{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01898_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Granite City, Illinois | 1950 | 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":"99"},{"label":"placed","value":"69"},{"label":"unplaced","value":"30"},{"label":"fit sources","value":"georef 41, georef-snap 28"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"16 sheet(s) cut into 36 panels"},{"label":"unplaced pages","value":"p21__1 (tier 1, 38.70558,-90.16239 +/-262m); p21__2 (tier 1, 38.69570,-90.15185 +/-105m); p23 (tier 2, 38.69886,-90.15558 +/-100m); p27 (tier 1, 38.69749,-90.14688 +/-255m); p28__2 (tier 1, 38.71447,-90.14075 +/-100m); p29__1 (tier 1, 38.69758,-90.15636 +/-201m); p29__2 (tier 1, 38.70180,-90.15209 +/-134m); p2__2 (tier 1, 38.69695,-90.14016 +/-184m); p30 (tier 1, 38.70087,-90.15389 +/-255m); p31__1 (tier 1, 38.69142,-90.15445 +/-116m); p32__2 (tier 1, 38.66529,-90.17081 +/-100m); p44__2 (tier 1, 38.67579,-90.14579 +/-100m); p54 (tier 2, 38.68449,-90.15974 +/-100m); p55__1 (tier 1, 38.67087,-90.17109 +/-100m); p55__2 (tier 1, 38.67402,-90.16862 +/-205m); p55__3 (tier 1, 38.67120,-90.16830 +/-186m); p56 (tier 1, 38.66651,-90.16998 +/-256m); p63 (tier 4, 38.69567,-90.15025 +/-5453m); p65__1 (tier 1, 38.70417,-90.13733 +/-100m); p66__1 (tier 1, 38.67835,-90.17097 +/-222m); p66__2 (tier 1, 38.70267,-90.13361 +/-210m); p67__2 (tier 1, 38.71417,-90.13106 +/-113m); p68__1 (tier 4, 38.69567,-90.15025 +/-5453m); p68__2 (tier 4, 38.69567,-90.15025 +/-5453m); p68__3 (tier 1, 38.69709,-90.14129 +/-212m); p72__1 (tier 1, 38.68634,-90.14961 +/-100m); p74__1 (tier 4, 38.69567,-90.15025 +/-5453m); p74__2 (tier 4, 38.69567,-90.15025 +/-5453m); p77__2 (tier 1, 38.69958,-90.15091 +/-100m); p77__3 (tier 1, 38.69258,-90.13773 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p1","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0001","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"144.2,98.3 176.4,61.5 539.6,28.1 1506.4,90.0 1526.0,779.0 1598.9,853.2 1479.7,853.8 1475.4,1346.1 1469.5,1837.6 113.0,1837.0 113.4,1585.5 113.0,853.0 81.6,852.9 109.7,201.7 101.6,88.5 144.2,98.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[113.0,853.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.150611,38.705284]}},{"type":"Feature","properties":{"resourceCoords":[113.0,1837.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.148978,38.704034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0010","type":"ImageService3","width":1608,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"31.2,536.1 34.5,536.1 21.6,50.2 199.2,51.0 1023.7,49.8 1085.3,51.8 1094.7,14.0 1098.2,14.0 1098.3,37.4 1509.9,57.3 1568.6,162.9 1563.0,1877.9 446.7,1917.0 50.9,1829.8 47.5,1836.4 32.3,1528.5 47.4,1031.1 36.6,1031.2 31.2,536.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[487.0,1528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12716171544936,38.70318803707852]}},{"type":"Feature","properties":{"resourceCoords":[1554.0,540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12472645403322,38.70499062129133]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p11","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0011","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1580.8,402.4 1571.0,402.6 1576.8,1390.9 1572.2,1390.9 1576.5,1881.4 1595.6,1920.3 43.3,1904.7 53.7,122.4 1487.8,25.4 1583.5,108.0 1601.6,100.7 1580.8,402.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[316.0,905.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.164138,38.708206]}},{"type":"Feature","properties":{"resourceCoords":[1162.0,1883.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.162146,38.706445]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p12","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0012","type":"ImageService3","width":1608,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"336.5,1927.6 220.0,1918.0 79.5,1921.8 64.0,1892.0 48.8,1398.8 53.5,1398.7 25.5,404.7 35.3,404.3 49.5,100.5 209.9,31.3 538.4,19.8 912.8,90.0 1465.0,38.5 1562.8,97.0 1573.3,343.3 1556.0,344.0 1554.0,380.0 1556.0,391.0 1573.3,390.6 1573.8,599.4 1579.1,1002.6 1572.6,1356.0 1576.5,1856.7 1445.2,1858.3 1445.2,1914.2 336.5,1927.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1086.0,1008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.158792,38.708029]}},{"type":"Feature","properties":{"resourceCoords":[1086.0,155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.158768,38.709569]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p13","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0013","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1606.0,1827.8 1603.9,834.0 1599.4,834.0 1604.8,341.6 1603.5,341.6 1601.3,97.2 961.7,19.9 181.1,35.7 74.2,101.3 73.2,323.4 57.9,372.8 74.5,371.9 75.6,838.1 73.6,838.1 57.4,1330.3 1.0,1329.9 1.0,1366.3 22.6,1366.0 49.8,1801.0 206.1,1826.2 772.7,1826.0 1177.8,1821.2 1533.0,1828.2 1606.0,1827.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[323.0,838.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155366,38.709545]}},{"type":"Feature","properties":{"resourceCoords":[323.0,1826.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157641,38.709564]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p14","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0014","type":"ImageService3","width":1611,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"522.8,1948.0 522.2,1898.5 825.3,1880.1 1014.9,1641.2 1287.8,1571.4 1319.0,1711.6 1610.0,1766.2 1610.0,524.0 1210.8,139.1 1100.0,1.0 1087.0,1.0 1087.0,10.0 1066.9,11.5 1063.4,109.5 515.0,27.2 86.3,61.9 79.6,121.2 35.8,115.9 38.2,356.7 39.5,356.7 34.7,842.0 39.1,841.9 42.3,1821.2 466.0,1818.0 467.6,1948.0 522.8,1948.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[466.0,841.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155398,38.706465]}},{"type":"Feature","properties":{"resourceCoords":[466.0,1818.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157681,38.706486]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p15","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0015","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,988.1 1.0,1926.0 248.0,1932.0 471.0,1926.0 477.2,1926.5 1292.2,1869.7 1292.1,1862.3 1523.1,1861.9 1575.2,1863.3 1586.2,945.2 1605.0,945.2 1561.2,26.3 1523.8,26.4 838.0,29.0 838.0,58.4 228.2,34.1 122.3,42.0 86.4,50.7 31.3,203.0 31.7,374.4 62.0,375.0 63.0,422.0 31.8,421.5 32.6,778.9 1.0,807.3 1.0,808.3 21.3,829.4 1.0,988.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[838.0,945.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.152209,38.704021]}},{"type":"Feature","properties":{"resourceCoords":[838.0,29.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.150611,38.705284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p16","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016","type":"ImageService3","width":1611,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.2,1150.3 1442.6,1478.2 944.5,1475.5 447.0,1477.0 282.9,1477.8 231.8,479.9 446.8,478.8 1439.0,477.0 1439.2,1150.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[447.0,1477.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.150587,38.702771]}},{"type":"Feature","properties":{"resourceCoords":[1439.0,477.