{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_070.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1919 | 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":"98"},{"label":"placed","value":"64"},{"label":"unplaced","value":"34"},{"label":"fit sources","value":"georef 37, georef-snap 26, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"1 sheet(s) cut into 3 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 41.88958,-87.80275 +/-262m); p110__1 (tier 1, 41.93054,-87.81160 +/-233m); p110__2 (tier 1, 41.92591,-87.81739 +/-116m); p110__3 (tier 1, 41.92364,-87.80923 +/-182m); p14 (tier 1, 41.88688,-87.79607 +/-258m); p15 (tier 4, 41.87425,-87.77585 +/-8268m); p17 (tier 2, 41.93268,-87.72441 +/-100m); p2 (tier 1, 41.88957,-87.80257 +/-261m); p21 (tier 1, 41.85632,-87.77741 +/-259m); p27 (tier 1, 41.84874,-87.79178 +/-262m); p3 (tier 1, 41.89430,-87.79584 +/-289m); p34 (tier 1, 41.87436,-87.78936 +/-262m); p35 (tier 1, 41.87304,-87.78910 +/-268m); p39 (tier 1, 41.87010,-87.79022 +/-261m); p41 (tier 1, 41.87993,-87.78121 +/-259m); p46 (tier 1, 41.86525,-87.78903 +/-260m); p48 (tier 1, 41.86535,-87.78175 +/-260m); p5 (tier 2, 41.89144,-87.76765 +/-5826m); p55 (tier 2, 41.83393,-87.79646 +/-100m); p56 (tier 2, 41.86213,-87.79196 +/-464m); p57 (tier 2, 41.86478,-87.79251 +/-100m); p58 (tier 1, 41.86432,-87.78764 +/-262m); p6 (tier 1, 41.88618,-87.79027 +/-261m); p60 (tier 1, 41.86350,-87.78322 +/-273m); p63 (tier 1, 41.85795,-87.79459 +/-270m); p65 (tier 2, 41.85615,-87.78967 +/-108m); p66 (tier 1, 41.85799,-87.78615 +/-259m); p67 (tier 1, 41.82673,-87.79605 +/-262m); p69 (tier 1, 41.85625,-87.79056 +/-263m); p7 (tier 2, 41.87530,-87.79112 +/-100m); p70 (tier 1, 41.86546,-87.75695 +/-263m); p77 (tier 1, 41.84770,-87.74503 +/-129m); p78 (tier 1, 41.89512,-87.75132 +/-236m); p8 (tier 1, 41.88957,-87.78549 +/-267m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p10","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0010","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1345.0,2100.0 281.6,2100.0 77.2,2100.0 79.9,1079.9 84.6,1079.9 54.6,105.1 60.8,108.1 475.2,33.3 1293.4,48.9 1405.2,96.0 1411.4,163.8 1367.1,2105.2 1345.0,2100.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[834.0,2100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.775264,41.861793]}},{"type":"Feature","properties":{"resourceCoords":[1345.0,2100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7740317,41.8618104]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p101","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"29"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0101","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"20.6,2060.3 20.5,2047.7 20.4,2034.2 75.1,2035.5 93.9,1916.6 65.9,1628.2 98.6,1312.0 79.0,534.8 56.9,522.9 93.8,76.0 352.3,47.1 609.2,66.6 729.6,36.9 1352.8,45.9 1377.0,102.7 1369.9,554.2 1447.0,566.1 1447.0,1666.0 1438.0,1667.0 1438.0,1685.0 1447.0,1686.0 1447.0,1736.0 1437.0,1739.0 1437.0,1758.0 1447.0,1759.0 1447.0,1794.0 1437.0,1796.0 1437.0,1812.0 1447.0,1814.0 1446.8,1841.0 1430.0,1842.0 1430.0,1858.0 1437.0,1859.0 1439.0,1867.0 1446.6,1867.0 1445.6,2005.2 1438.0,2006.0 1438.0,2028.0 1430.0,2030.0 1430.0,2074.0 1436.0,2075.0 1430.0,2078.0 1429.0,2128.0 1356.1,2128.0 1190.8,2107.5 1190.8,2099.7 812.2,2107.0 812.5,2072.8 235.0,2064.3 184.8,2062.9 20.6,2060.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[821.0,1069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8011018,41.9344536]}},{"type":"Feature","properties":{"resourceCoords":[547.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8025911,41.9380601]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p102","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0102","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"17.6,2061.6 12.0,1128.0 14.6,543.1 66.8,550.8 98.1,57.2 709.2,27.8 1352.2,70.4 1400.0,547.2 1373.9,1280.7 1403.8,1581.0 1353.9,2070.4 1357.0,2118.8 1011.0,2114.9 1011.0,2122.2 759.0,2119.5 759.0,2117.7 503.5,2097.4 503.6,2065.8 20.5,2061.7 17.6,2061.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1013.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7931294,41.9345632]}},{"type":"Feature","properties":{"resourceCoords":[508.0,48.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.795699,41.938162]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p103","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0103","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1292.5,876.6 1300.0,876.6 1323.5,1307.7 1339.9,1307.7 1387.4,1765.7 1390.2,1766.3 1393.3,1767.1 1399.6,2053.9 1434.3,2054.0 1435.0,2077.0 1447.0,2083.1 1403.0,2081.9 1375.8,2118.4 1301.1,2123.7 405.8,2128.1 148.7,2117.1 56.7,2073.4 45.3,1554.7 76.0,1260.9 39.5,972.6 75.8,746.1 51.0,566.4 68.8,70.9 144.2,46.9 180.4,81.5 306.9,92.5 655.4,39.0 1294.0,64.6 1292.5,876.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[537.0,1553.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.81362385464425,41.925184114740574]}},{"type":"Feature","properties":{"resourceCoords":[285.0,1681.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8148311519762,41.924695267420226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p104","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0104","type":"ImageService3","width":1446,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.6,2087.9 223.9,2064.8 189.0,2064.7 182.9,1776.9 179.8,1776.1 177.0,1775.4 129.5,1315.8 113.2,1315.8 89.7,883.1 82.2,883.1 84.1,68.2 117.2,39.3 543.9,40.4 685.4,67.0 813.7,29.5 1161.1,36.5 1181.6,36.9 1181.8,63.1 1346.6,65.1 1345.5,566.5 1339.4,1575.1 1222.7,1573.2 1217.9,2024.8 1192.2,2018.7 834.3,2064.6 834.2,2081.7 566.1,2103.6 236.6,2094.1 224.6,2087.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[851.0,1073.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80629449209016,41.92710411283581]}},{"type":"Feature","properties":{"resourceCoords":[81.0,1741.