{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_017.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1906 | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"96"},{"label":"placed","value":"88"},{"label":"unplaced","value":"8"},{"label":"fit sources","value":"georef 59, georef-snap 25, snap:0 3, snap:1 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"2 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p62 (tier 1, 41.87644,-87.63508 +/-236m); p79__1 (tier 1, 41.86934,-87.63298 +/-101m); p79__2 (tier 1, 41.87111,-87.63380 +/-186m); p9 (tier 1, 41.87461,-87.62920 +/-114m); p91 (tier 1, 41.88728,-87.62241 +/-249m); p92 (tier 1, 41.88635,-87.62156 +/-116m); p93 (tier 2, 41.88442,-87.61616 +/-100m); p94__2 (tier 1, 41.88475,-87.61633 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p1","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0001","type":"ImageService3","width":1468,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"103.6,674.1 241.4,398.6 274.6,99.5 507.2,57.1 775.5,164.9 1015.2,152.6 1076.5,25.9 1128.8,14.3 1151.0,15.0 1151.4,9.3 1163.5,6.7 1164.0,15.0 1233.0,15.0 1233.3,9.8 1234.8,12.0 1235.0,15.0 1236.7,15.0 1280.6,81.8 1290.8,124.0 1289.6,227.0 1211.9,282.3 884.9,552.6 756.7,663.2 721.1,769.2 669.9,769.0 652.9,894.6 626.0,1236.7 617.6,1473.8 383.5,1470.0 137.6,1471.1 103.6,674.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1292.0,775.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354195,41.8857333]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,1479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354008,41.8844649]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p10","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0010","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.3,1180.5 142.1,1259.7 14.6,1309.5 14.4,1297.7 14.4,1291.7 112.9,1255.2 190.0,1210.3 260.2,1158.7 251.5,1131.9 202.6,1059.1 198.6,1024.5 277.8,792.3 320.9,921.1 509.1,924.2 654.2,806.0 793.3,597.3 882.2,229.6 1099.6,199.0 1049.0,461.6 1036.3,510.9 1076.9,525.2 1055.9,718.3 1054.6,888.5 1056.6,1338.0 1020.1,1337.5 998.7,1352.2 715.5,1347.1 717.8,1332.9 300.4,1325.4 267.3,1180.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62709380534257,41.88920398018547]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6235707846647,41.889247049587496]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6234984868925,41.88596866002411]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62702150757038,41.88592559062209]}},{"type":"Feature","properties":{"resourceCoords":[1073.0,1354.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62446,41.8868112]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p11","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0011","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"373.0,908.0 364.8,605.7 779.8,610.0 777.5,624.1 1059.1,627.0 1060.7,1206.4 373.0,1205.0 373.0,908.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[373.0,908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262927,41.8862954]}},{"type":"Feature","properties":{"resourceCoords":[373.0,1205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262864,41.8857605]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p12","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0012","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"377.0,917.0 377.0,563.0 1069.7,562.6 1076.4,815.2 1085.9,1034.0 1086.9,1278.2 756.4,1273.0 382.6,1272.0 377.0,917.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[377.0,917.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262812,41.8851275]}},{"type":"Feature","properties":{"resourceCoords":[377.0,563.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262864,41.8857605]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p13","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0013","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.9,708.6 414.0,556.0 680.7,559.1 1022.2,559.9 1029.4,1263.5 816.5,1263.0 721.5,1262.9 483.6,1260.7 415.9,1260.1 412.9,708.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[414.0,908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354125,41.8850992]}},{"type":"Feature","properties":{"resourceCoords":[414.0,556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354195,41.8857333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0014","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"442.0,1276.6 425.4,552.1 1015.2,546.0 1027.8,909.3 1033.4,1270.6 442.0,1276.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1060.0,1268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63246429131598,41.884478166657054]}},{"type":"Feature","properties":{"resourceCoords":[1060.0,566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6324569177096,41.885706030874594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0015","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1013.1,545.5 1019.8,1066.3 1021.5,1204.0 1023.5,1262.5 414.2,1261.4 361.8,1261.2 359.6,904.3 350.6,545.2 424.4,545.1 1013.1,545.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[383.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63248064288192,41.885095821067964]}},{"type":"Feature","properties":{"resourceCoords":[1019.0,559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63097213690465,41.885723090487645]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p16","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0016","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1030.2,796.5 1028.0,1252.0 419.1,1242.3 418.0,1185.2 420.1,542.8 739.7,549.8 798.7,550.5 1028.0,553.0 1030.2,796.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1028.0,1252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6294681,41.8844831]}},{"type":"Feature","properties":{"resourceCoords":[1028.0,553.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6295039,41.8857516]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p17","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0017","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"404.0,1261.0 401.1,799.3 396.2,552.6 1048.0,557.0 1048.6,613.0 1049.2,672.9 1054.5,1227.0 1054.9,1264.2 971.8,1264.0 628.2,1261.8 404.0,1261.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[404.0,1261.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6294681,41.8844831]}},{"type":"Feature","properties":{"resourceCoords":[1048.0,557.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.627936,41.8857554]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0018","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"376.1,1272.2 370.4,608.2 369.9,551.1 1069.0,556.0 1067.2,916.4 1071.1,1277.7 376.1,1272.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[373.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6279192,41.8851251]}},{"type":"Feature","properties":{"resourceCoords":[1069.0,556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262864,41.8857605]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0019","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1027.1,544.6 1027.7,594.5 1028.4,653.5 1028.8,689.4 1032.3,896.9 1032.9,973.9 1034.0,1047.6 1035.6,1196.1 1036.4,1236.2 430.6,1244.5 428.2,900.0 421.4,547.8 1027.1,544.