{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01790_046.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1923 | 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":"109"},{"label":"placed","value":"106"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef 68, georef-snap 37, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"3 sheet(s) cut into 6 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 41.75069,-87.56673 +/-2214m); p41__2 (tier 2, 41.76086,-87.55924 +/-180m); p46__2 (tier 1, 41.75169,-87.54726 +/-123m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"21"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0001/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.9,8184.1 -0.0,-0.0 4765.4,50.0 4808.0,8196.0 60.9,8184.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2980.0,4164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5847264,41.76425]}},{"type":"Feature","properties":{"resourceCoords":[4808.0,8196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5835752,41.7624349]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p10","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0010/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"356.0,8112.0 355.5,0.0 5314.1,0.0 5313.8,221.3 5123.0,220.5 5033.1,8128.9 356.0,8112.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[356.0,8112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5834834,41.7587929]}},{"type":"Feature","properties":{"resourceCoords":[356.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5835752,41.7624349]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p100","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0100/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0100/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"303.1,200.6 4875.9,178.8 4825.8,8143.5 289.0,8166.0 303.1,200.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[296.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5599599,41.7391016]}},{"type":"Feature","properties":{"resourceCoords":[2296.0,8156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.558704,41.7372876]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0101/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0101/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,243.0 5344.6,184.7 5392.3,8144.6 5628.0,8252.0 -0.0,8204.3 -0.0,243.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5571878598869,41.741058378127065]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55376433171199,41.741075262066104]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5537313874425,41.73730320667859]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5571549156174,41.73728632273955]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0102/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0102/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"896.1,187.1 4926.3,168.4 4922.3,8151.6 5628.0,8135.1 5628.0,8252.0 894.0,8189.2 896.1,187.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0102/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55447965989958,41.74106986492074]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55107431733248,41.74110266017502]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5510103265697,41.737350643294356]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5544156691368,41.73731784804008]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p103","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0103/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0103/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4577.8,579.4 4574.1,8169.9 133.5,8252.0 174.5,572.6 4577.8,579.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0103/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55161086480001,41.741228171584744]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54812831129975,41.74127435759904]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54803819201759,41.73743727790025]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55152074551785,41.737391091885954]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p104","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0104/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0104/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3931.8,365.2 5476.0,448.0 5483.2,8252.0 -0.0,8252.0 -0.0,-0.0 3398.7,0.0 3652.2,196.3 3931.8,365.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5476.0,4416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5453541,41.7392752]}},{"type":"Feature","properties":{"resourceCoords":[5476.0,448.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5453958,41.7411014]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p105","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0105/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0105/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3402.0,272.0 3625.5,271.9 3626.5,0.0 5628.0,0.0 5628.0,8252.0 3402.0,8136.0 3402.0,272.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3400.0,8136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5429274,41.7393122]}},{"type":"Feature","properties":{"resourceCoords":[3400.0,272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.543013,41.742944]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p11","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0011/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,149.6 5628.0,4106.2 5219.5,4109.2 5267.8,8105.0 -0.0,8145.6 -0.0,189.4 5628.0,149.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3344.0,8120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5785468,41.7588487]}},{"type":"Feature","properties":{"resourceCoords":[192.0,188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5805155,41.762468]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p12","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0012/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1208.0,4099.6 1267.4,178.5 4792.5,273.2 4783.1,8099.1 788.0,8084.0 800.4,4096.4 1208.0,4099.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2804.0,4112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5761814,41.7607042]}},{"type":"Feature","properties":{"resourceCoords":[788.0,8084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5773654,41.7588621]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p13","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0013/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"969.4,8222.2 917.5,234.0 5020.0,236.0 4982.2,8216.0 969.4,8222.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3016.0,4216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5736987,41.7607316]}},{"type":"Feature","properties":{"resourceCoords":[5020.0,236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5725136,41.7625544]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p14","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0014/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4750.3,4159.5 5628.0,4158.9 5628.0,8122.7 264.4,8135.4 295.6,209.6 4747.9,207.7 4750.3,4159.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4240.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5700597,41.7607718]}},{"type":"Feature","properties":{"resourceCoords":[4240.0,208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5700939,41.7625806]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p15","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0015/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0015/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5462.4,8146.6 880.0,8154.4 882.4,4168.4 -0.0,4168.3 -0.0,194.3 5473.5,195.6 5462.4,8146.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3464.0,4168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5676319,41.7607987]}},{"type":"Feature","properties":{"resourceCoords":[5468.0,4168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5664104,41.7608121]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p16","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"22"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0016/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5484.3,4314.0 5507.8,8083.0 222.8,8092.7 233.1,189.4 4021.8,169.6 5484.3,4314.