{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01846_004.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Elgin, Illinois | 1903 | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"64"},{"label":"placed","value":"42"},{"label":"unplaced","value":"22"},{"label":"fit sources","value":"georef-snap 24, georef 18"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"11 sheet(s) cut into 41 panels"},{"label":"unplaced pages","value":"p21__1 (tier 1, 42.04153,-88.29085 +/-100m); p21__2 (tier 1, 42.04275,-88.29180 +/-225m); p21__3 (tier 1, 42.03747,-88.29819 +/-100m); p24__1 (tier 2, 42.04908,-88.27943 +/-444m); p24__3 (tier 1, 42.04636,-88.27810 +/-100m); p2__2 (tier 1, 42.03661,-88.28274 +/-122m); p30__3 (tier 1, 42.04382,-88.29445 +/-100m); p30__7 (tier 1, 42.04344,-88.29539 +/-100m); p30__8 (tier 1, 42.04304,-88.29631 +/-113m); p30__9 (tier 1, 42.03242,-88.28892 +/-100m); p31__1 (tier 1, 42.02684,-88.26981 +/-112m); p31__2 (tier 1, 42.02765,-88.27070 +/-100m); p31__4 (tier 1, 42.02794,-88.27083 +/-100m); p31__5 (tier 1, 42.02600,-88.27064 +/-129m); p32__1 (tier 4, 42.03880,-88.27922 +/-2326m); p32__2 (tier 4, 42.03880,-88.27922 +/-2326m); p32__3 (tier 4, 42.03880,-88.27922 +/-2326m); p32__4 (tier 4, 42.03880,-88.27922 +/-2326m); p33__1 (tier 1, 42.05217,-88.28642 +/-207m); p33__2 (tier 1, 42.05093,-88.28577 +/-181m); p34__2 (tier 1, 42.03483,-88.29844 +/-104m); p34__3 (tier 1, 42.03435,-88.29768 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.8,169.8 49.8,634.0 38.5,634.0 40.7,1202.8 90.0,1202.4 90.3,1281.3 45.8,1281.3 52.5,1701.0 39.1,1728.1 23.5,1759.0 15.5,1774.9 4.6,1796.6 554.6,1791.5 550.6,1770.2 969.3,1779.1 968.6,1745.5 1284.0,1745.0 1612.0,1743.8 1612.0,1742.3 1612.0,1740.2 1574.2,1737.8 1550.0,1404.1 1569.5,1099.0 1538.7,867.0 1580.3,605.4 1511.3,105.0 901.0,36.9 906.1,1.0 887.6,1.0 807.4,165.5 135.7,170.0 49.8,169.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1225.0,625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2771675,42.0428695]}},{"type":"Feature","properties":{"resourceCoords":[1284.0,1745.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2770407,42.0407874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"98.0,1875.9 77.0,1121.6 68.9,1121.5 64.3,363.2 120.3,363.4 59.6,30.2 467.9,41.2 467.5,8.5 775.1,9.8 1095.1,10.6 1095.1,7.1 1096.1,7.2 1561.0,39.2 1599.7,173.7 1590.7,367.4 1582.7,367.4 1583.1,1124.3 1597.0,1124.4 1570.9,1882.5 1284.5,1881.5 1198.8,1881.2 974.7,1877.8 589.6,1878.1 102.0,1876.0 98.0,1875.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[480.0,355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27779911929362,42.040130634887426]}},{"type":"Feature","properties":{"resourceCoords":[341.0,1860.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27816137701447,42.03726370223456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p12","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1547.8,1600.3 1544.8,1840.3 1544.9,1856.9 1056.7,1850.7 1056.8,1883.3 596.6,1841.8 574.3,1856.3 187.4,1854.9 131.8,1864.2 87.3,1895.6 87.3,1494.2 89.3,1053.8 89.6,986.3 91.1,489.9 90.3,98.0 90.5,83.8 578.1,120.9 578.1,87.0 1060.3,93.9 1060.2,89.7 1543.0,122.8 1543.8,698.6 1547.2,1187.8 1547.8,1600.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[577.0,740.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2781574,42.0363203]}},{"type":"Feature","properties":{"resourceCoords":[1060.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2796277,42.0354193]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p13 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2466.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"5186.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1519.3,1567.8 1508.1,702.6 1481.1,702.9 1480.8,665.2 581.1,693.9 581.3,708.9 70.6,716.7 70.9,1124.2 72.5,1536.6 72.8,1623.6 71.2,1837.2 558.5,1871.3 558.3,1837.5 1039.8,1841.5 1039.8,1837.3 1522.1,1867.5 1521.8,1818.4 1519.3,1567.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1500.0,701.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27366492344179,42.034531067488835]}},{"type":"Feature","properties":{"resourceCoords":[90.0,701.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27363365938953,42.03717354431318]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p13 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"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":"6452.0"},{"label":"split_canvas_h","value":"2466.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1531.9,133.0 1049.3,100.6 1049.4,89.3 722.1,87.8 530.4,78.4 39.0,47.8 39.9,556.8 54.8,556.9 54.6,543.8 785.5,611.8 1538.2,593.8 1575.8,228.1 1531.9,133.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0013__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1046.0,89.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27111958879652,42.03714142165191]}},{"type":"Feature","properties":{"resourceCoords":[58.0,556.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2736174863118,42.036253832666745]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p14 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"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":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"202.3,1410.0 128.4,1507.1 9.4,1766.2 47.9,1830.7 654.9,1900.0 1555.8,1872.8 1578.0,1836.8 1573.5,1479.8 1586.5,1479.7 1595.8,1023.7 1532.8,834.2 1532.0,690.3 1480.2,604.0 1406.5,423.4 1392.7,389.4 983.0,558.1 825.2,599.9 571.8,931.0 421.5,1121.5 202.3,1410.