{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03573_034.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Baltimore, Maryland | 1950 | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"98"},{"label":"placed","value":"95"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef-snap 53, georef 41, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"6 sheet(s) cut into 12 panels"},{"label":"unplaced pages","value":"p1145__2 (tier 1, 39.34059,-76.53468 +/-100m); p1185 (tier 1, 39.35128,-76.53790 +/-508m); p1196__2 (tier 1, 39.35976,-76.53321 +/-215m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1101","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1101","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.4,1967.5 57.6,1457.2 201.8,937.0 216.2,949.8 313.9,536.0 331.6,498.9 470.1,287.9 1008.9,444.7 1027.6,416.1 1404.1,826.3 1212.5,1003.6 1249.6,1085.2 1347.9,1725.3 968.2,1759.0 975.6,1791.3 924.9,1802.0 915.9,1763.2 759.1,1775.7 717.0,1784.4 691.2,1811.9 614.1,1928.7 95.8,1999.8 92.4,1967.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[150.0,1210.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.57373550844952,39.344510041942065]}},{"type":"Feature","properties":{"resourceCoords":[1275.0,949.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.57179223475026,39.3459562604911]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1102","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"897.6,1950.5 858.6,1928.8 676.7,1943.2 616.2,1973.8 351.9,1993.2 162.7,1980.8 582.2,788.7 794.6,182.8 800.2,94.1 1050.5,28.3 1212.5,660.1 1217.6,726.0 1208.2,797.5 1188.9,936.0 1154.5,1184.3 1110.3,1537.0 1106.5,1609.5 1116.8,1851.0 1091.2,1935.3 897.6,1950.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[501.0,1008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.57037333128542,39.34448683453096]}},{"type":"Feature","properties":{"resourceCoords":[1036.0,1962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56779822929018,39.34442328957714]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1103","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1103","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"80.3,1430.0 137.6,907.6 42.6,804.0 22.1,772.2 23.9,729.1 50.0,573.2 90.0,574.0 92.0,522.0 58.7,521.3 118.5,143.2 1393.1,263.7 1400.5,444.3 1366.9,692.1 1388.6,725.1 1348.0,1049.2 1298.7,1021.4 1278.6,1247.6 1281.9,1383.3 1299.7,1508.7 1334.2,1543.1 1369.0,1777.7 1354.5,1818.6 1390.8,2025.0 1387.3,2024.8 1272.7,1841.1 832.5,1900.2 514.1,1826.5 48.0,1425.5 80.3,1430.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,211.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.569646,39.3438162]}},{"type":"Feature","properties":{"resourceCoords":[828.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.572393,39.341727]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1104","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1104","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"830.9,2037.0 813.2,2037.0 784.2,2037.0 352.9,1877.0 236.0,1839.2 162.3,1829.3 167.5,1815.2 68.1,951.0 118.9,176.1 340.6,92.5 557.9,97.6 595.1,119.9 832.3,131.8 872.8,104.7 999.3,111.9 1133.2,135.2 1351.3,199.4 1314.2,242.4 1292.8,302.9 1104.8,834.2 1071.3,971.1 1059.7,1244.5 1333.0,1632.0 1393.4,1715.3 830.9,2037.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[106.0,1165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5699705,39.3393783]}},{"type":"Feature","properties":{"resourceCoords":[1333.0,1632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5674842,39.3407438]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1105","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1105","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"194.6,1337.0 181.7,197.8 469.6,184.5 1005.2,172.0 1124.2,173.2 1145.6,631.1 1163.2,1177.4 1142.3,1175.7 1141.0,1696.0 1126.5,1694.6 1054.3,1687.9 988.3,1695.5 360.0,1882.0 194.6,1337.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[360.0,1882.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5716803,39.346266]}},{"type":"Feature","properties":{"resourceCoords":[186.0,629.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5704104,39.3483383]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1106","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1106","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"171.7,1740.3 166.2,1221.0 187.0,1222.5 162.3,677.5 134.9,220.8 566.1,219.6 1160.3,214.9 1211.7,214.9 1214.3,389.1 1220.7,859.9 1228.8,991.0 1273.0,1386.6 1299.3,1589.5 1280.9,1630.2 1302.8,1798.5 1217.0,1777.1 975.6,1799.8 902.9,1799.7 547.4,1773.3 296.9,1751.5 171.7,1740.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[556.0,1258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56852849471495,39.34610707280419]}},{"type":"Feature","properties":{"resourceCoords":[1177.0,373.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56615674705569,39.34680843435369]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1107","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1107","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1313.8,1894.5 769.1,1907.9 476.3,1921.8 265.7,1926.6 160.7,1223.9 123.0,1224.0 118.1,684.9 279.4,681.1 76.0,150.0 1081.8,126.0 1185.8,125.0 1333.4,125.0 1324.9,658.9 1323.0,658.9 1304.5,659.2 1317.9,1222.2 1333.5,1222.2 1356.0,1894.8 1313.8,1894.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[123.0,1224.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5696607,39.3503814]}},{"type":"Feature","properties":{"resourceCoords":[76.0,150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5683905,39.3520267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1108","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1108","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"683.4,1901.5 168.1,1898.2 144.2,1229.2 128.7,1229.3 114.1,669.5 132.5,669.1 134.3,669.1 141.6,138.1 641.9,137.3 828.1,141.1 860.6,136.5 918.5,101.9 971.0,98.1 1303.0,179.0 1303.2,249.4 1330.0,288.3 1330.0,592.5 1334.6,1224.7 1284.0,1224.8 1285.6,1902.5 683.4,1901.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1108/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[462.0,1228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5667114,39.3488859]}},{"type":"Feature","properties":{"resourceCoords":[462.0,672.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5660006,39.3497171]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1109","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.7,1486.4 106.8,1483.8 133.1,820.4 182.5,822.3 204.0,203.3 488.7,194.4 742.5,195.4 1213.9,185.6 1262.0,187.5 1277.8,941.5 1298.1,941.3 1301.9,1320.8 1294.1,1681.8 151.4,1659.2 157.7,1486.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1109/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[714.0,190.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56317123132276,39.34851713065969]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,1664.