{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn04858_035.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Saint Louis, Missouri | 1951 | 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":"106"},{"label":"placed","value":"104"},{"label":"unplaced","value":"2"},{"label":"fit sources","value":"georef-snap 69, georef 33, snap:0 2"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"2 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p20 (tier 2, 38.66968,-90.29819 +/-138m); p27__1 (tier 1, 38.66391,-90.28453 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p1","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0001","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.4,1788.0 47.1,1400.9 11.6,229.5 46.1,133.6 228.2,55.1 868.5,118.0 1173.3,46.8 1385.3,65.7 1529.7,183.8 1529.1,324.4 1577.8,976.9 1623.9,1527.2 1641.0,1730.9 1641.0,1788.7 1641.0,1805.4 1608.3,1805.1 133.4,1788.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[64.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28616331740018,38.673897264034565]}},{"type":"Feature","properties":{"resourceCoords":[1590.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28325205098352,38.67235257033841]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0010","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"7.0,97.5 573.1,152.8 1166.2,212.2 1611.1,252.3 1611.5,273.6 1582.0,275.9 1592.7,868.3 1518.6,1264.0 1584.3,1441.5 1499.1,1511.7 1513.2,1813.8 1290.3,1880.8 391.6,1845.5 104.1,1894.8 47.0,1837.5 4.8,1866.9 7.0,97.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1175.0,215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26522227462044,38.66341398930448]}},{"type":"Feature","properties":{"resourceCoords":[38.0,63.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26607750402653,38.66145478463921]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p100","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0100","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"197.9,67.8 198.0,68.1 1161.9,92.7 1215.3,74.8 1499.1,88.9 1501.8,834.0 1509.5,1856.8 1509.5,1875.5 1222.3,1883.5 1168.5,1871.0 1168.5,1855.5 204.8,1876.4 205.0,1934.0 195.2,1934.3 188.8,1934.5 183.2,1891.2 78.5,1889.8 51.5,1796.2 94.1,1201.0 33.0,380.2 52.9,71.6 156.9,64.0 197.9,67.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1502.0,879.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.294507,38.6493577]}},{"type":"Feature","properties":{"resourceCoords":[201.0,879.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2948956,38.6470064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p101","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0101","type":"ImageService3","width":1623,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.3,1642.5 99.1,1643.6 64.1,671.4 79.7,671.1 91.5,616.6 79.2,326.8 953.2,315.5 994.0,315.0 993.8,249.8 1507.4,268.2 1548.8,590.4 1539.7,590.6 1535.8,643.8 1557.4,643.4 1541.8,1617.3 1569.2,1616.9 1599.5,1873.2 1494.0,1912.2 1373.5,1861.6 1405.2,1819.3 1118.7,1769.9 835.4,1848.4 424.2,1824.5 247.5,1646.0 158.0,1658.9 157.3,1642.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0101/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29227270168238,38.64974326859819]}},{"type":"Feature","properties":{"resourceCoords":[1623.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28855990769104,38.649326342305976]}},{"type":"Feature","properties":{"resourceCoords":[1623.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28920081605462,38.64584336346887]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29291361004596,38.64626028976109]}},{"type":"Feature","properties":{"resourceCoords":[994.0,315.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2901024,38.648925]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0102","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1666.0,1835.3 1652.0,1829.0 1652.0,1788.0 1655.0,1784.0 1659.4,1784.0 1666.0,1744.2 1593.9,1742.2 1474.0,1772.9 1486.6,1726.1 1486.0,1635.4 1476.2,1630.2 1522.2,1558.5 1565.3,1466.3 1584.7,1393.3 1592.1,1284.3 1597.5,889.9 1607.1,832.9 1628.4,792.4 1616.7,699.9 1615.8,514.6 1617.3,357.9 1.0,251.2 1.0,286.8 87.0,292.0 119.0,605.6 110.1,605.6 104.9,657.1 126.0,657.3 85.3,1602.0 112.2,1602.2 135.0,1851.7 229.0,1819.9 1018.8,1844.1 1373.3,1919.3 1534.6,1915.0 1614.0,1840.0 1666.0,1835.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0102/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28903640087695,38.64943504175595]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2851207470789,38.64907368191435]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2856579145712,38.6454729819877]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28957356836925,38.6458343418293]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p103","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0103","type":"ImageService3","width":1623,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"124.4,572.5 128.2,760.5 141.5,854.2 120.5,895.6 111.7,953.6 112.2,1354.0 106.5,1464.7 87.9,1539.1 45.6,1633.4 1.0,1705.2 1.0,1707.3 10.0,1712.0 12.0,1804.0 1.0,1847.7 1.0,1851.4 121.2,1818.7 194.4,1819.7 181.5,1905.9 195.8,1912.0 681.6,1860.9 873.1,1894.9 1232.3,1839.8 1541.8,1917.5 1589.9,1829.4 1601.8,1830.2 1594.8,1677.2 1578.3,1677.3 1604.9,826.5 1611.6,786.5 1590.2,265.7 1426.9,267.0 122.7,277.5 123.0,332.2 124.4,572.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0103/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2854946076994,38.64920392267471]}},{"type":"Feature","properties":{"resourceCoords":[1623.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28174605749355,38.64881232445891]}},{"type":"Feature","properties":{"resourceCoords":[1623.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2823439542644,38.64527182553266]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28609250447026,38.64566342374846]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p104","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0104","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.6,1703.2 34.0,1703.1 65.4,839.8 72.4,799.3 53.7,270.6 275.2,270.3 1453.8,269.2 1587.0,269.1 1581.3,796.5 1584.5,836.7 1575.5,1701.7 1539.8,1701.7 1598.1,1780.2 1553.3,1870.0 1287.3,1911.2 417.6,1825.5 377.5,1843.8 372.2,1883.9 56.8,1858.5 50.6,1703.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0104/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2819477414346,38.64883440240942]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.27812556509642,38.648456628491644]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.27869095955232,38.64496567853895]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28251313589051,38.64534345245673]}},{"type":"Feature","properties":{"resourceCoords":[1611.0,269.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.278332,38.6479875]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0011","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"104.1,1552.8 94.2,1368.0 84.8,1282.4 81.8,1272.5 77.8,1237.4 58.3,815.9 61.0,816.0 67.0,772.0 65.0,768.0 56.1,768.0 30.5,215.6 15.6,146.4 1491.5,173.4 1530.6,174.1 1558.9,174.2 1556.2,524.1 1588.8,992.0 1632.4,1542.1 1643.0,1700.3 1643.0,1822.7 1609.6,1822.2 1089.0,1816.0 123.7,1802.5 104.1,1552.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[71.0,983.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28805825421485,38.67130228534331]}},{"type":"Feature","properties":{"resourceCoords":[1602.0,983.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2851265863166,38.669769283065]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0012","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.9,1518.4 95.7,1676.1 104.9,1798.1 153.4,1798.4 1612.7,1808.3 1619.0,1805.0 1616.0,1682.0 1620.0,1602.0 1628.0,1602.0 1628.0,1509.7 1581.8,980.5 1545.9,566.6 1518.5,158.6 1323.5,157.2 484.6,152.1 6.0,154.9 1.0,154.9 1.0,516.5 36.2,970.2 83.9,1518.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1038.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28325479053296,38.66874574648045]}},{"type":"Feature","properties":{"resourceCoords":[1038.0,1814.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28434761979089,38.66749298873442]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0013","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"102.9,1635.1 121.4,1555.5 124.4,925.4 121.3,505.5 126.3,92.0 1053.5,172.7 1520.9,210.0 1513.5,1045.4 1514.2,1884.0 816.0,1826.0 127.8,1765.5 96.1,1759.3 102.9,1635.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[590.0,1818.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28231227431277,38.66638806431573]}},{"type":"Feature","properties":{"resourceCoords":[590.0,156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28042790470029,38.668964131947966]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0014","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"571.7,1791.0 108.7,1750.6 107.9,917.2 115.2,87.0 575.3,131.1 1493.6,200.2 1490.8,1032.1 1029.8,993.9 1027.8,1756.9 1036.2,1830.3 571.7,1791.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1031.0,144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27687675582666,38.66715145515558]}},{"type":"Feature","properties":{"resourceCoords":[566.0,1788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27968165208597,38.66500173137088]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0015","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"10.3,113.3 27.8,870.4 62.0,872.0 60.0,918.0 28.8,917.0 41.4,1462.7 1.0,1465.5 1.0,1929.9 229.1,1914.2 805.1,1869.5 1613.8,1802.5 1623.8,1339.7 1624.1,881.4 1634.0,437.7 820.2,498.2 822.5,44.5 76.2,100.6 10.3,113.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[804.0,1420.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27520470813624,38.664383639150415]}},{"type":"Feature","properties":{"resourceCoords":[804.0,491.