 -0.0,224.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3420.0,4244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7705664,41.9038771]}},{"type":"Feature","properties":{"resourceCoords":[5416.0,8212.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7692891,41.9020888]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p121","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0121/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0121/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4400.0,280.0 4403.1,8504.0 412.4,8504.0 408.5,240.2 4400.0,280.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4400.0,8256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7668599,41.9021263]}},{"type":"Feature","properties":{"resourceCoords":[4400.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7669868,41.9057429]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p122","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0122/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0122/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,245.7 4952.0,296.0 4958.0,8504.0 -0.0,8504.0 -0.0,245.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1960.0,4244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7657198,41.9039423]}},{"type":"Feature","properties":{"resourceCoords":[4952.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7639493,41.9057793]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p123","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0123/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0123/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"541.2,308.2 5286.0,318.0 5409.4,8504.0 613.1,8504.0 541.2,308.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[576.0,4308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7638838,41.9039672]}},{"type":"Feature","properties":{"resourceCoords":[5288.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7610605,41.905814]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p124","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0124/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0124/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"546.3,346.0 4939.9,366.9 4940.1,8504.0 646.4,8432.3 546.3,346.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4940.0,6288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7582761,41.9031305]}},{"type":"Feature","properties":{"resourceCoords":[4940.0,4300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7583017,41.9040424]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p125","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0125/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0125/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5141.7,358.6 5098.8,8504.0 1061.2,8490.8 1084.0,328.0 5141.7,358.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5120.0,4296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7558152,41.904076]}},{"type":"Feature","properties":{"resourceCoords":[1084.0,328.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7583524,41.9058465]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p126","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0126/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0126/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5880.0,8504.0 228.5,8504.0 186.4,281.8 2159.0,276.2 2159.1,0.0 4167.2,0.0 4167.5,253.8 5880.0,252.5 5880.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0126/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[216.0,6236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7557926,41.9031549]}},{"type":"Feature","properties":{"resourceCoords":[4200.0,8204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7533297,41.9022794]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p127","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0127/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0127/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"627.0,300.3 5884.0,322.3 5884.0,8504.0 586.6,8504.0 627.0,300.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2924.0,2292.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7509341,41.9050358]}},{"type":"Feature","properties":{"resourceCoords":[2924.0,8284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7508675,41.9023055]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p128","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0128/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0128/info.json","type":"ImageService2","height":8504,"width":5860},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5665.1,305.6 5660.7,8373.7 5860.0,8373.8 5860.0,8504.0 665.7,8412.7 651.5,293.4 5665.1,305.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1696.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7484193,41.9023315]}},{"type":"Feature","properties":{"resourceCoords":[1696.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7484994,41.9059645]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p129","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0129/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0129/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4963.7,437.2 5071.2,8504.0 1020.3,8476.1 923.8,443.7 4963.7,437.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0129/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73679887455563,41.90627600904936]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73322578747084,41.90629510632888]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73318896243815,41.90242455224882]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73676204952294,41.90240545496929]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p13","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0013/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1500.6,237.9 1432.8,0.0 4911.8,7.7 4902.7,8342.4 4918.4,8342.5 4917.9,8504.0 658.4,8504.0 648.2,231.3 1500.6,237.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[652.0,2464.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7392034,41.9306196]}},{"type":"Feature","properties":{"resourceCoords":[4612.0,8340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7366895,41.9279858]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p130","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0130/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0130/info.json","type":"ImageService2","height":8504,"width":5860},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"984.0,280.0 4993.6,271.1 4999.9,8416.8 5860.0,8377.9 5860.0,8504.0 982.3,8480.2 984.0,280.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5000.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7312112,41.9025992]}},{"type":"Feature","properties":{"resourceCoords":[984.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7337852,41.9061819]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p131","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0131/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0131/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"956.8,8504.0 809.7,292.2 3813.9,252.2 4064.7,8504.0 956.8,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0131/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73180385576379,41.90635442957577]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72825652481588,41.90636385109692]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72823835739435,41.90252120297622]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73178568834226,41.90251178145507]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p132","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0132/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0132/info.json","type":"ImageService2","height":8504,"width":5860},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4549.3,340.0 5040.3,623.0 5860.0,616.3 5860.0,8504.0 -0.0,8504.0 -0.0,266.2 4549.3,340.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0132/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4548.0,340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7267194,41.9062828]}},{"type":"Feature","properties":{"resourceCoords":[4996.0,6264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.726324,41.9035924]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p14","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0014/info.json","type":"ImageService2","height":8504,"width":5892},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8238.1 -0.0,-0.0 5675.7,0.0 5677.0,287.5 5125.5,284.5 5120.7,4246.7 5120.7,4246.7 5115.8,8260.6 -0.0,8238.