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.147367,38.702788]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p16a","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016a","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"321.5,1458.3 252.1,1456.3 263.9,465.7 447.2,465.5 941.6,465.7 1436.4,470.1 1434.3,808.8 1436.6,1463.1 1436.7,1464.9 1009.9,1462.3 1008.8,1477.5 695.7,1471.6 503.6,1477.6 445.4,1472.8 445.4,1458.9 445.4,1455.8 321.5,1458.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0016a/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[946.0,1467.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15138961976996,38.70086203430041]}},{"type":"Feature","properties":{"resourceCoords":[946.0,486.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14980360535884,38.70211549268296]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017","type":"ImageService3","width":1598,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1476.2,1493.8 1597.0,1487.6 1597.0,1252.3 1597.0,1175.2 1535.9,1116.0 1535.0,1017.5 1530.3,475.1 1268.7,473.8 1030.5,476.7 207.3,478.6 28.0,481.9 28.7,822.2 36.7,1479.7 36.8,1481.5 1.0,1481.6 1.0,1504.6 99.4,1506.8 267.9,1500.3 293.4,1492.0 423.2,1496.8 463.0,1491.6 534.2,1509.5 769.6,1496.8 970.2,1499.3 1031.9,1488.8 1236.5,1486.2 1237.6,1494.5 1476.2,1493.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1034.0,487.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14735800205744,38.70023654464239]}},{"type":"Feature","properties":{"resourceCoords":[46.0,487.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14895414129406,38.70148779923979]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p17a","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017a","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1559.8,1007.5 1563.3,1481.0 1301.6,1477.3 1063.4,1478.1 240.1,1472.6 60.7,1474.3 58.6,1146.9 61.0,474.6 795.6,477.1 1062.0,481.6 1118.9,478.9 1560.1,480.8 1559.8,1007.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0017a/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[561.0,485.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14656898592153,38.70214736854863]}},{"type":"Feature","properties":{"resourceCoords":[1562.0,1475.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14652949549101,38.699632166720434]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0018","type":"ImageService3","width":1603,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"303.4,1537.3 303.3,1503.3 303.2,1490.2 300.7,975.1 295.0,514.1 292.8,23.4 308.0,28.0 390.0,28.0 505.0,18.0 705.0,20.0 710.8,9.1 715.0,8.0 715.0,1.1 795.1,1.1 796.0,17.0 980.0,14.0 982.0,18.0 1117.0,20.0 1260.8,13.0 1260.5,723.5 1260.3,975.8 1201.0,975.7 1602.0,1225.2 1602.0,1936.0 1241.0,1936.0 1046.0,1931.0 858.0,1936.0 857.0,1948.0 660.9,1948.0 303.8,1599.2 303.4,1537.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[782.0,958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14570717518839,38.699021722153674]}},{"type":"Feature","properties":{"resourceCoords":[1266.0,958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14490117478208,38.69839471915519]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0019","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1565.8,1222.0 1571.5,1624.7 1578.0,1917.9 58.5,1889.2 49.7,528.2 65.0,528.0 64.0,480.0 49.4,480.3 47.9,259.6 92.0,78.2 265.2,31.9 1554.5,76.0 1565.8,1222.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1057.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16559736085794,38.70355205294042]}},{"type":"Feature","properties":{"resourceCoords":[1554.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16445863765301,38.70354625884505]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p20","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0020","type":"ImageService3","width":1603,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"790.3,23.1 1496.6,51.6 1497.2,46.6 1528.0,46.7 1532.5,383.4 1539.0,1212.0 1602.0,1211.6 1602.0,1225.3 1543.2,1226.2 1514.6,1858.2 1410.5,1806.4 1009.0,1807.1 600.4,1919.3 53.1,1906.3 48.1,1617.3 44.4,1220.5 38.7,91.0 790.3,23.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[537.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.163299,38.703587]}},{"type":"Feature","properties":{"resourceCoords":[1539.0,1212.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1609742,38.7014737]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p22","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.44"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0022","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"413.9,1885.1 414.2,1854.3 751.1,1852.6 1580.0,1853.0 1580.1,1790.1 1593.8,1789.2 1586.1,831.5 1506.5,181.6 1006.0,8.7 1006.0,9.0 1000.0,15.0 981.0,15.0 980.1,1.0 943.9,1.0 943.0,11.0 927.0,11.0 926.1,1.0 918.9,1.0 918.0,14.0 888.0,19.0 488.0,21.0 322.0,32.0 283.0,17.0 212.0,18.0 96.0,29.0 93.0,41.0 4.0,41.0 1.0,35.7 1.0,394.1 56.6,405.6 133.5,1156.1 54.6,1838.8 413.9,1885.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15668532107888,38.70436136301116]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15666068375864,38.70144321256262]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16119720706888,38.70141995899513]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16122184438912,38.70433810944367]}},{"type":"Feature","properties":{"resourceCoords":[1580.0,1853.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1609742,38.7014737]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p24","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0024","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"20.4,288.2 53.4,314.0 40.8,1186.4 123.2,1451.4 1.0,1788.6 1.0,1789.3 469.0,1838.5 469.0,1844.0 1458.0,1844.0 1455.7,1720.7 1459.5,1595.6 1459.5,1347.4 1451.5,1347.5 1392.2,472.0 1386.8,225.8 1392.3,13.9 1235.0,17.0 1169.0,14.0 1121.0,19.0 851.0,16.0 712.0,22.0 572.5,21.3 20.4,288.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[469.0,1844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.153794,38.700236]}},{"type":"Feature","properties":{"resourceCoords":[1458.0,1844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.152191,38.701508]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0025","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"105.8,13.6 113.5,974.1 108.0,974.2 63.0,1437.3 83.5,1444.5 67.7,1878.2 154.2,1923.5 347.7,1928.6 372.0,1926.0 372.2,1928.0 374.5,1927.9 375.0,1926.0 444.0,1926.0 545.5,1932.0 563.0,1932.0 563.2,1933.0 569.9,1933.5 570.0,1933.0 586.0,1933.0 588.4,1934.5 598.4,1935.1 599.0,1930.0 658.0,1926.0 819.0,1926.0 969.0,1932.0 1172.0,1928.0 1354.0,1938.0 1354.2,1939.2 1372.8,1940.3 1373.0,1939.0 1416.0,1939.0 1416.5,1943.0 1498.0,1948.0 1499.0,1939.0 1553.0,1938.0 1581.4,1934.6 1572.8,973.3 1571.5,738.5 1567.6,17.8 1498.0,11.0 1459.0,16.0 1332.0,11.0 1307.0,19.0 1142.0,25.0 902.0,19.0 747.0,20.0 718.0,17.0 717.0,1.0 716.9,1.0 715.0,17.0 689.0,17.0 687.1,1.0 660.9,1.0 660.0,15.0 352.0,11.0 163.0,18.0 105.8,13.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[596.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15299206391018,38.69961612823227]}},{"type":"Feature","properties":{"resourceCoords":[1090.0,1902.