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1034.0,1224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63538169844055,41.88326097141512]}},{"type":"Feature","properties":{"resourceCoords":[1034.0,550.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63538437860385,41.88445545739882]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p2","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0002","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"378.5,1231.0 406.1,892.0 423.3,767.5 474.0,767.9 509.6,662.9 636.9,553.6 961.9,286.5 1039.0,231.9 1037.0,488.5 1039.9,775.1 1038.0,926.4 1038.0,1473.0 447.5,1469.0 369.6,1466.0 378.5,1231.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1038.0,1124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354125,41.8850992]}},{"type":"Feature","properties":{"resourceCoords":[1038.0,1473.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354008,41.8844649]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p20","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0020","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1077.7,603.1 1081.0,940.7 1081.2,982.9 1081.0,1035.2 1082.0,1230.5 1083.2,1269.1 721.9,1264.6 502.4,1262.6 432.0,1262.0 431.7,989.8 431.0,694.7 431.0,544.5 753.2,549.2 1077.8,551.5 1077.7,603.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[432.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.635387,41.8838406]}},{"type":"Feature","properties":{"resourceCoords":[432.0,1262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.635376,41.8832393]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p21","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0021","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"427.9,1198.8 433.0,587.8 433.9,537.5 1023.5,551.2 1076.5,552.8 1074.0,1217.1 1050.0,1254.0 428.5,1236.5 427.9,1198.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1050.0,1254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6324167,41.883243]}},{"type":"Feature","properties":{"resourceCoords":[1050.0,552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6324644,41.8844738]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p22","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0022","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"422.1,772.7 445.3,737.1 448.5,95.8 1042.2,111.7 1038.3,391.8 1037.8,450.0 1036.9,522.7 1030.8,600.1 1029.0,750.8 1029.3,788.7 1032.5,1484.5 975.5,1483.9 772.8,1482.2 472.9,1480.2 423.0,1483.0 422.1,772.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[423.0,1483.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6323622,41.881953]}},{"type":"Feature","properties":{"resourceCoords":[423.0,95.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6324644,41.8844738]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p23","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0023","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1041.0,551.0 1046.5,822.2 1059.3,1259.5 1022.2,1259.0 850.5,1256.3 487.4,1255.2 424.0,1255.0 418.9,1060.5 422.4,980.5 413.5,556.6 1041.0,551.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[424.0,1255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6309343,41.8832472]}},{"type":"Feature","properties":{"resourceCoords":[1041.0,551.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6294681,41.8844831]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p24","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0024","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"409.4,828.3 411.0,562.0 634.8,565.5 976.6,572.0 1019.8,1264.5 624.5,1260.0 410.6,1257.8 409.4,828.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1060.0,1265.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6278661,41.8832481]}},{"type":"Feature","properties":{"resourceCoords":[411.0,562.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6294681,41.8844831]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p25","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0025","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"406.4,1553.3 402.7,927.5 361.9,927.3 314.8,224.0 400.0,225.0 1091.0,235.2 1094.7,1424.2 1096.2,1601.8 485.1,1601.8 414.6,1608.7 406.4,1553.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1093.0,937.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.626228,41.8832533]}},{"type":"Feature","properties":{"resourceCoords":[400.0,225.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6279024,41.884489]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p26","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0026","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1263.5,355.6 1265.5,693.4 1377.7,717.7 1317.6,724.2 1310.6,1159.4 1249.8,1203.5 1287.5,1661.9 1175.1,1809.0 1156.0,1809.0 1151.2,1809.3 1151.0,1809.0 1089.0,1810.0 1087.5,1568.4 741.0,1576.0 389.6,1577.0 387.8,1402.5 382.0,234.0 753.9,238.7 1082.5,247.2 1175.5,317.5 1284.0,318.9 1263.5,355.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[741.0,1576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6253439,41.8820911]}},{"type":"Feature","properties":{"resourceCoords":[382.0,234.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6262626,41.8844929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0027","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"967.0,1540.8 931.8,1549.7 313.9,1568.0 271.2,1311.6 322.4,671.5 238.5,483.5 367.3,468.1 457.4,166.7 455.0,124.4 704.1,119.8 941.2,120.4 1020.9,122.1 1029.2,470.4 1033.2,811.1 1015.8,811.5 1034.1,1541.2 967.0,1540.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63928139393185,41.88468165140008]}},{"type":"Feature","properties":{"resourceCoords":[1474.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63575884758488,41.8846738530444]}},{"type":"Feature","properties":{"resourceCoords":[1474.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63577176784253,41.88139312445958]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6392943141895,41.88140092281526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0028","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"399.2,548.0 416.3,547.6 1009.8,535.0 1027.6,1262.2 419.2,1270.7 399.2,548.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1032.0,549.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353220609376,41.88321380073713]}},{"type":"Feature","properties":{"resourceCoords":[1032.0,1260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353321245019,41.88192767393723]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p29","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0029","type":"ImageService3","width":1474,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"420.0,559.0 1015.8,567.2 1017.9,1264.4 748.6,1262.6 421.6,1263.7 420.0,559.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[420.0,913.