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3680.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.734289,41.9298711]}},{"type":"Feature","properties":{"resourceCoords":[3680.0,276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7343464,41.9316989]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p15","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0015/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0015/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5872.0,8353.0 -0.0,8333.6 -0.0,308.9 554.8,311.3 553.9,135.5 553.0,0.0 5872.0,0.0 5872.0,8353.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2536.0,8344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.731779,41.9280546]}},{"type":"Feature","properties":{"resourceCoords":[2536.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7318341,41.9299053]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0016/info.json","type":"ImageService2","height":8504,"width":5892},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"841.1,8320.5 882.2,0.0 5892.0,0.0 5892.0,8304.6 841.1,8320.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0016/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73037153746861,41.931852477661536]}},{"type":"Feature","properties":{"resourceCoords":[5892.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7267993555601,41.931925399690456]}},{"type":"Feature","properties":{"resourceCoords":[5892.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72665887550937,41.928062631187395]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73023105741788,41.927989709158474]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p17","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0017/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4470.8,285.2 4470.9,415.3 4979.2,415.3 5004.4,8284.2 12.8,8270.0 -0.0,271.7 4470.8,285.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2492.0,4280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7745612,41.9256751]}},{"type":"Feature","properties":{"resourceCoords":[2492.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7746226,41.9275041]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p18","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0018/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5445.5,8331.6 -0.0,8299.1 34.7,404.2 5464.0,288.0 5445.5,8331.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3448.0,8320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7708514,41.9239075]}},{"type":"Feature","properties":{"resourceCoords":[5464.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7697594,41.9275796]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0019/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"503.0,353.2 5831.9,522.6 5880.0,4353.2 4922.4,4345.0 4913.5,7962.0 474.4,8005.9 503.0,353.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0019/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77007596980674,41.92773583025014]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7664509138047,41.92781673874213]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76629474033248,41.923888540367464]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76991979633452,41.923807631875476]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0002/info.json","type":"ImageService2","height":8504,"width":5920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5430.8,8381.7 -0.0,8504.0 -0.0,343.2 891.0,351.3 891.6,0.0 5436.5,0.0 5430.8,8381.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77320884496378,41.931343911019525]}},{"type":"Feature","properties":{"resourceCoords":[5920.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76959763632279,41.93141623744315]}},{"type":"Feature","properties":{"resourceCoords":[5920.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7694589637946,41.92752970562139]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7730701724356,41.92745737919776]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p20","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0020/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1479.2,453.4 1479.5,311.1 5864.0,339.0 5864.0,8329.4 -0.0,8277.6 -0.0,4279.6 963.0,4285.1 905.1,406.3 1479.2,453.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1472.0,4288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7660588,41.9258109]}},{"type":"Feature","properties":{"resourceCoords":[3496.0,8304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7647509,41.924003]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p21","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0021/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"895.3,8196.1 840.6,227.8 5022.8,208.3 5053.5,8211.8 895.3,8196.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4528.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7610645,41.924049]}},{"type":"Feature","properties":{"resourceCoords":[496.0,4204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7635939,41.9258444]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0022/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8165.2 -0.0,190.3 4953.6,224.0 4970.8,8202.1 -0.0,8165.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76086287514248,41.92780190470734]}},{"type":"Feature","properties":{"resourceCoords":[5872.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75726469330515,41.92786738732308]}},{"type":"Feature","properties":{"resourceCoords":[5872.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75713812327623,41.923963002137704]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76073630511357,41.92389751952196]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0023/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8359.2 -0.0,350.2 5461.7,395.1 5461.1,0.0 5880.0,0.0 5880.0,8407.9 -0.0,8359.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2512.0,8384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7561504,41.9241104]}},{"type":"Feature","properties":{"resourceCoords":[2512.0,372.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7562797,41.9277745]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p24","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0024/info.json","type":"ImageService2","height":8504,"width":5892},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"738.9,8379.1 714.3,296.5 5379.0,319.0 5412.8,8399.4 738.9,8379.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1360.0,4288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7537593,41.9260006]}},{"type":"Feature","properties":{"resourceCoords":[5404.0,6296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7512675,41.9251322]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0025/info.json","type":"ImageService2","height":8504,"width":5888},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5140.1,8493.4 426.8,8456.8 421.3,500.9 5030.5,540.1 5140.1,8493.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0025/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75163436577589,41.92806703245954]}},{"type":"Feature","properties":{"resourceCoords":[5888.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74801734590793,41.928139947763555]}},{"type":"Feature","properties":{"resourceCoords":[5888.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74787679175473,41.92422580373249]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7514938116227,41.92415288842847]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0026/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"311.8,584.0 316.4,0.0 5884.0,101.9 5884.0,8504.0 -0.0,8405.6 -0.0,577.3 311.8,584.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74854987261031,41.92815063031541]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74487889664837,41.92826257794128]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74466295558385,41.924287346988336]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74833393154579,41.92417539936246]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0027/info.json","type":"ImageService2","height":8504,"width":5888},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5888.0,497.8 5888.0,8337.7 1030.5,8257.6 925.9,473.8 5888.0,497.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74547023593307,41.92825199285295]}},{"type":"Feature","properties":{"resourceCoords":[5888.