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27700711429642,38.665339552827376]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0016","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1157.5,1843.5 1154.3,1837.2 826.5,1835.8 113.0,1833.8 65.5,1843.5 47.8,1851.1 19.1,653.0 4.5,654.2 3.2,195.4 238.2,174.9 809.1,125.2 1607.8,51.7 1607.0,159.0 1614.8,462.4 1615.4,512.6 1617.0,913.7 1565.0,917.0 1564.0,955.0 1617.2,957.5 1619.3,1486.4 1615.3,1673.7 1615.0,1682.0 1614.0,1733.0 1615.9,1735.2 1614.5,1839.2 1444.3,1838.5 1248.7,1837.7 1157.5,1843.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[811.0,1855.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27096661528206,38.66210705282611]}},{"type":"Feature","properties":{"resourceCoords":[811.0,123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27433301271397,38.66392803344249]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p17 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"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":"6576.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"136.0,1899.0 1324.0,1911.8 1330.2,1649.4 1332.0,1352.0 1516.0,1353.9 1570.7,685.4 1552.6,684.2 1551.9,113.5 771.8,91.4 701.2,224.0 701.0,238.5 663.2,309.1 656.0,309.1 498.9,604.5 157.9,1248.1 144.1,1295.5 141.1,1335.0 136.0,1899.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[136.0,1899.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2721809,38.6599061]}},{"type":"Feature","properties":{"resourceCoords":[1332.0,1352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2692774,38.660626]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p17 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.74"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2820.0"},{"label":"split_canvas_h","value":"1236.4"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"700.2,239.9 701.0,238.5 701.4,215.6 703.0,121.9 145.5,54.2 76.6,45.9 1.0,201.3 1.0,248.1 700.2,239.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0017__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":[-90.27007153333322,38.663446614287764]}},{"type":"Feature","properties":{"resourceCoords":[705.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26847966850818,38.6632439498993]}},{"type":"Feature","properties":{"resourceCoords":[705.0,309.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26859262890447,38.662695298935446]}},{"type":"Feature","properties":{"resourceCoords":[0.0,309.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.27018449372952,38.66289796332392]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0018","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1315.7,1351.5 1593.7,1350.4 1595.7,1651.7 1600.9,1916.3 1550.0,1918.0 1272.2,1918.3 1217.0,1917.0 1169.4,1918.4 119.0,1919.4 116.3,1919.4 114.0,1906.0 94.0,1905.0 89.0,1911.0 89.0,1919.2 40.5,1919.5 42.9,1655.8 40.4,1356.9 225.3,1356.1 270.6,683.5 252.4,682.5 243.3,109.1 175.8,108.2 180.0,21.0 193.0,27.0 290.0,23.0 354.0,20.0 373.9,18.9 1475.3,182.2 1386.2,745.5 1341.7,1041.0 1314.6,1216.5 1313.0,1282.0 1315.7,1351.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[60.0,1913.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26940647372179,38.659629565131894]}},{"type":"Feature","properties":{"resourceCoords":[60.0,1360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26923367122102,38.66061560522269]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p19","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.39"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0019","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1394.5,1927.3 1589.2,1918.1 1619.5,1854.5 1506.7,596.5 1599.8,555.9 1587.9,53.4 200.3,23.3 103.9,101.9 125.8,294.9 49.2,348.8 19.2,547.7 59.9,968.0 61.0,968.0 60.8,977.7 62.4,994.0 22.3,1833.2 1.0,1843.0 1.0,1873.5 1394.5,1927.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0019/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.30151156848012,38.67322000006383]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29771803258424,38.672883038396854]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2982269245921,38.66938678696041]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.30202046048798,38.66972374862738]}},{"type":"Feature","properties":{"resourceCoords":[239.0,-73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3009445,38.673303]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p2","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0002","type":"ImageService3","width":1631,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.3,1781.7 633.2,1777.4 1467.3,1780.0 1630.0,1780.6 1630.0,1430.9 1515.2,140.2 1446.3,102.0 532.6,70.5 51.0,130.3 18.8,188.5 1.0,174.0 1.0,325.4 51.0,960.0 98.9,1505.9 123.3,1782.0 157.3,1781.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[566.0,960.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2822969,38.6718261]}},{"type":"Feature","properties":{"resourceCoords":[51.0,960.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2832842,38.6723546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.75"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0021","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"114.7,1125.2 139.1,922.2 247.9,889.0 273.8,775.0 243.4,473.5 133.9,350.9 126.5,128.8 472.0,23.3 571.1,22.9 1421.9,72.7 1495.3,172.3 1396.8,725.1 1297.8,1296.2 1304.2,1933.9 1219.0,1926.0 834.0,1925.0 647.8,1928.8 142.7,1921.3 114.7,1125.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0021/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2972260600005,38.672288724101925]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2934093828066,38.671986566149485]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29386276950437,38.668446150293875]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29767944669827,38.668748308246315]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0022","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"326.8,1274.4 308.8,692.6 294.1,128.8 310.6,143.8 1292.6,54.6 1364.3,202.9 1298.1,651.2 1224.2,1236.9 1313.8,1741.2 1072.6,1788.7 462.7,1904.4 326.8,1274.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0022/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.294371628646,38.6720851582509]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2907766844565,38.671202057707575]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29212047304145,38.667820219188165]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29571541723095,38.66870331973149]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0023","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.8,1261.7 61.8,1229.0 61.9,1206.7 61.9,1115.7 70.0,1116.0 71.0,1069.0 61.9,1068.5 61.9,898.3 48.8,621.9 41.5,93.2 811.1,86.0 1578.5,73.0 1587.0,703.5 1592.1,953.2 1597.0,1379.6 1612.2,1386.3 1615.0,1462.2 1632.4,1933.7 1623.0,1932.0 1609.6,1934.8 1546.2,1937.8 1023.0,1747.0 1016.8,1736.2 1000.3,1724.2 784.1,1631.4 399.1,1472.5 205.9,1403.0 103.4,1370.8 51.1,1345.9 61.8,1261.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1026.0,1728.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29109045390072,38.66717608031009]}},{"type":"Feature","properties":{"resourceCoords":[71.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29228766824933,38.665586224940725]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0024","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"664.5,1520.3 853.3,1598.1 1106.2,1709.0 1336.9,1805.3 1505.5,1880.6 1585.9,1911.2 1590.6,1913.2 1596.0,1913.0 1599.2,1911.9 1229.2,1743.4 1211.8,1594.8 1294.8,1532.3 1570.2,731.8 1514.5,574.4 1082.8,426.5 516.4,245.6 1.0,240.6 1.0,661.8 14.2,667.9 16.1,742.8 27.4,1219.7 664.5,1520.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[811.0,954.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29081908688111,38.669654212912405]}},{"type":"Feature","properties":{"resourceCoords":[1104.0,1718.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28898830490607,38.67001860013368]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0025","type":"ImageService3","width":1673,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1138.0,1855.8 202.6,1857.4 171.4,1870.5 168.8,1874.5 102.4,1328.4 60.2,1254.4 70.7,1248.5 66.8,1157.7 87.0,1158.0 88.0,1115.0 79.0,1110.0 64.7,1109.5 40.6,543.3 21.6,339.6 2.2,63.6 967.7,67.4 1488.4,68.3 1530.1,68.4 1552.8,68.5 1556.1,330.1 1577.4,559.6 1606.2,982.8 1672.0,1741.1 1672.0,1844.1 1672.0,1862.6 1641.7,1862.2 1138.0,1855.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[507.0,980.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28924111633758,38.66815081073227]}},{"type":"Feature","properties":{"resourceCoords":[967.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.287196297219,38.66901804508937]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p26","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0026","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.0,1867.8 163.4,1841.5 171.5,1857.4 214.0,1838.6 693.3,1846.0 1446.6,1863.8 1494.9,1894.6 1507.0,1923.0 1625.0,1741.4 1625.0,1660.0 1624.8,1585.0 1594.2,1208.9 1568.0,1211.0 1567.0,1163.0 1590.3,1161.2 1576.2,986.5 1515.4,81.1 1477.5,80.4 25.7,55.9 1.0,55.5 1.0,327.4 18.4,543.0 41.6,963.1 97.6,1716.2 96.1,1836.7 106.6,1837.0 109.0,1867.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[50.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2871448262424,38.66701384720721]}},{"type":"Feature","properties":{"resourceCoords":[49.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28599402922943,38.66836549688972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0027__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p27 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6692.