{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01838_007.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"East Saint Louis, 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":"138"},{"label":"placed","value":"99"},{"label":"unplaced","value":"39"},{"label":"fit sources","value":"georef 55, georef-snap 38, snap:0 4, snap:1 1, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"20 sheet(s) cut into 49 panels"},{"label":"unplaced pages","value":"p0__2 (tier 1, 38.63818,-90.15311 +/-103m); p101 (tier 3, 38.64384,-90.14893 +/-566m); p102 (tier 2, 38.64066,-90.14547 +/-100m); p103 (tier 3, 38.64119,-90.15159 +/-566m); p104 (tier 2, 38.63872,-90.14926 +/-171m); p105__1 (tier 2, 38.63489,-90.14663 +/-1774m); p105__2 (tier 1, 38.62986,-90.12971 +/-119m); p105__3 (tier 1, 38.63671,-90.15143 +/-116m); p107__1 (tier 3, 38.64557,-90.15157 +/-566m); p107__2 (tier 1, 38.64332,-90.15165 +/-100m); p108 (tier 3, 38.64290,-90.15498 +/-566m); p109 (tier 2, 38.63051,-90.12008 +/-100m); p112 (tier 1, 38.63768,-90.14181 +/-255m); p133 (tier 2, 38.63470,-90.14575 +/-152m); p135__1 (tier 1, 38.62936,-90.15527 +/-100m); p135__2 (tier 1, 38.62841,-90.15502 +/-100m); p140__2 (tier 1, 38.63213,-90.14107 +/-118m); p141__2 (tier 1, 38.62325,-90.14872 +/-100m); p151__3 (tier 2, 38.62238,-90.14587 +/-207m); p167__2 (tier 1, 38.61065,-90.13388 +/-254m); p184__2 (tier 2, 38.60901,-90.12652 +/-345m); p184__3 (tier 1, 38.61073,-90.12517 +/-116m); p187__2 (tier 1, 38.63727,-90.09304 +/-180m); p188__1 (tier 2, 38.60851,-90.11209 +/-100m); p188__3 (tier 1, 38.60773,-90.11020 +/-120m); p189__1 (tier 1, 38.62750,-90.12670 +/-117m); p189__3 (tier 1, 38.62740,-90.12631 +/-100m); p193__1 (tier 3, 38.64929,-90.14840 +/-566m); p193__2 (tier 3, 38.64929,-90.14840 +/-566m); p193__3 (tier 3, 38.64929,-90.14840 +/-566m); p196__1 (tier 1, 38.60726,-90.10411 +/-170m); p196__2 (tier 1, 38.60715,-90.09447 +/-190m); p196__3 (tier 1, 38.63958,-90.15457 +/-100m); p198__2 (tier 2, 38.63843,-90.11817 +/-4941m); p199 (tier 4, 38.62663,-90.13222 +/-4849m); p205__1 (tier 4, 38.62663,-90.13222 +/-4849m); p205__2 (tier 4, 38.62663,-90.13222 +/-4849m); p205__3 (tier 4, 38.62663,-90.13222 +/-4849m); p205__4 (tier 4, 38.62663,-90.13222 +/-4849m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p106","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.57"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0106","type":"ImageService3","width":1636,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1446.6,15.1 1520.3,556.3 1520.4,736.6 1539.6,736.6 1526.3,1964.2 1497.9,1964.5 1468.2,1964.8 1466.8,1941.0 524.1,1951.2 143.4,1858.5 57.1,1716.4 114.3,1239.8 51.5,1005.2 40.7,299.6 159.3,160.2 326.8,169.8 410.4,101.8 536.8,166.9 793.1,102.9 951.4,156.0 1173.2,39.4 1302.8,45.1 1328.6,17.2 1446.6,15.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0106/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15183834944008,38.63954292425535]}},{"type":"Feature","properties":{"resourceCoords":[1636.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14932066476464,38.637414571383566]}},{"type":"Feature","properties":{"resourceCoords":[1636.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15261208812176,38.63503232754021]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1551297727972,38.637160680411995]}},{"type":"Feature","properties":{"resourceCoords":[401.0,756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1524786,38.6381112]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p110","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.63"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0110","type":"ImageService3","width":1640,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1540.9,117.2 313.5,89.9 313.5,31.8 63.0,43.4 27.2,114.4 61.7,1541.0 1.0,1605.1 1.0,1658.3 327.0,1835.0 1497.3,1966.0 1529.6,1966.0 1529.8,1966.0 1531.5,1514.2 1573.6,1513.3 1572.0,1483.8 1543.6,985.8 1545.7,952.3 1535.9,851.5 1540.9,117.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0110/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15341212683923,38.63492652761264]}},{"type":"Feature","properties":{"resourceCoords":[1640.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15071356868687,38.6369249730938]}},{"type":"Feature","properties":{"resourceCoords":[1640.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14763058043931,38.63437781377821]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15032913859167,38.63237936829705]}},{"type":"Feature","properties":{"resourceCoords":[1541.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1507238,38.6366782]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p111","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.32"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0111","type":"ImageService3","width":1638,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"69.1,1042.2 114.0,1004.3 81.0,623.1 86.0,623.0 83.0,565.0 76.0,565.3 57.2,347.2 140.4,235.8 126.5,143.7 699.1,167.6 774.1,108.0 1064.5,158.4 1134.1,93.8 1283.4,93.2 1410.1,170.6 1559.0,159.6 1580.8,318.4 1515.7,367.4 1573.1,648.4 1496.1,785.3 1521.1,1026.5 1576.6,998.5 1611.9,1110.5 1626.2,1855.5 1473.2,1854.4 1467.6,1841.7 1312.5,1841.2 1057.0,1856.7 1055.3,1910.0 1006.8,1909.4 1005.0,1856.1 41.2,1902.5 69.1,1042.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[863.0,1865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.144279,38.639496]}},{"type":"Feature","properties":{"resourceCoords":[1592.0,1865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.143105,38.638504]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p113","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.46"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0113","type":"ImageService3","width":1638,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1594.0,1918.3 1594.0,1123.0 1586.2,370.6 1587.2,310.5 1587.4,286.4 1521.1,30.7 1372.0,29.0 1336.5,24.7 57.8,68.0 74.1,635.6 81.0,636.0 82.0,645.0 81.0,679.0 72.7,679.4 22.3,954.8 133.9,1385.4 25.2,1877.2 1.0,1877.2 1.0,1895.5 1594.0,1918.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0113/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1594.0,1123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.137024,38.635338]}},{"type":"Feature","properties":{"resourceCoords":[1594.0,1877.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138298,38.634415]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p114","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0114","type":"ImageService3","width":1640,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1566.0,692.0 1567.0,744.0 1602.6,741.7 1605.2,999.5 1598.1,1762.0 72.3,1767.7 66.2,998.5 52.0,231.0 822.0,234.3 1597.5,237.9 1602.1,691.5 1566.0,692.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0114/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[833.0,999.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.135857,38.634338]}},{"type":"Feature","properties":{"resourceCoords":[52.0,231.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.135765,38.6362694]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p115","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0115","type":"ImageService3","width":1638,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.2,745.2 85.0,746.0 86.6,724.6 90.5,722.1 85.1,271.8 1085.4,260.8 1228.8,247.4 1347.0,243.4 1529.5,249.3 1611.7,248.6 1611.8,255.1 1608.5,1009.8 1622.1,1784.5 856.5,1774.9 88.7,1784.8 94.2,1027.8 91.2,771.9 55.8,774.2 55.2,745.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0115/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13478305796143,38.63141960029456]}},{"type":"Feature","properties":{"resourceCoords":[90.0,259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13339390199815,38.63425587703271]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p116","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0116","type":"ImageService3","width":1642,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"130.9,1305.4 120.0,1307.0 58.9,976.6 54.0,862.8 58.5,780.1 48.4,149.0 830.2,134.1 1592.0,136.0 1591.2,754.9 1586.0,755.0 1585.0,762.0 1578.0,766.0 1580.0,812.0 1591.0,811.6 1590.7,1110.8 1592.0,1622.0 1119.1,1624.7 890.8,1630.3 830.3,1595.8 804.0,1607.1 558.5,1713.1 331.6,1811.1 130.9,1305.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1592.0,1622.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1288086,38.6303195]}},{"type":"Feature","properties":{"resourceCoords":[1592.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.131058,38.632259]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p117","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0117","type":"ImageService3","width":1638,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.6,1955.2 132.8,1871.4 60.8,1618.3 32.4,1607.8 46.1,882.8 156.6,701.6 156.6,183.6 431.7,187.9 972.2,38.5 1544.2,56.4 1566.2,29.2 1618.0,28.3 1637.0,46.5 1616.3,52.7 1592.0,827.6 1616.2,827.9 1634.2,1627.8 1637.0,1740.5 1637.0,1845.8 1637.0,1938.5 885.0,1946.7 133.6,1955.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[885.0,1925.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13456031396174,38.635288043049684]}},{"type":"Feature","properties":{"resourceCoords":[68.0,1925.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13581312310056,38.636394314039016]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p118","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0118","type":"ImageService3","width":1644,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1499.8,40.1 1523.9,16.4 1587.5,23.2 1587.0,39.9 1580.8,292.6 1577.9,823.7 1572.0,824.0 1570.0,854.0 1572.0,870.0 1577.7,870.0 1576.7,1085.8 1575.3,1398.8 1568.0,1959.6 1486.0,1959.0 1304.0,1950.0 1186.0,1952.0 1042.7,1962.9 766.6,1961.2 684.0,1960.0 683.0,1956.0 636.0,1960.0 631.0,1954.0 514.0,1954.0 513.0,1959.0 393.0,1959.0 392.0,1955.0 314.3,1958.5 44.5,1957.0 39.5,1956.9 46.3,1641.6 52.9,829.6 28.3,828.5 77.1,43.2 1499.8,40.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0118/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[813.0,834.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13035692457245,38.63462039523327]}},{"type":"Feature","properties":{"resourceCoords":[813.0,1938.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13219079663529,38.63327294607744]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p119","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0119","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1604.4,1212.2 1581.7,1192.1 1572.4,853.8 1588.7,833.4 1591.3,792.5 1288.2,236.8 582.3,1.0 65.2,1.0 66.2,21.0 67.0,287.0 79.0,811.1 72.0,841.2 80.0,856.8 85.0,1069.8 92.3,1378.6 100.8,1938.7 1052.0,1931.0 1520.0,1925.4 1564.4,1220.0 1604.4,1212.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0119/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1052.0,1931.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1295847,38.6309852]}},{"type":"Feature","properties":{"resourceCoords":[67.0,287.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.128258,38.634285]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p120","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.75"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0120","type":"ImageService3","width":1644,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"110.5,1942.5 931.5,1830.2 942.5,1867.5 1042.3,1779.0 1486.9,1838.2 1487.8,1491.1 1596.0,1382.2 1613.6,1199.5 1608.8,933.6 1568.0,931.0 1570.0,881.0 1607.9,882.0 1594.8,156.1 1461.3,78.2 1257.5,167.0 1199.2,96.2 1008.9,213.5 705.8,37.8 313.6,54.2 289.6,25.1 272.7,25.8 248.1,26.7 92.0,731.7 123.3,736.2 57.6,1203.0 30.1,1429.0 1.0,1466.3 1.0,1534.6 63.9,1768.8 110.5,1942.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,740.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12891584583195,38.63037972836349]}},{"type":"Feature","properties":{"resourceCoords":[116.0,1988.