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15371240427062,38.69777778067463]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0026","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"317.4,1929.8 309.0,974.0 307.8,740.8 304.0,35.8 533.0,24.0 728.0,27.0 758.0,22.0 787.0,22.0 788.0,17.0 987.0,15.0 988.0,23.0 1220.0,23.0 1364.0,16.0 1491.2,16.5 1494.0,20.0 1563.0,22.0 1608.0,17.0 1608.0,964.0 1598.0,965.0 1599.0,998.0 1608.0,999.0 1608.0,1879.9 1429.7,1878.2 1360.8,1930.2 1253.0,1933.0 1043.0,1928.0 827.0,1936.0 682.0,1931.0 458.0,1935.0 317.4,1929.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[794.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15057,38.697724]}},{"type":"Feature","properties":{"resourceCoords":[309.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.151378,38.698354]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0028__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p28 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6436.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0028__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0028","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"763.0,1934.2 791.3,1934.2 816.9,1714.8 816.6,1520.8 889.0,1427.3 889.0,1384.0 922.5,1384.0 1017.5,1261.2 1063.7,1261.1 1063.8,1331.0 1312.5,1325.6 1312.5,1332.0 1562.8,1288.8 1562.1,952.6 1574.8,952.7 1577.5,183.3 1559.8,183.4 1559.6,143.8 1585.9,143.9 1584.9,45.6 1520.5,106.3 1267.3,59.8 960.4,71.7 906.9,108.8 808.3,79.0 720.1,102.6 536.1,88.4 426.6,111.9 351.6,164.9 290.5,119.3 82.4,107.6 27.3,502.2 60.9,1356.2 43.6,1649.6 72.8,1684.5 85.2,1890.0 125.3,1866.1 175.9,1901.0 413.2,1920.8 746.8,1909.0 763.0,1934.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0028__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1063.0,951.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.139286,38.712973]}},{"type":"Feature","properties":{"resourceCoords":[1311.0,951.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138479,38.712349]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p2 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2347.2"},{"label":"split_canvas_w","value":"6400.0"},{"label":"split_canvas_h","value":"5448.8"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0002","type":"ImageService3","width":1600,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1599.0,882.3 1496.0,778.7 1170.5,903.7 198.1,890.9 198.1,891.5 55.1,891.9 54.2,1382.7 51.7,1872.7 1412.0,1868.1 1413.0,1149.8 1418.1,887.6 1599.0,887.4 1599.0,882.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1412.0,1376.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.145354,38.708181]}},{"type":"Feature","properties":{"resourceCoords":[1412.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.144541,38.70755]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p3","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0003","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"122.3,51.7 1404.5,43.3 1402.4,508.2 1403.5,1899.7 156.8,1902.5 121.2,1905.9 124.4,1657.8 124.0,974.0 122.3,51.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[124.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.147367,38.702788]}},{"type":"Feature","properties":{"resourceCoords":[124.0,1438.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.146558,38.70216]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0031__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p31 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6476.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0031__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0031","type":"ImageService3","width":1619,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"127.4,55.8 150.8,68.3 65.7,130.8 88.3,1092.1 859.4,1078.3 1011.1,1232.9 968.0,1327.5 1033.4,1671.4 995.9,1729.1 1064.7,1713.9 1142.9,1815.0 1507.2,1823.7 1562.1,1879.6 1565.8,1096.3 1569.4,138.1 1570.4,98.3 1569.5,98.3 1569.5,94.6 1569.5,80.0 1485.2,92.8 1155.9,69.6 950.7,71.8 799.2,64.3 636.5,62.9 576.2,71.5 420.2,60.9 322.9,62.6 127.4,55.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0031__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[585.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1545797,38.6983473]}},{"type":"Feature","properties":{"resourceCoords":[1566.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.154551,38.69584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0032__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p32 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6456.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0032__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0032","type":"ImageService3","width":1614,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1500.8,1882.7 1500.9,1846.1 1558.5,1846.5 1575.3,1352.3 1577.3,1352.3 1576.7,884.0 1560.0,885.0 1558.0,871.0 1560.0,836.0 1575.5,835.4 1576.7,612.4 1571.7,615.5 1005.9,583.3 1004.4,577.4 997.8,577.4 997.8,551.3 880.5,87.0 51.6,140.2 60.3,1828.6 551.1,1899.2 1500.8,1882.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0032__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[424.0,1352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155334,38.712053]}},{"type":"Feature","properties":{"resourceCoords":[922.0,1352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155345,38.711162]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p33","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.58"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0033","type":"ImageService3","width":1619,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"146.2,353.5 231.9,157.0 493.9,147.0 685.4,288.1 902.1,121.8 1254.8,101.8 1302.7,53.9 1560.2,52.8 1569.7,536.2 1565.7,995.3 1537.2,996.3 1535.1,1220.0 1618.0,1583.5 1618.0,1926.0 1464.0,1935.0 1343.0,1934.0 1195.0,1923.0 1095.0,1925.0 1046.0,1931.0 834.7,1925.0 540.9,1455.5 53.8,674.5 15.8,697.8 12.6,632.0 13.0,632.0 13.0,616.0 11.8,615.9 11.2,602.1 13.0,602.0 13.0,584.0 10.2,583.6 9.0,557.6 9.0,541.0 8.2,540.9 6.2,500.8 146.2,353.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1146.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155311,38.693925]}},{"type":"Feature","properties":{"resourceCoords":[1284.0,1031.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.154239,38.693458]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0034","type":"ImageService3","width":1614,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"29.6,547.5 30.0,1030.7 1.0,1032.0 1.0,1271.7 92.0,1653.9 94.5,1921.6 108.0,1921.0 251.0,1927.0 313.0,1925.0 326.0,1933.0 412.0,1938.0 429.0,1932.0 580.0,1926.0 726.0,1927.0 789.0,1932.0 898.0,1930.0 963.0,1934.0 965.0,1929.0 1119.0,1926.0 1222.0,1930.0 1226.0,1936.0 1272.0,1937.0 1273.0,1933.0 1419.0,1935.0 1431.0,1929.0 1613.0,1932.0 1613.0,1151.0 1560.2,1082.4 1556.2,972.2 1559.2,757.6 1548.9,537.0 1552.5,388.8 1546.2,159.9 1550.0,17.1 1541.0,17.2 1532.7,17.4 1493.0,18.0 1492.8,17.1 530.5,31.5 140.7,37.9 106.0,40.0 14.8,40.0 29.6,547.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1528.0,1020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15137078736052,38.69578403187372]}},{"type":"Feature","properties":{"resourceCoords":[1528.