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74168436837387,41.92832929139585]}},{"type":"Feature","properties":{"resourceCoords":[5888.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74153536474662,41.924232434595524]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74532123230583,41.924155136052626]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0028/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5122.4,86.2 5147.9,8399.8 1144.5,8388.1 1085.8,0.0 5122.4,86.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0028/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74237180083442,41.92828706968188]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73864044432261,41.928343683771246]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73853123854676,41.92430307466802]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74226259505856,41.92424646057865]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0029/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"564.8,8361.1 565.5,984.0 4661.1,980.4 4647.1,8383.5 564.8,8361.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0029/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73948391236416,41.928330411920385]}},{"type":"Feature","properties":{"resourceCoords":[5868.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73574535282378,41.92839597591147]}},{"type":"Feature","properties":{"resourceCoords":[5868.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73561853819317,41.92433653134002]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73935709773355,41.92427096734893]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0003/info.json","type":"ImageService2","height":8504,"width":5912},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5912.0,8504.0 546.7,8374.6 514.0,0.0 5912.0,0.0 5912.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7702078240474,41.931417604593776]}},{"type":"Feature","properties":{"resourceCoords":[5912.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76658624324129,41.93147763974286]}},{"type":"Feature","properties":{"resourceCoords":[5912.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76647098114147,41.927574672572014]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77009256194758,41.92751463742293]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0030/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5733.1,406.3 5743.4,8305.9 -0.0,8270.3 -0.0,390.9 5733.1,406.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73650689067242,41.928167070676814]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73291125469643,41.92822502935928]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73279945539218,41.92433138486984]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73639509136817,41.92427342618737]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p31","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0031/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4791.4,8225.7 378.1,8193.4 380.6,267.8 4888.9,286.3 4791.4,8225.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2368.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7316673,41.9244349]}},{"type":"Feature","properties":{"resourceCoords":[2368.0,276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.731779,41.9280546]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p32","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0032/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8201.6 -0.0,261.0 5825.8,154.8 5884.0,0.0 5884.0,8172.3 -0.0,8201.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0032/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.730234375521,41.928195459362115]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72662751297493,41.92822414849417]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72657182339545,41.9243428750756]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73017868594151,41.92431418594355]}},{"type":"Feature","properties":{"resourceCoords":[5576.0,8172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7267628,41.9244929]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p33","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0033/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8504.0 -0.0,130.6 5043.5,121.1 5021.1,8479.5 5067.2,8504.0 1385.5,7504.1 87.7,7508.6 91.1,8504.0 -0.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2504.0,4120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7744383,41.9220253]}},{"type":"Feature","properties":{"resourceCoords":[4496.0,4120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7732167,41.9220438]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0034/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5476.6,8504.0 -0.0,8504.0 -0.0,4162.0 -0.0,179.3 5394.9,156.9 5476.6,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77293280753013,41.92395567721863]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76933506971582,41.924003667151595]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76924250573607,41.92010748896578]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77284024355038,41.92005949903282]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0035/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"499.3,8267.0 599.7,0.0 5105.2,0.0 5101.1,335.9 5884.0,349.8 5884.0,8369.2 499.3,8267.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0035/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77000059722938,41.92403339050541]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76642762832316,41.924139690332495]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7662225945897,41.92027034358838]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76979556349593,41.92016404376129]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p36","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0036/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"752.4,308.9 5884.0,370.3 5884.0,8504.0 1451.9,8504.0 1452.8,8276.6 830.6,8271.2 752.4,308.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1440.0,4312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7659238,41.9221548]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7659967,41.9239875]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p37","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0037/info.json","type":"ImageService2","height":8508,"width":5848},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5007.3,8320.3 4536.0,8316.0 4536.0,8508.0 961.0,8469.4 929.9,222.5 5042.1,260.5 5007.3,8320.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4536.0,8316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.760938,41.9204046]}},{"type":"Feature","properties":{"resourceCoords":[4536.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7610645,41.924049]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p38","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0038/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5495.8,8261.5 -0.0,8234.8 -0.0,269.4 5508.0,294.3 5495.8,8261.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3508.0,8252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7584939,41.9204348]}},{"type":"Feature","properties":{"resourceCoords":[3508.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7585993,41.9240798]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p39","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0039/info.json","type":"ImageService2","height":8504,"width":5804},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"504.9,8259.3 511.3,268.0 5804.0,282.5 5804.0,8281.3 504.9,8259.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4524.0,8276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7548068,41.9204805]}},{"type":"Feature","properties":{"resourceCoords":[508.0,4280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7573201,41.9222654]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p4","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0004/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1414.8,8504.0 842.1,8504.0 815.5,0.0 5876.0,0.0 5876.0,133.1 5363.9,133.7 5424.0,8356.0 1413.9,8361.9 1414.8,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1376.0,2344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7662137,41.9303741]}},{"type":"Feature","properties":{"resourceCoords":[5424.0,8356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.763658,41.9276626]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0040/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"652.8,8228.0 677.6,258.4 5376.0,282.0 5351.6,8260.0 652.8,8228.