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1371.0,399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27806940841516,42.03392922811551]}},{"type":"Feature","properties":{"resourceCoords":[199.0,1473.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28197035474993,42.034447114690735]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p14 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"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":"6042.8"},{"label":"split_canvas_h","value":"6279.2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"888.8,113.7 859.8,97.2 32.4,105.8 37.8,357.8 49.6,984.8 61.6,1475.7 158.3,1345.6 372.0,961.4 381.1,966.5 1124.2,247.7 888.8,113.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0014__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[62.0,1042.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27820639379289,42.03448955947687]}},{"type":"Feature","properties":{"resourceCoords":[62.0,94.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27582381857911,42.03445344540817]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.7,1603.1 34.4,1584.5 61.3,234.7 34.9,219.2 389.0,207.1 389.3,219.9 842.0,219.2 1028.6,152.6 1171.4,148.7 1255.8,95.5 1433.5,18.4 1457.3,8.1 1579.2,1034.6 1558.4,1043.5 1514.6,1085.5 1523.2,1376.3 1521.6,1562.9 1523.3,1847.7 1028.4,1770.8 750.0,1730.9 340.0,1658.2 39.7,1603.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1452.0,0.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27805369790921,42.033897649411756]}},{"type":"Feature","properties":{"resourceCoords":[1518.0,1802.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27525230447297,42.03125423524843]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"633.9,1859.8 637.0,1816.5 964.5,1879.6 1505.2,1856.8 1568.9,1728.6 1557.8,184.8 1365.2,21.6 1073.5,22.4 1072.9,1.0 1035.7,1.0 1035.8,26.7 180.2,32.5 174.2,846.6 157.5,874.9 10.3,1123.2 1.0,1176.5 1.0,1183.4 176.0,1407.8 283.4,1556.8 450.5,1781.7 505.3,1754.0 633.9,1859.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1031.0,1365.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27368919477304,42.03197849849789]}},{"type":"Feature","properties":{"resourceCoords":[1031.0,41.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27368032635269,42.03448883797076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p17","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.59"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"291.9,127.7 1.0,138.8 1.0,141.2 23.6,193.2 106.0,198.3 53.4,337.1 33.4,1622.0 41.0,1763.9 112.0,1848.7 266.2,1777.2 312.2,1689.4 462.5,1662.4 876.1,1826.9 1533.8,1813.4 1552.4,1791.3 1572.7,243.5 1595.6,200.2 1520.9,52.9 1460.0,56.2 972.0,88.4 698.1,109.7 291.9,127.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1554.0,914.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2740721,42.0297602]}},{"type":"Feature","properties":{"resourceCoords":[1554.0,1355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2736196,42.0289876]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0018","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1612.0,1799.4 1612.0,1726.2 1563.1,1710.7 1592.1,1319.6 1539.2,755.6 1611.3,248.2 1569.7,48.9 552.6,36.5 482.8,1.0 41.9,1.0 28.3,459.6 28.9,1010.4 17.1,1774.0 115.2,1879.3 1308.3,1861.4 1314.9,1912.0 1339.0,1912.0 1356.5,1766.0 1612.0,1799.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[509.0,1026.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28788189847988,42.035153842938946]}},{"type":"Feature","properties":{"resourceCoords":[509.0,1613.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28916205995701,42.03459731529011]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0019","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"97.9,1876.2 1549.2,1856.5 1553.4,1861.0 1555.9,1087.8 1548.6,530.3 1556.7,64.9 1612.0,64.2 1612.0,1.0 1296.6,1.0 1225.5,15.5 1175.4,1.0 1171.5,1.0 1151.7,39.5 1016.3,71.3 559.5,20.6 244.6,59.1 270.9,115.9 143.7,118.8 64.7,232.3 34.2,544.0 81.1,543.7 84.3,1017.9 82.9,1067.1 97.9,1876.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1527.0,1082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28848371319195,42.03599832346082]}},{"type":"Feature","properties":{"resourceCoords":[1527.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28731658625162,42.036491686938945]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0020","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1602.6,1840.5 1542.2,1887.9 442.7,1894.4 101.6,1828.9 27.1,1530.4 19.8,766.8 27.1,376.9 69.9,210.8 111.6,67.0 259.8,17.3 1576.0,20.8 1588.8,2.8 1556.8,308.0 1602.7,308.1 1602.6,772.8 1600.8,821.0 1609.5,1629.8 1602.6,1840.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1122.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.29216343250866,42.03855645300904]}},{"type":"Feature","properties":{"resourceCoords":[45.0,759.