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2856.0,6244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5647784,41.7598654]}},{"type":"Feature","properties":{"resourceCoords":[228.0,4136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5664104,41.7608121]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0017/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1357.2,4264.3 184.9,5.3 1532.2,6.0 4038.9,4501.2 4133.4,4449.4 5628.0,7016.4 5628.0,8252.0 1105.5,8041.2 1357.2,4264.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0017/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56422936179649,41.76264954050379]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56082632305004,41.762873892850905]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5603884144861,41.75912567923594]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56379145323255,41.758901326888825]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0018/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"158.5,8252.0 -0.0,8252.0 0.0,0.0 5628.0,-0.0 5628.0,2836.8 5357.1,2847.5 5318.2,8076.6 997.6,8003.0 501.1,7886.9 158.5,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5332.0,5420.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5636099,41.7651615]}},{"type":"Feature","properties":{"resourceCoords":[5332.0,8044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.564908,41.7645011]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p19","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"16"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0019/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7896.5 -0.0,184.4 4786.5,200.3 4801.2,8147.5 532.5,8141.0 529.4,7896.5 -0.0,7896.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2292.0,8144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5844878,41.7551396]}},{"type":"Feature","properties":{"resourceCoords":[2292.0,192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5845778,41.7587806]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0002/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"280.4,0.0 5628.0,0.0 5628.0,340.6 5360.5,335.1 5281.7,7963.6 230.2,7916.7 280.4,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58385124562768,41.76612529434002]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58044298303884,41.76619684836941]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58030331083543,41.76244308044337]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58371157342428,41.76237152641398]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0020/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8096.0 -0.0,130.4 5628.0,160.6 5628.0,8116.3 -0.0,8096.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58304824596554,41.758857409106454]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57962607439623,41.75890995058118]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57952352601502,41.75514043546526]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58294569758434,41.755087893990535]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p21","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0021/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"538.8,230.9 5628.0,237.3 5628.0,4205.2 4849.0,4202.3 4839.9,8191.3 560.1,8177.8 538.8,230.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4228.0,4200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5773227,41.7570536]}},{"type":"Feature","properties":{"resourceCoords":[4228.0,240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5773654,41.7588621]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p22","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0022/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5312.0,8202.0 -0.0,8210.8 -0.0,4250.1 374.3,4250.6 773.5,4251.1 764.6,311.3 5341.3,301.1 5312.0,8202.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1356.0,4252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5761064,41.7570662]}},{"type":"Feature","properties":{"resourceCoords":[5312.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5736298,41.7552773]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0023/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4816.5,8130.8 192.9,8144.1 209.2,156.1 4806.2,144.1 4816.5,8130.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0023/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57381449479558,41.75898130190249]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5704061279853,41.75901653946974]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57033735255474,41.755262237609834]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57374571936504,41.75522700004258]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p24","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0024/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8182.0 -0.0,227.7 5390.5,219.7 5394.1,8172.4 -0.0,8182.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3396.0,4208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5687866,41.7571508]}},{"type":"Feature","properties":{"resourceCoords":[3396.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5687503,41.7553382]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p25","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0025/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8227.7 352.3,8233.6 353.8,216.0 4943.1,211.8 4942.9,4235.8 5362.2,4235.9 5628.0,4235.9 5628.0,8227.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2364.0,4236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5663427,41.757179]}},{"type":"Feature","properties":{"resourceCoords":[4364.0,4236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5651279,41.7571931]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0026/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5439.0,8163.0 690.3,8169.1 690.1,4147.7 -0.0,4147.7 -0.0,93.9 5359.5,88.9 5455.9,286.9 5439.0,8163.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3436.0,4148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5627044,41.7572211]}},{"type":"Feature","properties":{"resourceCoords":[1428.0,4148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5639152,41.7572071]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0027/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.3,479.9 316.0,286.0 2274.6,163.2 2261.9,0.0 2709.8,0.0 5628.0,3685.4 5628.0,6505.7 5251.2,6508.7 5259.3,8179.5 436.8,8210.0 412.3,479.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56177704827624,41.75918977776346]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55834364374473,41.75921629512318]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55829188799612,41.755434422281276]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56172529252763,41.755407904921555]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__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 | 1923 | sanborn01790_046 p28 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3053.6"},{"label":"split_canvas_w","value":"5628.0"},{"label":"split_canvas_h","value":"5198.4"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3263.4,8252.0 2522.9,6156.4 1366.8,5811.6 1129.6,5364.0 764.9,4618.0 457.2,5627.2 96.0,5509.2 -0.0,7263.2 3263.4,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2340.0,6740.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5570054,41.7560383]}},{"type":"Feature","properties":{"resourceCoords":[96.0,5508.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5585327,41.7562316]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p28 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"13"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5628.0"},{"label":"split_canvas_h","value":"6468.8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,4828.6 3100.1,1965.3 3165.3,1906.9 1314.3,0.0 852.6,0.0 966.0,126.7 842.1,245.7 1196.8,5490.8 1366.8,5811.6 1771.4,5932.3 5628.0,5655.5 5628.0,4828.