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0027__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0027","type":"ImageService3","width":1673,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.8,137.8 61.0,131.6 1.0,143.0 1.0,431.1 9.0,432.0 9.6,462.3 651.4,1929.2 735.0,1930.0 847.0,1923.0 867.6,1923.8 1625.7,1863.8 1633.3,1399.5 1641.8,703.9 1653.4,18.1 740.3,81.1 136.7,131.2 61.8,137.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0027__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[734.0,1020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28243013975361,38.664503088054275]}},{"type":"Feature","properties":{"resourceCoords":[734.0,1966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28061972872311,38.66355728819358]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0028","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"203.8,247.3 400.1,162.8 635.9,60.7 670.1,46.0 683.5,42.8 668.4,41.7 610.4,37.5 603.5,18.1 686.4,23.9 818.9,27.3 1578.3,21.6 1538.6,485.0 1544.0,484.4 1501.2,1253.5 1535.8,1257.9 1530.1,1304.3 1498.6,1300.8 1467.8,1855.2 1421.5,1854.8 1360.6,1856.8 1206.3,1861.6 1073.9,1865.8 1015.8,1870.9 964.9,1875.3 857.6,1901.0 388.4,1466.8 381.0,1209.3 378.1,1105.3 203.8,247.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[868.0,492.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27954240813618,38.66346160920027]}},{"type":"Feature","properties":{"resourceCoords":[701.0,36.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28064653528024,38.66360690997015]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0029","type":"ImageService3","width":1673,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"964.3,1926.9 881.0,1925.0 768.2,1929.4 721.8,1930.0 507.0,1930.0 475.9,1933.2 403.9,1934.1 309.9,1901.4 247.9,1780.3 150.8,1793.4 47.4,1272.0 72.0,1273.0 73.0,1256.0 67.0,1245.0 61.0,1245.0 56.0,1223.0 37.5,1222.4 33.1,1200.3 71.5,68.9 134.9,37.9 135.5,68.1 1543.3,94.2 1560.4,333.3 1632.8,475.8 1642.9,473.1 1646.8,1921.5 1364.0,1921.8 964.3,1926.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[109.0,487.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30218866791562,38.66912307234775]}},{"type":"Feature","properties":{"resourceCoords":[359.0,1906.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30205346026429,38.666548291465624]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0003","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.3,118.9 228.5,68.2 1158.6,76.3 1571.8,145.2 1551.7,957.6 1508.7,957.1 1580.3,1784.0 1113.8,1781.2 187.8,1769.2 157.2,1768.8 159.2,1415.1 53.8,108.5 72.3,118.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[633.0,949.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27937476602956,38.67024805271065]}},{"type":"Feature","properties":{"resourceCoords":[136.0,949.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.280321940047,38.67074611208085]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.71"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0030","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1583.7,1196.2 1587.1,1271.3 1562.0,1273.0 1559.0,1293.0 1562.0,1318.0 1589.2,1316.2 1592.4,1387.3 1601.3,1782.5 1591.2,1870.4 824.0,1879.7 54.5,1883.0 54.3,1720.9 48.8,622.9 50.6,445.6 51.0,205.9 51.9,71.6 1509.0,80.6 1580.3,353.6 1575.2,677.7 1578.3,677.5 1583.7,1196.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2993098224766,38.666139002391006]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29884528207502,38.66903547585555]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29447285058323,38.66860191765585]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29493739098481,38.6657054441913]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0031","type":"ImageService3","width":1673,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1061.9,436.8 1472.1,441.7 1556.2,442.4 1596.5,1562.0 118.2,1571.0 124.0,1560.6 66.7,900.0 114.1,436.4 1061.9,436.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1077.0,820.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29984871149561,38.665588703887614]}},{"type":"Feature","properties":{"resourceCoords":[104.0,1186.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.302191775649,38.66514186030163]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0032","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"140.3,1555.9 98.5,430.0 248.9,431.0 422.7,433.6 1499.0,433.6 1515.5,1003.5 1580.0,1003.9 1585.5,1520.2 1586.3,1545.5 1586.9,1563.1 1025.8,1559.9 750.0,1555.0 432.6,1555.5 417.0,1557.0 416.9,1553.9 140.3,1555.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[368.0,1180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29823213992769,38.66476391972333]}},{"type":"Feature","properties":{"resourceCoords":[368.0,809.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29812855619647,38.66542732057884]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0033","type":"ImageService3","width":1673,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"705.7,1482.2 638.6,1554.0 575.9,1576.5 264.1,1576.3 262.6,1533.2 256.1,1013.7 191.3,1013.4 173.7,440.1 333.6,440.4 858.5,436.6 1133.0,425.3 1439.1,427.4 1493.7,427.8 1577.2,439.0 1554.3,479.3 1357.7,952.4 1229.8,1256.6 799.6,1731.7 792.8,1582.6 704.5,1611.1 704.2,1578.2 705.7,1482.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1352.0,957.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29289774806635,38.66467465559623]}},{"type":"Feature","properties":{"resourceCoords":[1266.0,1158.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29314998216904,38.66433639533501]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0034","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"139.3,1767.7 88.0,1771.0 85.7,1261.4 91.1,1215.7 94.2,1158.5 84.9,1052.8 75.5,850.3 75.3,439.1 78.5,206.8 83.2,187.2 93.6,173.7 125.7,163.1 1057.9,235.1 1559.3,281.2 1600.0,284.9 1600.4,323.6 1605.7,857.7 1612.0,1020.0 1628.9,1092.5 1615.8,1096.2 1571.8,1102.0 990.0,1144.2 851.7,1201.0 853.2,1365.5 860.9,1583.0 139.3,1767.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[467.0,219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29034392968508,38.66676427893545]}},{"type":"Feature","properties":{"resourceCoords":[861.0,1598.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29113957824458,38.66425862134291]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p35","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0035","type":"ImageService3","width":1661,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"252.4,1782.0 260.9,978.2 279.3,978.2 282.9,139.1 299.0,139.2 300.4,147.4 1271.8,122.8 1350.7,167.8 1345.3,1948.0 1342.0,1948.0 1341.4,1940.5 1315.9,1871.3 1229.3,1789.6 252.2,1806.1 252.4,1782.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[281.0,139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3026023,38.662556]}},{"type":"Feature","properties":{"resourceCoords":[1368.0,139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3023272,38.6644826]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.45"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0036","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"323.1,1697.0 318.8,1697.1 318.8,1692.8 318.5,1595.0 274.5,1544.2 275.3,1356.2 258.4,1325.2 268.6,291.0 285.0,291.4 287.0,121.2 287.6,70.1 1257.5,56.3 1343.4,138.2 1368.6,207.4 1370.6,231.7 1367.5,552.1 1359.4,830.5 1349.7,1396.8 1345.5,1709.6 1367.1,1772.9 1437.7,1841.2 1342.0,1838.3 1264.3,1837.9 806.1,1827.3 695.9,1811.3 525.6,1750.0 465.6,1715.2 436.7,1696.2 323.5,1697.0 323.1,1697.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29905620987454,38.66167551307811]}},{"type":"Feature","properties":{"resourceCoords":[1647.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29864658137716,38.66461734297686]}},{"type":"Feature","properties":{"resourceCoords":[1647.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29421943639016,38.66423617144751]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.29462906488753,38.66129434154876]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0037","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"742.0,1930.0 849.0,1924.0 952.4,1925.4 952.8,1908.7 1545.4,1923.2 1526.7,1384.4 1533.4,1384.6 1594.2,791.9 1603.3,579.3 1606.8,368.1 866.3,241.2 817.6,223.2 682.7,525.5 240.9,992.6 237.3,843.0 148.1,869.6 147.5,914.9 133.7,1376.1 116.9,1486.9 54.4,1657.8 19.2,1718.0 1.0,1745.4 1.0,1865.6 120.8,1866.3 118.5,1870.6 176.4,1873.0 157.4,1902.5 605.8,1928.8 742.0,1930.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1608.0,361.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29111829886799,38.66429442638047]}},{"type":"Feature","properties":{"resourceCoords":[1608.0,793.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29121805680631,38.66352743938916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p38","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0038","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1266.2,1922.7 1192.0,1921.0 1128.8,1923.0 334.8,1919.5 305.6,1383.8 312.2,1383.8 360.9,792.9 365.8,581.2 365.0,371.0 443.0,166.8 505.9,14.2 656.0,15.8 1210.4,204.3 1253.3,216.2 1269.2,218.2 1264.4,804.6 1270.0,1383.0 1265.8,1759.7 1266.2,1918.2 1266.2,1922.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[365.0,371.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2911227,38.6642821]}},{"type":"Feature","properties":{"resourceCoords":[1270.0,1383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2893405,38.6622844]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p39","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0039","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"66.7,1799.8 65.8,1530.0 68.0,1530.0 69.0,1485.0 65.6,1484.8 61.0,137.1 140.9,136.8 800.2,140.7 832.9,140.5 991.7,140.0 1369.0,144.0 1648.7,141.2 1647.3,1200.4 1639.5,1200.3 1642.8,1801.4 1363.3,1801.2 797.0,1802.0 300.3,1799.1 94.1,1799.7 66.7,1799.