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8099303599246,41.924616445720154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p105","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0105","type":"ImageService3","width":1441,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.0,19.0 797.1,20.8 797.2,55.1 1178.0,43.4 1178.0,51.2 1431.9,79.7 1431.8,46.1 1440.0,34.0 1440.0,364.0 1431.0,365.0 1431.0,382.0 1440.0,383.0 1440.0,529.2 1440.0,802.0 1431.0,803.0 1431.0,820.0 1440.0,821.0 1440.0,986.0 1431.0,987.0 1431.0,1008.0 1440.0,1009.0 1440.0,1041.1 1434.7,1041.0 1435.0,1168.5 1430.0,1169.0 1430.0,1187.0 1435.0,1188.5 1435.5,1348.5 1430.0,1349.0 1430.0,1366.0 1435.6,1367.1 1436.0,1526.3 1429.0,1527.0 1429.0,1545.0 1436.1,1545.7 1436.5,1704.3 1428.0,1705.0 1428.0,1722.0 1436.6,1722.7 1436.8,1802.3 1431.0,1803.0 1431.0,1819.0 1436.8,1819.7 1437.0,1849.3 1431.0,1850.0 1431.0,1874.0 1437.0,1874.7 1437.0,1881.3 1429.0,1882.0 1429.0,1898.0 1437.1,1898.7 1437.1,1900.3 1431.0,1903.0 1431.0,1919.0 1437.2,1919.7 1437.2,1924.3 1431.0,1925.0 1431.0,1942.0 1437.2,1942.7 1437.3,1980.2 1428.0,1981.0 1428.0,1997.0 1437.3,1997.8 1437.4,2013.2 1428.0,2014.0 1428.0,2050.1 1212.7,2047.8 1184.3,2050.2 803.9,2106.8 803.9,2078.1 803.7,2043.3 426.3,2038.4 305.7,2034.8 258.1,2027.9 52.7,1985.1 53.8,1532.0 170.9,1533.0 168.6,521.2 165.5,19.2 209.0,19.0 209.1,18.9 216.0,19.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[53.0,1978.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80438305721327,41.923737731312244]}},{"type":"Feature","properties":{"resourceCoords":[806.0,528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80089130094731,41.929003687574536]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p106","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0106","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"12.6,882.4 15.0,882.0 16.0,180.0 19.9,20.1 27.1,20.1 506.4,22.8 506.4,54.1 760.0,73.5 760.0,75.3 1010.1,77.2 1010.1,70.0 1353.4,72.8 1378.1,437.9 1331.1,1377.0 1375.4,1723.5 1375.2,2061.7 1348.5,2094.5 1095.9,2088.8 721.8,2039.6 721.8,2041.5 508.1,2040.8 508.1,2037.4 790.5,2037.9 790.5,2035.9 17.8,2026.0 17.0,1716.0 9.0,1715.0 16.0,1713.0 15.0,911.0 12.6,910.4 12.6,882.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[760.0,1531.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7940702,41.9254392]}},{"type":"Feature","properties":{"resourceCoords":[760.0,24.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7942347,41.9309101]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p107","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0107","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"300.6,113.7 300.6,96.5 658.9,49.6 684.6,55.6 889.5,99.5 937.0,106.6 1057.4,110.9 1434.1,117.8 1434.1,152.6 1434.0,184.8 1432.0,185.0 1432.0,201.0 1434.0,201.2 1433.9,238.8 1432.0,239.0 1432.0,261.0 1439.6,261.9 1432.8,713.8 1432.7,800.9 1432.0,801.0 1432.0,818.0 1432.6,818.1 1431.5,1339.0 1431.0,1339.0 1431.0,1355.0 1431.5,1355.1 1431.1,1517.9 1430.0,1518.0 1431.1,1532.9 1430.8,1702.9 1430.0,1703.0 1430.0,1722.0 1430.7,1722.1 1430.3,1880.9 1429.0,1881.0 1429.0,1897.0 1430.3,1897.1 1430.0,2043.0 1423.0,2047.0 1423.0,2080.0 1423.6,2080.2 1424.0,2101.5 539.0,2132.6 71.2,2101.6 84.5,1303.5 47.2,1152.7 101.2,951.6 105.1,801.8 48.3,534.2 54.9,137.0 300.6,113.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1059.0,1125.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80243836191444,41.919899101520656]}},{"type":"Feature","properties":{"resourceCoords":[49.0,607.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80738867528007,41.921668424794746]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p108","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0108","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"13.5,677.3 16.4,146.7 391.5,89.2 420.0,86.7 636.3,88.1 636.1,51.9 645.6,51.0 645.6,51.7 645.8,88.1 1441.0,93.5 1441.0,95.6 1154.3,96.8 1154.4,100.2 1371.3,99.7 1391.2,490.3 1352.2,1021.4 1395.9,1346.5 1391.4,1621.7 1348.3,1715.3 1332.0,2016.8 1135.4,2047.5 1104.5,2092.2 901.1,2077.5 655.6,2127.4 615.4,2127.4 52.5,2078.6 18.0,2080.1 16.4,2025.3 23.5,2021.1 13.5,683.6 13.5,677.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[777.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7970319,41.9223698]}},{"type":"Feature","properties":{"resourceCoords":[394.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7988731,41.9223472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p109","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0109","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"281.5,1987.2 143.4,1983.9 108.9,2020.4 55.9,1735.3 87.4,880.9 58.2,536.7 87.8,74.3 94.8,96.9 129.1,67.8 636.9,68.7 768.2,41.9 913.2,71.5 1029.7,40.7 1346.0,85.5 1347.0,2090.8 629.5,2111.2 281.5,1987.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0109/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1197.0,1622.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7769939,41.9256363]}},{"type":"Feature","properties":{"resourceCoords":[945.0,100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7783928,41.9311128]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0011","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1281.8,1082.2 1312.2,1082.4 1351.9,2044.2 1264.2,2101.6 174.9,2055.7 93.8,1730.0 141.2,1122.2 61.8,473.2 149.3,39.5 1283.6,50.8 1281.8,1082.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[738.0,2081.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8026477,41.8577549]}},{"type":"Feature","properties":{"resourceCoords":[738.0,65.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8027854,41.8613712]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p111","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0111","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1408.3,568.6 1405.8,568.6 1398.8,1071.8 1404.3,1071.8 1395.7,1575.9 1396.8,2080.8 922.8,2074.8 90.6,2067.2 86.2,2061.4 64.0,1501.4 112.5,1361.0 44.8,1105.7 122.6,988.4 60.5,524.4 153.7,109.2 767.1,36.2 1363.3,52.3 1399.5,82.9 1408.3,568.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[724.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7517193,41.9369488]}},{"type":"Feature","properties":{"resourceCoords":[724.