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0028__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3100.0,1964.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5542018,41.7537121]}},{"type":"Feature","properties":{"resourceCoords":[3492.0,5808.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5540829,41.7518988]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p29","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0029/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8252.0 -0.0,0.0 805.9,0.0 809.0,245.0 5628.0,252.3 5628.0,4230.5 4968.0,4228.8 4966.8,8196.1 -0.0,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2572.0,4224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5844429,41.7533226]}},{"type":"Feature","properties":{"resourceCoords":[2572.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5844878,41.7551396]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p3","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"16"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0003/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4876.9,8208.6 822.3,8196.1 822.9,311.8 1089.6,314.4 1086.4,0.0 4744.1,0.0 4691.4,347.3 4874.4,341.0 4876.9,8208.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[824.0,6284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5805361,41.7633345]}},{"type":"Feature","properties":{"resourceCoords":[4880.0,6160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5780719,41.763423]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p30","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0030/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5411.8,148.6 5415.8,8167.6 -0.0,8157.9 -0.0,4161.1 665.0,4162.5 663.8,154.7 5411.8,148.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1380.0,4164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.582136,41.7533506]}},{"type":"Feature","properties":{"resourceCoords":[3404.0,8164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5808612,41.7515528]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p31","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0031/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"307.1,280.9 5628.0,211.9 5628.0,8166.8 328.2,8168.6 307.1,280.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2304.0,4200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5784668,41.7533951]}},{"type":"Feature","properties":{"resourceCoords":[2304.0,8168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.578428,41.7515824]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p32","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0032/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"667.5,8116.0 667.8,151.7 5312.1,147.0 5314.2,8115.9 667.5,8116.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3336.0,8116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5747604,41.7516267]}},{"type":"Feature","properties":{"resourceCoords":[1324.0,8116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.575991,41.751612]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p33","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0033/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4833.2,8177.6 217.3,8174.7 220.5,162.2 4828.5,161.8 4833.2,8177.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2228.0,4180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5723679,41.7534692]}},{"type":"Feature","properties":{"resourceCoords":[2228.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5723274,41.7516558]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0034/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5416.8,8115.5 -0.0,8107.6 -0.0,137.8 5431.8,141.9 5416.8,8115.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0034/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57082818978738,41.75537520971797]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56740908336877,41.75541981864302]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56732202217901,41.75165347415988]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57074112859762,41.75160886523483]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0035/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"339.6,8142.9 332.8,112.4 5628.0,100.9 5628.0,8128.7 4330.2,8134.3 4330.4,7987.1 339.6,8142.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2340.0,4140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5662719,41.7535414]}},{"type":"Feature","properties":{"resourceCoords":[2340.0,8140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5662366,41.7517286]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p36","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0036/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"665.4,8102.0 658.1,168.1 5296.6,153.6 5295.4,8077.3 665.4,8102.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3324.0,4132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5626383,41.7535925]}},{"type":"Feature","properties":{"resourceCoords":[3324.0,8088.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5626052,41.7517784]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p37","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0037/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5246.2,198.0 5209.9,8125.9 401.9,8122.2 451.2,183.9 5246.2,198.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5228.0,4180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5584804,41.7536433]}},{"type":"Feature","properties":{"resourceCoords":[2824.0,8124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5599076,41.7518166]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0038/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"384.3,8126.9 434.7,0.0 835.1,0.0 891.3,172.5 4341.2,181.1 5628.0,1844.9 5628.0,2001.8 5282.2,1976.3 5389.8,2115.1 5252.5,2227.9 5214.1,8139.4 384.3,8126.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55878274531923,41.75553980973783]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55536627962091,41.755594727888074]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55525909803472,41.751831304783884]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55867556373305,41.751776386633644]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0039/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"453.6,8252.0 467.2,3054.9 733.6,3041.3 720.2,244.3 -0.0,252.4 -0.0,0.0 5628.0,-0.0 5628.0,118.3 4817.2,122.6 4813.9,2834.0 5222.7,2813.2 5204.7,8252.0 453.6,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56094875789837,41.76675055903443]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55904989055102,41.764622634250664]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56320358299789,41.762531283755266]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56510245034524,41.76465920853903]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0004/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,390.5 0.0,0.0 5131.5,82.6 5132.5,380.7 4795.0,381.0 4794.8,4178.2 5628.0,4178.7 5628.0,6181.6 4794.6,6178.1 4794.5,8159.1 5130.3,8252.0 155.5,8157.3 130.6,385.8 -0.0,390.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57822065559256,41.76623609803924]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57478311683361,41.76627433662601]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5747084757056,41.76248832883081]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57814601446455,41.762450090244045]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0040/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"413.5,2717.1 -0.0,2735.9 0.0,0.0 5628.0,-0.0 5628.0,2494.0 5187.8,2512.7 5203.7,8020.9 5628.0,8012.8 5628.0,8121.7 412.0,8124.0 413.5,2717.