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[797.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2870013,38.6610294]}},{"type":"Feature","properties":{"resourceCoords":[797.0,1802.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.285727,38.6609077]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0004","type":"ImageService3","width":1631,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"69.3,949.8 112.3,949.9 124.5,136.0 1176.5,77.2 1392.7,145.8 1397.0,956.1 1463.0,955.7 1535.9,1775.0 612.5,1782.8 149.0,1777.1 69.3,949.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[548.0,952.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27681426771646,38.66886917759464]}},{"type":"Feature","properties":{"resourceCoords":[1500.0,1780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27609110122815,38.66668083714244]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p40","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0040","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"919.5,142.4 993.1,155.1 1145.2,212.6 1640.1,416.1 1646.0,418.5 1646.0,480.0 1628.0,480.0 1625.0,489.0 1625.7,526.8 1401.5,955.6 1043.5,1626.5 993.8,1656.0 962.7,1654.1 1083.7,1861.4 1086.5,1862.5 1054.7,1925.4 963.5,1928.1 969.8,1816.4 879.9,1800.3 624.6,1797.4 35.4,1796.7 29.0,1796.7 25.9,1198.0 33.6,1198.0 35.5,142.9 334.0,140.0 919.2,144.7 919.5,142.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[334.0,1198.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2867757,38.6630851]}},{"type":"Feature","properties":{"resourceCoords":[334.0,140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2891927,38.6633152]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p41","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0041","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"73.8,983.1 72.5,388.4 74.6,130.7 90.5,39.9 224.4,47.0 224.3,16.8 324.6,16.2 396.5,52.2 401.5,44.6 429.0,57.7 1623.7,120.5 1624.4,685.9 1630.7,1271.2 1632.5,1271.2 1632.2,1843.9 1200.7,1845.6 77.0,1840.0 75.9,1584.9 81.0,1585.0 83.0,1542.0 75.7,1541.3 74.5,1270.6 73.8,983.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[77.0,1840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.285727,38.6609077]}},{"type":"Feature","properties":{"resourceCoords":[77.0,96.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2852324,38.6639886]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p42","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0042","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"526.1,1831.2 456.9,1838.5 56.0,1839.3 57.4,1272.7 55.6,1272.7 50.5,693.7 50.9,134.3 488.0,158.2 514.2,106.2 518.8,106.3 519.2,143.6 519.5,159.8 522.7,400.6 525.1,614.3 1384.4,784.0 1501.2,828.9 1498.5,1288.2 1522.9,1293.2 1503.4,1835.9 526.1,1831.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1159.0,1843.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2796877,38.6603066]}},{"type":"Feature","properties":{"resourceCoords":[526.0,694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2808113,38.6624984]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0043","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"959.0,582.1 976.5,472.1 1009.7,366.8 1112.0,95.9 1133.7,38.4 1135.2,34.6 1562.0,252.0 1558.8,259.6 1629.5,296.1 1639.8,1786.1 155.0,1783.1 173.2,1235.5 148.6,1230.5 149.9,767.1 373.1,852.0 959.0,582.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1565.0,234.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27525874630125,38.66266986399542]}},{"type":"Feature","properties":{"resourceCoords":[622.0,1784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27783968567826,38.6601373499437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p44","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0044","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1520.0,1780.0 1520.0,1783.6 80.4,1765.5 67.9,310.0 415.5,489.2 421.3,475.4 1523.6,1014.2 1522.2,1034.0 1520.3,1599.8 1520.0,1780.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-2.0,274.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27528,38.662626]}},{"type":"Feature","properties":{"resourceCoords":[1520.0,1780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2722345,38.6595837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0045","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"896.1,33.8 1500.5,17.8 1525.1,359.3 1521.5,358.2 1509.0,1025.0 1527.8,1023.9 1563.6,1332.9 1551.9,1615.6 1562.9,1621.2 1516.2,1912.7 1494.2,1899.3 490.9,1934.2 490.2,1929.0 262.4,1931.0 196.7,1931.0 124.0,1931.0 58.9,1754.3 106.9,1701.6 108.5,1680.8 60.0,1549.1 97.1,480.8 50.4,153.4 177.9,36.5 638.2,69.4 895.8,17.9 896.1,33.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[451.0,1401.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30405885130399,38.66024346290417]}},{"type":"Feature","properties":{"resourceCoords":[620.0,113.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30325566426765,38.66248881950282]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p46","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0046","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"89.3,1922.4 134.3,1634.1 123.4,1628.6 133.8,1349.0 97.1,1043.7 78.5,1044.9 88.2,385.6 91.8,386.6 66.0,49.2 292.7,42.2 293.4,60.3 1082.8,40.9 1156.7,39.1 1324.0,35.0 1329.4,519.1 1331.0,735.0 1465.2,770.5 1509.1,1384.7 1483.1,1521.8 1418.0,1803.3 1414.2,1891.1 1402.5,1920.8 826.5,1919.8 721.9,1878.1 687.5,1893.7 155.3,1929.2 99.1,1928.3 89.3,1922.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[689.0,1865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3004029,38.6590087]}},{"type":"Feature","properties":{"resourceCoords":[1331.0,735.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.298544,38.6608686]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p47","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0047","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"185.2,1866.9 261.6,1869.8 262.1,1882.2 1442.5,1897.8 1377.6,1774.4 1274.3,1570.5 1242.0,1486.9 1208.6,1360.4 1190.6,1209.0 1189.9,1140.3 1204.8,987.9 1245.1,798.7 1248.3,780.8 1258.4,734.3 1251.4,680.3 1263.3,566.0 1284.0,465.2 1318.0,364.8 1392.8,252.8 1431.3,211.4 1563.9,96.2 1623.7,13.3 1630.3,1.0 1409.9,1.0 1361.0,43.5 1175.6,42.2 1145.0,58.9 125.6,45.7 112.5,514.7 105.6,731.1 238.7,772.0 258.5,1389.1 227.1,1525.5 150.8,1805.0 143.5,1892.8 182.5,1849.0 185.2,1866.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[112.0,750.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29853388941673,38.66083336872417]}},{"type":"Feature","properties":{"resourceCoords":[112.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29836301553973,38.66207709345152]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0048","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1370.5,1907.3 248.3,1911.4 129.2,1911.6 105.0,1276.4 129.7,1276.2 59.9,87.9 1204.1,76.7 1345.0,329.9 1485.2,581.9 1557.8,712.2 1449.3,1546.1 1431.0,1545.9 1397.3,1545.5 1336.3,1543.3 1584.3,1908.6 1370.5,1907.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1278.0,1534.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29602644622719,38.65579361728859]}},{"type":"Feature","properties":{"resourceCoords":[2254.0,1918.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29383046353998,38.65484649974714]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p49","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0049","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"301.9,1841.8 191.1,1634.4 155.9,1549.2 118.8,1419.9 96.8,1264.7 94.5,1194.0 106.4,1036.9 143.6,841.5 144.8,833.5 146.4,823.0 155.8,775.0 147.3,719.6 157.0,601.8 176.1,497.7 208.8,393.6 283.1,276.9 321.8,233.4 455.5,112.0 515.0,25.4 519.9,15.9 578.7,16.7 560.2,47.2 1015.5,61.3 1153.5,58.6 1366.6,48.0 1366.6,58.3 1509.4,57.5 1498.2,1912.1 409.2,1906.6 341.4,1912.9 301.9,1841.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1237.0,1217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2935987,38.6596241]}},{"type":"Feature","properties":{"resourceCoords":[1237.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2932632,38.6616454]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p5","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0005","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"898.3,1811.6 437.0,1802.0 366.6,968.5 299.4,968.6 298.8,144.5 328.6,154.1 1167.5,147.9 1250.5,202.1 1305.0,974.0 1374.8,1811.3 898.3,1811.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[437.0,1802.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2760168,38.6666517]}},{"type":"Feature","properties":{"resourceCoords":[1305.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2733469,38.6669964]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p50","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0050","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1519.3,725.4 1519.2,68.3 1518.9,40.2 1444.7,39.1 1381.7,41.5 1.0,44.8 1.0,71.4 139.9,70.7 127.5,1849.9 162.1,1849.3 162.3,1877.5 1523.9,1880.9 1523.8,1859.1 1520.2,1235.5 1520.3,816.2 1519.3,725.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[968.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2907644,38.6613978]}},{"type":"Feature","properties":{"resourceCoords":[1520.0,1202.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2898374,38.6592546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0051","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.6,1789.7 1296.2,1791.5 1288.4,1791.7 1260.4,1791.6 645.2,1791.2 361.6,1794.5 62.3,1798.5 18.4,1798.8 18.6,1756.4 17.2,1253.6 17.1,633.1 27.9,468.3 28.7,367.8 19.5,161.4 19.4,126.3 50.9,126.0 228.8,127.6 635.6,131.7 1262.7,130.2 1611.7,129.6 1613.6,1789.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[642.0,1805.