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7517852,41.9387721]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p112","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0112","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1388.5,2126.9 1388.5,2097.0 329.1,2088.9 34.0,2085.1 33.2,1577.1 42.2,1070.0 36.7,1069.9 44.0,563.6 46.5,563.6 38.0,74.8 74.9,106.0 83.8,53.8 789.9,28.2 1344.6,50.9 1387.5,100.9 1404.2,92.2 1399.7,1105.6 1413.4,1126.3 1410.4,1228.0 1400.1,1236.3 1401.8,1743.9 1397.8,1760.3 1402.2,2133.2 1388.5,2126.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0112/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[372.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7492672,41.9369767]}},{"type":"Feature","properties":{"resourceCoords":[372.0,567.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7493009,41.9378881]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p113","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0113","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"916.3,52.6 1386.8,59.0 1387.5,1578.7 1385.2,1578.7 1396.9,2068.7 1367.8,2059.4 1208.9,2114.9 100.9,2091.4 54.5,539.4 133.8,114.7 80.3,44.0 916.3,52.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[719.0,1572.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7515443,41.932384]}},{"type":"Feature","properties":{"resourceCoords":[719.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7516475,41.9351248]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p114","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0114","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.9,1561.9 53.2,1561.9 51.7,54.6 349.5,58.5 1398.5,66.5 1398.6,96.1 1373.1,84.4 1376.9,2105.5 291.7,2120.2 62.7,2047.9 50.9,1561.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0114/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[392.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7491321,41.9333248]}},{"type":"Feature","properties":{"resourceCoords":[392.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7491997,41.9351512]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p115","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0115","type":"ImageService3","width":1440,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"10.0,1717.0 14.0,1701.0 13.3,1204.2 23.4,1196.0 26.5,1096.5 13.1,1076.2 13.8,981.0 14.0,981.0 14.0,941.4 19.6,84.3 130.7,26.8 1363.1,77.8 1316.1,179.2 1396.6,438.7 1406.7,1092.7 1322.2,1464.8 1369.1,1620.5 1360.2,1656.9 1382.2,1672.3 1370.6,2068.6 781.3,2124.7 437.9,2063.2 76.5,2111.3 13.6,2082.1 10.0,1717.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0115/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[520.0,1060.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7455314,41.9370279]}},{"type":"Feature","properties":{"resourceCoords":[520.0,65.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7456038,41.9388552]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p116","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0116","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1331.0,47.4 1326.9,83.3 1223.9,546.8 1258.8,546.8 1287.5,1044.8 1236.7,1044.3 1295.7,2057.9 1374.1,2058.2 1374.0,2097.7 280.2,2117.2 102.4,2076.2 59.8,1978.5 75.3,1241.6 165.7,841.4 74.1,593.7 135.6,505.6 160.0,51.9 135.2,38.8 1331.0,47.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[371.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7295083,41.9345004]}},{"type":"Feature","properties":{"resourceCoords":[371.0,2055.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7294306,41.9317633]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p117","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0117","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1438.7,1996.8 1434.9,2057.9 1435.2,2065.6 940.1,2123.8 63.6,2063.4 65.3,1582.8 124.3,1397.2 33.0,996.0 56.2,110.8 141.6,31.1 617.8,21.8 618.0,23.0 634.0,23.0 636.4,21.4 778.9,18.6 798.5,18.2 797.6,64.4 1065.0,69.2 1441.0,225.5 1441.0,362.0 1432.0,363.0 1432.0,379.0 1441.0,380.0 1441.0,625.0 1432.0,626.0 1432.0,644.0 1441.0,645.0 1441.0,796.0 1431.0,797.0 1431.0,813.0 1441.0,815.0 1441.0,855.6 1423.9,1092.8 1433.5,1093.0 1434.2,1161.8 1432.0,1162.0 1432.0,1180.0 1434.4,1180.3 1435.8,1309.5 1430.0,1310.0 1432.0,1350.0 1436.2,1350.5 1438.0,1511.3 1432.0,1512.0 1432.0,1538.0 1438.3,1538.7 1439.0,1599.5 1441.0,1679.4 1441.0,1690.0 1432.0,1691.0 1432.0,1718.0 1441.0,1719.0 1441.0,1769.5 1437.0,1971.8 1438.7,1996.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[434.0,1085.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.73295227813531,41.93717791376646]}},{"type":"Feature","properties":{"resourceCoords":[434.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.73303802751407,41.93901929060262]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p118","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0118","type":"ImageService3","width":1442,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"342.7,64.2 1384.3,70.3 1398.1,131.5 1349.4,295.3 1416.0,1001.2 1408.0,2020.3 1362.8,2102.3 159.5,2091.9 66.0,2042.5 18.4,2048.7 18.0,2041.0 30.0,2040.0 25.0,1984.0 21.0,1980.0 19.0,1955.0 17.6,1954.8 17.7,1944.2 20.0,1935.0 18.4,1891.3 21.4,1667.5 26.0,1667.0 26.0,1605.0 22.3,1602.9 22.6,1583.3 19.3,1583.3 21.0,1474.0 25.0,1457.0 21.0,1420.0 24.0,1354.0 18.0,1347.0 22.0,1345.0 23.0,1172.0 19.0,1120.0 12.0,1115.0 17.0,1113.0 15.0,988.0 2.7,987.2 2.2,963.8 13.0,963.0 13.0,946.0 3.3,945.2 3.7,938.2 18.0,939.0 19.0,913.0 10.0,912.0 8.0,901.0 6.0,901.0 7.1,881.9 20.0,880.0 17.0,838.0 22.0,833.0 21.0,607.0 17.0,604.0 21.0,600.0 21.0,560.0 16.0,559.0 11.0,453.0 21.0,449.0 21.0,200.5 342.7,64.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0118/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[396.0,572.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7296191,41.938152]}},{"type":"Feature","properties":{"resourceCoords":[396.0,2094.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7295361,41.9354124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.55"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0012","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"177.7,37.0 674.4,40.7 1258.3,115.9 1364.3,666.9 1274.9,1220.3 1384.8,1328.3 1275.8,2054.0 1027.0,2092.7 250.8,2027.7 208.8,1067.4 178.4,1067.2 177.7,37.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[721.