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15294469831255,38.69703549106188]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p35","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0035","type":"ImageService3","width":1619,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"150.2,157.5 155.1,317.6 94.4,317.8 99.0,786.0 95.3,1785.8 1.0,1785.6 1.0,1796.6 95.3,1796.9 95.3,1828.3 211.9,1934.7 277.0,1933.0 314.0,1927.0 567.0,1934.0 781.0,1923.0 875.0,1924.0 963.0,1932.0 1203.0,1928.0 1258.0,1932.0 1266.0,1940.0 1266.0,1948.0 1316.0,1948.0 1321.0,1934.0 1481.0,1938.0 1489.0,1934.0 1592.6,1926.0 1589.8,1798.1 1597.3,1798.1 1599.7,1281.0 1588.0,1281.0 1599.1,786.4 1597.1,786.4 1589.9,330.6 1264.5,301.9 1219.0,204.9 1109.6,230.2 1004.2,139.4 815.7,121.5 829.7,49.1 664.8,33.5 181.4,68.5 150.2,157.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[99.0,786.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157474,38.686807]}},{"type":"Feature","properties":{"resourceCoords":[1192.0,1798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.154628,38.688316]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p36","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0036","type":"ImageService3","width":1614,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"53.8,392.2 243.5,318.1 834.0,290.0 1271.6,128.6 1517.0,164.2 1592.9,144.8 1491.8,324.9 1538.4,325.3 1536.2,1289.0 1535.7,1898.5 1583.0,1929.0 1351.0,1929.0 1274.0,1932.0 1268.0,1938.0 1244.0,1938.0 1191.0,1930.0 1041.0,1925.0 964.0,1928.0 963.0,1934.0 669.0,1926.0 431.0,1931.0 300.0,1922.0 107.0,1918.0 21.1,1922.8 18.5,1797.9 26.0,1797.9 29.5,1282.2 17.8,1282.2 29.9,789.2 27.9,789.2 21.6,334.6 53.8,392.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[541.0,1284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155311,38.690143]}},{"type":"Feature","properties":{"resourceCoords":[1536.0,1801.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.153629,38.691688]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p37","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0037","type":"ImageService3","width":1619,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1118.3,1770.0 1618.0,1771.9 1618.0,135.1 625.0,133.0 159.5,138.3 159.2,78.0 1.0,79.6 1.0,83.4 62.1,108.8 121.2,362.3 56.9,873.8 138.5,1290.1 96.4,1437.4 133.7,1696.1 94.0,1704.2 163.1,1733.9 163.0,1771.0 425.1,1773.1 1118.3,1770.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[625.0,133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157474,38.686807]}},{"type":"Feature","properties":{"resourceCoords":[163.0,1771.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.159382,38.684104]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0038","type":"ImageService3","width":1614,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"480.2,1768.2 1565.5,1766.3 1613.0,1768.5 1613.0,1552.5 1393.5,716.2 1338.2,505.8 1225.1,75.6 1149.5,16.3 1101.0,16.0 1074.0,20.0 1071.0,16.0 987.0,12.0 721.0,16.0 720.0,25.0 649.0,24.0 648.0,16.0 643.0,16.0 642.0,24.0 582.0,24.0 578.0,16.0 577.0,24.0 443.0,31.0 309.0,28.0 125.9,38.3 16.8,158.8 1.0,158.8 1.0,1766.6 233.6,1767.4 480.2,1768.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[475.0,1227.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15465315426314,38.68426387918017]}},{"type":"Feature","properties":{"resourceCoords":[1242.0,133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15229531199226,38.68590622274282]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0039","type":"ImageService3","width":1615,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"984.4,1905.2 1430.0,1909.0 1614.0,1910.6 1614.0,254.7 1501.9,254.8 1419.3,166.6 1377.6,122.5 801.0,163.5 785.9,139.5 792.6,133.5 1.0,185.8 1.0,226.1 23.9,226.8 23.6,268.1 1.0,291.9 1.0,991.0 55.0,993.0 57.0,1029.0 40.0,1031.0 39.0,1040.0 1.0,1040.0 1.0,1913.0 10.0,1913.0 24.0,1927.0 192.0,1928.0 196.0,1933.0 248.0,1933.0 310.0,1925.0 360.0,1925.0 514.0,1935.0 658.0,1930.0 661.0,1934.0 719.0,1927.0 846.0,1925.0 947.4,1932.7 984.4,1905.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[831.0,779.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14965839952218,38.68637172709028]}},{"type":"Feature","properties":{"resourceCoords":[831.0,1904.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15231314441806,38.68629920386997]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p4","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0004","type":"ImageService3","width":1600,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1356.5,36.6 1350.5,1432.8 1347.7,1665.2 1349.7,1895.3 61.4,1898.3 62.5,504.6 65.4,39.0 1356.5,36.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[62.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.145155,38.704532]}},{"type":"Feature","properties":{"resourceCoords":[62.0,1432.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.144346,38.703906]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p40","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0040","type":"ImageService3","width":1620,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"24.0,1894.0 875.4,1889.8 1045.0,1932.5 1051.2,1932.5 1084.3,1933.1 1100.2,1881.2 1326.8,1885.4 1579.2,1886.3 1579.8,1683.0 1570.9,452.8 1573.7,106.9 1505.5,35.9 648.5,32.0 650.5,261.1 441.9,260.0 317.1,117.2 1.0,220.2 1.0,1894.2 24.0,1894.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1575.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.150205,38.681919]}},{"type":"Feature","properties":{"resourceCoords":[24.0,1894.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.152262,38.684794]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p41","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0041","type":"ImageService3","width":1615,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"102.6,562.7 34.0,562.9 34.2,561.9 145.4,150.2 106.3,113.4 336.6,66.5 405.7,96.3 405.6,133.4 668.0,135.7 1361.7,133.0 1360.6,1797.1 665.4,1800.5 401.1,1796.1 402.8,1929.1 339.0,1924.0 276.0,1931.0 192.0,1933.0 185.0,1927.0 125.6,1927.0 102.6,562.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1361.0,1256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157811,38.681731]}},{"type":"Feature","properties":{"resourceCoords":[1361.0,694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.157516,38.682723]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p42","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0042","type":"ImageService3","width":1620,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"295.0,1806.0 284.2,136.0 787.0,134.6 786.3,16.1 793.5,16.2 793.8,134.6 1047.9,134.3 1300.0,134.0 1308.3,1804.6 401.8,1805.8 295.0,1806.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[295.0,1806.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.158096,38.680776]}},{"type":"Feature","properties":{"resourceCoords":[1300.0,134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.154934,38.683289]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p43","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0043","type":"ImageService3","width":1615,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.2,1149.0 54.0,1149.0 55.0,1101.0 49.2,1100.9 49.5,129.4 1163.9,128.4 1213.7,130.8 1213.7,91.3 1223.2,131.2 1279.7,133.8 1334.2,363.8 1398.7,618.9 1614.0,1455.2 1614.0,1658.8 1151.0,1778.0 1053.7,1794.5 897.3,1804.3 49.0,1807.0 49.2,1149.