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13062158583854,38.62862105925242]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p121","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0121","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1564.0,45.5 1559.9,854.0 1570.4,853.9 1569.4,1397.8 1563.9,1945.6 1514.8,1944.7 145.5,1947.3 44.5,1898.2 16.0,1178.2 12.6,1019.7 18.4,936.2 67.0,934.0 69.0,892.0 67.0,883.0 21.9,884.4 75.9,100.6 64.9,76.5 1564.0,45.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[27.0,859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12393574260715,38.63817625628999]}},{"type":"Feature","properties":{"resourceCoords":[27.0,1395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12522843408864,38.638190841173824]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p122","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0122/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0122","type":"ImageService3","width":1644,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"876.0,1963.7 798.0,1963.0 691.0,1956.0 595.0,1959.0 594.0,1953.0 576.0,1953.0 575.0,1959.0 503.0,1959.0 502.0,1953.0 485.0,1953.0 484.0,1959.0 482.0,1953.0 406.3,1953.9 407.2,1825.3 82.5,1818.7 90.0,1236.0 92.6,657.5 81.4,657.5 85.9,84.3 413.1,98.9 413.0,75.0 1580.0,75.0 1576.1,660.7 1563.5,660.7 1525.8,1676.6 876.0,1963.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1580.0,75.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122696,38.632622]}},{"type":"Feature","properties":{"resourceCoords":[413.0,75.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122665,38.634689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p123 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.29"},{"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":"6536.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"828.8,1942.7 788.1,1671.9 903.1,1417.4 903.0,1405.2 908.6,1405.2 908.9,1404.6 1480.1,1309.7 1474.9,1178.6 1566.2,1161.9 1577.0,170.1 1511.2,52.8 1594.8,36.8 1595.9,33.2 1594.0,33.0 1592.8,20.4 1058.0,65.0 80.7,147.6 52.9,148.6 53.0,150.0 58.4,149.6 67.0,325.0 100.2,740.6 87.5,741.7 138.2,1768.8 167.2,1752.9 799.7,1912.2 828.8,1942.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1058.0,65.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122727,38.630856]}},{"type":"Feature","properties":{"resourceCoords":[53.0,150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122696,38.632622]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p123 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.03"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3612.0"},{"label":"split_canvas_y","value":"5594.0"},{"label":"split_canvas_w","value":"2924.0"},{"label":"split_canvas_h","value":"2322.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1603.8,1749.1 1469.3,1424.3 1209.8,1535.9 1007.4,1489.4 945.1,1916.3 1347.2,1954.2 1566.5,1909.2 1579.0,1742.3 1603.8,1749.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0123__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1489.2,1472.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122787,38.627716]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,1904.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122803,38.626739]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p124","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0124","type":"ImageService3","width":1652,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"984.2,1967.2 1246.0,1951.0 1426.0,1957.5 1425.5,1938.5 1578.1,1935.4 1575.6,1561.0 1537.6,115.1 1349.2,122.4 1172.1,46.0 532.5,139.1 59.6,240.7 36.6,620.0 101.2,920.3 1.0,928.5 1.0,1004.4 984.2,1967.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1561.0,1919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1266710888101,38.63476598988475]}},{"type":"Feature","properties":{"resourceCoords":[1561.0,75.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12650748346897,38.6380524448941]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p125","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0125","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"70.5,1929.4 28.7,1834.5 13.6,1069.7 45.0,1069.0 45.0,1042.0 41.0,1039.0 47.0,1035.0 47.0,1018.0 12.6,1017.3 11.8,982.4 55.2,47.1 236.3,99.5 1525.9,29.0 1586.3,66.6 1609.6,375.8 1617.5,375.6 1633.0,1266.3 1633.0,1288.3 1633.0,1621.9 1617.1,1621.8 1609.0,1916.7 70.5,1929.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[580.0,1623.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12135053031652,38.63717117269193]}},{"type":"Feature","properties":{"resourceCoords":[1533.0,1623.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12135503197237,38.63546672496632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p126","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0126","type":"ImageService3","width":1652,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"39.8,89.3 20.6,989.0 43.1,1927.0 88.8,1950.1 1410.6,1937.0 1489.8,1364.7 1587.8,1364.5 1574.8,798.4 1593.4,798.3 1592.3,53.8 1438.9,54.2 678.5,55.9 566.5,57.0 171.9,55.2 1.0,55.7 1.0,87.5 39.8,89.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0126/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[844.0,1369.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1145404402782,38.63438904101696]}},{"type":"Feature","properties":{"resourceCoords":[303.0,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.10860027477952,38.636323440166485]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p127","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0127","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.0,1084.9 55.8,986.5 56.0,250.0 232.3,250.6 761.6,180.5 760.1,65.1 847.2,146.5 1221.2,149.3 1302.8,225.5 1576.0,205.6 1623.7,250.1 1593.3,250.2 1586.8,1952.4 1582.0,1954.0 1556.0,1956.0 1486.0,1954.0 1243.0,1965.0 997.0,1967.0 983.0,1962.0 491.0,1960.0 342.0,1965.0 175.4,1961.8 114.2,1908.0 64.1,1117.9 66.0,1085.0 62.0,1084.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1216.0,1010.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14755340770013,38.637105723724474]}},{"type":"Feature","properties":{"resourceCoords":[1584.0,1762.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1457388313126,38.636564527576354]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p128","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0128","type":"ImageService3","width":1652,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1629.9,1146.4 1575.0,1149.0 1575.0,1199.0 1630.0,1200.0 1634.0,1294.0 1637.0,1294.5 1638.1,1310.1 1637.0,1319.0 1638.8,1319.1 1639.3,1326.8 1637.0,1327.0 1638.0,1439.0 1647.7,1439.8 1649.4,1463.1 1637.0,1464.0 1637.0,1500.0 1642.0,1501.0 1642.0,1524.0 1650.0,1524.9 1651.0,1623.0 1643.0,1623.0 1638.0,1629.0 1639.0,1786.8 1629.1,1787.1 1628.7,1751.6 1252.3,1758.6 852.2,1760.5 852.4,1772.2 59.8,1784.2 38.2,263.8 68.9,263.1 86.9,279.3 608.4,193.4 1327.9,235.3 1493.5,152.2 1568.9,153.7 1629.9,1146.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[71.0,1772.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1457379,38.6366032]}},{"type":"Feature","properties":{"resourceCoords":[835.0,245.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1467824,38.6395622]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p129","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0129/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0129","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"208.4,1699.5 203.7,251.2 352.2,219.3 592.9,270.1 1425.1,455.6 1432.0,447.2 1476.2,456.6 1495.8,1133.5 1491.9,1702.7 208.4,1699.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0129/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1495.0,588.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1528002633867,38.629840915251926]}},{"type":"Feature","properties":{"resourceCoords":[1495.0,1702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15108799083498,38.628391686628795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p130","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0130","type":"ImageService3","width":1652,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"340.2,559.4 390.2,35.2 1304.4,68.8 1299.0,227.1 1292.0,226.3 1305.5,887.6 1310.6,888.8 1303.7,1523.9 1303.0,1860.6 1303.0,1899.7 317.0,1910.3 321.9,1342.0 303.7,666.0 259.6,656.6 340.2,559.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[321.0,1342.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.151962,38.629131]}},{"type":"Feature","properties":{"resourceCoords":[1304.0,1342.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1503255,38.6303156]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p131","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0131","type":"ImageService3","width":1634,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"267.5,1930.9 267.2,1897.8 264.4,1562.4 264.8,929.5 259.8,928.4 239.4,269.6 246.4,270.3 250.2,112.6 628.7,122.6 986.8,201.8 1033.6,150.2 1034.7,201.5 1363.7,370.9 1396.8,373.9 1391.3,1166.8 1389.9,1166.5 1405.5,1919.8 1372.4,1920.1 1358.5,1917.1 1215.3,1921.7 1156.6,1923.6 743.4,1929.7 267.5,1936.8 267.5,1930.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0131/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[263.0,1339.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15038972404474,38.63037126970132]}},{"type":"Feature","properties":{"resourceCoords":[263.0,1928.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14948803127416,38.62959523234862]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p132","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.28"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0132","type":"ImageService3","width":1655,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1394.0,484.0 1426.6,483.8 1422.6,30.7 1464.9,29.5 1484.5,311.6 1568.0,384.6 1644.2,384.6 1645.0,425.0 1654.0,426.0 1654.0,687.0 1645.0,688.0 1644.0,738.0 1654.0,745.0 1644.0,746.0 1645.0,799.0 1654.0,800.0 1654.0,826.0 1645.0,827.0 1645.0,849.0 1654.0,850.0 1654.0,1247.0 1645.0,1248.0 1644.2,1278.8 1632.4,1287.8 1585.0,1291.0 1586.2,1322.9 1556.2,1345.7 1563.1,1445.5 1519.8,1445.2 1461.8,1644.8 1426.3,1956.6 1419.8,1956.5 1405.5,1956.3 1405.3,1927.4 956.7,1925.1 900.1,1939.8 862.0,1924.5 247.8,1921.3 238.2,1162.2 239.6,1162.5 251.7,363.9 1394.0,484.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0132/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.15092820733919,38.63316786090945]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14819686195735,38.635163867861216]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14516288289198,38.63259452724328]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14789422827383,38.630598520291514]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0134/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p134","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0134/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0134","type":"ImageService3","width":1655,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"44.5,1842.1 131.5,1962.9 200.0,1964.0 344.0,1951.0 434.0,1953.0 435.0,1965.0 546.0,1965.0 547.0,1949.0 632.0,1954.0 633.0,1966.0 825.4,1966.0 826.3,1889.8 844.2,1877.4 843.6,1787.3 1594.9,1702.7 1594.9,1711.9 1601.6,1711.8 1613.4,1711.7 1610.5,1414.6 1590.0,1415.0 1591.0,1364.0 1610.0,1363.4 1598.7,240.9 1611.5,240.6 1611.2,204.7 1231.0,210.7 826.9,211.4 827.0,223.2 26.4,233.0 28.9,453.2 1.0,479.3 1.0,1685.0 43.3,1738.7 44.5,1842.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0134/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[842.0,1757.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1420299161118,38.63553719731281]}},{"type":"Feature","properties":{"resourceCoords":[767.0,216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14451349865703,38.63748054148592]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0136/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p136","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0136/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0136","type":"ImageService3","width":1649,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1490.4,154.9 1489.7,707.7 1501.6,1272.9 1510.6,1273.0 1527.3,1829.3 1460.1,1830.5 1403.5,1831.6 235.2,1830.0 181.7,1826.2 130.6,523.7 202.1,174.1 201.9,155.9 1490.4,154.