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353614,41.8825784]}},{"type":"Feature","properties":{"resourceCoords":[420.0,559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.635376,41.8832393]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p3","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0003","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"413.5,591.0 402.9,548.7 358.4,481.9 356.5,481.8 354.5,481.8 285.1,482.4 314.8,467.0 423.3,442.0 423.9,238.6 717.7,216.9 733.0,134.1 1005.1,134.9 1024.9,569.4 1020.5,569.4 1032.0,1246.7 688.4,1247.8 420.0,1246.0 413.9,955.1 413.2,694.6 413.5,591.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63643852669256,41.88796231386957]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63291504662234,41.887970089516216]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63290199415577,41.88469127245973]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63642547422599,41.88468349681309]}},{"type":"Feature","properties":{"resourceCoords":[420.0,1246.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6354195,41.8857333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p30","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0030","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"465.1,540.9 1053.0,559.0 1053.0,1255.0 1004.8,1257.0 456.7,1242.9 465.1,540.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1053.0,1255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6323622,41.881953]}},{"type":"Feature","properties":{"resourceCoords":[1053.0,559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6324167,41.883243]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0031","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1016.7,1249.1 990.6,1248.7 871.4,1248.2 720.4,1239.5 500.3,1237.5 446.8,1238.1 437.2,541.4 851.1,552.9 1053.6,561.1 1055.0,620.9 1052.0,1098.7 1052.7,1249.2 1016.7,1249.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[441.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63090616837746,41.88257875716942]}},{"type":"Feature","properties":{"resourceCoords":[1063.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62939069708479,41.88260233859475]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p32","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0032","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"426.1,1104.9 420.6,627.2 418.1,567.5 696.5,564.9 1060.2,561.9 1073.0,1171.0 1081.8,1224.7 1012.5,1231.8 874.6,1246.3 824.6,1248.2 766.8,1249.8 429.6,1255.3 426.1,1104.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1067.0,923.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6278471,41.8825929]}},{"type":"Feature","properties":{"resourceCoords":[424.0,923.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6294144,41.8825897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p33","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0033","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"338.8,1273.6 342.4,555.0 342.5,531.0 411.2,533.0 1046.0,541.0 1046.0,1276.0 338.8,1273.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1046.0,541.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353428,41.8819237]}},{"type":"Feature","properties":{"resourceCoords":[1046.0,1276.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353074,41.8806496]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p34","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0034","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"428.0,1275.0 428.0,551.0 774.9,551.3 1060.5,554.4 1060.0,1276.5 428.0,1275.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[428.0,1275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353074,41.8806496]}},{"type":"Feature","properties":{"resourceCoords":[428.0,551.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353428,41.8819237]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p35","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0035","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"406.1,1261.3 405.0,538.5 983.1,545.9 1034.0,543.0 1034.0,619.3 1034.0,654.1 1034.0,1078.9 1034.0,1220.3 1034.0,1264.0 406.1,1261.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1034.0,1264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.632331,41.8806855]}},{"type":"Feature","properties":{"resourceCoords":[1034.0,543.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6323622,41.881953]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0036","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"994.1,1262.4 892.7,1263.3 480.5,1263.9 425.6,1264.0 424.4,1080.0 420.9,547.3 472.0,543.5 1046.9,537.2 1054.1,1055.0 1054.1,1262.5 994.1,1262.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[433.0,920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63232294359221,41.88129404882787]}},{"type":"Feature","properties":{"resourceCoords":[1041.0,1263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63086906771203,41.88069999284358]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p37","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0037","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"681.8,542.8 835.4,550.0 1019.6,549.0 1029.0,1263.0 989.3,1263.6 463.1,1262.0 412.0,1263.0 411.6,1057.4 403.7,544.4 681.8,542.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[412.0,1263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.630838,41.8807012]}},{"type":"Feature","properties":{"resourceCoords":[1029.0,1263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6293588,41.8807123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p38","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0038","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"754.2,552.4 865.0,551.1 1078.0,533.3 1085.6,582.0 1081.8,1263.5 1016.1,1272.2 880.8,1272.4 655.0,1270.5 408.0,1272.0 408.0,551.0 754.2,552.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[408.0,551.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6293986,41.8819867]}},{"type":"Feature","properties":{"resourceCoords":[408.0,1272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6293588,41.8807123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p39","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0039","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"455.1,1615.5 388.6,1623.9 386.5,908.2 386.9,231.8 379.1,183.5 448.9,176.8 1055.0,177.0 1055.0,1609.0 455.1,1615.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1055.0,1609.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261297,41.8795286]}},{"type":"Feature","properties":{"resourceCoords":[1055.0,177.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261923,41.8820791]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0004","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"398.9,564.2 403.2,564.3 390.2,130.3 404.4,130.6 458.2,63.9 699.5,30.7 1015.4,32.6 1013.4,576.2 1006.8,591.8 1019.6,592.0 1041.6,648.1 1042.1,1057.2 1047.6,1248.3 974.9,1247.5 399.9,1240.3 398.9,564.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1028.0,951.