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[49.0,691.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15523,38.682306]}},{"type":"Feature","properties":{"resourceCoords":[49.0,1807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.155816,38.680352]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0044__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p44 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6472.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0044__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0044","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1596.5,1050.7 1585.4,1050.4 1596.0,66.9 1552.1,35.9 84.2,35.0 37.9,93.5 13.8,68.0 9.2,426.2 12.0,1700.0 10.4,1910.5 871.8,1913.8 952.4,1934.9 992.0,1934.0 1063.7,1935.7 1063.7,1914.5 1068.1,1257.0 1067.0,1066.4 1596.3,1062.1 1596.5,1050.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0044__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[538.0,218.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14820843971798,38.6810035179267]}},{"type":"Feature","properties":{"resourceCoords":[538.0,1897.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15210201205919,38.680924541215504]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0045","type":"ImageService3","width":1611,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1605.5,1718.1 1606.9,1172.8 1601.5,1172.9 1599.3,625.6 1605.3,625.5 1591.5,74.5 1172.5,77.8 1065.7,78.6 367.7,91.4 102.2,90.5 106.2,244.1 1.0,245.5 1.0,306.4 107.8,303.7 116.5,643.1 112.8,1185.5 117.8,1732.2 536.2,1732.3 1326.0,1721.8 1605.5,1718.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1078.0,630.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1583732766205,38.679804519207764]}},{"type":"Feature","properties":{"resourceCoords":[119.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16021822141319,38.68119276463274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0046","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1557.0,1870.4 1452.6,1917.8 983.4,1919.5 732.5,1801.0 557.3,1841.9 556.1,1934.0 520.6,1934.6 519.3,1740.8 47.1,1740.7 22.6,1740.7 30.8,1194.0 25.4,1194.0 30.0,645.2 36.0,645.2 29.1,92.6 518.4,94.9 1366.0,93.0 1522.3,83.3 1524.4,632.8 1522.1,1718.4 1529.1,1738.0 1574.2,1727.5 1557.0,1870.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[520.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.156388,38.678425]}},{"type":"Feature","properties":{"resourceCoords":[520.0,644.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1561,38.679389]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0047","type":"ImageService3","width":1611,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"26.3,1411.5 27.2,1263.0 57.0,1264.0 58.0,1238.0 50.9,1235.9 46.0,1213.0 27.5,1213.4 29.5,888.8 35.4,234.4 34.6,44.7 561.4,41.6 561.6,30.2 1588.1,59.2 1574.3,1861.4 1603.3,1872.9 1602.0,1918.7 1581.5,1920.5 543.7,1645.0 17.6,1508.7 26.3,1411.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1096.0,1791.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15414296004431,38.67798588604532]}},{"type":"Feature","properties":{"resourceCoords":[560.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15010315024904,38.67905056065904]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p48","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.46"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0048","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1552.6,44.2 1547.5,433.2 1548.1,1167.6 1548.2,1450.2 1548.0,1888.0 1368.3,1889.2 1354.9,1922.0 208.7,1906.7 58.0,1841.8 55.6,86.5 1067.2,10.8 1067.7,37.4 1552.6,44.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1548.0,946.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.158957,38.677882]}},{"type":"Feature","properties":{"resourceCoords":[1548.0,1888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.156676,38.677467]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0049","type":"ImageService3","width":1606,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1589.2,844.2 1597.9,1213.7 1604.8,1697.9 1605.0,1887.8 1352.2,1891.2 557.6,1902.8 58.6,1903.5 23.1,1853.7 20.8,1313.6 36.0,1314.0 35.0,1268.0 20.6,1267.6 16.8,350.1 59.0,62.6 1541.3,40.3 1586.6,173.1 1491.7,283.5 1490.7,463.3 1568.0,507.1 1599.5,842.8 1589.2,844.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[897.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.17046075838095,38.68128824330201]}},{"type":"Feature","properties":{"resourceCoords":[42.0,1900.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16753611681997,38.678857893414474]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p5","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0005","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.7,270.6 132.0,214.0 170.1,210.6 1501.6,212.1 1497.8,1579.8 1540.2,1629.0 1592.5,1667.0 1612.0,1691.5 1497.5,1691.9 1127.7,1695.2 737.8,1696.7 128.0,1698.0 116.8,1697.9 110.2,1551.0 117.0,1411.2 114.8,1223.2 131.0,1222.3 131.3,1140.6 112.2,1130.3 115.1,926.0 105.4,808.5 105.8,724.8 133.1,709.2 134.7,270.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1500.0,707.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142726,38.702649]}},{"type":"Feature","properties":{"resourceCoords":[132.0,214.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.145747,38.701523]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0050","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"14.8,151.0 122.9,76.7 764.9,16.8 1020.0,35.7 1106.2,133.1 1125.2,72.0 1275.2,54.5 1307.3,177.3 1234.4,240.2 1322.0,509.6 1406.1,552.8 1581.8,997.2 1556.8,1612.5 1062.4,1650.4 1062.0,1930.7 990.0,1929.0 936.2,1932.3 778.5,1931.3 771.0,1931.0 753.8,1931.2 538.9,1930.0 361.8,1929.1 265.0,1923.0 113.0,1921.0 7.4,1925.0 6.7,1162.5 6.0,970.9 5.2,482.4 1.0,109.6 11.3,108.3 14.8,151.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16894736967795,38.68221702160545]}},{"type":"Feature","properties":{"resourceCoords":[1618.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16778678619491,38.685021856263084]}},{"type":"Feature","properties":{"resourceCoords":[1618.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16348896996429,38.68392284421696]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.16464955344733,38.68111800955933]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p51","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0051","type":"ImageService3","width":1606,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.6,297.1 883.9,296.4 884.1,61.8 1433.3,55.2 1457.9,290.2 1485.0,552.3 1498.5,830.7 1537.5,900.7 1551.6,1103.8 1560.2,1374.2 1576.3,1633.8 1603.0,1910.0 1430.5,1910.2 1431.3,1917.6 116.2,1876.1 102.8,1885.5 108.5,1373.8 106.8,559.1 106.6,297.