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[412.0,8124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5633026,41.7627079]}},{"type":"Feature","properties":{"resourceCoords":[5192.0,8124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.561696,41.7609278]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0041__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 | 1923 | sanborn01790_046 p41 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5628.0"},{"label":"split_canvas_h","value":"8252.0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0041__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0041/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5253.9,2653.8 5091.4,2657.6 5120.3,-0.0 3067.2,0.0 3045.6,1108.8 3038.0,1434.4 2946.8,1433.6 2083.6,1427.6 1936.8,1426.4 1960.4,0.0 0.0,-0.0 -0.0,254.4 950.9,272.5 903.8,2756.1 465.0,2766.5 376.7,8252.0 2826.8,8252.0 5176.1,8252.0 5253.9,2653.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0041__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3128.0,5540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5593444,41.7606357]}},{"type":"Feature","properties":{"resourceCoords":[420.0,5540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5602838,41.7616351]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0042/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5262.0,7948.1 4719.5,8093.7 1923.4,8252.0 142.0,8252.0 158.4,2752.9 -0.0,2759.4 0.0,0.0 4370.1,46.9 4587.5,2533.6 4805.4,2523.2 5262.0,7948.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55583079511192,41.761375730341086]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55387934665306,41.7592208670726]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5580852707258,41.757071425539785]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56003671918465,41.75922628880827]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0043/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0043/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5337.3,2591.8 5295.4,8204.0 205.8,8160.2 223.8,2571.4 -0.0,2562.6 -0.0,0.0 5628.0,-0.0 5628.0,2592.7 5337.3,2591.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0043/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55433942378436,41.75969028501429]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55220245746436,41.757723509335186]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5560411643969,41.755369664609184]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5581781307169,41.757336440288285]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p44","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0044/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"201.9,2642.7 486.0,2643.9 471.2,114.4 -0.0,113.8 -0.0,-0.0 4858.2,-0.0 4864.8,2688.5 5215.4,2692.0 5194.6,8032.6 2393.8,8226.1 192.8,8118.1 201.9,2642.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3000.0,8136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5550612,41.7544913]}},{"type":"Feature","properties":{"resourceCoords":[3000.0,5428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5537639,41.7552774]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0045/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5402.5,7649.0 4930.5,8252.0 313.7,8190.7 350.9,2747.9 -0.0,2746.1 0.0,-0.0 5628.0,-0.0 5628.0,2740.3 5359.2,2742.9 5402.5,7649.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55041581778,41.7562040714224]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54823946616993,41.75418704981485]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55217602467165,41.75178969032262]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55435237628173,41.75380671193017]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0046__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 | 1923 | sanborn01790_046 p46 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5628.0"},{"label":"split_canvas_h","value":"8252.0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0046__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0046/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4408.9,2704.6 4183.5,2732.4 5628.0,904.0 5628.0,-0.0 -0.0,-0.0 -0.0,175.8 414.3,178.4 416.0,2927.1 146.0,2928.0 122.1,7241.6 205.8,7965.8 333.6,8081.3 4111.7,3277.5 4408.9,2704.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0046__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[148.0,5708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5509747,41.7526819]}},{"type":"Feature","properties":{"resourceCoords":[144.0,2928.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5496519,41.7534865]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0047/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3116.7,8252.0 2606.0,7747.9 251.9,7761.6 252.7,8044.0 -0.0,8044.1 -0.0,258.3 4464.4,247.0 4465.1,3012.7 3813.4,3775.3 5628.0,5558.9 5628.0,6115.4 3824.5,8147.6 5628.0,8134.6 5628.0,8252.0 3116.7,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0047/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58568319922435,41.75161810238218]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58216918354675,41.7516506009832]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58210576131816,41.747779476623315]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58561977699576,41.7477469780223]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0048/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0048/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"701.4,2943.2 721.4,81.4 5439.8,97.1 5442.1,4100.2 4947.8,4098.3 4938.9,8238.5 4558.0,8252.0 4166.9,7862.0 2507.4,7822.9 2497.3,8252.0 -0.0,8252.0 1881.5,6162.6 1885.7,5586.7 21.3,3727.4 701.4,2943.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0048/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58333000476934,41.75155848118989]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5799345934065,41.75160836790246]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57983723749844,41.747867906026144]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58323264886127,41.74781801931357]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0049/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5185.3,119.8 5172.4,8139.1 -0.0,8252.0 -0.0,4114.2 493.9,4115.0 483.0,114.3 5185.3,119.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0049/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58033975772453,41.7516107523238]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57694217679735,41.7516551269189]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5768555779856,41.747912275893896]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58025315891278,41.7478679012988]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p5","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0005/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8156.1 -0.0,8155.1 -0.0,6154.8 835.6,6158.1 835.4,4135.7 -0.0,4135.5 -0.0,301.3 338.4,301.0 337.4,0.0 5053.1,0.0 5053.2,293.4 5628.0,292.0 5628.0,8156.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4440.0,8156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5725136,41.7625544]}},{"type":"Feature","properties":{"resourceCoords":[4440.0,6172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5725313,41.7634559]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0050/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.9,8156.2 267.1,135.5 4901.6,147.9 4856.3,8158.6 243.9,8156.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0050/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57737093934334,41.75165647328681]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5739740424573,41.75170413608125]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57388102652436,41.747962041329075]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5772779234104,41.74791437853463]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p51","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0051/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5409.2,8125.3 -0.0,8154.3 -0.0,170.9 5397.7,154.2 5409.2,8125.