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28656048443217,38.65534929839971]}},{"type":"Feature","properties":{"resourceCoords":[642.0,124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29041261497221,38.65572703575077]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p52","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0052","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1447.5,132.0 1464.1,1778.8 1435.2,1779.1 670.4,1789.0 395.4,1791.0 60.7,1794.0 53.1,137.6 67.5,137.5 355.1,136.2 400.0,136.0 1019.7,132.1 1436.4,132.1 1447.5,132.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[400.0,1791.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2862224,38.6577003]}},{"type":"Feature","properties":{"resourceCoords":[400.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2900215,38.6580831]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p53","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0053","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"81.7,775.9 82.0,570.0 87.2,74.1 1203.0,88.1 1589.9,89.5 1584.0,582.0 1588.6,582.0 1597.4,849.0 1588.7,849.0 1578.9,1894.9 82.0,1900.0 82.0,1880.6 83.0,1603.5 81.6,832.4 81.7,775.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[82.0,570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2858718,38.6600258]}},{"type":"Feature","properties":{"resourceCoords":[82.0,1876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2862224,38.6577003]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p54","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0054","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"600.5,1863.8 563.1,1863.8 562.9,1896.6 48.1,1894.7 56.4,829.0 65.0,829.0 55.8,564.0 51.2,563.9 56.3,74.9 497.1,75.7 566.1,68.7 1486.3,76.8 1567.3,83.8 1567.4,842.5 1580.5,1212.6 1587.7,1212.7 1572.3,1875.1 1532.9,1876.3 1530.0,1874.7 600.5,1863.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[562.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2814539,38.6584256]}},{"type":"Feature","properties":{"resourceCoords":[1197.0,83.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2796877,38.6603066]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p55","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0055","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"434.8,1893.6 402.5,1880.8 101.2,1879.7 111.6,1208.0 104.4,1208.0 88.2,833.0 82.2,64.0 1541.9,59.3 1541.8,40.8 1613.8,41.7 1601.3,834.8 1613.5,834.8 1597.7,1874.5 1523.0,1875.1 1522.9,1888.7 1386.5,1887.2 1386.5,1919.0 434.8,1893.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[442.0,1207.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2783524,38.6581253]}},{"type":"Feature","properties":{"resourceCoords":[442.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.278023,38.6601485]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p56","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0056","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.9,1891.4 1444.8,1851.2 1444.3,1430.6 1443.5,838.7 1444.8,162.8 1443.8,79.8 83.8,65.8 73.8,844.2 85.8,844.2 73.3,1864.7 1.0,1865.4 1.0,1878.8 1444.9,1891.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1444.0,1205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2725725,38.6575522]}},{"type":"Feature","properties":{"resourceCoords":[1444.0,586.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2723868,38.6586662]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p57","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0057","type":"ImageService3","width":1648,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"764.0,1737.0 749.3,1742.4 555.9,1738.0 522.1,1738.2 275.0,1746.3 220.9,1744.8 220.9,1739.6 218.6,1142.6 218.2,460.9 216.8,373.5 216.3,192.8 1410.7,193.1 1414.3,598.8 1449.7,599.3 1450.8,643.9 1414.9,643.9 1415.6,981.2 1421.0,1486.3 1419.2,1732.6 1419.0,1746.6 1314.7,1742.8 1146.3,1747.1 1023.6,1741.6 847.4,1743.8 845.2,1736.6 764.0,1737.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[220.0,1512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2725725,38.6575522]}},{"type":"Feature","properties":{"resourceCoords":[1416.0,731.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2696039,38.6586621]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p58","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0058","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"199.7,443.9 196.3,20.7 251.0,22.0 500.6,12.7 534.6,12.4 730.0,16.0 744.0,14.0 744.8,10.5 826.9,9.7 829.0,17.0 1007.0,14.0 1131.0,19.0 1301.0,14.0 1406.4,17.4 1405.2,298.5 1402.1,588.9 1406.8,939.1 1411.8,1604.7 1412.2,1925.7 1368.0,1925.7 1222.0,1922.0 1083.5,1926.0 887.1,1926.1 211.8,1926.8 207.7,1422.4 182.5,1423.0 181.0,1369.2 207.2,1368.5 201.0,598.0 199.7,443.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[201.0,598.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2728093,38.6561166]}},{"type":"Feature","properties":{"resourceCoords":[1409.0,1284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2702914,38.6546135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0059","type":"ImageService3","width":1648,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"42.9,1482.0 38.0,971.8 37.8,631.0 74.0,631.0 73.0,586.0 37.3,585.4 34.1,175.7 83.1,175.7 110.7,176.0 113.3,176.0 1278.5,181.1 1559.1,182.3 1610.7,182.5 1609.0,453.2 1603.5,719.5 1602.3,974.7 1604.5,1230.7 1605.5,1738.4 716.6,1734.0 647.6,1736.6 40.5,1740.8 40.6,1730.7 42.9,1482.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1592.0,1736.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26639323990767,38.656505434320785]}},{"type":"Feature","properties":{"resourceCoords":[1592.0,182.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26593134602676,38.65924998921095]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0006","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"990.2,1807.6 879.5,1806.5 879.2,1803.7 405.3,1796.7 331.7,972.4 273.7,212.4 350.6,150.7 812.4,116.3 1183.5,162.8 1190.6,152.1 1219.0,237.9 1288.2,971.5 1355.3,1799.7 990.2,1807.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[342.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27332451402528,38.66698943817575]}},{"type":"Feature","properties":{"resourceCoords":[1301.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27151631162614,38.66601588283168]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0060","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"34.2,1239.0 29.9,986.9 28.9,735.4 32.1,473.1 31.4,206.5 1563.4,193.7 1599.5,258.9 1556.4,596.3 1595.0,1735.7 39.4,1739.1 34.2,1239.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[54.0,1239.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26616927050435,38.65738996568797]}},{"type":"Feature","properties":{"resourceCoords":[54.0,201.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26583582825427,38.65924884988611]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0061","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"59.2,19.6 661.0,16.0 729.4,13.6 1610.7,18.6 1607.8,597.8 1607.3,1285.8 1605.0,1918.0 52.9,1915.7 54.4,1597.4 53.7,937.5 52.0,685.0 74.0,685.0 75.0,665.0 88.0,661.0 89.0,642.0 83.0,636.0 51.6,638.8 51.3,590.3 56.2,302.4 59.2,19.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1598.0,1287.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26676995113036,38.65424087539774]}},{"type":"Feature","properties":{"resourceCoords":[1598.0,33.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26639645057723,38.65647536070459]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0062","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.6,1277.9 29.5,598.0 33.4,25.6 74.3,26.0 76.0,27.0 226.0,30.0 272.8,27.8 1580.4,39.7 1594.9,686.0 1594.0,686.0 1592.0,733.0 1596.0,733.0 1610.4,1375.1 1611.1,1846.2 1562.2,1909.5 24.1,1902.8 27.6,1277.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[109.0,599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26635881455503,38.65544644217274]}},{"type":"Feature","properties":{"resourceCoords":[-68.0,1897.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26715281167067,38.653146618610876]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0063","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.7,15.5 246.6,21.8 471.9,30.1 472.4,35.3 1466.0,46.2 1574.8,119.5 1608.8,138.6 1531.3,685.8 1493.2,660.9 1485.5,857.7 1503.4,1103.2 1526.5,1248.5 1562.2,1420.4 1526.8,1927.3 1495.2,1926.3 1111.3,1913.4 567.7,1899.8 27.7,1882.4 28.0,1880.0 32.0,1879.0 29.9,1862.0 30.9,1853.5 33.0,1853.0 33.0,1834.0 25.0,1822.0 4.0,1822.0 15.6,1808.0 20.0,1808.0 31.0,1801.0 31.0,1789.2 47.1,1789.2 63.9,1653.1 108.4,1633.8 47.3,1325.8 44.8,736.0 74.0,736.0 76.0,689.0 44.6,686.6 42.5,190.2 117.8,40.9 110.1,16.7 109.7,15.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[960.0,331.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30308025212139,38.658667530322845]}},{"type":"Feature","properties":{"resourceCoords":[1617.0,1902.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30191171958299,38.655717881317806]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p64","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0064","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.8,1914.5 124.3,1409.6 82.9,1240.0 54.8,1096.5 28.5,853.2 29.3,657.5 68.0,680.8 126.0,134.6 91.5,116.8 18.9,71.5 598.0,41.5 632.5,26.5 736.1,69.6 1309.2,79.1 1321.3,49.7 1354.9,10.0 1357.0,10.0 1357.3,7.2 1358.9,5.3 1362.0,23.0 1438.0,23.9 1511.8,1253.1 1486.5,1253.3 1512.2,1903.8 1223.1,1904.8 1150.0,1905.0 583.0,1910.8 312.7,1911.1 150.2,1914.5 106.8,1914.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1150.0,1905.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2997071,38.6554561]}},{"type":"Feature","properties":{"resourceCoords":[600.0,13.