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0136/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1495.0,1277.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1493724219524,38.626933820275994]}},{"type":"Feature","properties":{"resourceCoords":[1495.0,152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.15108870398434,38.628396276846225]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0137/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p137","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0137/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0137","type":"ImageService3","width":1636,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"410.6,1837.2 136.7,1835.5 43.1,1837.0 32.5,1473.3 46.0,1473.0 46.0,1444.0 41.0,1442.0 46.0,1441.0 46.0,1422.0 31.0,1421.0 27.1,1285.4 18.1,1285.3 7.0,724.9 8.2,176.8 991.0,162.0 1467.0,157.8 1635.0,156.3 1635.0,387.0 1627.0,387.0 1626.0,393.0 1619.0,394.0 1621.0,425.0 1635.0,425.0 1635.0,1831.0 626.5,1836.9 501.0,1837.7 501.9,1961.9 478.0,1961.0 477.7,1966.5 475.5,1965.4 475.0,1961.0 467.0,1961.0 413.9,1845.8 410.6,1837.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0137/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[991.0,723.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1486028,38.6288543]}},{"type":"Feature","properties":{"resourceCoords":[991.0,162.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.149467,38.6295891]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0138/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p138","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0138/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0138","type":"ImageService3","width":1649,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"443.9,161.7 430.1,158.3 229.6,160.9 1.0,159.8 1.0,1822.1 417.2,1824.7 459.6,1824.9 458.9,1851.8 1639.0,1860.2 1643.2,1797.0 1640.0,1797.0 1638.0,1743.0 1638.0,1729.0 1638.0,1664.0 1630.0,1661.0 1630.0,1644.0 1640.0,1630.0 1648.0,1630.0 1648.0,1521.0 1639.0,1520.0 1639.0,1505.9 1635.3,1499.6 1629.0,1499.0 1629.0,1489.1 1624.1,1480.9 1622.9,1250.2 1648.0,1252.9 1648.0,1203.8 1630.8,1202.2 1622.7,1198.1 1620.2,724.3 1614.4,724.1 1616.4,284.8 1617.0,173.0 1175.0,168.7 1119.1,183.0 1081.8,167.8 443.9,161.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0138/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1600.0,714.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14483040837398,38.63163443985134]}},{"type":"Feature","properties":{"resourceCoords":[1600.0,1833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14306864494601,38.63017603748668]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0139/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p139","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.17"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0139/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0139","type":"ImageService3","width":1636,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.3,1940.5 66.3,1954.2 78.8,1760.6 1570.2,1778.2 1568.3,886.6 1635.0,841.6 1635.0,413.1 1567.2,317.1 1567.0,215.7 1525.0,161.5 1526.5,1.0 1398.9,1.0 1398.0,9.0 1257.0,12.0 1018.0,9.0 1017.1,1.0 807.9,1.0 807.0,9.0 767.0,10.0 551.0,9.0 550.1,1.0 128.7,1.0 72.7,194.5 38.1,498.0 17.9,497.8 18.5,580.1 19.2,674.2 21.5,1013.5 27.2,1013.6 34.9,1481.1 41.0,1482.0 41.1,1484.1 43.0,1485.0 68.0,1487.0 62.0,1535.0 35.8,1532.5 39.5,1760.1 63.5,1799.4 64.8,1906.9 55.3,1940.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0139/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[53.0,1014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1447358,38.6316772]}},{"type":"Feature","properties":{"resourceCoords":[1566.0,1788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14093,38.632507]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0140__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p140 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"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":"6596.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0140__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0140","type":"ImageService3","width":1649,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"49.2,1787.9 240.1,1786.3 438.1,1774.5 843.7,1778.2 933.1,1776.3 1585.0,1762.2 1583.5,1588.0 1579.0,1584.0 1579.0,1577.0 1571.0,1576.0 1573.0,1546.0 1583.2,1545.3 1571.0,134.1 817.6,227.3 819.2,317.8 801.3,330.3 801.3,906.5 801.3,906.5 29.5,906.5 49.2,1787.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0140__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[817.0,196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142029,38.63554]}},{"type":"Feature","properties":{"resourceCoords":[45.0,1798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14093,38.632507]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0141__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p141 [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":"6544.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0141__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0141","type":"ImageService3","width":1636,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.6,1549.5 62.3,1553.1 73.0,1554.0 73.0,1575.0 66.4,1575.4 66.8,1577.3 73.0,1578.0 72.0,1606.0 39.6,1606.0 89.1,1851.2 169.7,1897.7 1445.5,1907.7 1488.4,1827.2 1528.8,1821.2 1548.7,1876.3 1621.7,1613.8 1617.7,1613.9 1607.4,67.5 1081.3,75.1 923.5,11.4 703.0,17.0 693.8,16.8 587.3,270.8 528.5,420.9 507.9,473.4 61.6,1549.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0141__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1077.0,708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14773599150962,38.625301748380814]}},{"type":"Feature","properties":{"resourceCoords":[451.0,451.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14877378373394,38.62618232999118]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0142/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p142","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0142/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0142","type":"ImageService3","width":1649,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"536.2,1776.8 420.4,1779.4 316.5,1773.3 314.1,1781.8 310.1,1781.9 310.0,222.0 835.6,217.8 1349.5,215.6 1351.1,470.6 1354.1,1779.1 1071.0,1779.8 536.2,1776.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0142/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,1779.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1464134,38.6230626]}},{"type":"Feature","properties":{"resourceCoords":[310.0,222.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.146034,38.625931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0143/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p143","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0143/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0143","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1152.5,1767.3 1166.6,1801.8 1618.4,1803.9 1624.7,695.3 1625.0,138.3 1591.2,138.3 1146.4,138.4 1146.9,22.9 1136.0,22.6 1135.2,138.4 125.5,137.2 1.0,137.0 1.0,517.5 202.8,997.5 403.8,1475.3 598.6,1943.1 1039.1,1765.8 1152.5,1767.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0143/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[220.0,1004.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14599539160886,38.62594336755709]}},{"type":"Feature","properties":{"resourceCoords":[510.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14685945121963,38.627424293152394]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0144/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p144","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0144/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0144","type":"ImageService3","width":1649,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"221.8,151.7 221.3,178.9 1416.9,181.3 1415.1,719.1 1419.5,719.2 1413.3,1267.7 1409.0,1829.0 1355.4,1828.8 204.2,1823.3 211.8,710.7 212.8,151.7 221.8,151.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0144/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[208.0,1267.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14328,38.627323]}},{"type":"Feature","properties":{"resourceCoords":[1409.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.140419,38.628048]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0145/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p145","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.61"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0145/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0145","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1521.5,247.4 1524.5,297.4 1542.4,592.5 1566.0,982.0 1595.5,1627.5 824.1,1781.3 823.2,1759.9 57.3,1728.2 36.5,1200.7 32.1,1200.9 6.7,667.5 4.5,667.7 2.0,604.2 4.3,484.4 6.3,484.4 8.2,287.0 1521.5,247.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0145/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1566.0,982.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1397705,38.6315558]}},{"type":"Feature","properties":{"resourceCoords":[58.0,1745.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.141281,38.62878]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0146/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p146","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0146/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0146","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"44.0,980.6 28.4,300.0 27.3,250.3 415.0,232.2 814.9,241.2 903.0,240.5 1587.2,234.8 1595.3,1732.1 821.3,1746.9 83.7,1748.8 50.1,1756.5 44.0,980.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0146/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[823.0,984.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1384387,38.6324938]}},{"type":"Feature","properties":{"resourceCoords":[1591.0,984.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.137131,38.633423]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0147/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p147","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0147/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0147","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"81.1,1815.2 80.8,1789.5 80.1,1700.0 80.0,1681.2 79.4,1596.2 63.0,1590.4 56.6,1437.6 59.3,1133.0 50.0,973.4 51.2,806.9 44.7,779.4 72.8,779.0 67.0,242.0 66.9,225.8 803.5,280.3 803.6,301.0 1551.4,177.1 1553.2,307.7 1569.0,1259.1 1564.0,1763.0 1529.2,1769.2 1425.3,1768.9 1424.6,1763.2 1107.2,1763.0 1012.0,1762.2 719.2,1760.3 456.6,1765.8 350.1,1775.3 166.9,1802.0 81.1,1815.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0147/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1564.0,1763.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1362305,38.6285415]}},{"type":"Feature","properties":{"resourceCoords":[67.0,242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.141281,38.62878]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0148/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p148","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0148/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0148","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"48.2,234.3 49.6,1229.7 36.5,1756.7 1.0,1762.5 1.0,1762.6 828.1,1777.3 828.0,1758.0 1602.0,1764.7 1619.5,996.3 1617.5,225.4 831.4,232.5 82.3,226.9 48.2,234.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0148/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[828.0,993.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.136093,38.630486]}},{"type":"Feature","properties":{"resourceCoords":[828.0,1758.