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3416.0,4156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5722957,41.7498375]}},{"type":"Feature","properties":{"resourceCoords":[3416.0,8136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5722643,41.7480263]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p52","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0052/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4702.9,8135.9 172.3,8157.4 165.3,148.2 4749.0,136.7 4702.9,8135.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2172.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5698674,41.7498656]}},{"type":"Feature","properties":{"resourceCoords":[2172.0,8148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5698347,41.7480594]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p53","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0053/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5477.7,0.0 5518.9,8180.8 -0.0,8237.2 -0.0,196.1 5477.7,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3488.0,4208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5662106,41.749908]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5674518,41.7517141]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p54","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0054/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"290.8,8195.3 282.7,202.0 4924.9,169.0 4965.3,8168.9 290.8,8195.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2276.0,8184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5637607,41.7481407]}},{"type":"Feature","properties":{"resourceCoords":[2276.0,188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5638179,41.7517613]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p55","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0055/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0055/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5345.5,219.3 5314.1,8201.0 -0.0,8203.9 -0.0,230.5 5345.5,219.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1328.0,4232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5613607,41.7499764]}},{"type":"Feature","properties":{"resourceCoords":[3324.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5601046,41.7481882]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p56","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0056/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0056/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4693.0,207.9 4696.0,8167.7 735.5,8184.2 738.2,230.3 4693.0,207.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2712.0,4216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5577172,41.7500249]}},{"type":"Feature","properties":{"resourceCoords":[2712.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5576851,41.7482196]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p57","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0057/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4696.8,262.5 4631.9,8205.2 678.2,8214.8 688.5,278.4 4696.8,262.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2668.0,4260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5552896,41.7500572]}},{"type":"Feature","properties":{"resourceCoords":[2668.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5552534,41.7482512]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0058/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4978.3,8193.1 790.5,8193.8 872.4,261.5 3086.3,258.1 3104.4,0.0 4335.4,0.0 4239.8,254.3 4889.7,255.1 4898.8,1288.4 5048.5,1950.3 5037.7,4245.9 3766.1,4246.4 3773.3,6168.5 4971.9,6215.1 4978.3,8193.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0058/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55461722498046,41.752011669972646]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55118797771344,41.75205586687984]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55110172515008,41.74827815413932]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5545309724171,41.748233957232124]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0059/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0059/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4998.5,8226.8 1200.4,8222.3 1201.3,6239.4 -0.0,6188.2 -0.0,4261.4 1274.7,4265.6 1294.1,1964.4 1146.6,1300.4 1141.2,264.5 5046.2,272.7 4998.5,8226.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0059/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5523321799219,41.75204317589347]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54891157758505,41.752096866137514]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54880679821827,41.74832867904455]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55222740055513,41.7482749888005]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p6","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0006/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,301.1 0.0,0.0 4502.4,0.0 4501.7,302.3 5340.0,304.0 5342.7,8141.1 572.3,8139.9 573.1,306.2 -0.0,301.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1356.0,8140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.571311,41.7625675]}},{"type":"Feature","properties":{"resourceCoords":[5340.0,304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5689472,41.7661657]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p60","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0060/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3007.7,0.0 5628.0,0.0 5628.0,8252.0 929.2,8218.9 934.2,280.7 3169.4,159.7 3007.7,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2888.0,4264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5480256,41.7501578]}},{"type":"Feature","properties":{"resourceCoords":[2888.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5479883,41.7483521]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0061/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0061/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"70.2,8230.5 0.0,-0.0 528.7,0.0 527.0,287.5 785.5,288.9 786.3,0.0 3194.2,0.0 3713.5,518.6 5628.0,529.7 5628.0,2385.7 4849.3,1659.2 4827.1,8219.8 70.2,8230.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0061/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58594623416111,41.747971977138846]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58251091100202,41.748018716402214]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58241970258638,41.744234074356]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58585502574547,41.74418733509263]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p62","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0062/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3256.0,8200.0 1233.9,8203.4 1248.4,1553.5 2032.8,2288.8 2030.6,407.5 3316.9,286.8 3251.8,3423.6 4081.5,4209.1 3241.8,4189.3 3256.0,8200.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3508.0,3664.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5815749,41.7463129]}},{"type":"Feature","properties":{"resourceCoords":[3256.0,8200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5816823,41.7442591]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0063/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"834.4,4245.5 -0.0,3493.4 -0.0,-0.0 1628.6,0.0 2021.2,373.5 2801.0,333.9 2879.3,234.0 5488.0,176.0 5628.0,8252.0 102.0,8169.6 5.8,4243.2 834.4,4245.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0063/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58172498938536,41.74803473165002]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57826344731063,41.748024364970206]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57828367718518,41.74421084195691]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58174521925991,41.74422120863672]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p64","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0064/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4729.0,108.0 4811.6,7960.2 1602.0,7916.0 1597.5,8252.0 806.8,8252.0 732.0,164.0 4729.0,108.