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.29208203644231,42.0409449987779]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0021__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p21 [4]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.81"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3678.4"},{"label":"split_canvas_w","value":"2556.8"},{"label":"split_canvas_h","value":"3973.6"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0021__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0021","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"28.3,966.1 66.5,1877.2 573.0,1879.8 592.0,940.5 28.3,966.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0021__4/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,919.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29676610889724,42.03625762030133]}},{"type":"Feature","properties":{"resourceCoords":[639.2,919.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29513865899382,42.036263785896374]}},{"type":"Feature","properties":{"resourceCoords":[639.2,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.2951257651208,42.03438069930994]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29675321502422,42.034374533714896]}},{"type":"Feature","properties":{"resourceCoords":[119.0,1754.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2964522,42.0346769]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.38"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0022","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"566.3,1878.3 514.0,1826.1 139.1,1884.8 92.4,1810.3 62.3,1800.2 41.8,1832.5 60.6,90.7 165.5,90.9 195.6,31.4 307.9,91.2 345.5,39.2 592.9,24.8 1027.5,100.2 1454.9,34.2 1540.0,70.7 1539.1,328.1 1533.6,1838.9 1533.6,1840.9 1076.0,1874.8 1075.9,1886.4 566.3,1878.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29057444270475,42.04708511603089]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28666581482473,42.04709157627389]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.28665556962493,42.04362489469465]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.29056419750495,42.04361843445165]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0023","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1854.0 1.0,1876.2 145.5,1873.8 1296.9,1869.3 1339.3,1868.8 1583.2,1866.0 1569.4,1404.9 1565.3,1404.9 1575.4,940.2 1559.5,940.5 1534.4,57.5 1489.8,72.5 929.3,14.3 47.1,60.2 28.5,1574.9 74.8,1854.3 1.0,1854.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1285.0,944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2824883,42.0481609]}},{"type":"Feature","properties":{"resourceCoords":[129.0,26.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2853876,42.0499109]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p24 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"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":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.0,1166.8 64.2,1794.4 352.2,1836.5 474.4,1778.5 533.2,989.8 533.2,953.2 535.9,953.2 536.1,950.9 1514.8,947.3 1550.5,875.2 1562.2,911.0 1554.9,119.8 705.4,29.4 419.4,80.5 419.7,220.2 439.3,220.2 441.1,346.1 376.4,559.7 376.4,565.6 376.4,628.3 376.4,953.2 376.4,953.2 376.4,985.1 376.4,1028.0 234.5,1028.0 193.0,1164.9 62.0,1166.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,765.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28104248727516,42.05127576054999]}},{"type":"Feature","properties":{"resourceCoords":[1541.0,214.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27965797870678,42.04995599265807]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p24 [4]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2132.8"},{"label":"split_canvas_y","value":"3812.8"},{"label":"split_canvas_w","value":"4319.2"},{"label":"split_canvas_h","value":"3839.2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"749.1,1912.0 795.0,1908.9 1593.0,1907.0 1593.0,1894.8 1540.7,1356.3 1578.4,1122.1 1510.9,987.4 1445.3,974.2 691.0,962.6 668.6,962.9 662.4,963.0 646.9,1400.7 626.8,1403.3 749.1,1912.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0024__4/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1199.1,1405.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27677635851668,42.045546025590646]}},{"type":"Feature","properties":{"resourceCoords":[628.2,973.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27822010476538,42.04639158581315]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.71"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0025","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1217.4,1877.4 75.8,1879.7 40.0,1835.7 66.3,55.1 655.6,25.1 1519.9,107.0 1604.0,405.9 1593.9,819.9 1592.2,961.0 1612.0,961.2 1612.0,1023.6 1612.0,1088.5 1543.5,1303.3 1542.5,1372.6 1537.8,1700.8 1536.7,1776.4 1393.3,1774.3 1349.5,1912.0 1217.0,1912.0 1217.4,1877.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[930.0,952.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27965849861987,42.05328676265162]}},{"type":"Feature","properties":{"resourceCoords":[73.0,1529.