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3004029,38.6590087]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0065","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"379.0,21.1 545.7,332.4 755.2,723.4 631.5,1567.0 578.8,1565.5 517.0,1562.3 757.8,1929.5 841.0,1929.5 986.2,1929.3 1118.8,1902.0 1415.3,1908.0 1444.2,1910.1 1471.7,1912.1 1499.0,1913.1 1506.7,1913.4 1518.7,1.0 1485.0,1.0 1484.2,37.2 443.9,16.1 379.0,21.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[433.0,1564.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29608842740996,38.655776676175776]}},{"type":"Feature","properties":{"resourceCoords":[1390.0,1906.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29393679232082,38.65495083719697]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0066","type":"ImageService3","width":1637,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1421.2,1916.3 1008.5,1915.5 806.6,1916.0 675.8,1915.2 471.6,1913.8 146.3,1911.2 145.7,32.8 1468.0,46.4 1466.9,350.2 1464.3,1316.0 1456.3,1916.8 1421.2,1916.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1463.0,1313.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29039914161898,38.655719552215594]}},{"type":"Feature","properties":{"resourceCoords":[1463.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29004143125654,38.65803323521453]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0067","type":"ImageService3","width":1637,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1175.4,1910.6 842.5,1912.8 311.6,1915.5 106.2,1916.5 96.0,1303.5 93.6,674.5 87.1,47.2 1542.5,24.3 1548.0,1909.3 1355.1,1910.0 1175.4,1910.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[97.0,1301.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28658812658699,38.655362611237386]}},{"type":"Feature","properties":{"resourceCoords":[97.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28620482039598,38.657661169910526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0068","type":"ImageService3","width":1637,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"164.4,1907.5 140.0,1907.4 145.5,62.3 645.9,61.9 646.0,30.0 682.3,29.8 1464.8,35.2 1483.7,567.1 1503.5,566.9 1466.9,1303.8 1343.8,1303.8 1409.5,1910.8 1146.7,1909.1 164.4,1907.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[647.0,1306.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28200276557962,38.65489730922204]}},{"type":"Feature","properties":{"resourceCoords":[647.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28163803449046,38.65719031422226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0069","type":"ImageService3","width":1637,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"131.4,1924.4 60.0,1308.2 185.1,1307.3 216.5,558.4 196.4,558.8 173.0,18.5 197.5,18.4 299.0,20.0 350.6,18.3 631.5,18.1 663.1,30.4 1590.4,50.7 1592.6,599.3 1604.1,1186.2 1594.8,1186.4 1619.8,1871.0 1572.6,1869.0 1573.3,1912.9 668.9,1920.9 131.4,1924.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[656.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27893914573234,38.6548063127698]}},{"type":"Feature","properties":{"resourceCoords":[1606.0,662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27657120486013,38.65554324513115]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0007","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1563.2,1805.7 1455.8,1803.8 1453.5,1805.8 1198.7,1799.3 652.4,1799.7 649.6,1854.6 610.4,1853.4 607.1,1799.7 192.8,1799.9 126.8,971.0 58.5,236.9 30.2,151.0 68.2,94.0 385.8,49.8 725.9,118.2 1177.2,55.2 1579.9,185.0 1575.0,972.6 1566.8,1570.7 1633.5,1782.4 1629.1,1783.9 1563.2,1805.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1570.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26882154265395,38.66456396519483]}},{"type":"Feature","properties":{"resourceCoords":[1570.0,1796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26989004616284,38.66335045294157]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0070","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1611.2,1919.0 1589.0,1919.0 1588.0,1924.0 1555.0,1926.0 1554.7,1926.5 81.0,1860.4 58.3,1181.7 67.6,1181.5 58.1,599.7 57.7,25.0 1611.5,40.8 1611.4,150.2 1611.3,894.6 1586.0,895.0 1587.0,947.0 1611.3,946.6 1611.2,1434.0 1611.4,1743.2 1611.2,1919.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[47.0,656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27662607033808,38.65555968637493]}},{"type":"Feature","properties":{"resourceCoords":[53.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27642785909194,38.656675847223426]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p71","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0071","type":"ImageService3","width":1632,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"271.9,137.8 301.6,148.8 298.2,197.8 843.8,194.9 1392.9,188.0 1510.1,187.5 1472.0,755.5 1524.5,738.1 1535.5,735.9 1420.4,1495.5 1379.5,1546.8 1355.2,1620.2 1340.6,1712.7 732.6,1712.0 359.0,1726.4 430.7,1702.2 377.4,1588.0 395.5,425.7 326.3,306.1 205.2,307.3 134.0,172.8 155.8,109.2 297.9,103.7 271.9,137.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[793.0,1292.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3047883,38.6539643]}},{"type":"Feature","properties":{"resourceCoords":[428.0,196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3052841,38.6560019]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p72","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0072","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"20.6,1716.5 18.9,1706.8 34.4,1614.8 59.2,1542.0 100.4,1491.3 221.8,735.9 210.9,738.0 158.4,754.9 201.5,189.7 471.0,190.9 546.8,191.4 711.2,189.1 984.6,190.5 1558.3,188.3 1558.7,433.9 1554.0,703.8 1550.0,1190.1 1550.9,1702.0 1550.6,1756.7 1550.6,1766.4 20.6,1716.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1548.0,1467.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30009775770256,38.6531708771908]}},{"type":"Feature","properties":{"resourceCoords":[1548.0,203.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29973483854371,38.65543222112177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p73","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0073","type":"ImageService3","width":1632,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"727.3,23.1 1338.5,22.7 1361.9,156.8 1433.5,283.4 1465.5,303.7 1511.7,984.9 1452.6,966.5 1446.7,1549.9 1489.1,1556.3 1499.3,1867.8 1444.9,1866.3 1366.6,1907.2 1253.7,1862.0 735.2,1917.1 83.2,1831.4 45.2,997.1 52.0,997.0 53.0,954.0 43.2,953.6 37.0,815.8 90.1,589.1 127.1,637.0 125.0,115.0 351.8,38.3 727.3,23.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0073/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.30669562445517,38.65344846265612]}},{"type":"Feature","properties":{"resourceCoords":[1632.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.30299750009559,38.65305420131983]}},{"type":"Feature","properties":{"resourceCoords":[1632.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.3035961774919,38.64958079004926]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.30729430185148,38.649975051385546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0074","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.1,1555.8 132.0,1549.4 135.8,967.8 194.3,986.0 146.1,307.1 114.4,286.9 43.0,160.8 21.1,36.7 1551.1,67.1 1552.4,253.0 1561.2,1039.1 1565.8,1558.2 1574.3,1924.6 1564.2,1925.0 1563.5,1900.8 185.3,1866.2 174.1,1555.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1544.0,1038.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30050121875617,38.65090162987151]}},{"type":"Feature","properties":{"resourceCoords":[1544.0,1599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30067874309321,38.64989922609886]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0075","type":"ImageService3","width":1632,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.6,1889.8 38.1,1889.8 39.9,1611.1 51.5,1593.8 51.6,1061.6 57.0,1062.0 61.0,1057.0 61.0,1008.0 51.6,1008.0 51.7,32.4 563.8,33.6 1050.4,39.7 1320.5,45.5 1566.1,46.0 1565.5,120.0 1562.5,536.1 1556.0,1699.3 1552.3,1937.4 1045.5,1925.7 1045.8,1893.7 632.0,1888.8 631.0,1900.8 542.3,1898.7 542.4,1916.6 50.6,1910.0 50.6,1889.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[551.0,1632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29635548382231,38.653296547320124]}},{"type":"Feature","properties":{"resourceCoords":[1558.0,1632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2960761180001,38.65509807164825]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0076","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.1,797.9 56.3,1294.0 65.1,1428.9 87.9,1546.2 111.2,1622.2 116.4,1712.5 106.2,1713.5 108.0,1846.5 118.4,1867.7 249.4,1865.0 227.0,1835.8 191.2,1783.7 1568.4,1728.7 1571.4,1921.9 1631.8,1917.0 1628.5,1693.1 1624.5,1482.2 1620.6,1105.3 1579.0,1106.0 1580.0,1060.0 1620.1,1057.8 1617.7,824.6 1618.2,784.6 1618.5,756.2 1621.4,697.5 1620.5,389.0 1589.0,251.7 1583.3,21.4 1576.0,36.0 1060.2,32.5 1060.0,19.1 995.0,20.0 992.0,11.0 980.0,8.0 980.0,1.0 686.7,1.0 638.9,1.9 638.0,14.0 547.8,13.4 548.1,31.6 47.7,33.0 61.1,797.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[566.0,926.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2936908389244,38.653034852900646]}},{"type":"Feature","properties":{"resourceCoords":[1556.0,448.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29445869846336,38.65488730607564]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0077","type":"ImageService3","width":1641,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.2,212.7 203.9,160.1 1572.4,140.4 1570.5,332.3 1630.6,329.0 1628.4,534.6 1627.5,570.9 1627.2,606.4 1633.6,815.1 1631.3,916.7 1618.1,1083.3 1609.7,1710.6 1607.2,1932.2 1569.0,1932.3 1539.0,1932.5 1540.3,1775.3 102.2,1790.0 64.2,1707.1 74.6,1706.9 103.1,1373.4 65.0,1372.7 230.1,527.7 308.6,436.4 308.2,299.4 272.9,260.3 238.2,212.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,1364.