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8000975,41.8595943]}},{"type":"Feature","properties":{"resourceCoords":[721.0,58.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8001606,41.861412]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0013","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.8,114.5 502.0,131.6 601.3,64.0 845.1,42.5 1301.7,135.4 1392.4,264.4 1398.4,612.3 1337.1,695.2 1389.4,914.7 1335.5,1020.4 1403.7,1103.8 1406.8,2064.3 347.9,2119.8 89.3,2050.6 90.8,114.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0013/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79734247768069,41.88878907897653]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79386160617467,41.88880139947773]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7938373879355,41.884955635175054]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79731825944151,41.884943314673855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0016","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"766.2,39.0 1043.8,128.3 1271.6,88.7 1338.5,135.4 1385.1,1660.6 1329.2,2102.3 306.5,2117.3 306.8,2077.6 227.2,2077.0 170.1,1055.0 221.6,1055.5 193.8,553.5 158.4,553.3 264.3,86.4 766.2,39.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0016/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72784313030925,41.93551535823674]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72433442225058,41.935578409842755]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72421039270796,41.93170469983065]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72771910076663,41.931641648224634]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0018","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1257.2,2101.2 327.4,2116.1 56.4,2050.7 143.0,1390.0 83.2,1351.0 123.4,1207.0 57.4,1091.8 134.7,986.5 80.3,620.3 133.1,179.8 81.0,133.2 505.9,33.8 1063.4,134.4 1305.2,77.8 1305.1,1135.7 1454.2,1484.7 1305.0,1864.9 1305.0,2136.1 1258.5,2136.1 1257.2,2101.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0018/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72712182097447,41.94142729117829]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.72706344025588,41.93881592156755]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7322005429454,41.9387514707552]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.732258923664,41.94136284036594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p19","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0019","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1223.6,58.0 1422.4,58.1 1421.2,1066.9 1422.1,1066.9 1414.8,2076.3 1226.5,2076.2 1185.9,2076.2 25.8,2076.3 25.0,2055.1 131.1,2031.5 77.8,1694.8 123.4,1650.9 90.0,1448.8 155.0,1166.5 107.7,904.5 190.4,85.5 179.7,58.9 1223.6,58.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1180.0,58.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.777716,41.8617585]}},{"type":"Feature","properties":{"resourceCoords":[673.0,58.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7789469,41.8617411]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p20","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0020","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.7,2071.4 43.0,1059.2 42.1,1059.2 45.2,47.5 52.0,47.5 264.7,47.9 1324.0,50.0 1346.0,55.3 1404.3,485.9 1412.6,1877.8 1371.0,2078.9 1323.2,2088.2 1323.2,2074.3 53.3,2071.4 33.7,2071.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[310.0,2072.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7763841,41.8581266]}},{"type":"Feature","properties":{"resourceCoords":[310.0,48.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7764865,41.8617758]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p22","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0022","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"328.0,2069.2 94.5,2069.3 44.5,1622.0 68.1,84.7 154.8,65.7 180.7,81.5 1347.2,82.8 1348.4,2068.8 328.0,2069.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[834.0,2069.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7787505,41.8545191]}},{"type":"Feature","properties":{"resourceCoords":[834.0,82.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7788477,41.8580924]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.46"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0023","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1395.5,1124.9 1396.8,1124.9 1399.4,2007.0 1359.5,2002.2 1190.0,2093.8 836.0,2104.6 239.5,2109.4 128.6,2055.8 104.0,397.1 167.9,146.4 659.4,176.8 862.0,98.8 1146.2,118.5 1147.3,242.3 1180.1,249.1 1385.8,248.0 1395.5,1124.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0023/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7839898356567,41.85458471253238]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78044807958219,41.85462904441446]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78036068804886,41.85070035295671]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78390244412337,41.85065602107463]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p24","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.39"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0024","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"633.0,2132.0 312.7,2134.7 317.5,2092.6 72.4,2062.9 71.7,1192.8 70.5,1192.8 62.8,327.9 324.8,327.1 324.4,156.8 1317.8,154.8 1318.1,316.4 1357.7,316.4 1364.0,316.3 1394.5,1190.0 1407.0,1189.9 1411.5,2133.9 633.0,2132.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7807841,41.8547787]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7771678,41.8548289]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7770682,41.8508457]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7806845,41.8507955]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p25","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0025","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"40.5,89.0 78.0,89.0 270.8,89.5 1443.3,92.2 1444.5,101.0 1444.5,105.0 1391.5,115.1 1444.1,904.5 1429.5,1934.5 1392.2,2034.2 973.4,1983.5 973.3,2079.0 938.2,2073.3 272.1,2072.9 77.9,2072.8 40.5,2072.8 40.5,1919.7 40.5,89.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[508.0,2073.