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.0,164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.57835,41.7479433]}},{"type":"Feature","properties":{"resourceCoords":[4812.0,8140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5758484,41.744333]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p65","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0065/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"919.7,8014.0 902.9,207.1 4883.5,185.0 4888.6,8168.6 1331.7,8189.0 919.7,8014.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2900.0,8180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5746368,41.7443503]}},{"type":"Feature","properties":{"resourceCoords":[2900.0,196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5746987,41.7479931]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p66","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0066/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0066/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8148.8 879.1,8174.9 876.4,215.6 4849.9,194.4 4855.7,4183.0 5628.0,4179.5 5628.0,8148.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2868.0,4192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5722325,41.7462016]}},{"type":"Feature","properties":{"resourceCoords":[2868.0,8164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5722009,41.7443838]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p67","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0067/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8132.5 1175.4,8153.7 1178.3,4160.3 401.3,4163.3 398.4,150.4 5628.0,126.5 5628.0,8132.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4388.0,4148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5685828,41.7462493]}},{"type":"Feature","properties":{"resourceCoords":[2388.0,8148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5697688,41.7444173]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p68","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0068/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"557.5,208.1 5628.0,171.2 5628.0,8169.7 582.0,8209.3 557.5,208.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3304.0,4204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5661589,41.7462808]}},{"type":"Feature","properties":{"resourceCoords":[3304.0,8188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5661331,41.7444674]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p69","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0069/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"564.4,8195.0 573.7,253.2 5628.0,224.8 5628.0,8161.3 564.4,8195.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2212.0,8184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5637032,41.7445009]}},{"type":"Feature","properties":{"resourceCoords":[2212.0,244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5637607,41.7481407]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p7","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"24"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0007/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"854.2,8168.0 833.7,374.5 -0.0,374.7 -0.0,0.0 4890.4,0.0 5057.9,546.9 5628.0,1421.4 5628.0,2132.3 5180.8,1442.8 4800.0,1183.8 4812.5,8159.9 854.2,8168.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2828.0,4180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5676926,41.7644329]}},{"type":"Feature","properties":{"resourceCoords":[2828.0,8164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5676621,41.7626069]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p70","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0070/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"901.1,8227.1 946.7,262.1 5470.4,262.6 5433.6,8222.7 901.1,8227.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1476.0,4264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5612951,41.7463444]}},{"type":"Feature","properties":{"resourceCoords":[5452.0,4264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5588612,41.7463762]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p71","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0071/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4982.0,143.1 5082.8,8176.1 357.0,8238.3 296.0,200.0 4982.0,143.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4320.0,4192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5564416,41.7464078]}},{"type":"Feature","properties":{"resourceCoords":[296.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5588928,41.7482039]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p72","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0072/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5299.0,127.9 5267.0,8141.4 -0.0,8144.8 -0.0,125.5 5299.0,127.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3300.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5540044,41.7464396]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,8144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5551806,41.7446183]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p73","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"21"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0073/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"268.0,8196.0 268.0,200.0 5628.0,173.1 5628.0,8177.0 268.0,8196.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[268.0,8196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5527668,41.7446516]}},{"type":"Feature","properties":{"resourceCoords":[268.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5528342,41.7482826]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0074/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8151.5 923.8,8146.8 929.7,255.2 5628.0,282.5 5628.0,8151.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55014441929512,41.74843979797107]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54669459582843,41.748477899621996]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54662024261798,41.74467730804518]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55007006608467,41.74463920639426]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0075/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0075/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 289.5,0.0 288.1,171.3 5083.1,134.1 5108.3,4124.5 5628.0,4125.8 5628.0,6130.0 5105.5,6133.1 5117.2,8145.8 -0.0,8252.0 0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0075/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58598819204605,41.744274081663015]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58257992625698,41.74430633535952]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58251698906248,41.74055128443099]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58592525485155,41.74051903073449]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0076/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1408.9,4131.3 892.7,4123.1 921.7,159.4 4495.7,187.5 4418.4,8134.3 847.2,8121.1 862.8,6118.0 1381.8,6122.0 1408.9,4131.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58347320299163,41.744304121481576]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58004287776119,41.74437168467389]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57991104047186,41.740592331697684]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5833413657023,41.740524768505374]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p77","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0077/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0077/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"306.9,258.5 4304.8,394.0 4307.5,254.8 5093.6,263.6 4971.8,8252.0 314.5,8252.0 306.9,258.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2324.0,8168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5794216,41.7406504]}},{"type":"Feature","properties":{"resourceCoords":[2324.0,192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5794967,41.7442891]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0078/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0078/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,8169.8 0.0,-0.0 3429.6,0.0 5628.0,2068.7 5628.0,8027.2 -0.0,8169.