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3368.0,8244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7523509,41.9205126]}},{"type":"Feature","properties":{"resourceCoords":[5376.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7512324,41.9241799]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p41","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0041/info.json","type":"ImageService2","height":8504,"width":5804},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"521.6,8414.0 510.5,406.4 4546.9,406.7 4546.9,407.2 4938.8,407.2 4998.6,8428.7 521.6,8414.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4560.0,4400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7487019,41.922394]}},{"type":"Feature","properties":{"resourceCoords":[516.0,4400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7511814,41.9223581]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0042/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,403.3 5211.6,448.3 5134.5,8371.9 -0.0,8316.9 -0.0,403.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74852404209605,41.92440535335116]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7448958278243,41.92447907047646]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74475354293233,41.92054724365755]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74838175720409,41.920473526532255]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0043/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0043/info.json","type":"ImageService2","height":8504,"width":5804},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5723.6,8362.4 -0.0,8355.5 -0.0,321.3 5676.5,330.8 5723.6,8362.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74530426535047,41.92441461007502]}},{"type":"Feature","properties":{"resourceCoords":[5804.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74176698033149,41.924460662628384]}},{"type":"Feature","properties":{"resourceCoords":[5804.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74167692818128,41.92057717990305]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74521421320026,41.92053112734968]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p44","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0044/info.json","type":"ImageService2","height":8504,"width":5916},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"434.0,8367.5 416.8,295.7 5070.0,312.0 5069.9,8387.9 434.0,8367.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5072.0,6360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.738922,41.9215975]}},{"type":"Feature","properties":{"resourceCoords":[5072.0,312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7389994,41.9243455]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0045/info.json","type":"ImageService2","height":8504,"width":5804},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"361.6,8335.9 434.2,311.5 5804.0,381.1 5804.0,4396.6 5804.0,8410.3 361.6,8335.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73927001341266,41.92448190792385]}},{"type":"Feature","properties":{"resourceCoords":[5804.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73572895742907,41.92456188903667]}},{"type":"Feature","properties":{"resourceCoords":[5804.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73557256041767,41.92067427196128]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73911361640126,41.92059429084846]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p46","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0046/info.json","type":"ImageService2","height":8504,"width":5864},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"934.7,8358.1 824.7,360.1 5418.2,362.5 5470.0,8356.2 934.7,8358.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1472.0,4360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7352827,41.9225564]}},{"type":"Feature","properties":{"resourceCoords":[5444.0,4360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7328322,41.9225859]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0047/info.json","type":"ImageService2","height":8504,"width":5776},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"346.8,8332.5 388.4,387.5 5776.0,455.0 5776.0,4425.2 4795.7,4413.5 4758.0,8383.5 346.8,8332.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0047/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73313402433833,41.92459461502387]}},{"type":"Feature","properties":{"resourceCoords":[5776.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7295747041214,41.92466942063256]}},{"type":"Feature","properties":{"resourceCoords":[5776.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72942771812195,41.92074281408288]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73298703833888,41.92066800847419]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0048/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0048/info.json","type":"ImageService2","height":8504,"width":5896},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8398.4 -0.0,4401.7 535.7,4403.1 986.9,4404.2 949.0,407.6 5836.8,422.2 5896.0,0.0 5896.0,8410.8 -0.0,8398.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0048/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7301525329638,41.92463825544557]}},{"type":"Feature","properties":{"resourceCoords":[5896.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72654256671238,41.92468844685861]}},{"type":"Feature","properties":{"resourceCoords":[5896.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72644595244175,41.92078702567227]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73005591869317,41.92073683425923]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p49","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0049/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 1309.7,0.0 5820.0,1241.5 5820.0,8504.0 -0.0,8504.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[472.0,5652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7755093,41.9179063]}},{"type":"Feature","properties":{"resourceCoords":[4488.0,5652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.773069,41.9179495]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0005/info.json","type":"ImageService2","height":8504,"width":5912},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"870.4,0.0 4901.8,40.9 4953.5,8190.7 922.8,8199.6 870.4,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0005/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7643227598979,41.931410370614444]}},{"type":"Feature","properties":{"resourceCoords":[5912.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76070792395983,41.93146467098112]}},{"type":"Feature","properties":{"resourceCoords":[5912.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76060367212378,41.927568972881396]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76421850806184,41.92751467251472]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p50","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0050/info.json","type":"ImageService2","height":8504,"width":5896},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5448.8,8228.0 5539.3,8228.3 5537.4,8504.0 754.4,8438.5 787.3,1211.2 -0.0,988.9 5431.0,1020.9 5448.8,8228.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3416.0,1944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7707058,41.9196589]}},{"type":"Feature","properties":{"resourceCoords":[5440.0,5608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7694067,41.9180205]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p51","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0051/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4749.5,7696.5 549.3,7824.3 476.0,223.7 4685.6,224.3 4749.5,7696.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[488.0,2104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7694667,41.9194279]}},{"type":"Feature","properties":{"resourceCoords":[4512.0,7808.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.766938,41.9168756]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p52","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0052/info.json","type":"ImageService2","height":8504,"width":5896},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5896.0,4858.9 5896.0,7718.4 1756.4,7585.0 1756.4,7544.3 -0.0,7583.7 -0.0,232.7 1752.0,248.0 1751.1,473.9 4931.0,473.7 4915.7,4579.7 5896.0,4858.