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28112324375715,42.054865314852144]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p26 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.54"},{"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":"2192.8"},{"label":"split_canvas_h","value":"5115.2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"484.2,1171.7 498.9,139.6 147.2,77.4 62.0,206.9 127.8,400.0 58.4,758.8 88.3,945.0 326.3,1151.2 484.2,1171.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[519.2,1197.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2681424,42.0568579]}},{"type":"Feature","properties":{"resourceCoords":[519.2,152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2654911,42.056845]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p26 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2192.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4259.2"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"650.8,1791.1 966.9,1842.3 1520.3,1822.4 1578.0,1750.7 1603.7,370.6 1525.3,111.5 1389.0,39.3 878.8,23.4 627.0,73.0 598.1,130.4 632.9,518.7 587.5,1287.7 627.2,1310.0 627.2,1310.0 626.7,1401.9 651.7,1474.8 650.8,1791.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1012.1,1306.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27063121965969,42.051296610000534]}},{"type":"Feature","properties":{"resourceCoords":[574.2,171.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27174658283201,42.05342409482018]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p26 [3]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.74"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4327.2"},{"label":"split_canvas_w","value":"2508.8"},{"label":"split_canvas_h","value":"3324.8"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"607.6,1882.1 598.8,1306.5 29.7,1132.8 23.4,1876.6 607.6,1882.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0026__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[259.1,1297.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2676621,42.0540955]}},{"type":"Feature","properties":{"resourceCoords":[259.1,1787.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2677116,42.0531897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p27","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0027","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"154.2,1793.4 32.0,1791.8 66.4,1015.9 52.1,1015.6 59.3,240.6 67.5,240.7 78.7,42.5 1489.1,68.7 1535.5,32.2 1531.2,258.6 1542.8,258.6 1566.7,1039.0 1546.7,1038.8 1542.2,1349.4 1560.9,1845.5 1255.5,1843.0 1061.6,1832.8 564.8,1800.1 154.2,1793.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1048.0,1032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2724771,42.0386468]}},{"type":"Feature","properties":{"resourceCoords":[569.0,247.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2736935,42.0401]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p28","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0028","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"110.9,1864.6 111.0,1853.3 85.8,1853.3 63.3,1366.1 65.0,1060.8 84.7,1060.9 54.7,294.4 43.3,294.4 45.6,71.9 107.2,22.7 1510.4,29.5 1581.7,150.6 1575.6,327.6 1502.0,327.5 1526.5,1440.5 1587.3,1440.1 1560.7,1874.5 584.8,1881.8 590.7,1894.4 110.9,1864.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[313.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2705954,42.0386396]}},{"type":"Feature","properties":{"resourceCoords":[1484.0,1847.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.26761,42.0371525]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p29","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0029","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1458.9,149.4 1586.2,497.2 1592.1,530.0 1588.9,678.4 1596.8,678.5 1548.1,1876.2 72.3,1869.3 29.6,1618.2 55.6,223.6 474.0,17.6 782.3,20.9 874.9,105.0 1237.8,14.6 1405.3,46.5 1458.9,149.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[295.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.284845,42.029835]}},{"type":"Feature","properties":{"resourceCoords":[731.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2848078,42.0290341]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p2 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"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":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1495.2,97.2 1021.8,97.8 1022.3,129.4 575.5,95.4 554.1,109.8 178.9,113.7 125.2,123.5 82.5,154.5 86.0,723.3 92.2,1291.2 99.3,1708.5 137.7,1830.9 180.6,1912.0 573.3,1912.0 625.2,1892.8 614.9,1650.8 682.4,1509.9 1124.2,1181.0 1242.9,1179.0 1533.7,1013.4 1568.3,811.3 1503.7,545.6 1501.6,428.5 1495.2,97.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[550.0,717.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28254856576187,42.03635901675655]}},{"type":"Feature","properties":{"resourceCoords":[550.0,110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28097113136403,42.03633930751942]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p3","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.3,203.9 46.3,1230.7 115.2,1668.0 1.0,1673.9 1.0,1729.0 51.0,1785.0 124.9,1912.0 358.2,1912.0 442.9,1867.9 568.9,1829.4 997.5,1825.1 1581.0,1823.0 1586.2,1347.8 1577.9,136.4 1002.5,138.8 1002.3,167.5 1.0,193.6 1.0,211.1 72.3,203.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1581.