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56380015459206,39.34566175145079]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1110/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1110","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1110/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1110","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.6,1325.8 177.7,1285.3 158.5,1078.8 128.2,676.6 124.8,543.6 135.6,66.6 1302.0,72.0 1306.3,261.8 1303.4,750.5 1302.0,1506.0 1230.9,1506.5 798.9,1897.8 1426.0,1905.6 1426.0,1911.6 1426.0,1917.8 221.0,1974.9 219.8,1979.1 187.8,1918.1 170.4,1733.4 191.9,1693.6 173.6,1497.1 157.6,1325.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1110/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1302.0,1506.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5655765,39.3434506]}},{"type":"Feature","properties":{"resourceCoords":[1302.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5638177,39.3456318]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1111/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1111","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1111/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1111","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1340.5,1923.8 1286.0,1275.0 1287.4,840.9 1266.4,846.8 1304.5,376.5 1344.2,369.2 1409.8,358.3 1226.1,28.9 1066.3,25.0 874.9,25.1 780.0,31.2 645.8,40.0 340.8,64.8 122.0,58.1 1.0,74.7 1.0,128.9 314.4,777.8 333.3,768.9 498.7,1121.0 645.4,1460.9 726.1,1633.8 854.5,1930.9 1340.5,1923.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1111/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1195.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56283763108313,39.34496182823895]}},{"type":"Feature","properties":{"resourceCoords":[346.0,755.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5628622745075,39.34678360153322]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1112/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1112","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1112/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1112","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1395.0,2021.8 1341.2,2020.6 1331.2,2020.4 1305.3,1878.0 979.6,1938.9 977.3,1929.2 198.5,1943.5 141.5,1294.3 141.3,859.8 120.3,865.7 156.7,394.9 196.4,387.5 345.7,362.1 709.1,299.4 1120.2,274.4 1183.9,273.4 1209.5,801.0 1230.8,1103.6 1271.2,1372.0 1304.1,1528.4 1361.2,1851.0 1383.0,1955.9 1395.0,2021.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1112/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[47.0,1320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56280101536576,39.34498888992778]}},{"type":"Feature","properties":{"resourceCoords":[1176.0,1029.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56078548133043,39.34361349362749]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1113/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1113","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1113/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1113","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"752.5,1827.9 550.1,1813.6 471.9,1804.0 433.1,1738.0 520.7,1746.6 42.5,63.9 534.3,362.4 554.7,429.5 1269.7,218.2 1422.0,173.9 1422.0,221.8 1290.9,1406.8 1281.1,1408.0 1299.5,1732.7 1157.6,1739.9 1148.2,1801.8 1132.0,1802.6 1140.0,1740.8 845.6,1755.8 844.8,1824.5 752.5,1827.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1113/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.5672208,39.3433676]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.564717,39.3450798]}},{"type":"Feature","properties":{"resourceCoords":[1423.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.5615462,39.3423066]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.56405,39.3405944]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1114/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1114","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.65"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1114/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1114","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"389.4,1654.3 108.7,1517.8 51.6,1490.0 187.6,1197.0 177.1,1159.5 283.5,936.1 331.0,763.8 355.9,575.5 354.0,310.0 355.4,306.0 1255.5,335.6 1248.5,374.0 1409.7,385.7 1374.7,931.4 1363.8,930.4 1383.2,1564.0 1417.8,1625.7 1206.4,1741.7 1007.1,1851.1 740.1,1809.3 609.4,1761.2 389.4,1654.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1114/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[975.0,1845.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5686459,39.3407594]}},{"type":"Feature","properties":{"resourceCoords":[354.0,310.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5682852,39.3437574]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1115/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1115","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1115/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1115","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"950.5,1912.2 72.0,1574.0 88.6,1020.5 89.7,827.3 100.2,525.4 106.2,104.4 337.4,112.8 466.1,166.2 650.1,262.2 1009.0,451.2 1377.5,634.4 1106.2,1185.5 958.2,1456.8 1148.0,1618.0 1152.8,1653.4 1040.8,1948.3 950.5,1912.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1115/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[710.0,1051.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.566603,39.3527747]}},{"type":"Feature","properties":{"resourceCoords":[72.0,1574.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5683905,39.3520267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1116/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1116","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1116/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1116","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"263.4,1565.7 248.4,1515.4 202.3,1466.6 190.9,1435.9 154.5,1254.0 14.3,625.0 338.1,542.9 365.9,517.2 390.2,254.7 715.4,218.2 1358.0,118.5 1385.8,372.4 1371.2,476.2 1335.8,820.0 1316.4,1074.3 1280.7,1386.9 1258.9,1680.5 1150.6,1705.0 1154.4,1721.3 1006.2,1737.5 256.1,1906.0 263.4,1565.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1116/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1162.0,1687.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56258377686456,39.351039385739334]}},{"type":"Feature","properties":{"resourceCoords":[282.0,1905.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56370274401768,39.34965635510059]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1117/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1117","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1117/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1117","type":"ImageService3","width":1423,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1068.3,1831.6 921.0,1843.3 698.5,1946.9 587.0,1706.9 341.8,1201.5 18.1,737.3 453.6,430.3 852.5,153.2 955.0,82.0 1006.0,86.9 1137.3,626.7 1200.1,878.3 1234.8,887.1 1301.6,1641.9 1288.4,1833.7 1068.3,1831.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1117/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1140.0,606.