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1349135,38.6294932]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0149/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p149","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0149/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0149","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.2,362.2 48.2,137.6 1342.5,147.7 1594.7,148.6 1601.8,148.8 1620.9,160.0 1601.3,212.8 1594.8,224.1 1595.2,380.8 1595.1,589.9 1625.0,605.5 1625.0,656.3 1594.8,723.6 1593.3,1148.2 1598.0,1148.3 1613.3,1243.8 1593.3,1368.0 1593.1,1844.4 537.5,1833.4 81.8,1827.7 82.0,1817.0 34.9,1814.4 36.5,1574.0 42.0,1156.1 41.9,925.2 45.2,651.9 47.2,362.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0149/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[543.0,1842.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14137355834633,38.622253074265714]}},{"type":"Feature","properties":{"resourceCoords":[1579.0,149.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14392133717891,38.62515481347901]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p150 [1]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"24"},{"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":"6616.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1653.0,1397.9 1610.8,1287.6 1563.9,1131.7 1539.8,1034.2 1615.2,1001.6 1593.7,16.5 1445.3,22.6 1445.0,23.0 1412.0,24.0 1406.5,16.8 1394.0,16.0 1394.0,1.0 1359.8,1.0 1357.0,13.0 1339.0,13.0 1338.1,1.0 1261.4,1.0 1164.8,1.7 1164.0,9.0 1148.0,9.0 1147.2,1.9 1116.5,2.1 1112.0,19.0 1093.0,18.0 1093.0,2.3 1056.5,2.5 964.7,2.9 964.0,9.0 946.0,9.0 945.3,2.9 935.0,17.0 899.0,17.0 890.0,13.0 889.7,8.8 858.0,3.2 858.0,15.0 852.0,20.0 695.0,26.0 382.0,22.0 218.0,31.0 161.2,30.3 158.0,36.0 142.0,36.0 140.3,30.1 47.0,29.0 46.0,34.0 18.7,35.6 18.9,59.5 30.0,1191.0 33.8,1636.7 1.0,1650.6 1.0,1765.3 77.2,1947.5 584.5,1921.4 581.4,1966.8 698.4,1967.8 1071.3,1805.6 1071.3,1802.4 1079.5,1797.1 1159.4,1745.6 1279.2,1714.5 1653.0,1550.5 1653.0,1397.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1503.0,1050.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1399,38.624802]}},{"type":"Feature","properties":{"resourceCoords":[30.0,1191.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142425,38.626598]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p150 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.46"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4285.2"},{"label":"split_canvas_y","value":"6468.8"},{"label":"split_canvas_w","value":"2330.8"},{"label":"split_canvas_h","value":"1447.2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1322.2,1950.0 1334.9,1950.5 1653.0,1784.2 1653.0,1684.7 1172.7,1742.2 1171.5,1742.5 1152.3,1750.2 1152.0,1750.4 1253.2,1953.0 1264.2,1953.0 1267.2,1957.0 1322.2,1950.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0150__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1703.0,1758.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142876,38.624821]}},{"type":"Feature","properties":{"resourceCoords":[1269.2,1985.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1439075,38.6251805]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p151 [1]","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":"0.0"},{"label":"split_canvas_w","value":"6504.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1601.5,1583.0 1616.0,1507.1 1577.0,1490.2 1581.8,102.4 1346.2,100.1 1052.8,98.8 1056.1,212.0 540.2,270.2 541.7,96.7 6.0,89.5 47.4,101.8 71.0,868.5 673.2,1155.4 749.0,1493.1 846.0,1483.3 963.0,1574.3 1100.4,1504.0 1204.1,1584.2 1562.8,1498.9 1601.5,1583.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.0,689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14647234914838,38.62194136516872]}},{"type":"Feature","properties":{"resourceCoords":[1049.0,689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.14544856958734,38.621581696887326]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p151 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.24"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4380.0"},{"label":"split_canvas_w","value":"2592.8"},{"label":"split_canvas_h","value":"3536.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"107.4,1173.4 93.7,1344.3 608.9,1320.8 613.7,1209.0 388.3,1193.5 107.4,1173.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0151__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1095.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1461067951802,38.623087892530094]}},{"type":"Feature","properties":{"resourceCoords":[648.2,1095.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14473628526571,38.6226897733522]}},{"type":"Feature","properties":{"resourceCoords":[648.2,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14542657524117,38.62121875452224]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.14679708515567,38.621616873700134]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0152/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p152","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0152/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0152","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"149.1,1462.4 110.9,1445.8 119.3,83.7 159.7,84.2 389.3,84.2 804.7,89.9 1056.3,91.7 1502.0,96.1 1502.9,379.8 1495.1,1139.8 1501.0,1655.0 1495.5,1957.3 1457.2,1955.9 1442.0,1955.3 1433.4,1942.7 1200.7,1922.4 881.7,1783.2 493.9,1823.8 407.6,1630.4 134.7,1537.0 149.1,1462.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0152/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1501.0,616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1414361,38.6202641]}},{"type":"Feature","properties":{"resourceCoords":[1501.0,1655.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142403,38.618572]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0153/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p153","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0153/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0153","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"739.7,258.4 738.0,312.7 1045.0,316.0 1568.0,306.2 1571.9,1036.3 1573.1,1674.9 1045.0,1673.0 521.0,1664.5 164.3,1665.7 172.0,1661.3 386.0,593.6 361.0,334.9 438.6,468.4 715.8,275.1 739.7,258.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0153/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1045.0,316.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.142403,38.618572]}},{"type":"Feature","properties":{"resourceCoords":[1045.0,1673.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.139626,38.617584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0154/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p154","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0154/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0154","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"304.0,1049.3 301.6,323.9 1068.2,327.6 1354.4,325.2 1358.4,996.3 1356.2,1680.8 830.0,1679.0 303.9,1684.0 304.0,1049.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0154/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[830.0,1679.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138649,38.619278]}},{"type":"Feature","properties":{"resourceCoords":[830.0,327.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1414361,38.6202641]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0155/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p155","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0155/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0155","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"553.0,86.0 1609.1,88.2 1611.0,749.0 1608.0,1198.2 1605.2,1936.8 1078.0,1912.0 1078.0,1917.5 552.4,1902.5 552.3,1907.2 56.0,1914.4 56.2,1884.8 56.0,1202.0 49.7,532.5 49.9,353.6 69.0,354.0 68.0,302.0 50.0,301.7 50.2,83.9 553.0,86.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0155/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1081.0,1206.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138588,38.622276]}},{"type":"Feature","properties":{"resourceCoords":[553.0,86.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1413966,38.6222503]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0156/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p156","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0156/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0156","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1070.5,1906.6 1127.2,1904.8 1127.6,1892.8 1619.0,1884.2 1603.2,1150.5 1607.1,1150.4 1598.2,458.6 1597.6,411.0 1576.0,412.0 1573.0,384.0 1575.0,363.0 1596.9,363.3 1593.2,89.7 1060.1,73.8 1060.2,79.3 528.9,73.4 528.9,78.0 27.6,94.1 30.8,416.9 32.1,599.5 1.0,600.2 1.0,658.0 31.9,657.1 30.5,1080.4 33.6,1451.3 42.9,1911.6 1070.7,1893.8 1070.5,1906.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0156/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[539.0,1156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13544762289136,38.62010754107342]}},{"type":"Feature","properties":{"resourceCoords":[1589.0,1156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13443066490697,38.62176870395281]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0157/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p157","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0157/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0157","type":"ImageService3","width":1622,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1491.5,1904.8 1161.6,1943.0 228.4,1945.9 141.0,1152.0 93.1,704.1 16.2,46.1 14.2,29.1 27.0,31.0 41.0,27.0 138.2,25.1 155.0,30.1 278.0,21.0 444.0,21.0 538.0,26.0 546.4,26.0 556.0,109.2 1543.2,382.3 1511.8,490.1 1406.1,889.6 1402.0,982.5 1481.5,1802.0 1486.9,1808.1 1621.0,1828.3 1621.0,1841.0 1621.0,1844.5 1621.0,1848.7 1486.0,1849.3 1491.5,1904.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0157/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[141.0,1152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138107,38.623131]}},{"type":"Feature","properties":{"resourceCoords":[631.0,719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.138374,38.624268]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0158/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p158","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0158/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0158","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"519.7,1753.1 208.9,1756.8 197.1,1028.0 201.0,1028.0 195.8,340.9 195.4,293.8 174.0,294.6 173.3,245.9 195.0,246.3 193.3,32.9 1122.8,124.7 1455.2,120.0 1450.5,566.4 1461.4,1011.5 1463.6,1241.1 1441.2,1451.2 1441.7,1708.8 1443.9,1741.9 1445.2,1762.7 1459.7,1834.1 1447.8,1835.7 1382.2,1714.6 520.0,1761.2 519.7,1753.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0158/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[694.0,1028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.133949,38.622589]}},{"type":"Feature","properties":{"resourceCoords":[201.0,1028.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1344245,38.6218016]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0159/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p159","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0159/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0159","type":"ImageService3","width":1622,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1148.4,102.2 1236.1,114.8 1567.5,159.7 1567.2,1477.9 1621.0,1661.5 1621.0,1665.5 1598.3,1681.2 1621.0,1782.7 561.7,1960.8 437.0,1966.0 269.0,1968.0 267.0,1963.0 262.6,1962.8 51.3,1162.5 40.4,1069.7 80.8,656.1 157.6,24.7 249.0,23.0 444.0,21.0 537.0,26.0 556.5,26.0 831.5,57.3 1136.9,100.6 1148.4,102.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0159/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1339.0,1794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13400390921859,38.626202802748246]}},{"type":"Feature","properties":{"resourceCoords":[949.0,89.