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0078/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57780069447095,41.744428321695096]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57435654973621,41.74440405114653]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57440390937856,41.74060947883834]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5778480541133,41.7406337493869]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p79","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"1"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0079/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0079/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1476.2,2168.2 -0.0,713.3 -0.0,205.6 5034.4,159.0 5049.5,4176.0 4569.3,4713.1 4645.0,5290.2 5628.0,6258.7 5628.0,6467.5 4563.0,7514.9 4562.0,7965.2 4201.7,7963.6 3882.5,8184.1 1365.0,8176.8 1476.2,2168.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0079/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57528460915688,41.74443513336466]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57183829636435,41.74445877202369]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57179174483981,41.74069646805192]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57523805763235,41.74067282939289]}},{"type":"Feature","properties":{"resourceCoords":[1100.0,8176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5745649,41.7407121]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0008/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5316.2,8027.7 272.4,8157.3 207.0,1224.1 590.1,1478.6 1042.9,2160.6 1037.5,1454.1 5316.2,8027.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0008/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5666345997913,41.766381489227584]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56317917958445,41.7663942600422]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5631542511101,41.762588564599014]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56660967131695,41.7625757937844]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p80","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0080/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0080/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5258.3 -0.0,4756.9 480.0,4218.8 455.8,201.8 5033.0,149.2 5048.3,4130.9 5628.0,4124.5 5628.0,8252.0 1843.2,8252.0 1843.7,8012.9 -0.0,8009.0 -0.0,7558.7 1064.9,6509.0 1064.5,6300.3 -0.0,5258.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2464.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5709569,41.7425855]}},{"type":"Feature","properties":{"resourceCoords":[4484.0,8160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5697055,41.7407691]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p81","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0081/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0081/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"568.7,7947.7 583.2,4167.0 -0.0,4171.3 -0.0,165.9 5385.4,124.7 5376.2,7976.1 568.7,7947.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3388.0,8168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5672936,41.7408121]}},{"type":"Feature","properties":{"resourceCoords":[3388.0,140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5673463,41.7444507]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p82","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0082/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0082/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5037.1,8134.7 423.0,8162.5 438.2,193.9 5086.3,161.7 5037.1,8134.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2444.0,4160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5648782,41.7426679]}},{"type":"Feature","properties":{"resourceCoords":[2444.0,180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5649063,41.7444843]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0083/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0083/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5344.5,165.5 5389.8,8133.2 -0.0,8198.2 -0.0,234.4 5344.5,165.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56329102268401,41.7446137022804]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.559868532681,41.74462762414891]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5598413665606,41.740856920891964]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56326385656362,41.74084299902345]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p84","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0084/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0084/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8192.0 427.5,8185.5 489.6,214.7 5141.3,216.2 5140.2,4200.8 5628.0,4201.3 5628.0,8192.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2420.0,8188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.558767,41.7409266]}},{"type":"Feature","properties":{"resourceCoords":[4444.0,216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.55762,41.7445847]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p85","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0085/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0085/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"491.2,8118.9 490.1,4137.3 260.0,4137.0 -0.0,4136.8 -0.0,161.2 4389.5,162.8 4393.3,1794.1 5628.0,2745.2 5628.0,4142.2 5222.6,4141.9 5198.3,8124.6 491.2,8118.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0085/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55719502924286,41.7446644073883]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55376667477931,41.74471251584707]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55367279935314,41.740935354808016]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55710115381669,41.740887246349246]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0086/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0086/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"827.4,4175.9 1234.6,4177.2 1237.8,2774.2 -0.0,1816.1 -0.0,177.8 5117.3,199.2 5116.4,1838.0 5289.3,2822.5 4516.1,2811.9 4824.1,5040.9 4813.8,8189.8 793.8,8175.7 827.4,4175.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0086/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55452151946483,41.74470842635314]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5511080062657,41.744762261062085]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55100295696553,41.74100145400203]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55441647016467,41.74094761929309]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p87","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0087/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0087/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4795.7,8252.0 306.3,8252.0 301.8,4976.3 -0.0,2750.2 755.9,2757.0 578.3,1774.0 571.3,136.1 5628.0,130.9 5628.0,7663.0 4795.1,7663.7 4795.7,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0087/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55176327407435,41.7447244758547]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54834741375939,41.744765851470945]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54826667622311,41.74100246043393]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.55168253653807,41.74096108481769]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p88","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0088/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0088/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5440.0,8048.0 3819.2,7963.9 751.6,5596.1 748.0,92.7 5439.9,101.7 5440.0,8048.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0088/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5440.0,4072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5454332,41.7429195]}},{"type":"Feature","properties":{"resourceCoords":[5440.0,8048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5453958,41.7411014]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p89","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0089/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0089/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8229.6 1410.1,8229.4 1403.3,4246.1 -0.0,4245.3 -0.0,0.0 5628.0,0.0 5628.0,8229.