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56489653820547,39.356174388161236]}},{"type":"Feature","properties":{"resourceCoords":[1302.0,1836.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56635799271285,39.35425334624759]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1118/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1118","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1118/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1118","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"792.0,1842.0 364.8,1833.7 379.3,1643.2 318.3,892.9 283.9,883.9 223.2,633.5 96.5,96.3 887.6,300.9 1369.0,422.0 1255.1,896.6 1195.9,1127.7 1235.6,1138.2 1232.2,1181.5 1225.7,1522.3 1225.5,1840.5 792.0,1842.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1118/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[792.0,1842.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5655997,39.3537888]}},{"type":"Feature","properties":{"resourceCoords":[1369.0,422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5625056,39.355188]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1119/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1119","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1119/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1119","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"301.0,1627.7 306.7,1310.1 301.6,1052.7 303.9,703.8 308.6,598.0 256.1,345.6 569.5,268.2 906.8,191.7 950.3,184.6 951.0,142.9 1193.0,145.0 1187.3,842.1 1153.2,842.0 1246.4,1618.8 1211.0,1630.0 945.8,1714.5 307.6,1925.0 301.0,1627.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1119/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1211.0,1630.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5612276,39.3525837]}},{"type":"Feature","properties":{"resourceCoords":[1193.0,145.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5633934,39.3546333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1120/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1120","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1120/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1120","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"345.8,1847.0 251.4,1084.0 285.0,1084.0 288.1,399.0 774.7,394.0 774.8,228.6 1222.0,252.2 1219.6,590.0 1216.2,1023.1 1219.8,1212.3 1214.2,1567.7 765.0,1712.1 564.8,1776.6 345.8,1847.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1120/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[774.0,1084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5615027,39.3542058]}},{"type":"Feature","properties":{"resourceCoords":[285.0,1084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5624022,39.3536555]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1121/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1121","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1121/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1121","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.5,1776.0 46.5,1666.1 40.8,1007.6 41.1,734.8 41.8,469.0 42.2,259.3 102.5,286.1 411.4,308.7 597.8,328.1 644.2,319.3 714.2,273.7 771.8,252.8 837.7,250.5 1142.1,274.2 1177.7,281.5 1198.3,289.6 1279.6,347.1 1361.3,393.7 1397.7,404.5 1418.0,408.3 1418.0,713.4 1405.8,844.1 1367.8,840.5 1321.4,1375.5 1326.9,1378.0 1314.8,1959.2 1111.5,1859.3 1008.9,1808.5 945.6,1786.0 715.6,1780.5 540.2,1780.3 226.1,1773.7 103.2,1775.2 47.5,1776.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1121/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,1109.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56081783986922,39.351554506321364]}},{"type":"Feature","properties":{"resourceCoords":[998.0,1236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56000892863446,39.35085988760361]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1122/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1122","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1122/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1122","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"169.4,1824.7 144.4,1814.8 111.0,1226.2 105.2,1224.1 110.2,679.7 148.9,680.4 150.9,547.2 128.0,239.0 153.2,241.7 270.3,214.8 365.1,160.4 433.8,138.1 877.2,139.8 1390.6,146.3 1341.3,405.3 1293.0,684.8 1215.9,1096.2 1129.8,1589.0 632.4,1417.0 602.6,1421.8 604.1,1449.5 704.5,2032.4 169.4,1824.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1122/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[728.0,685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55764944705943,39.35039355193893]}},{"type":"Feature","properties":{"resourceCoords":[1108.0,1603.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55827082748515,39.34867739989949]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1123/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1123","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1123/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1123","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"120.6,1354.8 103.7,141.8 389.0,150.3 627.2,163.7 1132.9,179.4 1229.7,777.6 1288.7,780.4 1269.7,1333.0 1305.7,1335.8 1260.8,1828.1 1253.7,1825.5 1218.3,1818.8 916.0,1800.2 850.6,1803.5 793.8,1825.2 725.1,1871.5 679.3,1880.9 494.1,1864.7 187.2,1847.2 127.0,1821.6 120.6,1354.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1123/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1249.0,183.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.556209,39.354606]}},{"type":"Feature","properties":{"resourceCoords":[119.0,1241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5598388,39.3541866]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1124/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1124","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1124/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1124","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"14.3,156.3 66.3,439.6 103.8,693.4 185.1,1163.0 190.5,1211.4 141.5,1219.9 190.9,1234.0 173.6,1354.2 107.9,1559.8 48.8,1855.7 23.4,1972.8 542.6,1928.8 546.5,1916.0 793.5,1884.4 1074.2,1830.5 1265.4,1294.7 1353.0,1056.0 1393.0,948.0 1408.9,882.4 1390.1,651.9 1371.8,476.6 1345.5,161.9 1331.0,39.2 1328.1,14.6 1285.0,15.0 1284.7,10.4 1270.5,9.0 1261.0,9.0 1260.9,8.1 1251.3,7.1 1251.0,10.0 1232.0,10.0 1231.5,5.2 1188.1,1.0 1169.4,1.0 418.4,85.4 349.1,93.2 313.8,123.7 14.3,156.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1124/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[109.0,708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56308603126243,39.348472104523495]}},{"type":"Feature","properties":{"resourceCoords":[1081.0,1801.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55966505548908,39.348562002203984]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1125/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1125","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1125/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1125","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"526.9,1821.0 358.2,1735.2 271.9,1698.1 260.1,1693.0 316.1,1173.7 304.3,1167.3 320.6,918.4 321.2,631.8 317.9,44.1 320.9,16.7 321.7,16.7 350.9,16.9 810.4,266.5 1073.0,413.6 1059.1,451.1 1056.9,687.8 1058.6,929.9 1058.1,1569.3 1073.5,1579.1 901.1,1905.4 859.9,1977.8 815.0,1976.7 526.9,1821.