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63244707434592,41.886275045954584]}},{"type":"Feature","properties":{"resourceCoords":[1028.0,1254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63243363533941,41.88573154590359]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0040","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"396.0,1624.0 396.0,193.0 750.4,192.8 1099.9,185.8 1100.8,429.5 1187.7,428.7 1169.6,452.2 1119.8,693.5 1118.9,1155.2 1269.2,1211.0 1266.0,1385.0 1144.2,1428.2 1147.3,1621.0 396.0,1624.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[396.0,1624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261297,41.8795286]}},{"type":"Feature","properties":{"resourceCoords":[396.0,193.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261923,41.8820791]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.31"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0041","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1012.7,211.8 1048.0,227.6 1031.7,925.6 1019.9,1637.7 335.6,1623.5 254.4,1476.4 251.9,1151.0 148.4,1071.3 183.4,762.5 134.3,654.7 229.1,567.6 238.0,341.0 394.9,226.2 392.1,203.9 1012.7,211.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63949390193225,41.882206700318235]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63598364197058,41.88230993508105]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63581284188636,41.87904495047533]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63932310184803,41.87894171571252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0042","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"479.4,1582.8 387.7,1549.8 309.5,1437.5 358.8,762.5 211.7,636.3 286.6,559.3 282.3,309.4 230.7,227.2 916.0,202.6 980.5,200.8 997.8,217.6 1022.1,912.5 1002.5,913.6 1028.8,1508.0 1038.7,1629.8 1463.1,1615.4 1462.7,1621.5 1457.0,1632.0 1457.0,1648.0 1461.2,1648.7 1461.2,1649.3 1457.0,1650.0 1454.8,1763.6 479.4,1582.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63908281901044,41.87974678201491]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63557706541634,41.87970125846637]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63565238032582,41.876440335714534]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63915813391992,41.87648585926308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p43","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0043","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"403.5,1065.5 339.7,1064.9 337.6,353.4 1024.0,355.0 1024.0,1415.5 1024.0,1427.8 439.4,1440.4 439.4,1082.9 420.1,1082.8 403.5,1065.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1024.0,1072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352736,41.879369]}},{"type":"Feature","properties":{"resourceCoords":[1024.0,355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353074,41.8806496]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p44","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0044","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"411.0,1410.0 411.0,354.0 1031.1,354.8 1030.1,1068.7 1030.3,1436.7 411.0,1436.0 411.0,1410.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[411.0,1068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352736,41.879369]}},{"type":"Feature","properties":{"resourceCoords":[411.0,354.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6353074,41.8806496]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p45","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0045","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"398.2,1259.9 400.2,539.7 1021.0,544.0 1021.4,1263.8 398.2,1259.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1021.0,904.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6323129,41.8800455]}},{"type":"Feature","properties":{"resourceCoords":[1021.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.632331,41.8806855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p46","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0046","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"424.3,556.9 888.6,559.7 1049.0,560.0 1051.0,1116.5 1049.0,1275.0 426.1,1276.0 424.3,556.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1049.0,560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.630838,41.8807012]}},{"type":"Feature","properties":{"resourceCoords":[1049.0,1275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6308053,41.879429]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p47","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0047","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"413.8,1441.8 416.6,1011.2 418.0,854.1 413.8,302.2 1027.5,305.3 1030.0,1012.0 1032.7,1288.6 1034.0,1448.1 1034.4,1717.0 834.2,1716.8 416.3,1718.7 413.8,1441.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1030.0,1012.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.629327,41.8794443]}},{"type":"Feature","properties":{"resourceCoords":[416.0,658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6308196,41.8800628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p48","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0048","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1074.8,1394.8 403.6,1413.0 402.1,1308.1 397.7,1027.9 391.0,312.0 637.5,307.2 997.9,303.8 1063.3,294.2 1072.0,1013.8 1074.7,1379.8 1074.8,1394.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[394.0,668.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6293439,41.8800818]}},{"type":"Feature","properties":{"resourceCoords":[1068.0,668.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6277403,41.8800929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p49","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0049","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"452.0,44.1 451.4,400.8 1034.6,389.2 1034.6,402.9 1033.0,831.1 1034.0,1452.0 1433.2,1451.2 1465.0,1451.4 1463.7,1571.7 1035.1,1672.0 1035.1,1646.0 845.2,1602.9 824.4,1598.2 838.2,1451.2 418.8,1449.2 413.8,1327.8 410.6,736.0 430.0,735.6 432.7,44.0 452.0,44.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1034.0,739.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352402,41.8781073]}},{"type":"Feature","properties":{"resourceCoords":[1034.0,1452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352035,41.8768308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p5","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0005","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"447.6,1251.7 441.3,1059.5 439.5,648.1 417.2,591.7 410.9,575.9 411.1,29.1 706.0,29.9 1022.1,125.5 1028.1,124.4 1028.6,530.1 1031.6,656.3 1032.0,1258.0 447.6,1251.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1032.0,955.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6309972,41.8862874]}},{"type":"Feature","properties":{"resourceCoords":[1032.0,1258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6309862,41.885747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p50","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0050","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1050.2,391.8 1051.5,1308.3 1053.3,1439.7 1000.9,1439.1 830.3,1438.3 431.2,1439.9 429.1,819.1 430.0,391.0 1050.2,391.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[430.0,727.