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.0,833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.165073,38.680234]}},{"type":"Feature","properties":{"resourceCoords":[107.0,833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.166759,38.680665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0052","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"403.9,1899.8 1408.6,1907.3 1410.4,1935.7 1438.8,1935.4 1452.8,1417.8 1461.7,875.2 1479.2,337.1 1479.2,10.2 1209.0,13.0 1208.0,9.0 1199.0,8.0 1199.0,1.0 1184.4,1.0 1175.6,5.2 1175.0,12.0 1162.0,11.9 1164.7,30.3 185.2,43.4 186.1,261.3 186.8,519.6 172.5,792.5 203.7,864.6 197.5,1064.2 179.3,1328.8 169.5,1583.7 168.3,1855.7 1.0,1839.0 1.0,1846.4 403.9,1899.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1449.0,855.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16086581463676,38.67928877004758]}},{"type":"Feature","properties":{"resourceCoords":[1449.0,1407.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16114130246773,38.678308652563096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.31"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0053","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"68.7,816.3 112.4,262.3 423.4,290.9 832.4,328.8 962.2,338.4 988.7,51.4 1501.5,56.9 1495.6,101.8 1578.7,224.1 1599.1,518.0 1554.8,1762.0 1600.0,1774.3 1600.0,1792.1 1600.0,1844.9 117.6,1866.5 97.0,1823.9 77.8,1827.0 54.4,816.5 68.7,816.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[400.0,816.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1631617141716,38.681815781560005]}},{"type":"Feature","properties":{"resourceCoords":[400.0,282.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16433622237973,38.682026372380825]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0057","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1564.2,1889.8 1322.6,1888.8 1048.5,1897.1 1048.5,1910.0 280.2,1882.9 329.4,1918.0 82.6,1862.9 40.9,1780.0 36.4,1525.2 61.0,1526.0 63.0,1478.0 35.5,1476.5 21.2,676.5 85.4,180.5 177.7,73.2 301.3,50.7 1511.5,32.6 1565.3,123.9 1521.8,264.9 1575.7,473.4 1555.5,1855.5 1564.0,1861.8 1564.2,1889.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-248.0,1522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16994411438449,38.675155119782474]}},{"type":"Feature","properties":{"resourceCoords":[1562.0,1875.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16821761562485,38.67207764414815]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0058","type":"ImageService3","width":1628,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1563.4,1284.3 1425.7,1186.7 886.1,1730.3 897.0,1768.5 760.2,1928.8 654.0,1927.0 653.0,1931.0 618.0,1931.0 617.0,1927.0 591.6,1927.7 198.1,1747.0 363.5,1431.0 306.1,1381.8 385.7,978.3 304.1,884.7 248.9,635.0 66.0,397.3 64.4,85.5 61.5,83.4 11.7,47.6 792.5,78.0 792.5,64.9 1071.2,57.5 1316.8,59.4 1316.7,30.9 1550.6,203.0 1574.0,1063.8 1586.0,1072.4 1563.4,1284.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1345.0,807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16961355346217,38.671250747060434]}},{"type":"Feature","properties":{"resourceCoords":[805.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.16893336108103,38.67280143944599]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p59","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0059","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"130.4,1906.2 56.8,1811.7 46.2,1586.0 55.0,1586.0 53.0,1541.0 44.1,1540.8 23.2,1096.0 62.0,270.4 134.1,109.2 301.7,27.9 601.5,69.8 1171.3,29.9 1529.8,108.0 1515.3,30.6 1540.6,46.3 1544.3,44.9 1601.0,130.0 1601.0,291.7 1601.0,397.9 1562.4,444.4 1517.2,534.6 1501.2,648.9 1504.0,912.0 1504.0,1884.0 1504.0,1900.3 757.6,1869.1 756.6,1875.4 391.7,1863.0 290.8,1850.7 250.7,1922.2 127.3,1921.2 130.4,1906.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1504.0,912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.172738,38.669517]}},{"type":"Feature","properties":{"resourceCoords":[1504.0,1884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.172752,38.667722]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p6","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0006","type":"ImageService3","width":1600,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"140.4,1670.9 88.2,1633.2 46.0,1584.4 46.4,223.6 1413.3,219.6 1412.4,713.1 1471.2,713.0 1435.3,746.9 1412.4,772.1 1412.2,884.0 1412.0,1697.4 257.4,1698.4 193.2,1695.1 140.4,1670.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[46.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.141918,38.702023]}},{"type":"Feature","properties":{"resourceCoords":[46.0,716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142726,38.702649]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0060","type":"ImageService3","width":1628,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.7,905.9 148.8,635.8 164.6,518.4 210.7,425.6 250.2,377.7 249.1,102.6 459.8,120.9 484.4,90.0 1237.8,213.4 1238.2,381.7 1423.3,277.4 1421.8,855.3 1513.3,1004.4 1501.5,1839.3 1245.8,1858.7 1245.9,1901.9 751.4,1901.8 156.7,1904.0 152.7,905.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[741.0,920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.17138318417604,38.66948100794802]}},{"type":"Feature","properties":{"resourceCoords":[154.0,1884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.17275769098488,38.667757974079855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0061","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"113.5,135.9 240.5,134.8 280.6,60.6 384.6,71.6 760.4,78.1 761.3,71.5 1525.3,90.8 1529.9,90.9 1533.8,328.6 1537.5,547.5 1538.0,574.0 1547.0,1090.0 1558.5,1579.2 1565.0,1579.1 1572.3,1855.3 1511.2,1908.7 781.3,1902.7 637.4,1860.8 590.1,1764.1 132.3,1812.1 35.8,543.4 108.0,164.6 113.5,135.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1522.0,1098.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.17282289780974,38.66588563507405]}},{"type":"Feature","properties":{"resourceCoords":[1522.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.17276981411109,38.667711792176576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p62","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0062","type":"ImageService3","width":1628,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1405.0,124.2 1324.8,369.7 1326.6,651.8 1387.4,866.7 1499.0,895.7 1493.1,1140.7 1434.1,1200.5 1473.9,1630.8 1192.6,1773.6 1104.2,1885.5 755.2,1880.3 732.5,1828.5 569.5,1874.0 524.5,1814.9 116.2,1825.0 88.7,1848.1 86.0,1575.3 79.6,1575.2 76.2,1092.0 75.5,582.5 75.4,340.2 75.3,88.9 664.0,89.0 1153.4,90.8 1153.5,48.1 1406.6,29.8 1405.0,124.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1152.0,1088.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.170261,38.665894]}},{"type":"Feature","properties":{"resourceCoords":[664.0,89.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.171382,38.667715]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p64","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0064","type":"ImageService3","width":1633,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"177.1,95.6 177.1,93.0 209.2,125.5 674.4,63.0 905.3,85.6 970.2,44.2 970.1,72.1 1186.0,97.8 1376.9,98.0 1468.8,169.4 1511.4,169.5 1511.3,202.5 1632.0,296.3 1632.0,331.9 1632.0,341.7 1563.2,341.7 1568.0,586.5 1561.7,586.5 1603.7,832.9 1632.0,832.9 1632.0,859.9 1632.0,880.6 1589.2,879.7 1589.5,869.1 1536.5,1076.9 1557.0,1076.9 1552.5,1322.6 1551.5,1322.7 1559.5,1567.9 1558.0,1567.9 1544.5,1812.8 1562.2,1812.8 1496.5,1925.7 1494.8,1925.7 1490.7,1925.8 1249.8,1816.4 1249.8,1812.9 539.8,1812.9 208.3,1812.5 74.1,1812.4 75.3,1567.0 74.5,1445.7 76.3,1323.1 81.5,586.5 83.4,226.7 86.5,95.3 177.1,95.