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1125/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[319.0,639.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55963478477115,39.34850898021815]}},{"type":"Feature","properties":{"resourceCoords":[1062.0,1057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55858164595428,39.347203099785]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1126/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1126","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"23"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1126/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1126","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"970.9,1858.2 611.9,1920.2 529.3,1934.3 346.3,1609.2 515.9,1612.8 556.3,1593.2 559.8,1510.0 564.1,1140.8 545.9,1139.2 254.0,570.0 141.8,355.3 35.5,143.8 30.7,104.0 176.9,105.1 270.1,123.8 416.9,137.2 1213.7,149.6 1361.1,155.2 1352.7,692.8 1347.3,925.5 1345.5,1154.5 1377.1,1833.4 970.9,1858.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1126/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[254.0,570.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5584462,39.3474073]}},{"type":"Feature","properties":{"resourceCoords":[555.0,1140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5591535,39.3463807]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1127/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1127","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1127/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1127","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.4,422.3 128.0,384.8 175.0,300.2 233.2,216.0 238.4,202.0 748.5,250.8 751.6,213.5 1324.3,235.8 1303.0,652.6 1258.4,1807.7 1011.8,1839.0 700.5,1858.7 636.0,1854.3 305.9,1778.2 123.0,1728.1 163.9,1209.0 195.2,760.5 177.2,689.4 128.5,589.9 109.0,469.6 117.4,422.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1127/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[178.0,496.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55792449273844,39.351729941031614]}},{"type":"Feature","properties":{"resourceCoords":[179.0,1733.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5555874067249,39.350496651964576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1128/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1128","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1128/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1128","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"955.5,307.9 950.5,346.0 1307.1,406.3 1347.2,842.8 1364.0,836.6 1348.2,1458.1 1357.0,1458.2 1371.1,1914.3 1045.1,1915.8 706.6,1917.3 126.6,1917.9 277.7,804.5 346.0,344.2 955.5,307.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1128/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[842.0,1025.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5550815150498,39.35392207373817]}},{"type":"Feature","properties":{"resourceCoords":[103.0,1926.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55406324033211,39.35195356585608]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1129/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1129","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1129/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1129","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"38.7,1394.7 43.6,896.0 39.5,184.7 314.1,208.1 763.6,240.8 1044.0,265.8 1056.5,322.8 1175.3,582.5 1109.0,600.7 1193.2,1020.7 1180.4,1024.0 1106.7,1878.2 561.4,1850.8 322.5,1832.7 36.4,1818.6 38.7,1394.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1129/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[58.0,876.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55711628159752,39.35727463495179]}},{"type":"Feature","properties":{"resourceCoords":[1174.0,597.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55455447231684,39.35657417591748]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1130/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1130","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1130/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1130","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"558.3,338.1 560.7,351.1 987.9,295.8 1001.6,363.6 1270.4,262.5 1328.4,253.9 1317.0,315.8 1331.0,354.0 1426.0,506.4 1426.0,537.0 1410.0,538.0 1410.0,554.0 1417.0,555.0 1417.0,582.0 1426.0,583.0 1426.0,667.4 1302.8,720.1 1234.1,1308.7 1259.3,1308.4 1255.9,1759.0 809.8,1759.3 147.2,1770.7 127.4,1313.9 118.6,1314.0 126.6,691.3 109.9,697.6 64.3,260.9 558.3,338.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1130/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.0,1310.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5529118,39.3553213]}},{"type":"Feature","properties":{"resourceCoords":[669.0,957.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.553706,39.355538]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1131/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1131","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1131/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1131","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"252.2,658.6 161.8,577.8 593.0,90.0 789.9,267.0 1135.7,565.7 1141.0,703.6 1154.8,1376.7 1153.1,1584.1 1152.3,1748.6 1151.9,1790.5 687.0,1905.7 687.5,1856.5 248.4,1831.5 250.0,1508.0 259.1,708.0 252.2,658.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1131/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[250.0,1508.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5632252,39.3558922]}},{"type":"Feature","properties":{"resourceCoords":[593.0,90.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5646974,39.3583344]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1132/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1132","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1132/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1132","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"137.5,1583.7 171.2,1094.7 130.5,1081.2 42.2,1052.3 350.1,324.8 1214.4,199.7 1314.4,314.6 1351.5,324.8 1349.4,753.7 1343.6,1985.8 1005.9,1869.6 824.1,1814.0 411.6,1675.5 137.5,1583.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1132/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1336.0,1206.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55899773879051,39.35519401102647]}},{"type":"Feature","properties":{"resourceCoords":[1336.0,188.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55768436926289,39.35672538780984]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1133/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1133","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1133/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1133","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"329.0,1830.0 320.1,1523.2 288.4,1453.3 111.6,1220.2 896.5,22.7 1115.8,164.6 1031.7,266.0 1242.9,724.0 1175.3,806.8 1302.6,1206.1 1367.6,1172.6 1308.8,1960.5 1233.6,1961.7 1021.8,1964.4 334.8,1992.8 194.2,2001.3 329.0,1830.