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352402,41.8781073]}},{"type":"Feature","properties":{"resourceCoords":[430.0,391.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352561,41.878709]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0051","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"442.7,1639.5 439.1,1507.4 425.3,585.1 420.1,214.3 1042.8,208.8 1049.3,562.5 1051.5,917.7 995.7,918.4 842.2,920.4 849.0,1414.5 849.4,1447.2 851.4,1594.2 852.0,1636.5 442.7,1639.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1033.0,210.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63231711520314,41.87940379928876]}},{"type":"Feature","properties":{"resourceCoords":[1033.0,925.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63230663685827,41.878131253167396]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p52","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0052","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"424.4,1262.2 424.0,908.0 419.4,555.3 1040.4,549.5 1039.2,982.3 1042.8,1260.7 424.4,1262.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[424.0,908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6322731,41.8787766]}},{"type":"Feature","properties":{"resourceCoords":[768.0,908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6314485,41.8787836]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0053","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1153.9,1274.6 1032.4,1274.4 726.1,1272.6 422.7,1270.8 409.9,1270.8 328.8,1270.3 329.6,559.2 537.5,559.5 1153.2,563.9 1153.9,1274.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[701.0,1269.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63183315457232,41.8768792317605]}},{"type":"Feature","properties":{"resourceCoords":[1138.0,560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6308170043671,41.87816609447544]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p54","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0054","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"939.9,561.0 938.4,929.0 938.2,985.4 937.1,1270.5 910.0,1270.4 523.0,1268.0 523.0,560.0 939.9,561.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[523.0,560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6307802,41.8781597]}},{"type":"Feature","properties":{"resourceCoords":[523.0,1268.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6307428,41.8768861]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p55","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0055","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"537.2,689.7 740.9,691.0 961.3,690.5 959.0,1415.0 535.1,1414.0 537.2,689.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[740.0,1415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6292574,41.8769036]}},{"type":"Feature","properties":{"resourceCoords":[959.0,1415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6287391,41.8769116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p56","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0056","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"295.1,424.8 295.0,368.2 966.6,357.6 965.9,563.2 965.0,693.5 963.1,1412.6 798.3,1419.8 511.0,1418.0 513.3,696.9 293.9,697.4 295.1,424.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[511.0,1418.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6287391,41.8769116]}},{"type":"Feature","properties":{"resourceCoords":[293.0,1418.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6292574,41.8769036]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p57","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0057","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"481.2,570.5 1080.0,564.0 1080.0,1274.0 729.2,1277.3 480.3,1284.1 413.5,1290.4 414.0,1161.1 414.2,942.2 414.8,578.9 481.2,570.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,1274.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260987,41.8782617]}},{"type":"Feature","properties":{"resourceCoords":[1080.0,564.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261297,41.8795286]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p58","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0058","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"394.0,564.0 1140.3,561.0 1152.0,1266.4 1041.4,1263.6 394.0,1270.0 394.0,564.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[394.0,1270.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260987,41.8782617]}},{"type":"Feature","properties":{"resourceCoords":[394.0,564.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6261297,41.8795286]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p59","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0059","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"406.1,585.8 472.0,579.6 717.3,573.1 1063.0,570.0 1063.0,1279.0 1001.7,1282.8 628.4,1278.3 467.1,1281.4 405.6,1288.8 406.1,585.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1063.0,1279.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260662,41.8769779]}},{"type":"Feature","properties":{"resourceCoords":[1063.0,570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260987,41.8782617]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p6","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0006","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"747.5,63.5 972.0,110.7 1026.9,185.4 1031.0,1254.0 740.1,1253.9 417.6,1250.5 414.1,653.8 410.4,528.8 407.9,126.5 747.5,63.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[416.0,950.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6309972,41.8862874]}},{"type":"Feature","properties":{"resourceCoords":[1031.0,1254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6295039,41.8857516]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p60","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0060","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"384.0,558.0 1022.0,552.1 1130.9,554.9 1133.8,738.1 1069.5,1258.2 1017.2,1255.5 443.8,1259.8 384.0,1263.0 384.0,558.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[384.0,1263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260662,41.8769779]}},{"type":"Feature","properties":{"resourceCoords":[384.0,558.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260987,41.8782617]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p61","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0061","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"518.5,1664.1 329.8,1629.2 278.0,1110.7 213.2,1069.5 258.6,930.3 71.1,433.8 136.2,213.5 15.1,158.8 15.1,154.1 15.1,151.6 1120.0,446.0 1118.9,474.8 1131.5,531.9 1134.4,545.1 1134.0,627.2 1134.7,801.4 1121.6,1422.2 1126.0,1568.0 1075.6,1564.2 520.9,1593.1 518.5,1664.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1126.0,1568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.635017,41.8744579]}},{"type":"Feature","properties":{"resourceCoords":[1126.