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1752.0,3696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7657792,41.9187462]}},{"type":"Feature","properties":{"resourceCoords":[1752.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7658424,41.9203376]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p53","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0053/info.json","type":"ImageService2","height":8504,"width":5824},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1789.7,7680.6 1793.9,7533.1 981.5,7509.9 970.9,4680.6 -0.0,4408.0 -0.0,345.3 4676.0,378.1 4676.0,192.0 5824.0,202.5 5824.0,8390.2 4118.2,8384.8 4120.5,7682.4 1789.7,7680.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4676.0,5720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7608485,41.9178257]}},{"type":"Feature","properties":{"resourceCoords":[4676.0,192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.760938,41.9204046]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p54","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0054/info.json","type":"ImageService2","height":8504,"width":5904},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5064.1,6999.7 5904.0,7234.8 5904.0,7360.7 3414.9,7361.1 3414.7,8504.0 1729.3,8504.0 1703.0,203.3 5904.0,228.6 5904.0,4113.7 5065.9,4112.4 5064.1,6999.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2504.0,208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7597228,41.9204197]}},{"type":"Feature","properties":{"resourceCoords":[2504.0,6300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7596375,41.9176173]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p55","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0055/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0055/info.json","type":"ImageService2","height":8504,"width":5808},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5445.8,4863.2 5608.6,5484.6 5596.3,8164.8 3408.0,8021.6 -0.0,7062.5 -0.0,4153.6 844.3,4154.4 841.9,240.3 5424.7,264.9 5445.8,4863.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3408.0,8020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7559398,41.9169176]}},{"type":"Feature","properties":{"resourceCoords":[3408.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7560448,41.9204652]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p56","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0056/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0056/info.json","type":"ImageService2","height":8504,"width":5904},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"708.1,8169.0 722.5,5477.3 524.0,4244.0 542.0,235.0 5205.8,263.0 5150.1,8300.2 708.1,8169.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[524.0,4244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7547619,41.9186572]}},{"type":"Feature","properties":{"resourceCoords":[4560.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7523509,41.9205126]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p57","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0057/info.json","type":"ImageService2","height":8504,"width":5808},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,211.9 4949.3,198.2 4949.2,8186.2 -0.0,8185.1 -0.0,211.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3340.0,8184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7498202,41.9168845]}},{"type":"Feature","properties":{"resourceCoords":[3340.0,208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7498982,41.9205413]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p58","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0058/info.json","type":"ImageService2","height":8504,"width":5904},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5266.7,8190.1 -0.0,8192.4 -0.0,131.5 5308.7,138.5 5266.7,8190.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4448.0,4140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.746152,41.9187693]}},{"type":"Feature","properties":{"resourceCoords":[392.0,2152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7486478,41.9196433]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0059/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0059/info.json","type":"ImageService2","height":8504,"width":5816},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5393.4,8304.2 -0.0,8338.7 -0.0,265.8 5816.0,234.1 5816.0,4255.2 5660.7,4255.0 5359.1,4254.7 5393.4,8304.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74566692307994,41.92071398835263]}},{"type":"Feature","properties":{"resourceCoords":[5816.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74214962707839,41.920742206980144]}},{"type":"Feature","properties":{"resourceCoords":[5816.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74209456479416,41.91688841482211]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7456118607957,41.9168601961946]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p6","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0006/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"264.4,8192.4 222.1,0.0 5279.0,5.2 5334.7,8195.7 264.4,8192.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[244.0,4196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7612576,41.9295247]}},{"type":"Feature","properties":{"resourceCoords":[4284.0,8192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7587319,41.9277424]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0060/info.json","type":"ImageService2","height":8504,"width":5904},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5795.5,258.6 5810.8,8225.2 -0.0,8209.6 -0.0,4210.4 451.2,4214.8 484.8,243.9 5795.5,258.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0060/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74244782875714,41.92074376693101]}},{"type":"Feature","properties":{"resourceCoords":[5904.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73883272608124,41.92079571287263]}},{"type":"Feature","properties":{"resourceCoords":[5904.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73873287608517,41.91689379599904]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74234797876106,41.916841850057416]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p61","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0061/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0061/info.json","type":"ImageService2","height":8504,"width":5816},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5116.1,8212.3 477.1,8200.2 466.8,157.0 5071.0,171.1 5116.1,8212.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4488.0,4172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7363919,41.9188874]}},{"type":"Feature","properties":{"resourceCoords":[472.0,4172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7388447,41.9188515]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0062/info.json","type":"ImageService2","height":8504,"width":5904},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5421.2,8188.2 -0.0,8137.1 -0.0,111.5 5442.7,160.3 5421.2,8188.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0062/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73608564523467,41.92076158077208]}},{"type":"Feature","properties":{"resourceCoords":[5904.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73249850381097,41.92083004604862]}},{"type":"Feature","properties":{"resourceCoords":[5904.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73236690037844,41.916958312565484]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73595404180213,41.91688984728894]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p63","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0063/info.json","type":"ImageService2","height":8504,"width":5816},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"509.9,8186.4 512.3,132.6 5816.0,166.1 5816.0,8222.2 509.9,8186.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2516.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7314413,41.9171112]}},{"type":"Feature","properties":{"resourceCoords":[4520.0,160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7303315,41.9207819]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0064/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"665.0,8161.3 688.7,119.8 5786.9,168.8 5852.0,0.0 5852.0,8213.1 665.0,8161.