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1256.0,587.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1407,38.710586]}},{"type":"Feature","properties":{"resourceCoords":[78.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142927,38.70629]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0065__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p65 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6408.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0065__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0065","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1601.0,1291.0 1601.0,1274.6 1564.3,1284.8 1578.1,302.1 1551.2,171.2 1470.7,102.4 1467.8,83.8 1310.0,83.3 1065.0,80.8 576.1,77.2 337.4,74.4 262.9,75.1 211.8,84.0 161.9,108.5 79.7,188.3 1.0,260.2 1.0,293.6 113.5,409.9 112.3,761.5 76.5,724.8 26.1,853.2 18.4,861.0 105.6,1104.4 103.1,1106.8 599.0,1617.6 830.1,1856.2 903.4,1931.9 928.0,1933.0 945.0,1932.5 985.2,1893.8 1277.0,1612.4 1573.3,1326.9 1577.7,1313.3 1601.0,1291.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0065__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[573.0,521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1338915733842,38.70578665253053]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13379061753709,38.702135304354]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0067__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p67 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6408.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0067__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0067","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1509.5,1483.5 1491.4,1458.3 1487.6,1454.6 1488.0,1294.8 1601.0,886.5 1601.0,846.7 1591.2,838.1 1599.7,405.9 1572.5,165.9 1601.0,140.7 1601.0,134.8 1601.0,119.0 1489.7,117.9 1243.5,118.0 749.9,114.3 500.0,115.0 500.5,67.2 454.9,137.1 468.4,159.9 467.4,286.4 459.1,336.4 371.5,422.7 247.8,398.1 237.1,424.3 100.0,423.2 80.7,536.4 35.7,578.6 36.4,675.6 10.4,675.5 10.5,714.6 27.9,714.6 22.9,1474.5 10.4,1474.4 10.1,1769.9 58.0,1774.0 57.0,1821.0 46.3,1820.6 254.9,1874.0 254.9,1853.4 501.5,1858.1 501.5,1859.2 747.6,1851.3 747.6,1852.8 993.4,1866.6 993.4,1848.8 1106.7,1914.9 1106.8,1920.7 1104.0,1926.8 1111.6,1926.7 1115.1,1926.6 1240.8,1869.7 1240.9,1921.0 1487.2,1669.4 1487.5,1506.1 1509.5,1483.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0067__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13354521191219,38.7124535874147]}},{"type":"Feature","properties":{"resourceCoords":[1237.0,705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1311097316998,38.71058200840613]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p69","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0069","type":"ImageService3","width":1598,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"190.8,1841.5 144.6,1913.5 93.8,1828.6 102.2,1420.6 24.1,1136.8 29.7,969.2 116.5,628.9 105.8,488.4 165.4,304.7 87.2,177.6 103.5,96.5 357.6,21.2 1054.7,49.0 1086.1,17.7 1190.2,20.7 1228.1,58.0 1221.7,65.8 1597.0,512.1 1597.0,514.0 1597.0,558.0 1567.6,584.7 1529.5,854.9 1553.7,1008.9 1526.6,1068.3 1567.0,1271.0 1563.8,1733.1 1531.3,1873.6 1344.8,1886.9 1319.8,1909.4 1319.6,1887.2 1205.5,1886.8 953.0,1888.6 446.9,1888.1 190.7,1890.5 190.8,1841.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[950.0,1192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.126962,38.713827]}},{"type":"Feature","properties":{"resourceCoords":[445.0,1192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.128579,38.715086]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p7","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0007","type":"ImageService3","width":1619,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1090.7,1845.6 1090.7,1863.0 605.6,1875.4 114.2,1879.5 113.3,1746.3 109.0,1383.0 108.2,1237.4 111.4,1174.0 110.0,33.7 925.4,33.9 950.2,20.4 1080.8,21.2 1397.4,192.4 1350.3,239.2 1364.9,557.5 1462.3,1084.6 1409.3,1355.7 1481.4,1637.6 1538.7,1663.8 1524.0,1887.2 1090.7,1845.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1089.0,1383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.139488,38.700139]}},{"type":"Feature","properties":{"resourceCoords":[109.0,1383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.141117,38.701402]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0070","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"793.8,1856.5 792.9,1855.7 708.1,1768.3 665.0,1724.2 79.4,1776.5 63.6,1752.4 77.6,1739.3 199.8,1630.6 417.5,1449.0 320.0,1338.8 331.0,1329.2 419.8,735.4 207.4,494.6 205.3,228.4 184.4,123.3 261.9,113.5 451.9,104.6 578.9,103.0 579.8,117.3 1219.3,158.0 1354.8,70.9 1532.6,126.0 1513.5,371.4 1603.4,774.5 1596.8,1608.9 1611.0,1608.9 1613.9,1845.9 1398.1,1845.7 1268.4,1698.4 940.8,1806.7 941.0,1853.7 793.8,1856.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[672.0,132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14436787662687,38.68544329422994]}},{"type":"Feature","properties":{"resourceCoords":[1592.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1482707460322,38.68372423783519]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p71","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0071","type":"ImageService3","width":1598,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"138.2,901.0 301.3,1066.7 351.8,1167.6 370.4,1270.8 373.0,1422.0 370.7,1906.2 1383.2,1908.0 1526.4,1909.1 1547.4,1423.1 1533.3,1423.0 1552.6,938.9 1548.0,938.8 1555.5,455.0 1562.8,455.0 1543.2,47.3 1042.5,46.0 1029.6,16.5 994.1,15.7 231.0,440.9 1.0,666.8 1.0,753.0 138.2,901.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[373.0,1422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.131842,38.706675]}},{"type":"Feature","properties":{"resourceCoords":[1386.0,938.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.129539,38.707566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0072__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p72 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.50"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6540.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0072__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0072","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1335.1,1828.5 1565.5,1672.9 1587.0,1258.4 1528.9,1062.0 1444.2,976.9 1439.6,552.4 1522.0,475.6 1477.0,414.5 1522.2,369.5 1525.2,138.7 1498.7,96.2 1276.0,37.4 952.2,79.3 214.7,56.8 203.0,45.1 185.9,83.2 199.8,83.2 176.2,147.8 170.7,216.7 188.2,578.4 171.9,578.5 137.2,600.3 1.0,600.0 1.0,1626.0 284.6,1626.0 286.5,1928.0 577.4,1930.6 1294.3,1821.1 1316.7,1798.0 1337.6,1776.4 1335.1,1828.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0072__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[670.0,83.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.139273,38.696489]}},{"type":"Feature","properties":{"resourceCoords":[419.0,83.