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1133/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.55955761007391,39.360765896722974]}},{"type":"Feature","properties":{"resourceCoords":[1419.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.55754148740321,39.35872648852567]}},{"type":"Feature","properties":{"resourceCoords":[1419.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.56130308186631,39.35647176804544]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2038.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.56331920453701,39.35851117624274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1134/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1134","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1134/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1134","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"447.0,785.2 330.9,846.1 351.3,1350.2 257.5,1400.3 222.8,1817.7 1163.2,1744.0 1255.2,1864.8 1291.4,1877.4 1329.0,1375.8 1371.3,659.5 1414.4,43.5 638.0,43.4 1.0,43.3 1.0,128.2 193.4,417.9 249.4,497.3 447.0,785.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1134/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[695.0,1162.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55821039746236,39.358164991509184]}},{"type":"Feature","properties":{"resourceCoords":[178.0,313.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55827317806747,39.3599642425558]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1135 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5390.0"},{"label":"split_canvas_w","value":"1914.8"},{"label":"split_canvas_h","value":"2762.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.7,1418.6 90.0,1598.5 41.6,1947.4 76.0,2004.3 275.7,2017.3 312.1,1944.2 296.0,1915.3 349.2,1909.8 435.8,1407.4 55.7,1418.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[38.0,1413.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55850216076131,39.364573575442705]}},{"type":"Feature","properties":{"resourceCoords":[274.8,1908.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55862696934201,39.36357768029524]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1135 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5676.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"967.8,1976.1 1352.6,1978.2 1341.8,1515.3 1339.8,1515.3 1355.6,1049.5 1364.0,1049.4 1383.3,578.9 1344.0,578.9 1312.8,78.1 225.8,79.0 123.8,583.9 69.9,587.9 85.3,617.5 46.4,690.3 53.5,691.0 62.0,1055.2 20.1,1072.4 145.8,1111.4 313.2,1012.8 338.8,1058.0 618.4,1500.7 933.9,1975.9 967.8,1976.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1135__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[129.0,581.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55846491171128,39.363504771130245]}},{"type":"Feature","properties":{"resourceCoords":[-110.0,82.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55837746172597,39.36450151783593]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1136/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1136","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.63"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1136/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1136","type":"ImageService3","width":1426,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"493.9,1969.9 230.4,1988.3 186.6,1546.2 184.7,1546.4 166.0,1099.6 174.2,1098.9 158.5,647.4 120.9,650.3 54.8,173.5 370.4,149.3 1239.0,80.0 1239.0,1917.9 493.9,1969.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1136/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1239.0,991.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5541916,39.3607251]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5529579,39.36215]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1137/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1137","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1137/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1137","type":"ImageService3","width":1419,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"73.0,1802.5 133.8,1646.9 110.8,1544.8 141.4,1476.5 34.9,1140.1 93.9,789.5 68.0,503.9 97.8,313.2 76.2,231.3 123.2,171.1 122.4,161.4 230.6,140.9 460.5,101.6 700.5,62.2 704.8,86.2 834.9,77.5 834.2,73.4 866.0,67.3 915.2,326.0 908.6,340.1 1093.1,310.5 1299.6,274.1 1346.7,552.0 1349.7,831.8 1348.8,963.6 1352.6,1185.9 1352.0,1345.5 1354.5,1447.5 1354.8,1740.0 1356.3,2021.0 1281.1,1994.7 1015.5,1901.7 1003.3,1918.0 936.0,1979.5 630.5,1966.0 613.6,1980.4 353.8,1981.7 355.0,1979.6 78.6,1976.7 73.0,1802.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1137/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[391.0,1449.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.57247817891881,39.35381457869764]}},{"type":"Feature","properties":{"resourceCoords":[1351.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56718186121539,39.356237953708764]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1138/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1138","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.39"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1138/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1138","type":"ImageService3","width":1426,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.7,1044.5 401.9,1305.6 403.4,1328.1 340.0,1541.3 325.6,1598.9 323.1,1634.8 707.6,1748.5 1053.1,1780.5 1233.3,1669.3 1190.3,1601.5 1194.7,1249.9 1220.8,950.4 1272.2,814.6 1270.3,550.2 1334.0,501.3 1132.9,335.7 1133.6,329.8 926.8,281.4 757.5,246.7 750.5,291.4 724.9,387.2 713.0,423.8 677.8,436.4 690.0,395.1 139.8,442.6 139.3,442.6 139.9,448.5 1.0,468.9 1.0,488.0 78.7,479.7 109.2,745.6 104.0,746.0 168.4,1049.5 190.4,1076.3 228.7,1044.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1138/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[673.0,1196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.565998,39.339298]}},{"type":"Feature","properties":{"resourceCoords":[894.0,808.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5640201,39.3399396]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1144/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1144","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"21"},{"label":"confidence","value":"0.56"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1144/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1144","type":"ImageService3","width":1426,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.8,1117.8 37.0,323.8 70.2,139.3 108.5,97.1 383.5,109.3 382.2,111.2 640.8,118.7 658.1,105.0 961.7,128.6 1030.7,69.7 1043.3,53.8 1304.6,155.2 1205.0,401.1 1222.1,408.2 1137.1,747.3 1233.7,784.9 1021.6,1314.0 993.7,1597.7 717.6,1569.4 720.1,1586.3 467.4,1706.2 485.6,1830.7 491.3,1850.4 591.8,2037.0 582.2,2037.0 508.6,1886.8 203.1,1919.0 170.2,1829.7 163.8,1793.2 191.8,1508.8 134.3,1240.5 72.1,1230.8 47.8,1117.