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7299606666551,41.92083802980821]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72641017217829,41.920907334843875]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72627577070908,41.917041106640255]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72982626518589,41.91697180160459]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p65","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0065/info.json","type":"ImageService2","height":8504,"width":5816},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.7,7448.7 -0.0,-0.0 4679.7,0.0 4710.0,7467.5 90.7,7448.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4252.0,4452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7728831,41.9142736]}},{"type":"Feature","properties":{"resourceCoords":[2156.0,4452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.774137,41.9142547]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0066/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0066/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,42.7 5852.0,126.6 5852.0,4073.6 4705.9,4057.5 4638.3,7710.7 -0.0,7681.1 -0.0,42.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77545053384176,41.912920339214416]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77185503912197,41.91300231494282]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77169608535723,41.90908660071261]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77529158007702,41.909004624984206]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0067/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 5577.3,0.0 5555.6,7619.0 1182.4,7563.9 1182.2,7540.1 -0.0,7518.8 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0067/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77268467988735,41.916365723549156]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76915595567124,41.916430498598714]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76902913410528,41.91255058450605]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77255785832139,41.91248580945649]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p68","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0068/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5117.0,8327.1 -0.0,8299.0 -0.0,157.9 5174.8,0.0 5117.0,8327.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1640.0,8308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7680387,41.9126329]}},{"type":"Feature","properties":{"resourceCoords":[1640.0,152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7681606,41.9168527]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0069/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"968.2,8432.9 831.0,0.0 5796.0,0.0 5796.0,8342.9 968.2,8432.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0069/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76622060412076,41.91695287258835]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76262582400105,41.91694572990015]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76263980860062,41.91299321298354]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76623458872034,41.913000355671734]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p7","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0007/info.json","type":"ImageService2","height":8504,"width":5912},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8189.8 -0.0,-0.0 5246.1,25.6 5246.0,269.9 5912.0,276.9 5912.0,8248.0 -0.0,8189.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2952.0,6232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7563136,41.9286804]}},{"type":"Feature","properties":{"resourceCoords":[2952.0,8220.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7562797,41.9277745]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p70","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0070/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4333.8,0.0 4029.9,80.9 4048.4,2480.2 5852.0,2831.5 5852.0,8435.7 1701.4,8401.2 1934.0,0.0 4333.8,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[896.0,8392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.76313,41.9130622]}},{"type":"Feature","properties":{"resourceCoords":[4904.0,5504.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7607339,41.914417]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p71","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0071/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.5,2395.9 -0.0,-0.0 303.4,0.0 305.8,639.6 3769.1,626.4 3797.1,8332.0 1871.5,8331.9 1836.7,2735.5 33.5,2395.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2944.0,8332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7594581,41.9131087]}},{"type":"Feature","properties":{"resourceCoords":[4944.0,8332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7582374,41.9131258]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p72","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0072/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8387.4 -0.0,-0.0 2837.1,0.0 4862.3,569.4 5880.0,632.0 5880.0,8413.8 -0.0,8387.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0072/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75905932305544,41.91713791314619]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75529680274175,41.91720168987697]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75517371846706,41.91312384795037]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75893623878075,41.91306007121959]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p73","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0073/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1593.8,8342.9 1546.8,201.0 5355.6,375.4 5359.8,763.8 5501.6,844.0 5514.2,8348.9 1593.8,8342.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0073/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75623581389407,41.91697879716653]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75269074962522,41.91702354585806]}},{"type":"Feature","properties":{"resourceCoords":[5796.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75260313649498,41.91312569689927]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75614820076383,41.91308094820774]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0074/info.json","type":"ImageService2","height":8504,"width":5880},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.1,8330.8 141.3,807.2 -0.0,725.2 -0.0,335.8 5756.2,406.8 5880.0,8380.6 71.1,8330.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.75296196702843,41.917001578273805]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74937548090269,41.91707640853727]}},{"type":"Feature","properties":{"resourceCoords":[5880.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74923106418076,41.91318935253715]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7528175503065,41.91311452227369]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p75","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"23"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0075/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0075/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"432.0,8314.0 245.6,362.4 5680.8,382.7 5796.0,8504.0 5724.5,8033.1 5717.5,8316.5 432.0,8314.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2252.0,8312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7481121,41.913263]}},{"type":"Feature","properties":{"resourceCoords":[256.0,2344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7494125,41.9159807]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p76","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0076/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1179.2,6747.4 1005.7,373.1 5872.0,337.2 5872.0,8504.0 3982.3,8504.0 1085.4,6898.4 1179.2,6747.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4960.0,2336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7436448,41.9160468]}},{"type":"Feature","properties":{"resourceCoords":[1056.0,4316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7460406,41.9151195]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p77","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0077/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0077/info.json","type":"ImageService2","height":8504,"width":5796},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"286.0,8504.0 2.7,8342.5 1882.7,8377.0 2031.8,252.1 3884.5,276.9 3767.0,8416.8 286.0,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1088.0,4100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7436113,41.915182]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,2224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7436448,41.9160468]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p78","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0078/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0078/info.json","type":"ImageService2","height":8504,"width":5888},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,260.6 5153.9,248.3 5180.0,4228.0 5888.0,4228.5 5888.0,8504.0 -0.0,8504.0 -0.0,260.