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.140092,38.697126]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p73","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0073","type":"ImageService3","width":1598,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.9,1901.6 78.6,1413.2 64.4,1413.2 79.5,926.7 74.9,926.6 78.2,440.6 85.5,440.5 62.1,31.1 188.7,30.2 430.9,115.1 780.3,18.4 1530.8,60.6 1550.4,1843.4 1537.8,1896.0 1475.3,1894.3 640.2,1900.9 61.9,1901.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[929.0,436.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127228,38.70845]}},{"type":"Feature","properties":{"resourceCoords":[929.0,1898.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127209,38.70585]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p75 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.66"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4718.0"},{"label":"split_canvas_h","value":"3816.4"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075","type":"ImageService3","width":1590,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"58.2,786.1 226.2,899.2 228.2,922.7 377.0,904.9 379.6,933.5 395.9,947.4 1096.5,882.9 1129.8,712.2 1057.2,37.6 213.2,27.6 68.2,59.4 16.8,412.4 58.2,786.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[595.8,620.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12215837363941,38.73153954635084]}},{"type":"Feature","properties":{"resourceCoords":[1086.5,235.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11995502742492,38.73293348014954]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p75 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.17"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4412.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1947.6"},{"label":"split_canvas_h","value":"3776.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075","type":"ImageService3","width":1590,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1523.7,191.3 1520.9,164.5 1381.0,183.0 1378.9,160.9 1219.2,56.4 1221.0,70.5 1163.6,98.9 1172.3,611.1 1210.8,851.3 1522.2,870.5 1543.8,849.0 1566.5,551.8 1540.0,215.4 1523.7,191.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1411.0,510.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.123656,38.7292139]}},{"type":"Feature","properties":{"resourceCoords":[1381.0,183.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1238071,38.730445]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p75 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3763.2"},{"label":"split_canvas_w","value":"6360.0"},{"label":"split_canvas_h","value":"4032.8"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075","type":"ImageService3","width":1590,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"284.2,1929.7 284.6,1930.4 491.0,1935.0 491.9,1946.1 503.1,1946.1 504.0,1936.0 959.0,1933.0 1086.0,1926.0 1127.5,1926.0 1525.8,1836.5 1559.5,1772.6 1569.6,1430.7 1534.4,1013.9 1331.3,988.2 1290.1,1022.2 1075.8,1015.4 989.2,970.6 868.9,959.7 150.9,977.1 64.4,954.9 34.4,992.5 20.4,1311.8 41.0,1856.4 71.2,1878.9 284.2,1929.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0075__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[726.0,1347.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11010335447023,38.73346757690815]}},{"type":"Feature","properties":{"resourceCoords":[51.0,1091.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11320465407869,38.734394181655425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0076","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"123.6,284.6 135.1,193.9 191.9,167.6 407.4,134.1 747.5,150.1 1004.7,94.1 1325.9,98.7 1306.6,253.6 1355.6,321.8 1332.5,454.1 1287.1,499.3 1312.8,764.0 1358.0,862.4 1497.8,862.8 1505.3,896.8 1508.3,1165.2 1462.5,1373.1 1462.1,1524.3 1511.0,1600.0 1502.8,1834.4 1124.8,1856.1 1102.1,1890.1 947.1,1908.6 104.3,1898.8 74.2,1845.8 143.4,1381.0 91.4,1021.7 51.3,1019.7 83.5,987.6 133.9,413.1 144.0,412.1 143.6,359.5 73.0,284.5 123.6,284.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[399.0,1182.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.121272656158,38.713221981004736]}},{"type":"Feature","properties":{"resourceCoords":[399.0,662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12127879273518,38.71507746106309]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0077__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p77 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6360.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0077__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0077","type":"ImageService3","width":1590,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"166.2,1679.7 257.0,1788.6 312.2,1739.9 317.0,1745.4 614.1,1789.8 734.5,1683.6 867.8,1682.6 920.3,1672.2 925.2,1710.9 929.6,1806.0 930.4,1869.5 1061.2,1861.2 1106.7,1821.0 1158.6,1397.2 1531.9,1351.4 1561.8,1128.5 1527.3,751.6 1544.3,629.0 1551.8,622.5 1281.6,565.8 1320.5,531.6 1258.7,531.6 1078.3,394.8 1062.2,394.8 1062.1,382.4 582.1,18.1 457.0,16.0 420.0,20.0 349.0,17.0 1.0,26.0 1.0,282.5 2.0,539.0 68.0,538.0 69.0,581.0 1.0,583.0 1.0,1213.4 20.1,1213.0 33.0,1224.8 54.0,1224.6 54.1,1212.5 74.6,1212.1 108.4,1614.8 111.8,1618.5 166.2,1679.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0077__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[925.0,1678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.144344702913,38.68630611283029]}},{"type":"Feature","properties":{"resourceCoords":[220.0,532.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14770670505297,38.69041251301465]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p8","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0008","type":"ImageService3","width":1608,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1893.0 1.0,1893.2 52.0,1924.8 221.0,1921.0 342.0,1929.0 345.0,1936.0 346.0,1930.0 364.0,1930.0 365.0,1936.0 859.0,1938.0 989.0,1933.0 1127.9,1933.3 1142.7,1891.8 1187.5,1891.7 1173.1,1933.4 1245.8,1933.5 1449.4,1933.9 1517.3,1891.2 1549.2,1891.1 1514.4,1182.8 1525.2,1048.1 1571.2,921.5 1544.2,921.5 1577.6,846.9 1465.6,734.6 1491.7,667.1 1336.2,355.3 1450.7,189.2 1457.7,79.2 1026.0,38.8 1026.1,56.1 543.1,69.5 53.8,74.6 55.9,323.4 60.0,920.0 60.0,1641.0 60.0,1893.0 1.0,1893.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[60.0,920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.143323,38.699644]}},{"type":"Feature","properties":{"resourceCoords":[60.0,1893.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14494,38.698379]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Granite City, Illinois | 1950 | sanborn01898_002 p9","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T12:25:34Z","modified":"2026-10-18T12:25:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0009","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.0,1529.5 40.5,1043.1 40.9,292.8 50.0,293.0 49.0,244.0 40.9,243.8 41.0,73.0 1031.9,74.8 1560.3,78.8 1571.8,558.3 1568.5,558.3 1572.6,1046.7 1583.2,1046.7 1567.1,1537.4 1581.3,1841.2 1554.2,1893.4 1370.3,1839.0 977.5,1921.9 129.2,1828.3 40.3,1842.7 39.0,1529.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018981950:01898_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1028.0,1046.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.129489,38.70406]}},{"type":"Feature","properties":{"resourceCoords":[41.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.131831,38.70581]}}]}}]}