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28905345741231,38.65258424115549]}},{"type":"Feature","properties":{"resourceCoords":[1556.0,1364.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28880413730566,38.65432861831019]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0078","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1004.2,1684.9 225.4,1680.8 125.8,1680.3 78.8,172.3 1557.0,137.9 1558.0,297.6 1626.8,296.4 1626.9,313.5 1558.1,314.4 1561.0,631.8 1627.7,631.3 1628.4,1105.2 1576.0,1107.0 1575.0,1155.0 1628.5,1155.0 1629.2,1685.0 1004.2,1684.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0078/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28861803659454,38.65151840843735]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2881546669859,38.654421656915765]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28380733744407,38.65399249925171]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28427070705271,38.65108925077329]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p79","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0079","type":"ImageService3","width":1641,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1460.7,1665.3 1462.1,1756.0 1189.2,1759.0 1149.7,1735.1 1147.2,1688.6 1033.2,1682.2 1033.2,1665.7 540.9,1670.8 541.1,1732.6 219.0,1733.0 199.7,1727.9 189.9,1718.8 49.2,1701.4 49.2,1697.8 48.6,1576.6 45.7,830.7 40.4,232.2 106.2,231.2 503.1,228.3 1491.5,220.5 1640.0,220.0 1639.6,272.2 1634.0,1642.4 1604.1,1642.8 1603.9,1670.3 1460.7,1665.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1020.0,1692.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2825664236196,38.65109450546979]}},{"type":"Feature","properties":{"resourceCoords":[471.0,1694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28385321890646,38.651225393189705]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0008","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.5,573.4 80.4,18.2 301.3,20.9 864.0,214.7 1607.0,464.3 1586.9,491.9 1586.6,709.3 1564.0,710.0 1563.0,756.0 1586.5,756.0 1585.5,1423.5 1513.8,1687.0 1550.9,1840.5 1132.9,1911.5 1130.6,1890.2 681.8,1889.8 82.9,1883.2 81.4,767.3 77.4,747.9 46.6,589.4 50.6,575.6 71.5,573.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[661.0,1882.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26526318156499,38.663367477535395]}},{"type":"Feature","properties":{"resourceCoords":[892.0,211.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26880305018388,38.664608003998325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0080","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.8,250.9 30.9,1656.2 1.0,1656.9 1.0,1685.2 1443.8,1722.8 1443.4,1701.3 1654.0,1700.0 1654.0,1513.0 1645.0,1512.0 1645.0,1494.0 1654.0,1493.0 1654.0,1456.0 1645.0,1455.0 1645.0,1408.0 1654.0,1407.0 1654.0,1403.0 1645.0,1402.0 1645.0,1382.0 1654.0,1381.0 1654.0,1343.0 1644.0,1342.0 1644.0,1324.0 1654.0,1323.0 1654.0,1317.0 1644.0,1316.0 1644.0,1300.0 1654.0,1299.0 1654.0,1284.0 1642.0,1283.0 1642.0,1243.0 1654.0,1242.0 1654.0,1226.0 1641.0,1225.0 1641.0,1205.0 1582.0,1205.0 1583.0,1160.0 1641.0,1159.0 1642.0,1153.0 1654.0,1153.0 1654.0,747.5 1647.9,376.7 1652.8,362.2 1645.6,194.4 1634.3,125.3 1621.0,124.9 1622.1,169.5 697.1,186.9 698.4,238.6 27.8,250.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0080/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28065195175776,38.65399446345305]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.27690146082894,38.65357758956466]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.27752568352544,38.650103980501946]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28127617445426,38.65052085439034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0081","type":"ImageService3","width":1641,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"25.0,1712.0 25.0,1723.6 1440.0,1753.0 1412.5,1779.8 1612.4,1783.2 1615.1,1603.6 1634.1,334.5 1634.3,262.3 1634.8,223.8 13.4,128.7 23.0,199.0 26.0,369.0 25.0,381.0 20.6,383.6 18.5,620.0 31.0,620.0 31.0,759.0 25.0,763.0 17.3,762.4 17.1,778.0 29.0,778.0 24.0,1026.0 19.0,1030.0 19.0,1042.0 24.0,1044.0 24.0,1081.0 10.2,1081.6 10.1,1083.3 24.0,1084.0 23.0,1131.0 10.0,1132.0 10.0,1136.0 21.0,1137.0 24.0,1171.0 50.0,1172.0 49.0,1216.0 24.0,1217.0 23.0,1234.0 6.3,1234.0 6.0,1244.5 25.0,1243.0 25.0,1286.0 5.0,1286.8 4.6,1303.0 24.0,1303.0 26.0,1339.0 3.7,1339.0 3.2,1355.0 27.0,1355.0 27.0,1384.0 2.5,1385.8 2.4,1390.3 9.0,1391.0 9.0,1401.0 15.0,1402.0 18.0,1436.0 1.2,1437.9 1.0,1444.5 1.0,1454.0 25.0,1455.0 24.0,1490.0 9.0,1491.0 14.0,1495.0 14.0,1503.0 25.0,1505.0 24.0,1557.0 6.0,1558.0 5.0,1545.0 1.0,1545.0 1.0,1558.0 24.0,1559.0 24.0,1610.0 24.0,1612.0 24.0,1694.0 25.0,1712.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1620.0,949.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2735677162053,38.651585238521676]}},{"type":"Feature","properties":{"resourceCoords":[1620.0,1701.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27376275895273,38.65025701437983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p82","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0082","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"28.6,366.3 26.6,54.7 684.1,55.5 1010.1,52.3 1195.3,56.3 1195.5,368.5 1198.7,680.6 1628.5,680.0 1628.8,739.2 1603.2,739.2 1615.4,1208.9 1581.0,1210.0 1582.0,1258.0 1616.7,1256.8 1633.2,1891.8 1333.0,1892.2 36.7,1894.0 30.9,661.0 29.7,590.9 28.6,366.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[54.0,1299.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27352234473457,38.651504908514916]}},{"type":"Feature","properties":{"resourceCoords":[1191.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27049394429802,38.65347442616472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p83","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0083","type":"ImageService3","width":1606,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1597.6,58.5 1591.0,753.7 1584.4,753.6 1560.2,1920.6 473.1,1907.8 471.6,1907.8 463.5,1264.1 428.4,1264.8 428.0,1216.1 462.9,1215.5 457.0,739.3 482.9,739.7 483.4,679.7 47.8,674.4 48.9,358.0 52.9,41.6 1597.6,58.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0083/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[472.0,1898.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27003628309983,38.65006138131222]}},{"type":"Feature","properties":{"resourceCoords":[1590.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26695547853913,38.653140713496136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p84","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0084","type":"ImageService3","width":1668,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1626.3,1762.1 1628.8,1905.8 1568.5,1883.6 1480.4,1885.3 1455.9,1899.9 38.9,1906.2 44.1,742.1 50.8,742.1 46.1,49.0 1590.6,42.2 1581.8,53.8 1636.8,617.7 1603.6,1306.6 1631.9,1731.3 1642.7,1762.2 1626.3,1762.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[67.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26689384853543,38.65310953727804]}},{"type":"Feature","properties":{"resourceCoords":[67.0,704.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26710058745871,38.65193453623463]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0085/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p85","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0085/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0085","type":"ImageService3","width":1606,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"570.5,64.7 1343.5,67.0 1535.8,68.3 1589.6,68.7 1593.8,1602.5 1582.3,1619.5 1581.4,1893.3 1084.8,1895.5 1084.9,1899.8 573.8,1890.5 573.8,1870.9 51.7,1879.9 51.9,1679.0 53.2,1330.8 60.0,1331.0 59.0,1286.0 53.4,1285.8 56.9,351.1 60.1,62.0 570.5,64.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0085/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[52.0,1638.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2969443,38.6495963]}},{"type":"Feature","properties":{"resourceCoords":[1091.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.3003088,38.6518427]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p86","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0086","type":"ImageService3","width":1668,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"48.4,78.5 48.4,62.0 577.1,49.1 577.1,68.9 1094.8,74.7 1094.8,70.3 1610.0,64.4 1618.6,832.4 1610.8,1317.5 1618.6,1449.5 1640.2,1564.3 1656.5,1619.0 1653.0,1620.0 1653.0,1638.0 1662.4,1638.7 1664.0,1669.3 1657.0,1670.0 1657.0,1690.0 1665.1,1690.8 1667.0,1727.0 1657.0,1728.0 1658.0,1858.0 1667.0,1876.8 1667.0,1878.8 584.5,1894.0 584.5,1885.5 62.7,1914.3 62.6,1859.5 52.8,830.8 48.4,78.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1104.0,876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2941899,38.6512454]}},{"type":"Feature","properties":{"resourceCoords":[53.0,876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.294507,38.6493577]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p87","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0087","type":"ImageService3","width":1606,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1420.0,1808.8 991.3,1781.0 989.6,1847.0 948.4,1846.3 101.0,1832.9 80.4,1302.8 89.2,1302.8 92.1,72.8 110.1,59.6 149.0,24.2 285.9,23.5 377.4,101.7 1222.6,264.3 1223.2,226.2 1556.6,253.8 1574.3,1055.2 1572.6,1055.2 1605.0,1784.7 1420.1,1771.7 1420.0,1808.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,489.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2892265,38.6512859]}},{"type":"Feature","properties":{"resourceCoords":[995.0,1307.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2899499,38.6498813]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0088","type":"ImageService3","width":1668,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1581.2,1708.4 1580.0,1791.2 90.2,1683.7 60.7,958.6 62.4,958.6 48.1,172.2 131.1,134.5 131.4,161.6 1616.9,136.2 1616.4,162.7 1607.0,518.7 1600.0,1027.0 1589.5,1395.0 1588.0,1395.0 1588.6,1424.5 1582.1,1652.5 1581.2,1708.