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13749772070719,38.62761979511647]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0160/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p160","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0160/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0160","type":"ImageService3","width":1654,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"278.2,65.0 1488.4,192.2 1498.2,1732.2 1601.9,1731.7 1532.7,1919.7 1270.1,1874.2 997.0,1950.3 829.0,1911.2 824.3,1846.8 665.3,1737.0 133.6,1803.1 119.9,1732.2 116.8,1678.9 118.5,1423.8 142.4,1216.1 142.1,988.7 135.0,548.0 143.4,106.1 144.2,50.9 277.2,64.8 278.0,57.4 279.0,57.6 278.2,65.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0160/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[135.0,548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.134163,38.624145]}},{"type":"Feature","properties":{"resourceCoords":[1226.0,93.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1340623,38.626252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0161/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p161","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0161/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0161","type":"ImageService3","width":1622,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1491.8,1135.5 1621.0,1581.0 1621.0,1617.8 1621.0,1695.2 1451.9,1768.5 148.8,1929.8 161.3,985.9 141.9,986.0 145.2,206.1 777.9,200.7 860.7,205.8 974.8,201.8 1306.4,143.1 1395.0,649.1 1486.3,1137.7 1491.8,1135.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0161/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[874.0,749.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13340645103972,38.6288284230118]}},{"type":"Feature","properties":{"resourceCoords":[143.0,1746.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13616997828028,38.62858778685689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0162/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p162","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0162/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0162","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"78.0,1194.0 24.3,1650.2 1.0,1705.2 1.0,1781.4 82.3,1780.8 86.0,1780.8 1658.0,1769.4 1658.0,1693.8 1658.0,1665.2 1604.7,1645.7 1590.5,587.1 1589.0,580.0 1590.0,547.5 1587.0,326.1 1658.0,290.4 1658.0,251.2 836.3,152.6 836.3,218.8 294.4,206.2 291.5,216.8 177.2,712.9 72.2,1194.0 78.0,1194.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0162/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13213907576358,38.629556635242714]}},{"type":"Feature","properties":{"resourceCoords":[1659.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.12873245067938,38.628325159141305]}},{"type":"Feature","properties":{"resourceCoords":[1659.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13059967039493,38.62512807754801]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13400629547911,38.62635955364942]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0163/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p163","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0163/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0163","type":"ImageService3","width":1616,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1111.4,71.5 1585.2,68.1 1592.9,558.9 1603.2,1041.5 1589.8,1041.9 1602.6,1102.6 1611.8,1615.9 1608.3,1615.9 1606.2,1877.8 1141.7,1885.6 1142.2,1909.0 14.0,1856.3 14.0,1850.0 13.1,1816.0 14.0,1816.0 12.8,1803.4 80.2,1761.0 75.8,1578.4 208.8,1228.5 143.0,832.2 202.4,417.2 154.6,196.8 546.5,208.7 760.5,80.8 1111.4,71.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0163/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1124.0,1097.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13801022822318,38.615975182314614]}},{"type":"Feature","properties":{"resourceCoords":[1124.0,578.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13907752355534,38.616378683873776]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0164/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p164","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0164/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0164","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1617.1,1900.1 1616.8,1892.1 1612.0,1438.3 1612.5,1072.7 1618.0,655.4 1584.0,656.0 1583.0,599.0 1618.8,598.5 1619.2,418.4 1619.1,70.7 1096.1,74.8 573.2,85.5 51.6,88.4 9.3,88.1 10.1,580.7 8.6,580.7 13.5,1065.2 1.0,1065.3 1.0,1070.4 12.1,1126.4 13.9,1641.5 10.4,1641.5 4.6,1904.3 1617.1,1900.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0164/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1609.0,1100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13604015072715,38.619333954534966]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,84.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13813633579561,38.620097857012716]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0165/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p165","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.59"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0165/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0165","type":"ImageService3","width":1616,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1489.6,1903.2 704.7,1900.3 704.8,1923.8 188.8,1922.3 189.8,63.2 235.6,61.8 696.8,46.8 1492.9,36.0 1489.6,1903.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0165/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1347182947761,38.618995943562744]}},{"type":"Feature","properties":{"resourceCoords":[1616.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13132664450553,38.617752730529006]}},{"type":"Feature","properties":{"resourceCoords":[1616.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13326154346741,38.614484541240856]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13665319373798,38.615727754274594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0166/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p166","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0166/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0166","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1523.7,1566.4 1581.1,1908.8 1477.3,1956.7 653.6,1918.0 499.9,1821.4 138.0,1837.6 46.5,1712.2 85.4,1451.1 55.6,1401.8 109.0,1401.5 182.9,266.3 159.3,266.4 159.6,88.7 687.4,93.2 687.4,69.0 1490.2,76.3 1489.7,268.3 1508.4,268.7 1505.4,782.6 1505.4,782.9 1525.5,1353.3 1568.0,1353.5 1523.7,1566.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0166/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1364455417305,38.61593746151187]}},{"type":"Feature","properties":{"resourceCoords":[1659.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13303288317408,38.61470434694839]}},{"type":"Feature","properties":{"resourceCoords":[1659.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13491341398435,38.61152004217057]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13832607254076,38.612753156734044]}},{"type":"Feature","properties":{"resourceCoords":[688.0,263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1352802,38.6150029]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0167__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p167 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.29"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5908.4"},{"label":"split_canvas_w","value":"5967.6"},{"label":"split_canvas_h","value":"2007.6"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0167__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0167","type":"ImageService3","width":1616,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"902.9,1741.8 872.5,1756.0 1431.8,1809.5 1426.1,1789.2 1427.6,1644.0 1422.3,1560.0 1256.9,1571.1 1256.8,1577.5 1256.8,1579.2 1254.3,1579.2 1132.4,1579.5 1133.5,1665.7 885.5,1671.0 902.9,1741.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0167__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1477.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.13088067696997,38.62055982796579]}},{"type":"Feature","properties":{"resourceCoords":[1491.9,1477.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1293554209668,38.62313066676804]}},{"type":"Feature","properties":{"resourceCoords":[1491.9,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.12825604214345,38.62272689122488]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.12978129814661,38.62015605242263]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0168/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p168","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0168/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0168","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.7,30.7 23.0,34.0 79.0,33.0 83.9,30.1 200.8,29.2 201.0,31.0 242.0,30.0 242.2,28.8 534.4,26.4 650.0,29.0 650.4,28.9 681.8,29.5 682.0,31.0 798.0,32.0 811.9,25.8 937.9,25.8 948.0,26.0 997.0,25.8 1043.0,27.0 1045.1,25.8 1070.4,25.8 1094.0,29.0 1094.7,25.8 1095.3,25.8 1096.0,29.0 1121.7,25.8 1161.2,25.8 1170.0,26.0 1441.0,25.8 1446.0,35.0 1540.0,33.0 1540.2,30.4 1626.5,26.2 1636.7,1059.3 1643.6,1915.3 1610.3,1950.5 1401.6,1950.0 935.4,1847.1 813.4,1888.6 757.1,1840.4 154.7,1819.2 127.7,1465.2 63.9,1453.9 32.4,1335.5 32.6,59.4 11.9,30.8 19.7,30.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0168/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[549.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13119933907551,38.60939935996432]}},{"type":"Feature","properties":{"resourceCoords":[37.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1322592077551,38.609794425943]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0169/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p169","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0169/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0169","type":"ImageService3","width":1622,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"38.0,245.3 50.3,754.1 62.0,755.0 65.0,762.0 77.0,763.0 75.0,793.0 51.2,792.6 75.0,1771.7 73.3,1772.8 1093.4,1771.1 1468.9,1771.5 1616.1,1771.7 1616.5,1204.0 1621.0,1204.0 1621.0,1005.1 1615.8,667.0 1617.5,667.0 1617.3,150.4 1094.2,152.1 1094.0,171.0 575.5,171.1 1.0,194.8 1.0,237.8 38.0,245.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0169/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1094.0,1205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.131493,38.613613]}},{"type":"Feature","properties":{"resourceCoords":[1094.0,171.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.133598,38.614384]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0170/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p170","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0170/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0170","type":"ImageService3","width":1648,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5.9,697.3 2.1,183.5 1597.9,167.1 1599.0,221.3 1599.9,642.2 1602.1,815.1 1578.0,816.0 1580.0,871.0 1602.8,869.6 1606.4,1151.8 1611.0,1786.4 1443.6,1787.4 539.5,1792.9 12.1,1796.0 8.5,1231.5 13.0,1231.5 4.1,697.3 5.9,697.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0170/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,1221.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.13048664114781,38.615322255525726]}},{"type":"Feature","properties":{"resourceCoords":[554.0,1793.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12931977787234,38.61488710432667]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0171/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p171","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0171/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0171","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"119.5,1885.7 65.1,1887.2 60.4,873.6 73.0,874.0 72.0,818.0 60.1,817.5 56.5,24.2 63.9,24.1 64.5,24.1 65.8,51.2 1026.2,49.6 1109.0,120.0 1161.9,53.8 1354.0,56.2 1398.9,100.4 1398.9,64.6 1622.5,110.5 1625.0,219.8 1625.0,943.6 1625.0,1335.3 1617.3,1867.2 1453.8,1865.6 589.1,1872.8 119.5,1885.