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1144/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[121.0,714.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.574923,39.3500016]}},{"type":"Feature","properties":{"resourceCoords":[866.0,1112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5718429,39.348081]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1145__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1145 [1]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5720.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1145__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1145","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"98.6,1151.0 105.4,1153.8 123.4,1958.7 114.5,1971.5 301.5,1972.7 511.4,1970.9 776.9,1969.0 1019.0,1968.9 1017.2,1635.2 1015.2,1402.5 923.6,1402.4 912.5,1323.5 897.0,1323.5 897.0,1212.2 876.9,1068.6 906.6,993.9 1260.3,325.4 1234.6,354.4 1165.4,358.6 1155.7,361.4 1203.5,239.6 1215.5,209.1 1242.6,219.8 1238.6,147.8 1047.8,154.7 808.2,93.2 137.6,100.7 88.9,234.6 162.8,684.1 75.0,925.2 98.6,1151.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1145__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[51.0,1090.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5690521,39.3604906]}},{"type":"Feature","properties":{"resourceCoords":[508.0,1383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5670016,39.3593444]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1152 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"5724.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152","type":"ImageService3","width":1431,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"476.4,1759.8 524.7,1752.9 699.0,1733.2 736.2,1752.2 740.9,1743.2 748.6,1728.0 1032.0,1694.3 1292.7,1669.4 1318.7,1668.2 1312.5,1571.2 1358.2,1523.8 1391.8,1099.6 1350.6,697.5 1412.9,715.1 1418.8,700.0 701.2,311.8 627.0,281.5 483.4,300.2 372.3,299.2 372.1,314.7 293.3,325.0 292.3,416.5 59.9,416.4 58.3,551.8 60.0,785.6 63.9,894.3 166.9,1008.2 201.8,1024.6 345.2,1056.3 432.9,1765.3 476.4,1759.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[757.0,1726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55843890261777,39.3606275129734]}},{"type":"Feature","properties":{"resourceCoords":[1178.0,522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56396175203376,39.36234763794867]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1152 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.70"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4456.4"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1267.6"},{"label":"split_canvas_h","value":"1690.4"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152","type":"ImageService3","width":1431,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1117.3,199.0 1117.4,203.6 1175.2,328.5 1185.9,332.4 1195.1,335.8 1247.5,355.0 1367.2,368.6 1367.7,399.0 1403.2,397.0 1418.2,251.2 1430.0,245.8 1430.0,187.9 1365.0,187.8 1117.2,187.6 1117.3,199.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1152__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1114.1,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.5641132282289,39.36304673812874]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.5638037277754,39.36356956608715]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,422.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.56290200347524,39.36325003837474]}},{"type":"Feature","properties":{"resourceCoords":[1114.1,422.6],"type":"corner"},"geometry":{"type":"Point","coordinates":[-76.56321150392876,39.362727210416324]}},{"type":"Feature","properties":{"resourceCoords":[1365.0,187.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5634674,39.3633187]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1153/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1153","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1153/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1153","type":"ImageService3","width":1430,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"305.4,1961.0 413.4,1950.5 482.9,1949.6 571.1,1959.2 638.4,1961.2 700.8,1956.3 1009.8,1926.9 1160.6,1909.3 1185.8,1680.0 1210.6,1387.7 1232.8,1160.6 1264.8,816.6 1296.0,515.1 1308.8,373.9 1328.3,141.8 1329.3,132.1 1210.2,1.0 1190.6,1.0 1211.8,45.2 1113.6,98.5 880.0,89.8 560.8,165.6 449.2,69.3 170.3,102.1 88.3,193.2 97.2,404.7 46.9,491.4 51.7,512.5 190.9,747.7 243.7,783.1 288.1,818.7 152.0,964.9 116.1,1304.0 139.9,1301.3 196.1,1736.2 286.4,1724.8 305.4,1961.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1153/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[168.0,1508.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55298262279985,39.36880483311434]}},{"type":"Feature","properties":{"resourceCoords":[1240.0,934.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5472881123562,39.36877848100795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1154/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1154","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1154/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1154","type":"ImageService3","width":1426,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1090.5,120.8 1099.5,121.5 1182.5,905.7 1218.9,902.3 1231.0,1010.7 1233.0,1080.6 1224.6,1169.5 1223.4,1237.1 1229.3,1299.8 1263.3,1610.1 1283.1,1761.5 1228.1,1758.7 1067.2,1746.4 919.5,1736.5 792.1,1725.5 609.1,1712.6 478.2,1702.1 315.6,1687.2 63.5,1667.4 62.8,1211.9 64.5,308.6 79.4,306.3 118.6,284.3 133.3,172.9 169.7,161.1 277.9,177.7 375.9,122.6 400.7,151.6 443.2,127.8 594.6,137.2 694.9,93.8 932.5,80.7 1033.8,131.2 1071.2,120.3 1070.7,110.5 1090.5,120.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1154/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[79.0,1210.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55477972000152,39.363005216619406]}},{"type":"Feature","properties":{"resourceCoords":[79.0,1440.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55384583022439,39.36259974198437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1155/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1155","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1155/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1155","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"84.3,1794.7 111.3,1614.5 132.2,1489.1 153.5,1343.7 178.2,1185.3 185.3,1131.0 225.2,904.1 268.8,614.3 305.6,389.4 359.6,48.6 492.2,70.5 556.1,74.2 666.5,74.3 776.9,78.2 1146.6,80.7 1394.9,85.9 1393.1,144.2 1394.4,263.0 1375.1,273.4 1407.6,1115.4 1372.4,1287.4 1408.5,1684.8 1391.0,1877.4 1353.8,1947.9 1356.8,1960.2 1038.0,1957.6 1037.8,1929.5 732.1,1927.6 733.0,1955.2 216.7,1951.0 224.9,1924.4 63.6,1923.5 84.3,1794.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1155/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[182.0,1133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54981277627351,39.36581157014175]}},{"type":"Feature","properties":{"resourceCoords":[1338.0,1942.