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5180.0,4228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7387422,41.9152088]}},{"type":"Feature","properties":{"resourceCoords":[5180.0,2240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7387597,41.9161141]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p79","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0079/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0079/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5134.3,8504.0 4552.1,8504.0 4553.8,8275.8 1198.1,8257.6 1226.9,4377.8 523.0,4372.1 526.4,415.6 5852.0,441.4 5852.0,4424.1 5110.9,4419.8 5134.3,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2544.0,4388.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7374981,41.9152217]}},{"type":"Feature","properties":{"resourceCoords":[2544.0,424.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7375513,41.9170372]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p8","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0008/info.json","type":"ImageService2","height":8504,"width":5888},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"666.5,251.5 -0.0,245.1 -0.0,-0.0 5724.4,0.0 5729.0,8275.6 1087.3,8232.3 1087.9,7832.1 667.3,7831.4 666.5,251.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1712.0,8240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7538266,41.9278081]}},{"type":"Feature","properties":{"resourceCoords":[1712.0,264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.753962,41.93144]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p80","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0080/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0080/info.json","type":"ImageService2","height":8504,"width":5888},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"769.3,375.0 5432.0,428.0 5392.6,8504.0 -0.0,8504.0 -0.0,4377.5 746.4,4386.1 769.3,375.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1432.0,4392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7350425,41.9152432]}},{"type":"Feature","properties":{"resourceCoords":[5432.0,428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7326651,41.9170965]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p81","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0081/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0081/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5254.2,4392.4 5852.0,4398.7 5852.0,8056.4 5564.4,8054.0 5565.7,7857.9 4564.6,7851.3 4566.3,8504.0 561.1,8504.0 593.0,356.7 5272.4,405.3 5254.2,4392.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2568.0,4364.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.731385,41.9152866]}},{"type":"Feature","properties":{"resourceCoords":[4568.0,400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.730221,41.9171259]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p82","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0082/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0082/info.json","type":"ImageService2","height":8504,"width":5856},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5741.2,8504.0 5742.6,8094.4 616.9,8075.9 600.1,4403.9 264.2,4401.8 -0.0,4400.3 -0.0,397.5 5721.9,430.8 5720.2,0.0 5856.0,0.0 5856.0,8504.0 5741.2,8504.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1292.0,4408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7289408,41.9153157]}},{"type":"Feature","properties":{"resourceCoords":[5260.0,428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7265634,41.91717]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0083/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0083/info.json","type":"ImageService2","height":8504,"width":5852},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3928.5 1149.7,3923.4 1077.0,0.0 5423.5,0.0 5430.6,723.8 5852.0,722.1 5852.0,7863.2 -0.0,7892.5 -0.0,3928.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77251197160037,41.91292204321044]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76892611569016,41.91295400690563]}},{"type":"Feature","properties":{"resourceCoords":[5852.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76886413702792,41.90904878708522]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77244999293812,41.90901682339003]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0084/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0084/info.json","type":"ImageService2","height":8504,"width":5856},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5856.0,3844.1 5856.0,7835.9 1787.8,7865.7 1771.2,663.7 5856.0,638.0 5856.0,3844.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0084/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77000090282468,41.91291685856864]}},{"type":"Feature","properties":{"resourceCoords":[5856.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7664428856943,41.91294243403944]}},{"type":"Feature","properties":{"resourceCoords":[5856.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7663933278661,41.90907018061284]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.76995134499647,41.90904460514204]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p85","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"14"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0085/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0085/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1352.0,1055.8 2691.4,1069.1 2691.3,253.9 5408.5,285.2 5411.0,8303.6 1233.2,8264.5 1352.0,1055.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2696.0,4280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7655672,41.9112025]}},{"type":"Feature","properties":{"resourceCoords":[4800.0,8296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7642185,41.9094013]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p86","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0086/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0086/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5377.2,293.7 5371.3,8293.8 -0.0,8243.1 -0.0,243.3 5377.2,293.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1376.0,8256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7630028,41.9094166]}},{"type":"Feature","properties":{"resourceCoords":[3376.0,280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7619059,41.9130748]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p87","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0087/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0087/info.json","type":"ImageService2","height":8504,"width":5868},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"864.9,247.7 5868.0,248.6 5868.0,8230.2 917.5,8220.0 864.9,247.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[892.0,4232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7606188,41.9112703]}},{"type":"Feature","properties":{"resourceCoords":[2912.0,8224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7593313,41.9094628]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p88","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0088/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0088/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1920.5,8245.8 1902.7,276.8 4855.2,270.8 4937.4,7035.5 4732.6,8245.4 1920.5,8245.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[928.0,4256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7581671,41.911305]}},{"type":"Feature","properties":{"resourceCoords":[4928.0,6264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7556851,41.9104153]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p89","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0089/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0089/info.json","type":"ImageService2","height":8504,"width":5884},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5472.4,345.4 5471.8,8425.9 293.8,8371.4 514.5,7146.6 504.3,285.8 5472.4,345.