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0171/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1327283,38.6218456]}},{"type":"Feature","properties":{"resourceCoords":[1626.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1293692,38.6206311]}},{"type":"Feature","properties":{"resourceCoords":[1626.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1312612,38.6174368]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.1346203,38.6186513]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0172/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p172","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0172/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0172","type":"ImageService3","width":1648,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"10.8,219.8 8.3,115.5 252.4,58.1 252.6,81.7 762.8,73.3 762.8,66.0 1265.8,55.9 1638.7,89.0 1640.5,852.8 1555.9,852.0 1561.4,1872.7 1398.0,1876.0 1398.0,1872.1 767.0,1870.2 486.4,1870.8 487.6,1893.5 432.9,1894.9 432.2,1870.9 260.3,1871.3 5.5,1869.2 12.4,1336.7 10.8,219.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0172/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[765.0,852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.128632,38.618694]}},{"type":"Feature","properties":{"resourceCoords":[257.0,852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1296794,38.6190742]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0173/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p173","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0173/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0173","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"113.6,160.8 1124.7,155.2 1497.0,154.1 1598.0,153.8 1611.0,712.0 1607.6,1261.8 1587.6,1261.9 1604.7,1813.4 1124.8,1815.2 75.0,1821.0 66.7,1638.4 76.0,1633.4 77.8,997.2 71.6,983.2 78.0,716.6 75.2,188.3 113.6,160.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0173/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[75.0,161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.131348,38.611504]}},{"type":"Feature","properties":{"resourceCoords":[75.0,1821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127945,38.610245]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0174/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p174","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0174/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0174","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.4,1291.4 21.4,1291.5 28.3,739.8 18.8,179.4 591.2,181.4 1495.5,184.3 1658.0,184.9 1658.0,526.8 1650.7,587.6 1451.3,1847.9 1436.4,1847.9 1161.1,1847.4 582.9,1846.3 259.1,1846.6 15.1,1845.0 1.4,1291.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0174/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[595.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.128182,38.614452]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127197,38.616104]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0175/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p175","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0175/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0175","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"412.9,322.7 424.3,154.2 424.7,85.1 1448.2,78.7 1446.0,314.0 1444.0,850.1 1448.6,1369.9 1446.0,1873.7 389.7,1859.3 201.1,1860.9 172.2,1856.3 214.0,1579.0 412.9,322.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0175/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[214.0,1579.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.125099,38.614998]}},{"type":"Feature","properties":{"resourceCoords":[1446.0,314.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1265196,38.6179226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0176/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p176","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0176/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0176","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"397.0,19.0 585.1,19.8 1638.7,47.2 1634.2,311.4 1641.4,859.3 1652.5,1896.8 1654.7,1936.1 627.0,1952.6 496.0,1950.0 442.0,1949.0 130.0,1952.0 23.5,1947.2 33.2,1891.3 39.7,1352.0 135.7,1354.5 209.4,960.2 238.1,807.4 319.0,281.0 368.2,14.1 397.0,19.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0176/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1376.0,305.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1230253,38.6161427]}},{"type":"Feature","properties":{"resourceCoords":[319.0,281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.124062,38.614449]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0177/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p177","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0177/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0177","type":"ImageService3","width":1626,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"496.9,20.1 499.0,21.0 523.1,19.7 554.5,19.1 556.0,23.0 995.0,18.0 1085.6,32.0 1541.3,21.3 1544.2,140.3 1491.2,140.8 1492.4,200.1 1510.8,200.0 1561.3,198.9 1598.2,1936.4 1116.7,1945.8 587.2,1957.1 158.2,1956.3 153.0,1956.0 152.0,1952.0 69.6,1954.1 67.1,1697.5 62.8,1205.7 51.2,698.3 45.9,174.9 45.1,28.0 496.9,20.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0177/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1113.0,1675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1223050283087,38.61848263591811]}},{"type":"Feature","properties":{"resourceCoords":[54.0,1675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12337441670368,38.6167523637178]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0178/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p178","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.50"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0178/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0178","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"18.8,192.3 70.1,192.2 72.3,1944.9 141.0,1949.0 272.0,1945.0 370.0,1946.4 573.7,1938.9 1576.5,1943.9 1630.3,1893.5 1645.5,1133.2 1602.0,1134.0 1600.0,1104.0 1611.0,1103.0 1600.0,1102.0 1601.0,1077.0 1646.6,1077.0 1650.0,904.1 1603.8,169.4 1449.6,32.4 871.6,40.0 839.3,17.9 827.5,9.8 794.8,13.1 791.0,20.0 772.0,20.0 771.6,15.5 747.0,18.0 699.0,20.0 698.7,17.5 633.3,16.7 632.8,16.8 632.0,19.0 608.0,19.0 607.7,16.9 605.3,16.9 605.0,18.0 400.0,18.0 389.0,12.0 313.0,12.0 312.0,18.0 226.0,14.0 222.0,23.0 197.0,24.0 195.0,15.0 91.0,15.0 73.0,25.0 53.4,25.8 53.9,132.4 1.0,131.8 1.0,192.0 18.8,192.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0178/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[584.0,1931.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12083497834142,38.61991936904447]}},{"type":"Feature","properties":{"resourceCoords":[88.0,1931.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12130778800994,38.61911389112493]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0179/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p179","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0179/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0179","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"37.1,576.5 23.7,22.6 28.0,22.0 115.0,24.0 152.5,21.0 562.0,28.0 1073.2,24.8 1090.0,26.0 1270.0,32.0 1540.0,27.0 1589.2,33.2 1588.5,1277.2 1566.1,1277.7 1592.8,1745.6 1112.7,1754.5 1115.2,1814.1 61.5,1649.0 60.4,1632.6 48.0,1135.8 58.0,1136.0 59.0,1079.0 46.6,1079.0 37.1,576.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0179/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1111.0,1288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.119179,38.617344]}},{"type":"Feature","properties":{"resourceCoords":[562.0,28.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122246,38.617401]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0180/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p180","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0180/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0180","type":"ImageService3","width":1659,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"608.8,1937.8 611.9,1752.2 423.6,1755.0 43.9,1757.8 22.4,1293.8 44.5,1293.5 58.7,49.8 90.0,50.0 592.4,34.5 1610.6,45.8 1594.4,60.8 1649.5,574.3 1632.3,1161.0 1594.0,1164.0 1595.0,1212.0 1630.8,1211.3 1610.5,1904.4 1548.0,1956.0 1523.0,1955.0 1341.0,1955.0 1303.8,1959.8 1251.5,1959.7 1249.0,1955.0 1186.8,1956.5 1187.1,1936.8 608.8,1937.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0180/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[90.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.121262,38.61908]}},{"type":"Feature","properties":{"resourceCoords":[590.0,1753.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1173037,38.6186493]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0181/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p181","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0181/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0181","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1116.1,1895.0 590.2,1891.2 40.3,1891.3 36.2,1209.2 37.0,1170.0 35.9,1169.7 34.0,848.2 30.1,273.6 28.4,23.4 77.0,24.0 79.0,15.0 90.0,12.0 170.0,23.0 220.0,21.0 220.8,16.8 236.9,14.8 305.0,24.5 572.7,68.0 1100.3,137.8 1253.7,163.2 1619.0,223.5 1619.0,1850.2 1567.6,1892.6 1116.1,1895.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0181/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1113.0,841.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12370871848503,38.61279617391197]}},{"type":"Feature","properties":{"resourceCoords":[1113.0,1888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12473258383893,38.61111658058685]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p182 [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":"3140.0"},{"label":"split_canvas_h","value":"5460.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"156.0,168.4 156.0,181.3 67.2,206.8 46.6,287.2 77.7,733.6 47.5,929.2 87.5,1072.1 80.3,1271.9 435.4,1284.8 434.7,1275.8 543.3,1269.9 724.8,1043.8 727.5,716.4 675.6,714.1 698.6,463.0 730.0,463.4 732.1,255.2 171.3,168.6 156.0,168.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[729.0,947.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1144703314635,38.62967688448911]}},{"type":"Feature","properties":{"resourceCoords":[60.0,175.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11753260629466,38.63234700987288]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p182 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3140.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3520.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"848.4,911.9 834.5,1435.7 828.6,1529.8 823.4,1688.8 818.6,1742.9 826.2,1744.6 1147.1,1814.3 1413.1,1874.9 1536.5,1906.7 1626.2,1930.5 1612.4,1331.0 1614.2,1330.9 1577.0,619.6 1590.2,619.0 1570.8,376.9 1557.8,377.4 1617.7,204.2 1610.5,186.2 1393.9,74.2 1396.9,122.2 1153.7,136.2 1153.1,123.4 927.5,115.6 917.7,389.4 947.5,389.7 836.6,912.0 848.4,911.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1171.0,396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11719556166632,38.616654778176155]}},{"type":"Feature","properties":{"resourceCoords":[833.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11944608455113,38.61543001041544]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p182 [3]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5460.0"},{"label":"split_canvas_w","value":"3373.2"},{"label":"split_canvas_h","value":"2456.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"797.5,1926.1 775.0,1878.5 813.8,1810.0 790.7,1708.0 747.5,1669.8 763.5,1490.9 725.7,1437.6 688.5,1426.4 691.4,1411.7 709.8,1394.9 604.6,1402.7 621.5,1415.3 610.9,1433.3 468.4,1442.0 396.6,1396.3 218.6,1409.3 217.9,1365.0 206.6,1365.0 212.1,1650.2 120.5,1650.2 123.4,1743.0 127.2,1897.6 347.8,1891.8 349.1,1904.3 585.4,1876.3 579.7,1829.7 797.5,1926.