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6352035,41.8768308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.65"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0063","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"897.0,1584.0 436.5,1572.9 429.7,1423.0 433.5,784.5 430.1,605.3 429.9,589.5 429.2,520.9 412.1,448.8 412.2,445.6 850.6,353.1 854.7,230.6 865.9,230.9 995.9,234.6 1049.3,236.4 1047.0,284.1 1043.2,415.5 1042.8,430.8 1039.9,539.1 1039.7,547.7 1039.5,557.0 1030.0,908.8 1027.8,1095.8 1014.0,1512.0 1008.7,1586.4 897.0,1584.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1038.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6335977561241,41.8745086970608]}},{"type":"Feature","properties":{"resourceCoords":[427.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.63503974224842,41.87446221498748]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p64","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0064","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"938.4,1557.7 508.0,1570.0 508.9,1496.7 498.4,1087.9 489.8,904.3 478.8,558.8 478.2,541.3 474.8,434.9 470.5,290.8 470.0,243.9 876.6,232.1 903.0,231.3 913.3,895.4 788.8,898.6 739.8,899.9 747.7,985.5 925.0,982.2 942.7,1557.5 938.4,1557.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63482838787885,41.877302820933444]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6312788630367,41.87726182749688]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63134716318832,41.873983390413535]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63489668803048,41.8740243838501]}},{"type":"Feature","properties":{"resourceCoords":[508.0,1570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6336653,41.8744776]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p65","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0065","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"313.3,1573.3 318.4,1001.7 142.4,998.0 137.9,912.7 186.6,913.4 310.2,915.0 326.3,255.7 507.2,257.2 892.9,260.9 1120.3,262.5 1117.1,874.1 1111.0,1360.3 1112.0,1576.0 889.8,1575.1 820.2,1574.9 722.3,1574.5 687.8,1574.3 344.1,1573.5 313.3,1573.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[695.0,259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6317726,41.8768737]}},{"type":"Feature","properties":{"resourceCoords":[1112.0,1576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6306857,41.874518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p66","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0066","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"795.7,1573.3 723.9,1573.2 714.8,1573.2 670.5,1573.6 553.1,1573.9 500.0,1574.0 497.6,1357.9 500.7,870.9 500.0,258.0 914.0,258.9 914.0,921.5 1115.6,927.2 1115.2,1014.0 913.5,1017.2 921.1,1573.1 795.7,1573.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6307428,41.8768861]}},{"type":"Feature","properties":{"resourceCoords":[500.0,1574.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6306857,41.874518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0067","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"939.8,262.2 939.9,885.5 943.2,1526.2 938.1,1586.9 528.4,1587.1 520.8,1026.8 724.1,1023.5 724.5,936.1 521.2,930.3 521.4,262.3 939.8,262.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[717.0,1580.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62921612700539,41.874552052447854]}},{"type":"Feature","properties":{"resourceCoords":[942.0,1580.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62867672446816,41.874559317823135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p68","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0068","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"514.0,1510.0 510.0,865.0 509.4,237.7 796.2,238.4 960.6,230.7 942.8,278.2 942.9,471.7 965.8,552.7 961.9,871.6 965.0,1571.0 749.8,1568.4 509.0,1571.0 514.0,1510.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[965.0,1571.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6275996,41.8745607]}},{"type":"Feature","properties":{"resourceCoords":[509.0,1571.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6286857,41.8745469]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p69","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0069","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"396.9,838.4 401.0,522.5 378.4,442.3 378.4,250.7 396.1,203.6 458.4,196.0 621.5,192.7 999.0,196.9 1061.0,193.0 1058.3,318.4 1061.0,910.0 1067.8,1625.3 575.1,1629.0 400.8,1628.5 399.4,1531.2 396.9,838.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1061.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260353,41.8756941]}},{"type":"Feature","properties":{"resourceCoords":[1061.0,193.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260662,41.8769779]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0007","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.6,108.0 701.8,30.5 1040.4,66.7 1138.2,263.2 1446.0,240.7 1446.0,298.0 1451.0,319.0 1449.0,400.0 1449.9,400.9 1449.0,465.6 1357.1,477.2 1107.9,485.2 1111.9,576.7 1039.5,578.8 1065.7,1105.5 1110.1,1162.3 446.9,1183.9 399.9,92.1 412.6,108.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1072.0,882.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62800670726291,41.8862503397971]}},{"type":"Feature","properties":{"resourceCoords":[429.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62954620851997,41.88575230927379]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p70","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0070","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1072.5,1622.7 726.6,1626.2 387.0,1625.0 387.0,915.0 389.9,327.8 393.8,203.4 454.2,200.7 1033.0,201.4 1085.7,204.4 1070.2,320.9 1096.9,441.4 1266.7,520.8 1270.3,663.0 1125.8,748.8 1108.6,830.6 1087.8,1316.2 1233.4,1462.2 1227.2,1686.5 1071.8,1689.3 1072.5,1622.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[387.0,915.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6260353,41.8756941]}},{"type":"Feature","properties":{"resourceCoords":[387.0,1625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6259881,41.8744135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p71","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0071","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"569.5,246.3 620.3,248.5 1180.0,252.0 1177.3,317.4 1179.2,725.3 1180.8,1512.4 1179.0,1585.8 601.3,1534.2 300.2,1571.5 197.2,1493.8 61.1,372.3 12.7,365.0 12.8,293.5 569.5,246.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1180.0,252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6336653,41.8744776]}},{"type":"Feature","properties":{"resourceCoords":[1180.0,1546.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6335845,41.8721511]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p72","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0072","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"382.1,1535.3 382.1,1337.5 377.3,337.6 380.0,272.0 809.7,277.1 845.0,277.3 1190.3,278.3 1190.2,318.9 1190.0,350.9 1189.6,425.6 1188.0,1564.0 1152.9,1558.8 839.4,1557.1 770.6,1564.7 598.2,1564.2 381.2,1569.0 382.1,1535.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[380.0,272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6336653,41.8744776]}},{"type":"Feature","properties":{"resourceCoords":[1188.0,1564.