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7762755,41.8542581]}},{"type":"Feature","properties":{"resourceCoords":[508.0,90.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7763841,41.8581266]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0026","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.1,208.3 231.8,214.4 935.5,235.9 972.3,243.1 975.4,142.2 1416.2,209.1 1400.2,248.2 1424.9,1917.2 1363.2,2133.8 1236.8,2133.5 210.2,2101.7 23.1,2095.3 21.1,2040.4 21.5,2040.5 47.8,1083.5 35.4,1083.1 33.1,208.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[946.0,1110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7750122,41.8526641]}},{"type":"Feature","properties":{"resourceCoords":[481.0,222.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7762755,41.8542581]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.28"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0028","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.0,83.0 1447.0,119.0 1456.7,120.0 1457.0,121.0 1385.7,119.0 1344.7,2066.7 791.5,2121.7 276.9,2110.8 69.4,2047.2 49.0,535.4 70.4,232.1 147.4,115.2 1211.7,80.0 1337.0,80.1 1444.0,83.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0028/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79125442235127,41.87630831863213]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78771399481609,41.87636427326635]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78760364711898,41.87243862882292]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79114407465417,41.8723826741887]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.22"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0029","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.4,2034.8 41.9,1316.3 105.2,332.7 45.0,162.6 96.8,58.1 1386.2,57.3 1436.1,2049.4 1236.5,2108.5 157.2,2079.1 144.9,2043.0 83.4,2034.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0029/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78822470431848,41.88012393968055]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78449646744008,41.880183027749716]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78437994067149,41.876049126875884]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78810817754989,41.87599003880672]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.15"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0030","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.4,2019.8 42.8,1768.0 102.1,1639.3 142.6,1244.8 85.3,1193.9 24.3,819.8 90.5,66.4 1370.6,66.1 1417.2,432.9 1391.9,2070.1 646.6,2104.9 322.2,2008.0 83.4,2019.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78836796572999,41.85088454581564]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78471721695125,41.85091466990699]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78465783516647,41.846864948730776]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78830858394521,41.84683482463942]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p31","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0031","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"444.4,37.7 1225.1,47.9 1225.0,60.6 1224.6,60.6 1227.7,115.6 1390.0,117.6 1385.4,1085.7 1391.6,1085.8 1377.7,2081.3 1364.4,2081.2 659.0,2074.5 124.0,2068.0 65.6,1897.3 80.7,374.3 123.1,37.0 444.4,37.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1127.0,1084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7773523,41.8489712]}},{"type":"Feature","properties":{"resourceCoords":[614.0,2074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7785493,41.8471202]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0032","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"94.1,2096.1 100.0,1087.5 93.8,1087.6 90.5,107.0 116.2,107.0 1158.9,108.4 1287.2,104.9 1360.0,143.2 1399.1,752.2 1382.5,1886.7 1331.6,2097.9 284.1,2096.4 94.1,2096.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[328.0,1082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77614164196314,41.84900106265193]}},{"type":"Feature","properties":{"resourceCoords":[1341.0,1082.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77366835961254,41.8490400232285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p33","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0033","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.9,2049.8 120.5,1804.7 57.4,1616.7 114.3,1401.4 69.5,1057.0 128.2,759.6 51.0,534.0 91.2,57.1 1390.6,40.5 1438.9,1601.8 1397.9,2116.1 397.6,2109.3 62.9,2049.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[150.0,2061.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7931251,41.8432715]}},{"type":"Feature","properties":{"resourceCoords":[150.0,34.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7932317,41.8469341]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0036","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"21.0,2070.4 21.0,2034.9 56.8,2031.5 70.5,1988.4 140.5,1399.1 102.7,146.0 452.1,37.3 1357.4,57.0 1415.0,381.6 1413.5,2032.5 1339.0,2105.8 805.7,2116.1 272.4,2066.8 21.0,2070.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78291889376197,41.876437986746296]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77936010261273,41.87645233962051]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.77933179889872,41.87250612756858]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78289059004797,41.87249177469436]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p37","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0037","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"657.5,36.4 1372.2,32.5 1394.3,32.4 1400.1,1035.2 1404.9,1035.2 1421.1,2043.7 1238.9,2045.2 1176.8,2045.8 884.0,2048.0 79.4,2049.9 98.5,1928.5 66.2,548.4 117.9,44.8 115.4,37.9 657.5,36.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1130.0,1038.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7772496,41.8453123]}},{"type":"Feature","properties":{"resourceCoords":[624.0,2048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7784498,41.8434623]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p38","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0038","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"277.4,2068.1 105.3,2068.4 95.2,1050.8 90.3,1050.8 90.8,39.0 273.8,39.2 1330.8,40.0 1324.8,65.2 1394.5,1780.5 1374.2,2042.0 1335.0,2068.3 277.4,2068.