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0088/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28846900414203,38.65193304730799]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2846844625271,38.65160200098283]}},{"type":"Feature","properties":{"resourceCoords":[1668.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28517629100564,38.64812407792583]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.28896083262057,38.648455124250994]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p89","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0089","type":"ImageService3","width":1630,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"74.9,1451.0 79.0,1451.0 80.0,1405.0 75.4,1404.7 79.2,1059.0 77.3,557.5 80.4,209.9 223.1,228.4 232.9,237.8 252.5,243.0 339.3,243.4 579.2,244.4 579.4,181.8 1078.8,179.4 1078.8,196.2 1194.3,203.4 1196.5,250.5 1236.5,275.0 1586.4,273.1 1608.5,1009.9 1593.3,1009.9 1589.9,1672.5 1376.8,1673.0 72.4,1676.4 74.9,1451.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1068.0,1012.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28279873424168,38.64963917499461]}},{"type":"Feature","properties":{"resourceCoords":[90.0,1682.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.28525742327533,38.648656002602294]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0009","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.2,289.1 510.3,287.8 811.3,290.4 814.5,12.6 884.0,11.0 949.3,13.5 1124.3,43.2 1418.9,92.2 1284.4,1859.9 1216.2,1900.2 313.4,1858.9 255.0,1813.2 228.9,1827.0 244.2,289.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[246.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26589122167313,38.65924814486492]}},{"type":"Feature","properties":{"resourceCoords":[805.0,288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.26573573152687,38.660247626377114]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0090/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p90","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0090/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0090","type":"ImageService3","width":1668,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"234.7,1673.3 1414.4,1682.1 1571.8,1683.3 1576.6,267.2 1576.7,246.0 1.0,166.8 1.0,259.6 73.7,259.9 88.5,1003.6 73.3,1003.5 63.1,1672.1 234.7,1673.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0090/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1570.0,1677.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27833430169638,38.647999084513685]}},{"type":"Feature","properties":{"resourceCoords":[1570.0,202.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27793521631808,38.650640483380926]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p91","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0091","type":"ImageService3","width":1630,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"124.0,40.4 124.2,75.5 978.0,80.2 1017.6,76.8 1538.3,79.8 1538.4,103.5 1549.0,1873.0 1073.8,1875.1 509.9,1875.2 138.0,1873.0 136.1,1873.0 69.1,1504.1 77.0,1504.0 77.0,1460.0 61.0,1459.0 33.8,1309.3 77.2,113.2 46.8,98.2 124.0,40.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1549.0,1873.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27422,38.6475844]}},{"type":"Feature","properties":{"resourceCoords":[138.0,1873.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2746511,38.6450255]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p92","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0092","type":"ImageService3","width":1668,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1537.6,74.0 1580.0,73.9 1577.9,282.6 1657.3,283.8 1667.0,311.1 1606.5,311.8 1588.9,312.9 1577.6,313.0 1563.5,1701.2 1537.0,1674.5 1535.8,1870.6 266.1,1865.9 165.6,1865.5 128.8,1865.4 128.8,79.7 1537.6,74.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[794.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2740217,38.6487801]}},{"type":"Feature","properties":{"resourceCoords":[794.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2781459,38.6491844]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p93","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0093","type":"ImageService3","width":1630,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"58.8,1559.8 64.0,1560.0 67.0,1514.0 59.9,1513.8 65.3,1288.1 36.0,158.1 32.1,125.2 412.7,129.2 989.9,131.7 1476.2,131.7 1513.5,131.8 1559.9,131.9 1524.2,1737.7 1550.1,1765.9 1217.3,1766.3 746.6,1762.4 53.9,1760.5 58.8,1559.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[53.0,1767.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27091777347188,38.6446929476989]}},{"type":"Feature","properties":{"resourceCoords":[53.0,130.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27463407627961,38.6450613808086]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p94","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0094","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"159.8,137.4 1437.6,128.8 1614.8,127.8 1618.5,1445.2 1618.8,1558.0 1591.0,1558.0 1592.0,1607.0 1618.9,1606.6 1619.3,1751.8 1275.9,1751.0 925.0,1754.0 926.8,1778.4 223.2,1739.3 223.4,1758.2 109.6,1759.3 83.6,1731.5 104.8,137.8 159.8,137.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[925.0,1754.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2702474,38.648804]}},{"type":"Feature","properties":{"resourceCoords":[925.0,132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2739535,38.649198]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p95","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0095","type":"ImageService3","width":1623,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1545.4,1604.8 1529.4,1604.8 1534.5,1714.1 812.0,1713.5 188.0,1713.0 187.4,1603.4 169.3,1603.5 210.3,926.1 186.8,927.7 185.6,589.8 188.0,259.0 1486.9,261.4 1512.3,924.9 1487.0,925.0 1545.4,1604.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[188.0,259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2700366,38.6500436]}},{"type":"Feature","properties":{"resourceCoords":[188.0,1713.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2704888,38.6473477]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p96","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0096","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1500.4,1703.3 1456.8,1697.3 1456.5,1819.8 1095.9,1742.9 201.9,1740.5 197.1,1629.3 213.4,1629.3 207.1,1553.2 156.1,937.9 182.0,937.9 158.4,263.1 1308.5,267.3 1333.0,253.1 1420.3,252.2 1479.8,274.4 1478.8,133.0 1495.1,133.2 1591.7,414.4 1523.8,815.0 1618.5,1320.6 1562.4,1638.4 1591.3,1863.9 1498.8,1906.2 1500.4,1703.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0096/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26724290923495,38.65024055276969]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26337675667705,38.64985057708274]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26395646893339,38.646295438658875]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26782262149129,38.646685414345825]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p97","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0097","type":"ImageService3","width":1623,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"124.0,1022.3 122.5,550.8 118.4,217.5 772.4,213.3 1420.3,209.2 1410.5,897.4 1443.1,897.2 1437.3,1014.4 1408.9,1014.5 1398.7,1724.0 1303.1,1724.8 1299.0,1719.3 1055.2,1722.5 1047.5,1777.0 691.1,1849.2 413.6,1719.7 129.9,1716.1 124.0,1022.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[134.0,983.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.2706932684082,38.645990810633656]}},{"type":"Feature","properties":{"resourceCoords":[134.0,184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.27044307181633,38.64740310210064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p98","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0098","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"154.3,1702.2 173.1,1005.7 201.2,1005.8 208.4,890.9 176.2,890.8 194.4,215.2 1207.0,219.5 1571.7,297.9 1572.3,174.0 1616.3,180.2 1614.3,385.4 1594.0,394.6 1620.8,1558.3 1597.8,1668.8 1595.0,1669.0 1594.7,1683.9 1550.5,1896.4 1128.7,1897.4 1088.8,1820.2 997.0,1809.4 348.0,1861.6 137.5,1805.9 59.8,1701.9 154.3,1702.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0098/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26792296465896,38.647476273284546]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26410132038035,38.647095861094826]}},{"type":"Feature","properties":{"resourceCoords":[1667.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.26466679578589,38.643581523788185]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-90.2684884400645,38.643961935977906]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saint Louis, Missouri | 1951 | sanborn04858_035 p99","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T01:27:28Z","modified":"2026-10-18T01:27:28Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0099","type":"ImageService3","width":1623,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1099.7,33.7 1462.8,32.5 1457.9,323.7 1445.7,1661.7 1444.2,1880.5 1444.3,1883.2 1160.4,1866.2 1160.3,1877.0 1106.7,1883.4 142.3,1848.8 142.3,1848.5 101.2,1844.2 130.2,1715.5 31.5,1197.5 119.4,112.6 207.2,35.0 1077.5,24.0 1099.7,33.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd416m:g4164m:g4164sm:g4164sm_g04858195106:04858_06_1951-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1453.0,1612.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.29696165492128,38.649610683460644]}},{"type":"Feature","properties":{"resourceCoords":[1453.0,40.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.30060109603518,38.64994741276529]}}]}}]}