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6316412,41.872196]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p73","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0073","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"954.2,305.3 958.9,1531.2 811.8,1553.1 731.8,1560.2 529.0,1555.0 528.0,1510.1 522.4,305.7 522.3,265.0 726.0,264.5 950.0,264.0 954.2,305.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[529.0,1555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6316412,41.872196]}},{"type":"Feature","properties":{"resourceCoords":[950.0,264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6306857,41.874518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p74","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0074","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"669.7,257.8 724.8,257.8 928.1,259.1 927.7,302.5 922.9,834.2 945.0,945.9 948.5,1033.4 924.0,1157.0 924.8,1548.1 887.6,1548.2 549.8,1546.9 494.0,1555.0 498.0,299.3 494.0,257.0 669.7,257.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[494.0,1555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6306098,41.8722524]}},{"type":"Feature","properties":{"resourceCoords":[494.0,257.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6306857,41.874518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0075","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"926.3,322.5 927.5,1551.0 519.2,1549.3 515.5,1158.9 539.1,1035.5 535.0,948.1 512.1,836.9 513.1,262.8 931.4,262.4 926.3,322.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[717.0,1557.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62913543660991,41.87227578503527]}},{"type":"Feature","properties":{"resourceCoords":[927.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62870421228551,41.87489727102022]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p76","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0076","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"736.9,1555.3 673.9,1528.2 557.8,1528.3 523.0,1553.0 521.6,316.3 526.6,255.8 772.4,253.3 992.0,256.0 993.5,356.3 1019.5,413.4 1018.1,1557.1 736.9,1555.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[523.0,1553.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6286414,41.8722927]}},{"type":"Feature","properties":{"resourceCoords":[992.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6275996,41.8745607]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0077","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"438.7,1374.7 441.1,259.6 415.8,203.8 591.0,204.4 1086.0,200.9 1076.7,965.8 1077.7,1166.7 1075.5,1640.1 437.2,1644.2 438.7,1374.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[423.0,1400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6275224077129,41.87225507815956]}},{"type":"Feature","properties":{"resourceCoords":[1086.0,205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62598808029205,41.87440622278089]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0078","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"388.1,1635.5 391.6,1167.5 391.2,968.9 402.8,212.9 742.7,212.0 1088.8,206.4 1088.5,273.1 1079.3,273.2 1125.6,558.6 1066.8,856.7 1104.0,1568.4 1058.1,1634.2 388.1,1635.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[390.0,209.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62601940972834,41.87442000500361]}},{"type":"Feature","properties":{"resourceCoords":[1084.0,209.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62433927235472,41.874446753084854]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0008","type":"ImageService3","width":1465,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"782.6,289.3 774.7,489.2 807.0,514.2 850.8,500.9 963.1,439.8 1026.1,389.6 1035.0,416.3 965.2,468.1 888.7,513.4 790.7,550.3 791.0,568.1 917.8,517.7 1042.2,437.9 1076.0,582.2 1083.8,885.3 1083.3,1183.2 399.6,1178.8 358.3,1121.5 353.1,605.0 424.0,605.8 423.6,516.1 667.8,517.9 758.2,510.1 765.9,366.8 764.0,289.9 782.6,289.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[377.0,884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62799786269996,41.8862845245696]}},{"type":"Feature","properties":{"resourceCoords":[1068.0,1187.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62632313184233,41.885753265064366]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0080","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"361.3,363.5 348.4,322.3 567.4,317.8 741.3,318.5 810.6,310.9 1127.0,312.9 1128.1,313.1 1179.0,1608.5 347.1,1599.0 348.7,1385.6 335.0,1385.2 361.3,363.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0080/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63443619060911,41.87271212762278]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63091200879701,41.87278012411852]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63079952688707,41.86950169250762]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63432370869917,41.86943369601188]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.68"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0081","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1159.4,1552.3 706.5,1551.3 705.7,1569.0 301.4,1552.0 291.9,257.7 325.8,263.9 367.8,272.1 528.1,277.1 608.2,273.2 810.6,251.4 1140.0,263.4 1150.0,263.7 1159.4,1552.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0081/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.632459633429,41.87263699599977]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6289178872573,41.87279044452015]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62866404815884,41.869495670785305]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63220579433053,41.869342222264926]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p82","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0082","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"190.5,276.9 216.7,276.5 614.0,275.0 647.5,250.9 759.8,249.9 820.8,275.6 1092.8,275.1 1093.7,542.4 1097.7,1205.2 1099.8,1308.5 1100.1,1354.9 1042.4,1355.5 1044.0,1571.6 260.9,1554.7 190.5,276.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[614.0,275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6286414,41.8722927]}},{"type":"Feature","properties":{"resourceCoords":[1064.0,275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.6275554,41.8723004]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0083","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"409.4,1623.7 405.2,999.1 403.2,895.6 399.7,231.4 1038.5,222.4 1042.2,742.8 1047.8,1147.2 1049.4,1655.6 410.0,1667.0 409.4,1623.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62843924082392,41.872227986194865]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62490946058979,41.87225545548298]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62486402063355,41.86897177311887]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62839380086768,41.86894430383076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0084","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1137.1,1666.6 1136.5,1638.8 371.1,1651.5 370.9,1147.1 366.6,745.8 364.3,229.6 1037.3,222.8 1021.6,245.6 1056.8,992.3 1291.2,1458.1 1280.9,1667.0 1176.0,1710.0 1137.1,1666.