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0089/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54635723535017,41.746661547726696]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54294329038258,41.74669682335321]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.54287445404161,41.74293564666411]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5462883990092,41.7429003710376]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p9","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"22"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0009/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,195.9 4676.0,219.5 4676.0,8130.0 623.8,8115.0 623.7,8252.0 -0.0,8252.0 -0.0,195.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4676.0,6140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5835065,41.7597091]}},{"type":"Feature","properties":{"resourceCoords":[4676.0,8128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5834834,41.7587929]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p90","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0090/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0090/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4812.0,8124.0 844.7,8145.6 835.0,161.3 4791.3,166.9 4812.0,8124.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4812.0,8124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5429274,41.7393122]}},{"type":"Feature","properties":{"resourceCoords":[2812.0,164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5442238,41.7429318]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p91","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0091/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0091/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,291.8 5628.0,8252.0 -0.0,8252.0 -0.0,296.7 5628.0,291.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0091/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58584282627751,41.740656184648124]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58240213405772,41.74073629492627]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5822458222832,41.73694530497936]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.585686514503,41.73686519470121]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p92","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0092/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0092/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1921.5,8170.6 1770.6,227.6 4632.3,197.7 4668.6,8252.0 1921.5,8170.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0092/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58347896841283,41.740696909756686]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58004394294875,41.74072784036766]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57998359089588,41.73694309493573]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.58341861635996,41.73691216432476]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p93","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0093/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0093/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,179.1 5628.0,8252.0 375.0,8252.0 376.0,265.1 5628.0,179.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4364.0,4180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5781741,41.7388436]}},{"type":"Feature","properties":{"resourceCoords":[2348.0,8180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5793652,41.7370053]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p94","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0094/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0094/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"597.1,138.7 5356.3,191.2 5229.6,8181.8 509.4,8237.4 597.1,138.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0094/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.5778055505748,41.74073220385994]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57440382523556,41.74080234712656]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57426696097738,41.73705429652378]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57766868631661,41.73698415325716]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p95","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0095/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0095/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"325.3,8252.0 271.9,227.7 3083.4,223.7 3405.0,0.0 5628.0,0.0 5628.0,8252.0 325.3,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[292.0,4240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5745409,41.7388977]}},{"type":"Feature","properties":{"resourceCoords":[4312.0,8208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5720917,41.7371112]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p96","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0096/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0096/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"784.5,335.8 4191.7,369.0 4106.9,7559.9 4692.5,8148.0 692.5,8148.3 784.5,335.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0096/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57180301145901,41.74086648245656]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56835376995797,41.74090967105549]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56826949974167,41.73710927489352]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.57171874124272,41.73706608629459]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p97","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0097/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0097/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,371.1 370.9,370.4 370.1,0.0 5201.2,0.0 5264.0,7621.6 5628.0,7965.0 5628.0,8159.5 600.8,8252.0 -0.0,7662.7 -0.0,371.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0097/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56923137265301,41.740897307993414]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56582909601185,41.74090976168059]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56580479618613,41.73716111354133]}},{"type":"Feature","properties":{"resourceCoords":[0.0,8252.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.56920707282728,41.73714865985416]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p98","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0098/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0098/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"785.6,8122.1 232.8,7577.1 309.3,144.6 5628.0,175.5 5628.0,8252.0 -0.0,8252.0 -0.0,8115.3 785.6,8122.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2288.0,4132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5648222,41.7390367]}},{"type":"Feature","properties":{"resourceCoords":[4316.0,168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5636417,41.7408626]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1923 | sanborn01790_046 p99","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T11:02:34Z","modified":"2026-09-21T11:02:34Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0099/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0099/info.json","type":"ImageService2","height":8252,"width":5628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5628.0,8252.0 786.1,8252.0 681.6,187.0 5353.1,153.6 5357.9,8137.2 5628.0,8252.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790192327:01790_27_1923-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3348.0,8152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.561161,41.737255]}},{"type":"Feature","properties":{"resourceCoords":[3348.0,168.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.5612119,41.7408945]}}]}}]}