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[826.0,1048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7748105,41.8453565]}},{"type":"Feature","properties":{"resourceCoords":[826.0,2068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7747601,41.843518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p4","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0004","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1352.4,113.0 1353.5,495.5 1392.2,495.4 1350.2,2097.8 486.4,2101.7 142.5,2026.6 93.3,1867.8 150.1,1328.3 101.0,1169.5 143.6,937.6 86.4,801.2 142.8,622.2 56.7,440.1 64.1,94.7 1285.5,99.3 1352.4,113.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[304.0,1126.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7950043,41.8633211]}},{"type":"Feature","properties":{"resourceCoords":[1351.0,1126.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7924792,41.8633618]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0040","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1295.4,2099.4 369.4,2085.4 110.3,1981.6 102.0,85.7 849.9,50.4 1318.7,128.9 1391.2,544.4 1363.8,2048.3 1295.4,2099.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78523728161848,41.87027569311671]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78515585847536,41.86764281274675]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7903475419206,41.86755251991978]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79042896506371,41.87018540028974]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0042","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1398.3,116.4 1389.7,2056.3 1335.7,2107.5 99.0,2085.5 77.7,2032.5 79.5,62.4 642.7,20.6 663.4,55.2 919.0,56.2 1398.3,116.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.7844367255612,41.872719431567965]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78093561500985,41.87278210935475]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78081202335977,41.86889959731168]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78431313391113,41.868836919524895]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p43","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.28"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0043","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1081.1,57.6 1377.3,57.1 1432.2,57.0 1429.7,196.8 1433.5,1207.8 1430.5,1207.8 1436.8,2081.2 1337.2,2081.1 818.0,2080.0 112.8,2080.6 83.9,1804.3 149.8,1512.9 70.1,1000.9 125.7,851.9 73.1,483.0 155.4,124.4 261.2,89.0 266.9,54.6 1081.1,57.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[818.0,2080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7783509,41.8398248]}},{"type":"Feature","properties":{"resourceCoords":[818.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7784498,41.8434623]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p44","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0044","type":"ImageService3","width":1458,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1429.4,62.1 1393.2,86.4 1390.5,2061.8 884.2,2060.9 435.9,2060.1 135.1,2059.4 28.8,2059.2 27.0,1419.0 23.6,1418.8 22.0,1198.0 25.0,1198.0 21.0,201.0 25.0,173.0 23.5,63.1 31.4,63.1 383.5,62.2 1429.4,62.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[926.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7747109,41.8416918]}},{"type":"Feature","properties":{"resourceCoords":[926.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7747601,41.843518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.29"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0045","type":"ImageService3","width":1451,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1041.8,2115.6 114.7,2103.9 64.7,2041.8 46.9,293.6 122.2,78.0 468.0,30.4 1356.8,63.2 1430.0,917.1 1388.1,2053.0 1436.8,2055.1 1436.3,2093.9 1055.5,2089.2 1046.1,2132.4 1041.4,2132.4 1041.8,2115.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78759812397624,41.86722417809988]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78746935216503,41.864607230718114]}},{"type":"Feature","properties":{"resourceCoords":[1451.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79265423243115,41.86446373473265]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79278300424235,41.86708068211442]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.58"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0047","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"81.8,2074.9 94.1,52.1 1379.7,64.1 1359.6,2090.9 893.2,2089.8 875.2,2116.6 81.8,2074.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0047/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78833273796731,41.83979067515883]}},{"type":"Feature","properties":{"resourceCoords":[1447.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78484783284694,41.8398454248767]}},{"type":"Feature","properties":{"resourceCoords":[1447.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78473911039181,41.8359494688718]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78822401551218,41.835894719153934]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0049","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1238.9,443.7 1319.4,1996.6 1237.8,1995.9 985.0,2083.7 597.4,2012.8 72.9,2084.8 127.3,1990.9 139.9,1344.1 263.0,1171.4 267.8,1017.1 175.9,896.6 184.4,146.8 554.5,70.0 552.3,45.9 1243.1,52.7 1238.9,443.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1235.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77837055000613,41.83981824884254]}},{"type":"Feature","properties":{"resourceCoords":[1235.0,2077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7782164761615,41.83611116136329]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0050","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"316.9,2024.0 215.2,436.1 214.7,36.4 943.2,36.8 1282.2,37.0 1268.4,2032.2 1241.6,2020.7 316.9,2024.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[206.0,32.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77837191586106,41.839832338968016]}},{"type":"Feature","properties":{"resourceCoords":[761.0,2066.