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5472.0,4368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7527104,41.9113787]}},{"type":"Feature","properties":{"resourceCoords":[5472.0,6412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7526764,41.910456]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p9","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0009/info.json","type":"ImageService2","height":8504,"width":5872},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"394.8,90.2 5283.4,67.2 5367.3,8349.2 444.1,8330.8 394.8,90.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[424.0,4360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7514342,41.9296575]}},{"type":"Feature","properties":{"resourceCoords":[424.0,6348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7514069,41.9287483]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p90","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0090/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0090/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"131.0,353.5 5721.7,417.2 5598.4,8298.0 5820.0,8365.1 104.0,8224.4 131.0,353.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5640.0,6332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7492321,41.9105028]}},{"type":"Feature","properties":{"resourceCoords":[124.0,2320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7527437,41.9122823]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p91","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0091/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0091/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"185.1,367.3 5645.8,308.7 5754.8,5353.1 5326.0,7438.7 5331.5,8453.8 2765.9,8477.3 240.8,8392.3 185.1,367.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0091/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74940887954024,41.91341134369793]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74583900532664,41.91343352697388]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74579616660407,41.90956161912663]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74936604081766,41.909539435850675]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p92","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0092/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0092/info.json","type":"ImageService2","height":8504,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"991.7,5376.0 965.8,0.0 2662.5,0.0 4055.5,765.7 4507.5,746.6 4505.8,1010.3 4814.7,1178.0 4912.1,7994.4 4768.5,8307.6 565.4,8431.3 562.9,7430.6 991.7,5376.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0092/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74653426639098,41.91347374816909]}},{"type":"Feature","properties":{"resourceCoords":[5820.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7429472874571,41.91350405534185]}},{"type":"Feature","properties":{"resourceCoords":[5820.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74288819722534,41.90957616738389]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74647517615922,41.909545860211125]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0093__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p93 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5876.0"},{"label":"split_canvas_h","value":"8504.0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0093__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0093/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"300.0,1470.5 437.0,8113.8 300.0,8420.0 5876.0,8349.8 5876.0,4176.8 3879.2,3125.6 3842.8,938.9 -0.0,1052.0 -0.0,1309.0 300.0,1470.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0093__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[300.0,1472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7435587,41.9129547]}},{"type":"Feature","properties":{"resourceCoords":[300.0,8420.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7435376,41.9096614]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p94","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0094/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0094/info.json","type":"ImageService2","height":8504,"width":5828},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3876.9,8494.1 2578.2,8481.5 2764.3,848.9 3973.7,866.9 3876.9,8494.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0094/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74173471087508,41.91360370800083]}},{"type":"Feature","properties":{"resourceCoords":[5828.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73813010798025,41.91368255327211]}},{"type":"Feature","properties":{"resourceCoords":[5828.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73797659289518,41.909740799988]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74158119579,41.90966195471672]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p95","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0095/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0095/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,374.1 1637.9,377.4 1638.6,0.0 5056.0,0.0 5080.6,6807.4 4945.1,7626.0 5844.5,8105.1 4835.3,8125.5 4798.2,8331.4 -0.0,8254.3 -0.0,374.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5056.0,4196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7361674,41.9115737]}},{"type":"Feature","properties":{"resourceCoords":[1048.0,8240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.73855,41.9097242]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p96","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0096/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0096/info.json","type":"ImageService2","height":8504,"width":5828},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"453.0,6874.9 441.4,402.0 5828.0,369.0 5828.0,8158.3 4937.6,8154.6 4939.4,7967.6 779.8,7927.7 318.0,7680.4 453.0,6874.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[432.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7361674,41.9115737]}},{"type":"Feature","properties":{"resourceCoords":[4456.0,4304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.733698,41.9116075]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p97","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0097/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0097/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"525.1,534.5 1067.2,530.5 1067.6,648.3 4919.2,623.2 4913.2,0.0 5876.0,0.0 5876.0,187.3 5484.0,186.6 5473.8,7975.6 4613.9,8177.6 768.9,8168.9 768.3,7960.9 515.4,7958.9 525.1,534.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0097/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7332427306444,41.91366819423886]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72948426975468,41.91372406920947]}},{"type":"Feature","properties":{"resourceCoords":[5876.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72937636775978,41.90964763161787]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8504.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.73313482864951,41.90959175664726]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p98","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0098/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0098/info.json","type":"ImageService2","height":8504,"width":5828},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8194.6 -0.0,-0.0 5828.0,0.0 5828.0,8209.1 5360.6,8209.1 5333.3,8417.5 1084.7,8409.8 1083.4,8196.2 -0.0,8194.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1408.0,4320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7288219,41.9116743]}},{"type":"Feature","properties":{"resourceCoords":[5368.0,4320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7263973,41.9117075]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1951 | sanborn01790_108 p99","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T04:56:28Z","modified":"2026-09-21T04:56:28Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0099/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0099/info.json","type":"ImageService2","height":8504,"width":5876},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5751.9,0.0 5748.1,304.5 5115.5,299.9 5073.2,8332.1 558.6,8295.7 558.5,8119.3 55.6,8116.8 -0.0,8504.0 -0.0,-0.0 5751.9,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790195121:01790_21_1951-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2560.0,8312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.774267,41.9056554]}},{"type":"Feature","properties":{"resourceCoords":[4576.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7731641,41.9092887]}}]}}]}