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825145,42.0395679]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,1823.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2825446,42.0372547]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p30 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.51"},{"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":"2478.8"},{"label":"split_canvas_h","value":"2508.8"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"25.6,71.9 1.1,621.7 279.6,567.9 606.2,611.8 589.0,61.8 25.6,71.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[90.0,586.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2705431,42.0428497]}},{"type":"Feature","properties":{"resourceCoords":[90.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2705519,42.0438344]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p30 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.62"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2458.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2103.6"},{"label":"split_canvas_h","value":"2318.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1120.8,301.1 1049.2,309.4 1049.5,55.0 904.2,56.4 901.1,32.7 758.9,70.1 641.2,20.2 639.7,551.5 1073.5,565.5 1120.8,301.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1049.5,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2884139,42.0330795]}},{"type":"Feature","properties":{"resourceCoords":[1049.5,697.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2877727,42.0319551]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p30 [4]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2490.0"},{"label":"split_canvas_w","value":"2490.4"},{"label":"split_canvas_h","value":"1672.4"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"24.2,1026.2 547.4,1002.2 557.0,999.9 599.3,648.0 23.9,641.6 24.2,1026.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__4/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[153.9,675.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.29586166618796,42.04362698095771]}},{"type":"Feature","properties":{"resourceCoords":[418.7,675.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.29523704434148,42.04379353095815]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p30 [5]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.59"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2477.2"},{"label":"split_canvas_y","value":"2318.0"},{"label":"split_canvas_w","value":"2084.8"},{"label":"split_canvas_h","value":"1496.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"652.1,896.1 724.5,938.8 987.8,894.3 1106.6,951.9 1125.5,598.0 1010.0,640.8 655.5,601.9 652.1,896.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__5/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[665.3,899.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.285269,42.026289]}},{"type":"Feature","properties":{"resourceCoords":[1112.5,899.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.284059,42.02632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__6/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p30 [6]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.18"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2026.4"},{"label":"split_canvas_y","value":"3814.0"},{"label":"split_canvas_w","value":"2535.6"},{"label":"split_canvas_h","value":"1768.8"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__6/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"889.0,1392.7 1118.8,1392.4 1132.2,979.5 606.7,967.2 524.3,1032.7 530.3,1312.5 598.6,1327.8 624.5,1327.5 697.3,1326.9 796.7,1365.8 834.1,1380.4 889.0,1392.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0030__6/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[529.6,1215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2707987,42.0245414]}},{"type":"Feature","properties":{"resourceCoords":[1106.5,1394.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.269152,42.0245298]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0031__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p31 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4158.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2294.0"},{"label":"split_canvas_h","value":"4676.0"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0031__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0031","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1554.8,955.9 1504.1,114.9 1417.3,21.5 1087.3,171.9 1135.8,327.1 1081.3,1022.1 1501.5,1118.6 1554.8,955.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0031__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1095.5,783.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27140830862777,42.026660846768266]}},{"type":"Feature","properties":{"resourceCoords":[1518.1,929.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27026866441793,42.026682637677034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p34 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.50"},{"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":"2494.4"},{"label":"split_canvas_h","value":"3210.4"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"590.1,784.1 600.6,34.0 21.9,45.1 50.7,788.7 590.1,784.