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77694403768774,41.83620319204672]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p51","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0051","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1137.6,170.8 1307.8,196.6 1273.4,425.9 1162.0,431.1 1191.1,817.7 1286.7,864.2 1189.0,921.5 1136.0,2048.8 815.5,2109.0 251.5,2097.3 116.0,2038.6 133.3,69.7 550.1,70.7 1058.0,71.9 1137.6,170.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1101.0,2084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7733193,41.8362353]}},{"type":"Feature","properties":{"resourceCoords":[1098.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7734279,41.8398915]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p52","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0052","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"17.0,73.0 17.1,58.5 598.5,60.8 598.0,27.2 925.3,35.1 1010.3,102.0 1357.5,67.0 1378.2,110.8 1411.6,1129.0 1382.3,2051.9 1323.6,2093.8 731.1,2122.9 61.8,2042.0 56.7,1046.2 153.1,637.2 68.4,555.8 72.7,72.5 17.0,73.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[407.0,1048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7829687,41.8306066]}},{"type":"Feature","properties":{"resourceCoords":[407.0,552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7829984,41.8315339]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p53","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0053","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1225.0,2133.7 1213.6,2133.7 1147.8,2133.4 1147.9,2102.1 613.4,2076.8 613.5,2110.6 100.7,2126.1 52.4,2047.6 43.7,1803.4 86.1,104.3 1233.5,36.9 1373.5,55.1 1391.2,233.0 1446.0,227.4 1446.0,270.0 1436.0,271.0 1436.0,288.0 1446.0,290.0 1446.0,441.0 1437.0,442.0 1437.0,468.0 1446.0,469.0 1446.0,627.0 1435.0,628.0 1435.0,645.0 1446.0,647.0 1446.0,804.0 1436.0,805.0 1436.0,823.0 1446.0,824.0 1446.0,982.0 1436.0,983.0 1436.0,1001.0 1446.0,1003.0 1446.0,1153.0 1434.0,1154.0 1434.0,1170.0 1438.0,1181.0 1446.0,1181.0 1446.0,1330.0 1434.0,1331.0 1434.0,1348.0 1438.0,1358.0 1446.0,1358.0 1446.0,1434.0 1436.0,1435.0 1436.0,1451.0 1446.0,1453.0 1446.0,1508.0 1434.0,1509.0 1434.0,1544.0 1446.0,1545.0 1446.0,1685.0 1435.0,1686.0 1435.0,1721.0 1446.0,1722.0 1446.0,1755.0 1436.0,1756.0 1436.0,1774.0 1446.0,1775.0 1446.0,1792.0 1436.0,1793.0 1436.0,1835.0 1446.0,1837.0 1437.0,1838.0 1436.0,1869.0 1437.0,1913.0 1446.0,1914.0 1446.0,1934.0 1437.0,1935.0 1437.0,2018.0 1446.0,2019.0 1446.0,2074.6 1423.2,2080.6 1225.0,2133.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,48.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8017727,41.8358276]}},{"type":"Feature","properties":{"resourceCoords":[69.0,2456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8029457,41.8314086]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p54","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.57"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0054","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1221.0,2005.5 846.0,2108.0 820.7,2115.2 61.7,2069.6 22.9,2079.8 18.2,95.2 614.2,33.0 1129.6,139.7 1353.8,80.8 1396.2,1802.2 1333.0,1984.6 1325.8,2005.4 1221.0,2005.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[846.0,1854.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7976514,41.8325983]}},{"type":"Feature","properties":{"resourceCoords":[846.0,2108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7976389,41.8321681]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p59","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0059","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"436.0,2096.9 161.0,1955.0 155.3,1563.7 230.5,1249.6 153.0,81.8 18.1,74.3 18.1,46.4 484.6,48.8 484.4,67.2 1160.1,128.4 1299.0,297.2 1251.5,1341.6 1327.4,1629.3 1302.5,2042.4 1435.0,2045.5 1435.0,2071.0 1435.5,2071.1 1435.6,2080.5 829.5,2078.1 829.5,2093.2 436.0,2096.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1236.0,1572.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7830569,41.8333642]}},{"type":"Feature","properties":{"resourceCoords":[1236.0,477.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7831198,41.835328]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0061","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"584.6,130.0 584.3,96.1 1121.1,116.8 1121.3,148.2 1198.8,147.9 1397.3,92.8 1399.1,92.3 1417.2,337.7 1398.8,1080.9 1413.6,1080.9 1412.7,1965.8 1384.8,1963.5 1331.0,2081.3 106.5,2098.4 56.6,1994.5 38.5,806.4 114.8,221.5 70.0,150.0 584.6,130.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,711.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80287819591936,41.83099192426249]}},{"type":"Feature","properties":{"resourceCoords":[65.0,2090.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.80282331265806,41.82848454980379]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p62","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0062","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"45.5,1130.8 30.2,1130.8 53.3,361.4 36.0,107.2 131.5,82.0 863.6,126.0 888.0,119.0 1249.7,20.1 1270.7,20.1 1350.8,20.0 1336.8,60.4 1395.1,561.0 1393.6,2051.3 1338.7,2103.9 769.9,2114.7 39.7,2047.1 45.5,1130.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[888.0,119.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7976389,41.8321681]}},{"type":"Feature","properties":{"resourceCoords":[888.0,-126.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7976514,41.8325983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0064","type":"ImageService3","width":1447,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"80.9,1833.2 135.1,1244.2 71.5,1044.2 32.5,254.6 86.3,137.5 710.8,88.7 1318.5,150.2 1332.0,2052.7 818.5,2125.4 819.5,2136.1 128.3,2139.5 80.9,1833.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0064/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79308228466027,41.85809279103903]}},{"type":"Feature","properties":{"resourceCoords":[1447.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78955260848608,41.85813605812335]}},{"type":"Feature","properties":{"resourceCoords":[1447.