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54648494660381,39.361392011732306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1162/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1162","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1162/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1162","type":"ImageService3","width":1428,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"778.2,1916.7 708.9,1974.6 690.8,1984.2 659.2,1982.8 516.9,1980.1 289.1,1979.3 149.7,1977.1 129.8,1668.2 68.2,712.5 51.9,461.0 43.6,298.4 201.7,263.8 199.5,291.7 705.8,182.0 698.9,155.2 998.5,89.8 1004.9,117.2 1317.6,49.5 1393.8,206.1 1404.3,692.1 1345.0,878.8 1361.4,1078.0 1418.9,1146.8 1427.0,1145.2 1427.0,1178.2 1390.2,1177.2 1384.0,1417.0 1377.2,1574.7 1379.1,1674.0 1383.2,1719.8 1410.3,1890.7 1413.7,1914.5 1189.1,1944.1 1191.0,1956.6 893.1,1963.2 858.4,1905.5 793.4,1914.6 778.2,1916.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1162/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[517.0,1704.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55411301591013,39.35832149336573]}},{"type":"Feature","properties":{"resourceCoords":[104.0,1170.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55412569868464,39.36076002734137]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1163/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1163","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1163/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1163","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"80.1,1566.1 76.1,1065.8 78.2,816.1 76.4,642.1 79.1,595.9 91.8,496.8 122.0,341.0 163.6,103.2 200.1,109.7 206.0,76.8 587.4,53.8 1336.6,80.4 1371.2,104.1 1413.8,660.4 1396.9,931.8 1348.3,1130.6 1380.8,1258.7 1333.7,1297.7 1373.8,1408.6 1339.5,1431.9 1369.4,1501.2 1371.1,1891.2 1354.6,1907.9 1041.4,1865.6 816.6,1832.7 506.2,1792.8 286.3,1760.7 295.0,1697.6 81.1,1695.8 80.1,1566.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1163/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[523.0,990.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54991754683851,39.35450085744284]}},{"type":"Feature","properties":{"resourceCoords":[304.0,139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54888841956107,39.357554997409245]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1168/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1168","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1168/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1168","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1299.7,142.1 1334.5,248.6 1334.0,376.1 1328.8,1016.3 1330.2,1261.1 1325.8,1894.0 906.5,1905.8 471.3,1919.2 81.0,1955.2 52.0,1514.3 120.1,1321.8 63.8,610.6 159.6,230.2 289.3,242.1 420.3,105.8 1297.5,142.0 1299.7,142.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1168/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[460.0,1923.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56135406502132,39.33502938479056]}},{"type":"Feature","properties":{"resourceCoords":[957.0,383.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56118192572009,39.33792015834436]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1169/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1169","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1169/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1169","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1002.9,14.7 1428.5,30.9 1408.9,580.1 1346.2,1483.1 1284.3,1509.0 1333.8,1578.2 244.2,1980.9 184.6,2010.1 153.9,2025.1 132.3,2025.6 190.1,1839.9 117.3,1509.9 127.4,740.0 75.0,463.9 198.7,108.5 619.6,44.1 619.6,23.6 1002.9,14.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1169/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[155.0,1590.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56200024117035,39.33181162798117]}},{"type":"Feature","properties":{"resourceCoords":[1280.0,1544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55952451001434,39.33256701127371]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1170/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1170","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1170/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1170","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.7,2031.0 245.2,1145.1 363.9,602.9 768.2,693.5 926.2,88.6 1410.0,214.3 1227.7,917.0 1166.5,1175.8 1169.6,1222.1 1208.6,1285.7 1308.8,1378.6 1358.3,1469.5 1402.8,1725.5 1167.4,1781.3 875.6,1844.2 742.3,1878.9 481.9,1931.0 305.6,1977.3 19.7,2031.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1170/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1227.0,924.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55824005141741,39.33553241834023]}},{"type":"Feature","properties":{"resourceCoords":[736.0,798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5593855572333,39.33529334324402]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1171/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1171","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1171/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1171","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1237.9,1795.7 748.2,1808.0 246.1,1820.5 237.3,1577.7 223.0,942.3 203.3,211.7 1198.3,180.5 1215.7,889.5 1298.3,1146.2 1281.0,1146.6 1222.0,1148.0 1233.8,1631.7 1237.9,1795.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1171/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1222.0,1148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5579707,39.3381691]}},{"type":"Feature","properties":{"resourceCoords":[733.0,1000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5591587,39.3382228]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1172/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1172","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1172/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1172","type":"ImageService3","width":1427,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"768.0,573.0 801.9,413.0 1204.9,498.4 1108.7,733.1 1091.8,823.1 1104.8,894.6 1320.8,1663.9 1334.5,1724.5 817.2,1863.6 505.6,1947.2 352.7,1985.3 296.4,1731.1 242.6,1642.4 137.9,1554.0 96.0,1492.1 90.7,1446.0 140.0,1184.0 290.1,472.1 768.0,573.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1172/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[140.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5582468,39.3355441]}},{"type":"Feature","properties":{"resourceCoords":[768.0,573.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5575827,39.3370412]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1173/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1173","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1173/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1173","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"364.2,1850.4 353.9,1053.3 359.8,981.1 399.1,898.6 552.2,697.2 185.7,511.2 403.4,81.9 598.2,180.9 697.3,213.8 1099.0,330.5 1347.6,399.9 1350.1,400.6 1119.2,798.8 1107.0,796.5 1105.9,990.4 1108.5,1309.9 1116.8,1674.9 1119.1,1905.4 777.6,1910.2 361.9,1912.4 364.2,1850.