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0084/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62683563311089,41.87225467321686]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62327779661685,41.8722898757678]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62321956278808,41.86898017485573]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62677739928212,41.86894497230479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p85","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0085","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"64.0,1220.5 86.7,1461.1 162.4,1581.4 344.2,1656.6 1033.5,1686.7 1124.4,1761.9 1336.5,1792.0 1345.7,1789.3 1345.5,1779.9 1363.9,1627.0 1365.0,1617.7 1364.0,1569.6 1358.5,1460.1 1354.6,1143.5 1341.5,729.2 1328.8,674.8 1321.0,317.4 1319.2,200.8 912.5,207.2 912.1,201.2 81.6,213.0 77.7,1.0 64.0,1.0 64.0,1220.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0085/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63370425728294,41.87024728703383]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63017355698955,41.87024727459646]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6301735775635,41.86696272769305]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63370427785689,41.86696274013042]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0086","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"73.8,1814.6 78.5,1814.7 117.5,1804.4 112.3,1677.3 977.2,1693.3 1276.7,1773.5 1389.9,1753.2 1411.0,1652.0 1364.6,1653.0 1367.9,1387.9 1369.9,617.0 1369.6,574.0 1370.5,10.1 1357.0,9.0 1356.1,1.0 1349.9,1.0 1349.0,11.0 1312.6,10.2 1312.3,215.1 527.8,191.2 528.4,203.7 76.7,220.4 76.4,353.9 77.5,708.9 89.1,763.2 94.5,1174.8 92.5,1489.3 96.0,1598.1 102.9,1598.0 96.2,1645.8 96.2,1655.0 94.9,1655.0 73.8,1806.5 73.8,1814.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0086/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63074389067708,41.870314587478795]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62718929654481,41.87036384194852]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62710782135115,41.86705699389799]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.63066241548341,41.867007739428274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p87","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0087","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1337.9,1722.1 980.2,1683.9 979.3,1409.4 470.6,1434.3 466.9,1451.9 420.8,1452.7 425.5,1189.5 431.7,424.0 1062.2,421.3 1065.8,630.2 1066.1,878.9 1061.7,1455.5 1218.6,1456.6 1344.1,1464.4 1337.9,1722.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0087/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6284889037874,41.869998157014116]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6249098011597,41.870062526063805]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62480332448533,41.86673285950396]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62838242711302,41.86666849045427]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0088","type":"ImageService3","width":1476,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"537.5,1458.6 380.1,1456.2 389.4,878.1 391.1,628.7 389.3,419.1 1152.2,421.1 1152.2,448.8 1190.2,492.8 1158.7,745.1 1225.0,1245.7 994.4,1424.3 664.5,1428.5 663.3,1467.5 537.5,1458.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0088/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62686251715812,41.870015551035344]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62329405777473,41.87010191293184]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62315120123573,41.86678215224125]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62671966061912,41.86669579034476]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p89","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.66"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0089","type":"ImageService3","width":1478,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1232.4,1517.4 782.9,1519.4 612.7,1518.1 419.6,1497.1 405.3,1537.7 355.9,1525.0 93.4,1474.4 63.3,1261.4 172.2,1052.2 177.2,750.9 125.5,689.8 171.7,170.7 1245.8,139.5 1347.2,608.3 1279.8,621.7 1276.0,1173.8 1249.5,1234.2 1249.2,1303.5 1230.5,1303.3 1232.2,1501.0 1232.4,1517.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0089/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62089970432551,41.88909075614608]}},{"type":"Feature","properties":{"resourceCoords":[1478.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62084134490044,41.88644441001026]}},{"type":"Feature","properties":{"resourceCoords":[1478.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.62524451954972,41.88639058060746]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.6253028789748,41.88903692674328]}},{"type":"Feature","properties":{"resourceCoords":[1248.0,1501.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62446,41.8868112]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1906 | sanborn01790_017 p90","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0090","type":"ImageService3","width":1478,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1125.1,1501.5 908.6,1502.4 658.8,1499.2 82.1,1479.6 83.2,1458.3 68.2,1458.0 69.8,1421.9 86.0,1406.1 70.1,1405.7 74.1,1210.0 92.6,1210.7 94.8,1142.2 122.8,1083.1 142.4,536.9 209.5,525.5 122.6,58.7 1358.2,58.7 1425.9,211.1 1437.1,1115.0 1384.9,1276.8 1443.5,1311.9 1439.0,1419.7 1366.4,1509.9 1125.1,1501.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[655.0,1224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62395526041124,41.88579820171787]}},{"type":"Feature","properties":{"resourceCoords":[1330.0,1224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.62388080586555,41.884578642983456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0094__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 | 1906 | sanborn01790_017 p94 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.58"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5912.0"},{"label":"split_canvas_h","value":"7324.0"}],"created":"2026-10-18T05:43:12Z","modified":"2026-10-18T05:43:12Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0094__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0094","type":"ImageService3","width":1478,"height":1831},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1352.2,1768.8 1393.8,1051.3 654.7,962.2 568.5,127.3 51.6,117.1 89.0,1760.8 1352.2,1768.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790190601S:01790_01S_1906-0094__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61710728950405,41.884322542120344]}},{"type":"Feature","properties":{"resourceCoords":[1478.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61724551803961,41.885631982158124]}},{"type":"Feature","properties":{"resourceCoords":[1478.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.615081858378,41.88576036949636]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1831.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.61494362984243,41.88445092945858]}}]}}]}