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0182__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[121.0,1661.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1173037,38.6186493]}},{"type":"Feature","properties":{"resourceCoords":[809.3,1661.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1144634,38.6176015]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0183/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p183","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0183/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0183","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"75.0,1129.0 71.0,71.4 626.4,73.6 1157.6,79.7 1613.7,79.0 1569.6,126.3 1556.7,386.7 1568.4,1749.2 1129.7,1881.7 641.1,1859.5 640.9,1847.0 79.0,1900.5 75.0,1129.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0183/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1607.0,1129.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.124825,38.609096]}},{"type":"Feature","properties":{"resourceCoords":[75.0,1129.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127945,38.610245]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0184__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p184 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0184__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0184","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"64.0,1327.5 170.4,1558.4 368.6,1660.3 546.2,1662.5 594.1,1766.5 671.8,1260.2 951.7,1265.7 1042.9,1190.0 988.1,1089.3 1014.9,892.0 916.5,660.1 1119.5,542.5 1119.5,534.6 1119.6,527.5 1119.6,526.9 1151.7,516.4 1159.4,513.8 1181.6,506.5 1553.3,291.1 1553.4,42.3 1115.6,170.2 629.5,144.0 629.5,131.6 69.7,179.9 68.7,459.6 64.0,1327.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0184__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[75.0,467.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12893816311745,38.60854939978736]}},{"type":"Feature","properties":{"resourceCoords":[75.0,1448.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12986658349936,38.60697446691457]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0185/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p185","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0185/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0185","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"294.1,1965.4 274.0,1961.0 166.0,1956.0 129.0,1949.0 53.4,1837.3 63.9,23.0 73.0,23.0 75.0,16.0 87.0,12.0 119.0,19.0 291.0,12.0 668.0,25.0 947.0,16.0 1113.0,27.0 1379.0,31.0 1545.0,26.0 1619.0,32.0 1619.0,581.6 1504.3,1296.6 1412.3,1834.5 1395.5,1918.8 294.1,1965.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0185/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[429.0,513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.122238,38.610977]}},{"type":"Feature","properties":{"resourceCoords":[1630.0,513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.121109,38.612873]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0186/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p186","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0186/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0186","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"329.1,38.1 1417.5,88.8 1370.3,249.1 1291.0,511.0 1263.8,596.3 1145.5,1013.8 1255.0,1486.7 1247.5,1486.8 1061.3,1954.1 938.0,1957.0 932.0,1963.0 825.0,1960.0 824.4,1970.3 801.0,1970.0 801.0,1958.0 706.0,1956.0 705.4,1968.8 473.5,1965.7 473.0,1953.0 270.0,1951.0 253.6,1951.7 162.6,1880.9 105.5,1046.5 171.2,868.0 133.5,132.4 192.5,70.4 165.3,15.8 193.8,18.9 194.0,20.0 203.1,20.0 309.6,32.0 329.1,38.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0186/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1005.0,1492.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11583,38.609947]}},{"type":"Feature","properties":{"resourceCoords":[1291.0,511.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.117691,38.611008]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0187__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p187 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.04"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3182.0"},{"label":"split_canvas_w","value":"6472.0"},{"label":"split_canvas_h","value":"4734.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0187__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0187","type":"ImageService3","width":1618,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"13.3,1188.0 13.3,1296.1 14.0,1301.3 13.3,1310.6 22.5,1311.0 21.9,1382.2 67.0,1381.2 69.0,1431.2 21.6,1431.2 18.6,1850.0 23.0,1851.0 23.0,1905.0 18.1,1906.2 18.0,1923.0 28.5,1933.5 44.6,1912.6 1531.2,1916.5 1580.8,1188.8 1617.0,1172.4 1617.0,998.2 1517.0,1018.4 1501.2,870.4 1536.0,812.8 1143.5,853.5 1143.7,868.5 585.1,948.5 584.9,938.6 23.3,1037.8 23.6,1048.5 11.7,1077.4 13.0,1095.4 4.0,1096.1 5.6,1151.3 8.0,1151.3 10.0,1177.3 6.3,1177.7 6.5,1181.2 13.3,1188.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0187__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1517.0,1018.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.111992,38.60899]}},{"type":"Feature","properties":{"resourceCoords":[30.0,1257.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1149036,38.6094352]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0188__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p188 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.73"},{"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":"6660.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0188__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0188","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,988.9 1.0,1104.5 35.0,1091.3 168.2,1761.7 1054.3,1875.4 1516.7,1828.7 1620.3,1758.2 1634.7,879.1 885.6,856.5 835.2,787.6 833.6,787.6 833.6,785.4 792.1,728.7 790.8,518.3 677.6,435.4 667.5,435.6 667.5,427.9 640.0,407.8 618.8,55.0 485.7,79.8 419.4,607.6 131.1,687.3 121.5,623.8 24.9,986.5 1.0,988.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0188__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1198.0,1833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.109451,38.606846]}},{"type":"Feature","properties":{"resourceCoords":[1650.0,1833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.108452,38.606609]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0189__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p189 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.11"},{"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":"6480.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0189__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0189","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"270.8,1913.4 698.1,1925.9 698.6,1895.6 882.2,1901.7 1004.2,1897.5 1524.0,1904.0 1528.7,1484.7 1540.0,1484.9 1533.8,242.4 1516.1,168.3 1348.9,93.3 888.9,57.9 920.1,733.8 794.2,1064.1 565.6,1407.7 422.1,1440.7 420.1,1443.2 395.7,1472.7 390.7,1478.7 258.7,1478.2 126.1,1574.9 55.5,1848.2 270.8,1913.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0189__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1114.0,1482.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1690961,38.6577908]}},{"type":"Feature","properties":{"resourceCoords":[703.0,1482.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1700507,38.6574562]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0190/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p190","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0190/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0190","type":"ImageService3","width":1665,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"88.0,1930.6 87.6,1460.2 100.3,1460.2 76.3,66.4 253.8,119.4 743.0,24.8 1413.6,67.1 1444.3,130.2 1371.5,297.8 1509.7,457.4 1521.9,811.4 1627.0,989.9 1609.3,1512.0 1607.0,1512.0 1605.0,1561.0 1607.0,1566.0 1607.5,1566.0 1595.5,1922.4 1610.0,1925.0 1474.1,1926.9 548.0,1931.1 88.0,1930.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0190/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.0,1461.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.167171,38.6584472]}},{"type":"Feature","properties":{"resourceCoords":[1486.0,1461.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1652188,38.6591094]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0191/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p191","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0191/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0191","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"491.8,58.6 492.2,24.8 697.0,31.0 833.0,26.1 1038.7,28.0 1039.0,28.0 1412.6,31.5 1588.3,33.3 1593.6,491.8 1597.2,491.8 1585.6,988.1 1584.9,1477.6 1588.0,1477.6 1580.9,1899.0 1539.6,1944.2 1167.8,1960.8 45.5,1933.0 48.5,1552.9 51.0,1553.0 54.0,1499.0 48.9,1498.8 60.0,59.5 15.3,46.1 491.8,58.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0191/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[477.0,1475.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1683145,38.6543293]}},{"type":"Feature","properties":{"resourceCoords":[1407.0,492.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1672878,38.6566051]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0192/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p192","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0192/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0192","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"28.7,993.8 33.5,492.3 29.9,492.4 18.1,29.4 302.4,28.3 1231.9,19.8 1368.3,17.2 1585.5,55.8 1631.6,200.3 1631.5,1422.4 1515.0,1597.0 1512.0,1836.8 1343.4,1822.7 1299.2,1886.9 1082.5,1927.0 986.2,1919.0 958.1,1848.7 683.2,1830.6 309.1,1946.1 235.9,1938.2 44.0,1905.8 36.9,1913.8 38.0,1488.1 35.0,1488.1 28.7,993.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0192/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[778.0,985.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1649056,38.6564619]}},{"type":"Feature","properties":{"resourceCoords":[309.0,1938.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1650311,38.6545894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0194/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p194","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0194/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0194","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1585.5,1942.8 407.2,1920.0 406.9,1944.1 76.8,1923.0 84.7,1633.6 42.9,1633.5 54.1,1333.0 70.3,1333.2 73.8,970.7 66.8,62.3 1573.9,43.2 1645.7,712.7 1662.0,686.1 1662.0,693.4 1655.4,752.0 1641.7,1105.4 1600.7,1124.3 1598.0,1182.8 1642.3,1162.3 1640.7,1374.2 1592.1,1373.1 1585.5,1942.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0194/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[612.0,829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.120211556592,38.634344440903114]}},{"type":"Feature","properties":{"resourceCoords":[1578.0,1360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.1213874215333,38.63264286431541]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p195 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"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":"6496.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195","type":"ImageService3","width":1624,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"577.1,714.5 482.9,634.5 482.9,634.5 69.3,649.3 42.3,698.5 37.7,766.0 40.0,1118.0 1.0,1138.0 1.0,1196.2 43.1,1174.5 51.0,1385.1 2.6,1386.2 11.7,1655.7 34.0,1657.0 35.0,1692.0 34.0,1711.0 13.5,1711.0 21.6,1951.3 49.6,1952.0 1023.0,1928.9 1563.0,1916.7 1591.6,1840.1 1615.2,1857.5 1600.7,1345.7 1623.0,1345.0 1623.0,1165.0 1623.0,585.0 816.4,775.1 1623.0,358.4 1623.0,302.8 896.6,676.9 897.7,726.7 804.5,729.9 799.2,685.2 577.1,714.