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.78946665812589,41.85419143748017]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79299633430008,41.854148170395845]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.16"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0068","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1385.3,678.2 1397.7,1641.2 1333.2,2058.2 890.6,2025.3 821.9,2111.0 278.8,2117.9 91.5,2035.6 39.7,1627.9 98.2,741.0 59.2,125.1 585.8,49.0 581.1,23.4 642.5,21.6 1304.8,21.1 1385.3,678.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0068/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79403272907466,41.854206070083904]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79065313287784,41.85417342175435]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79071794052176,41.85039891736672]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.79409753671858,41.85043156569627]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p71","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0071","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1364.5,2068.8 1306.7,2110.8 129.7,2053.8 70.1,1605.5 72.0,1493.7 117.9,1419.9 61.7,770.3 123.0,667.0 132.5,100.5 207.5,72.0 1319.0,30.9 1366.8,71.3 1361.5,71.3 1357.2,988.6 1360.8,1889.1 1364.5,2068.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[350.0,1074.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7560658,41.8346722]}},{"type":"Feature","properties":{"resourceCoords":[350.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7561064,41.8364834]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p72","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0072","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"15.4,988.8 23.7,72.8 29.1,72.8 62.0,100.9 197.2,44.2 1254.6,36.8 1362.0,90.4 1362.0,1576.0 1377.0,1576.1 1363.6,2043.8 1338.8,2041.5 719.4,2110.3 138.9,2098.0 50.7,2044.0 17.9,2067.5 15.0,1888.0 15.4,988.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1362.0,1576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7503185,41.8338448]}},{"type":"Feature","properties":{"resourceCoords":[1362.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7503959,41.8365733]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p73","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"26"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0073","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.9,102.8 96.4,58.2 983.0,32.2 1358.2,40.3 1428.4,93.6 1427.9,2057.2 1390.2,2045.8 630.5,2112.0 41.0,2056.1 54.6,1584.5 39.5,1584.4 40.0,86.3 72.9,102.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[734.0,1587.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7486438,41.8338669]}},{"type":"Feature","properties":{"resourceCoords":[734.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7487226,41.8365995]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0074","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.5,105.4 110.2,47.1 655.5,34.4 818.4,111.3 1013.7,40.6 1334.4,61.0 1370.6,128.4 1391.0,1529.9 1321.4,2092.2 298.3,2111.4 46.1,2036.0 38.4,97.0 49.5,105.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74714404796508,41.83675208742017]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74363254593814,41.83679798270385]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74354147141923,41.83287492690263]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2156.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-87.74705297344617,41.83282903161896]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p75","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.48"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0075","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1411.3,2006.1 1351.4,2100.7 206.8,2114.8 46.3,2046.7 45.2,1019.6 120.7,859.2 131.1,624.6 67.2,469.7 107.8,169.5 57.8,66.1 1334.6,46.3 1414.1,135.4 1447.0,135.8 1447.0,273.0 1437.0,274.0 1437.0,292.0 1447.0,295.0 1447.0,451.0 1436.0,452.0 1436.0,470.0 1447.0,471.0 1447.0,630.0 1434.0,631.0 1434.0,647.0 1447.0,648.0 1447.0,1164.0 1433.0,1165.0 1433.0,1181.0 1447.0,1182.0 1447.0,1342.0 1434.0,1343.0 1434.0,1359.0 1447.0,1360.0 1447.0,1665.0 1438.0,1666.0 1438.0,1685.0 1447.0,1686.0 1447.0,1736.0 1438.0,1737.0 1438.0,1758.0 1447.0,1759.0 1447.0,1794.0 1437.0,1796.0 1437.0,1812.0 1447.0,1814.0 1447.0,1841.0 1435.0,1842.0 1435.0,1858.0 1447.0,1861.0 1447.0,1873.0 1429.0,1874.0 1429.0,1893.0 1447.0,1893.0 1447.0,1917.0 1437.0,1918.0 1437.0,1934.0 1447.0,1937.0 1447.0,2005.0 1438.0,2006.0 1438.0,2006.4 1411.3,2006.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[960.0,1104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7291699,41.8350204]}},{"type":"Feature","properties":{"resourceCoords":[960.0,2090.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7291377,41.8332073]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0076","type":"ImageService3","width":1448,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.6,2110.3 231.6,2079.1 124.0,1983.5 14.3,1982.2 16.0,1067.0 20.0,1066.0 20.0,1050.0 16.0,1048.0 18.7,133.0 45.1,133.3 118.5,61.7 416.1,43.6 1358.5,69.6 1401.1,142.7 1384.8,2064.2 412.6,2110.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[938.0,1099.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.72551433992955,41.83503651056321]}},{"type":"Feature","properties":{"resourceCoords":[938.0,94.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.72554506410196,41.83690601230826]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1919 | sanborn01790_070 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:20:06Z","modified":"2026-10-18T06:20:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0009","type":"ImageService3","width":1463,"height":2156},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1409.3,1101.1 1404.7,1101.1 1402.2,2114.3 1393.1,2114.3 1187.6,2114.3 143.7,2115.4 90.2,1984.1 96.1,81.8 1193.3,42.7 1379.4,132.9 1409.3,1101.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901919B:01790_B_1919-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[635.0,2106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.77895204249165,41.86175625496562]}},{"type":"Feature","properties":{"resourceCoords":[128.0,2106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.78018297210082,41.861739055629144]}}]}}]}