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[315.8,560.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2685,42.0191956]}},{"type":"Feature","properties":{"resourceCoords":[315.8,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2685394,42.0200356]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p34 [4]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.50"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3191.6"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"4460.4"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"165.5,799.2 91.8,798.6 109.2,1912.0 170.1,1912.0 172.0,1883.3 1555.5,1877.7 1583.3,844.7 164.3,828.7 165.5,799.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0034__4/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[70.0,1354.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.26761,42.0389774]}},{"type":"Feature","properties":{"resourceCoords":[70.0,850.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.267618,42.0399308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0035","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1221.3,20.5 1548.0,62.9 1601.1,740.5 1558.5,1867.5 37.3,1883.2 59.6,268.3 54.5,268.2 54.5,260.4 201.7,261.2 234.0,254.9 576.8,123.1 677.9,68.3 1221.3,20.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[648.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2811694,42.0254195]}},{"type":"Feature","properties":{"resourceCoords":[1514.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.279008,42.025449]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"597.7,1842.8 997.4,1844.7 1435.8,1848.8 1499.0,1849.3 1480.2,1084.9 1472.0,1084.8 1470.0,316.4 1526.7,316.8 1470.2,1.0 925.8,1.0 847.9,152.2 516.0,153.5 30.1,150.0 24.5,1360.8 13.8,1835.6 597.7,1842.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1158.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27965027022896,42.0381548159447]}},{"type":"Feature","properties":{"resourceCoords":[1158.0,1837.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27964802354634,42.03725607779031]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"35.9,77.9 42.3,1124.4 109.0,1482.4 39.3,1805.4 68.4,1876.9 183.2,1897.7 583.8,1858.9 583.9,1841.3 1584.7,1818.8 1584.9,1790.2 1585.0,1135.0 1586.5,1052.1 1581.1,30.9 790.8,26.6 437.3,28.2 437.3,30.2 1.0,66.4 1.0,77.7 35.9,77.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1013.0,480.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28539633476929,42.042902140227326]}},{"type":"Feature","properties":{"resourceCoords":[1013.0,32.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2853894096459,42.04374524214016]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"623.5,56.0 1225.4,57.2 1576.6,59.6 1574.5,522.1 1563.2,522.0 1562.9,1088.9 1612.0,1088.7 1612.0,1167.3 1567.6,1167.2 1572.5,1585.3 1559.0,1612.3 1535.2,1658.8 1445.8,1834.2 1111.3,1837.1 621.5,1835.9 41.7,1834.5 43.8,1173.3 45.5,1089.7 43.5,59.2 623.5,56.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1181.0,528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28109652665061,42.0428601966372]}},{"type":"Feature","properties":{"resourceCoords":[621.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28249941485353,42.043719261027185]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1557.7,634.9 1555.5,56.9 1081.6,55.0 124.5,55.5 117.3,1211.8 118.3,1358.0 96.1,1357.8 90.5,1751.2 1.0,1756.6 1.0,1784.9 86.7,1784.9 1549.5,1785.0 1549.5,1429.6 1557.7,634.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[593.0,1207.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28538831688462,42.0455476442208]}},{"type":"Feature","properties":{"resourceCoords":[1534.0,1207.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28539140650655,42.04378648259262]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"325.9,1876.2 1483.3,1882.0 1515.1,1882.2 1537.7,1882.3 1473.2,1333.3 1565.8,983.5 1508.7,783.7 1558.6,740.9 1587.0,469.6 1508.3,120.0 1458.3,48.6 1060.8,24.0 216.8,25.1 252.4,13.5 214.8,1.0 211.3,1.0 197.1,31.4 54.4,77.7 69.7,955.9 85.5,955.9 70.5,1417.8 74.5,1417.8 83.3,1876.5 325.9,1876.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[366.0,948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28103938725593,42.04817641011209]}},{"type":"Feature","properties":{"resourceCoords":[919.0,35.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27963067029451,42.049901557587894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1903 | sanborn01846_004 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T03:07:56Z","modified":"2026-10-19T03:07:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1045.2,24.7 1340.5,66.4 1340.5,84.2 1502.7,163.2 1507.3,821.3 1506.4,1250.8 1508.1,1842.6 1040.5,1843.7 96.0,1850.2 95.7,1808.2 91.8,1324.8 89.3,171.2 89.2,145.8 529.1,166.8 531.5,187.1 1044.6,70.5 1045.2,24.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461903:01846_1903-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[560.0,714.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.27959211821845,42.045525112590106]}},{"type":"Feature","properties":{"resourceCoords":[1026.0,1840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.28247698212556,42.044657689458425]}}]}}]}