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1035.0,1368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12146282072145,38.63079778885072]}},{"type":"Feature","properties":{"resourceCoords":[24.0,1368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.12137734464528,38.632579167998486]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p195 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.13"},{"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":"3758.4"},{"label":"split_canvas_h","value":"2585.6"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195","type":"ImageService3","width":1624,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"903.2,123.7 185.1,102.8 193.7,28.4 46.0,43.6 89.2,198.2 22.4,447.5 1.0,447.9 1.0,494.6 95.7,502.3 100.4,450.8 901.1,146.2 903.2,123.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0195__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.11893066659263,38.63122766835923]}},{"type":"Feature","properties":{"resourceCoords":[939.6,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.11877163474938,38.62962147382102]}},{"type":"Feature","properties":{"resourceCoords":[939.6,646.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.12017477024041,38.6295354949068]}},{"type":"Feature","properties":{"resourceCoords":[0.0,646.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.12033380208365,38.63114168944501]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0197/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p197","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0197/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0197","type":"ImageService3","width":1622,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1134.2,1950.2 72.2,1942.7 18.6,1901.0 17.9,1778.3 61.0,1779.0 62.0,1748.0 48.0,1743.0 40.0,1732.0 17.6,1730.5 15.8,1393.4 38.0,1393.2 55.4,640.0 76.0,635.6 75.2,408.3 61.5,414.9 61.8,360.2 75.0,353.8 63.4,332.9 67.9,136.9 107.1,152.2 90.8,69.0 234.3,29.1 848.7,27.8 1487.1,117.2 1512.5,829.8 1605.6,972.5 1588.7,1905.7 1548.8,1957.1 1436.5,1958.8 1134.4,1959.2 1134.2,1950.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0197/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[621.0,1381.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.121452,38.628723]}},{"type":"Feature","properties":{"resourceCoords":[621.0,54.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.118431,38.628689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0198__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p198 [1]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"26"},{"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":"6652.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0198__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0198","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"75.5,1784.3 74.5,1935.4 267.1,1953.3 513.6,1953.6 575.1,1953.7 575.2,1932.1 812.4,1927.5 812.4,1931.6 1063.0,1931.2 1063.0,1929.2 1323.8,1935.8 1578.6,1913.2 1579.0,1794.0 1581.1,1266.8 1580.4,1266.8 1545.5,543.9 1506.2,543.8 1488.8,132.6 1441.0,96.2 1441.2,59.4 1409.5,55.8 1337.7,73.6 1346.0,292.1 1299.0,384.2 1141.5,379.7 1133.6,413.5 1077.6,378.9 753.3,366.9 751.8,366.9 751.9,362.1 751.9,360.1 667.4,87.2 528.8,36.4 333.2,26.2 73.1,49.0 55.5,363.4 86.8,363.8 85.8,533.5 80.5,923.1 80.5,1033.6 75.5,1784.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0198__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[583.0,538.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.106323,38.636795]}},{"type":"Feature","properties":{"resourceCoords":[1579.0,1794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.101677,38.632343]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0200/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p200","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0200/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0200","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"740.6,1699.7 419.1,1700.6 417.4,1751.6 170.5,1731.8 170.5,1701.0 63.2,1701.1 50.7,1140.6 69.2,1140.6 68.7,403.5 68.3,403.5 97.1,61.7 380.0,34.7 379.9,37.4 480.3,37.2 487.2,21.1 535.0,23.7 534.9,37.2 1375.2,36.0 1375.2,28.1 1610.5,48.1 1638.0,506.5 1626.8,1933.3 981.2,1948.8 969.8,1953.7 964.6,1875.3 740.6,1699.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0200/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1210.0,1269.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11250096753106,38.62766732548728]}},{"type":"Feature","properties":{"resourceCoords":[1594.0,387.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.10845711682438,38.626311440769975]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0201/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p201","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0201/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0201","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1071.5,1957.2 983.6,1959.2 341.6,1958.3 249.0,1942.0 12.8,1940.0 12.2,1935.6 12.1,1934.8 41.8,1934.8 76.8,1560.6 69.2,1055.4 61.9,1055.4 56.0,543.0 79.7,543.0 23.4,297.5 28.6,297.4 75.6,72.8 39.5,72.6 84.2,27.6 701.4,39.5 758.8,13.2 1358.7,72.9 1358.4,52.0 1505.6,73.5 1574.7,352.2 1581.1,768.8 1489.9,844.2 1566.4,901.4 1497.4,1025.3 1580.3,1096.3 1562.3,1935.2 1591.2,1955.0 1395.0,1962.0 1158.8,1963.0 1148.2,1957.2 1071.5,1957.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0201/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[342.0,1056.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.127625,38.6204]}},{"type":"Feature","properties":{"resourceCoords":[342.0,74.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.129646,38.621124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0202/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p202","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0202/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0202","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"44.0,1722.2 58.5,1124.4 60.1,1124.4 56.6,414.3 69.7,414.2 61.8,172.2 48.8,172.1 116.6,2.4 140.7,72.0 354.0,38.9 730.5,63.8 798.6,36.1 1184.4,29.0 1381.2,42.5 1489.3,95.0 1525.7,70.1 1571.3,107.4 1606.2,373.2 1560.7,548.4 1642.1,1031.0 1615.0,1530.8 1638.8,1655.4 1596.2,1844.6 1565.9,1848.8 1480.8,1864.3 1475.1,1799.0 1490.9,1773.8 1317.7,1788.5 1317.7,1795.1 1070.9,1825.7 1070.9,1821.3 822.7,1860.4 822.7,1865.1 579.0,1764.3 579.0,1760.5 339.9,1812.6 130.1,1750.2 87.3,1736.0 44.0,1722.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0202/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[795.0,425.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.11278172297638,38.614525613190125]}},{"type":"Feature","properties":{"resourceCoords":[1531.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.10919367855203,38.6147629202954]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0203/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p203","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0203/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0203","type":"ImageService3","width":1620,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1592.3,1866.0 1580.3,1865.8 1567.5,1614.0 1588.1,1614.8 1588.8,451.9 1578.5,451.5 1569.7,34.6 1467.2,24.2 1219.8,24.9 1219.8,40.8 957.5,64.5 689.0,58.2 689.0,60.3 431.0,61.0 431.1,56.9 186.8,61.9 186.7,84.2 1.0,84.2 1.0,96.3 22.1,98.2 47.8,388.8 45.0,388.6 44.5,491.8 59.0,492.0 61.0,499.0 58.0,548.0 44.2,547.8 39.6,1410.6 47.8,1410.7 25.6,1652.2 31.8,1651.8 29.5,1841.7 59.5,1931.2 183.7,1913.3 349.9,1954.1 477.8,1951.7 563.5,1910.1 1524.2,1956.4 1578.8,1929.9 1586.2,1895.1 1592.3,1866.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0203/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[952.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.102844,38.630554]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1610.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.100487,38.626465]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0204/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p204","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0204/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0204","type":"ImageService3","width":1663,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"453.9,39.0 954.0,39.1 1329.4,35.5 1335.4,35.4 1603.0,312.6 1602.6,613.5 1609.7,963.7 1609.0,1130.6 1610.1,1207.2 1609.0,1447.6 1609.9,1639.4 1608.7,1918.3 1565.6,1956.6 1547.0,1956.5 1548.0,1943.9 92.4,1937.1 89.7,1950.3 87.4,1950.3 77.8,1950.2 63.5,1702.7 83.7,1703.4 76.2,560.0 66.0,559.6 51.2,37.1 453.9,39.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0204/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[465.0,1118.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.09823189613853,38.62853171589656]}},{"type":"Feature","properties":{"resourceCoords":[702.0,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.09718047369797,38.63229852343276]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0206/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p206","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"23"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0206/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0206","type":"ImageService3","width":1646,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"119.0,1397.0 109.2,1121.3 100.9,931.8 92.5,694.1 88.4,618.5 82.6,453.5 61.8,107.7 651.8,102.0 1091.7,96.0 1089.6,51.8 1528.8,72.1 1588.4,156.8 1610.8,367.2 1600.6,612.7 1412.0,611.8 1386.4,635.3 1390.1,740.8 1255.9,787.0 1250.5,1062.5 1369.1,1111.2 1404.8,1268.3 1346.2,1425.0 1345.8,1632.5 1328.3,1670.8 1300.7,1634.0 1161.4,1642.7 1150.6,1873.2 1114.3,1912.1 1013.4,1938.3 485.4,1941.7 76.9,1907.0 44.5,1844.0 58.9,1454.9 119.0,1397.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0206/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[611.0,1172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.090744,38.626461]}},{"type":"Feature","properties":{"resourceCoords":[317.0,105.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.091919,38.630314]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0207/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p207","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0207/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0207","type":"ImageService3","width":1604,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"147.7,1295.1 146.9,1839.7 146.8,1946.8 394.9,1945.8 497.9,1956.2 495.3,1841.2 906.2,1845.7 1416.5,1849.0 1536.5,1848.6 1550.7,1051.8 1566.2,1052.3 1569.9,555.3 1571.3,496.9 1561.4,65.9 1394.6,25.2 527.3,35.1 235.2,74.7 1.0,48.3 1.0,86.9 49.4,123.6 68.5,548.4 109.1,548.4 147.0,1295.1 147.7,1295.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0207/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[651.0,1319.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.09946396117384,38.63416813928123]}},{"type":"Feature","properties":{"resourceCoords":[1567.0,1319.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.09539670511896,38.63420301676355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0208/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"East Saint Louis, Illinois | 1950 | sanborn01838_007 p208","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T00:25:46Z","modified":"2026-10-18T00:25:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0208/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0208","type":"ImageService3","width":1656,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"597.1,1624.9 327.7,1348.8 321.6,1348.9 63.6,1352.8 68.2,571.2 83.6,571.5 81.4,84.0 80.8,26.6 81.1,26.6 82.1,26.6 83.0,54.1 655.1,30.8 987.0,57.2 1170.0,30.4 1551.5,56.8 1631.6,94.8 1601.6,639.2 1585.0,639.0 1584.0,695.0 1606.0,695.6 1627.5,963.9 1628.1,1002.9 1614.0,1903.0 1639.7,1905.1 1640.2,1949.9 1195.1,1940.7 598.3,1926.1 597.1,1624.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g01838195002:01838_02_1950-0208/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[856.0,1342.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.091919,38.632401]}},{"type":"Feature","properties":{"resourceCoords":[1369.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.089592,38.636887]}}]}}]}