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1173/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[763.0,1498.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55513372681177,39.33669100834485]}},{"type":"Feature","properties":{"resourceCoords":[358.0,1498.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55584069538804,39.33620232622628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1174/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1174","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1174/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1174","type":"ImageService3","width":1431,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.2,726.1 260.8,301.8 384.0,315.2 496.2,328.4 580.1,353.6 705.6,361.9 870.5,311.4 1095.2,229.8 1185.1,208.8 1297.8,214.4 1299.9,116.5 1364.9,75.3 1366.4,21.0 1389.0,21.0 1412.0,29.0 1430.0,29.0 1430.0,260.7 1159.5,1230.8 1106.0,1479.2 1065.8,1686.7 982.0,1704.9 786.6,1734.4 247.2,1814.2 212.2,1587.9 152.3,1230.2 104.4,916.4 77.9,725.6 90.2,726.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1174/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55458907405603,39.339499762368476]}},{"type":"Feature","properties":{"resourceCoords":[574.0,736.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55464003272826,39.33853735563859]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1175/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1175","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1175/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1175","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"659.5,1895.8 658.2,1889.7 439.6,1912.5 262.3,1935.9 236.9,1825.2 222.7,1752.9 211.2,1701.0 180.6,1541.2 163.1,1463.8 141.2,1330.8 128.6,1180.6 112.2,918.8 80.5,919.7 59.9,578.7 59.2,463.5 60.3,346.6 60.8,76.3 177.7,76.8 396.8,79.2 699.5,81.1 762.8,93.5 831.3,115.1 942.8,157.5 985.8,163.1 1127.2,170.5 1342.6,187.0 1432.0,203.4 1432.0,553.3 1398.5,583.1 1329.0,582.8 1200.4,774.0 1242.8,960.3 1281.0,996.3 1310.1,1008.9 1331.7,1011.0 1304.0,1239.0 1324.9,1246.0 1253.1,1466.9 1098.5,1941.9 1386.4,2037.0 1340.7,2037.0 1330.6,2037.0 1336.4,2021.5 1046.1,1943.2 938.8,1949.1 912.2,1989.5 659.5,1895.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1175/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1165.0,1715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5597371493657,39.33962889797183]}},{"type":"Feature","properties":{"resourceCoords":[111.0,1307.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56084197236999,39.34359549181885]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1176/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1176","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1176/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1176","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1331.8,981.4 1341.9,868.0 1365.0,782.8 1369.9,656.1 1314.5,491.5 1225.9,267.3 1202.4,177.4 1204.9,63.7 1106.2,64.3 1063.5,1.0 548.0,1.0 495.2,50.3 357.2,52.7 110.9,438.3 203.6,805.8 281.1,875.5 339.3,899.1 382.2,902.4 337.7,1356.2 379.6,1369.0 247.2,1810.7 922.4,2018.4 987.9,2019.2 1190.9,2021.5 1233.0,1885.1 1248.5,1781.8 1295.3,1365.5 1321.5,1108.5 1331.8,981.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1176/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[913.0,912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55594264229185,39.33969377023348]}},{"type":"Feature","properties":{"resourceCoords":[246.0,1799.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55852830669464,39.33986696431047]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1177/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1177","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1177/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1177","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1410.2,151.8 799.9,108.5 800.0,150.1 273.2,115.2 273.1,27.0 137.7,81.0 1.0,71.8 1.0,583.1 16.0,585.0 16.0,604.0 1.0,605.0 1.0,863.1 12.0,864.0 12.0,886.0 1.0,886.9 1.0,1154.4 13.0,1159.0 13.0,1175.0 1.0,1175.9 1.0,1176.2 12.0,1178.0 11.0,1234.0 1.0,1234.9 1.0,1262.1 9.0,1263.0 9.0,1290.0 1.0,1290.9 1.0,1649.7 266.2,1775.2 267.0,1903.0 676.3,1903.7 1163.3,1919.3 1330.5,740.6 1395.0,264.4 1410.2,151.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1177/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[800.0,155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.547436,39.342535]}},{"type":"Feature","properties":{"resourceCoords":[267.0,1903.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.551025,39.34071]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1178/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1178","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1178/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1178","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"138.9,94.2 124.4,1.0 116.7,1.0 110.0,25.0 83.0,25.0 79.0,20.0 80.9,1.0 61.0,1.0 61.0,14.0 53.0,17.0 52.0,34.0 36.0,34.0 35.0,26.0 25.0,25.0 24.0,31.0 5.0,31.0 1.0,27.0 1.0,1350.6 892.1,1737.8 1131.8,1825.2 1332.8,1893.9 1330.2,1792.5 1332.0,1450.0 1332.9,613.7 1333.1,448.2 1333.3,286.9 1332.0,183.0 847.5,242.2 709.6,263.4 442.1,304.4 421.8,178.0 138.9,94.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1178/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1332.0,1450.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5516564,39.3381237]}},{"type":"Feature","properties":{"resourceCoords":[1332.0,183.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5494291,39.3396461]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1179/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1179","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1179/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1179","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"830.9,1915.3 817.2,2019.9 906.0,2023.0 907.0,2037.0 932.0,2037.0 933.0,2026.0 949.0,2026.0 950.0,2037.0 1167.9,2037.0 1297.3,1975.1 1272.6,1615.0 1260.2,1627.7 1330.2,298.1 1350.2,306.1 1432.0,344.1 1432.0,155.3 1355.7,156.9 1279.0,76.1 1027.5,48.7 479.5,108.3 479.6,106.7 1.0,40.0 1.0,50.0 313.9,103.3 256.8,527.5 263.8,524.6 268.8,972.4 201.8,996.4 145.7,1015.5 566.7,1964.1 728.8,1953.3 830.9,1915.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1179/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[654.0,1964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54927357155431,39.34414550146991]}},{"type":"Feature","properties":{"resourceCoords":[480.0,137.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54661416557819,39.34676818934744]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1182/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1182","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1182/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1182","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1377.5,1898.4 759.8,1935.4 765.3,1977.0 232.4,2011.5 172.4,1561.5 160.8,1575.1 145.8,229.5 166.4,236.3 251.3,269.4 239.2,79.0 961.9,17.6 1276.7,53.2 1278.6,48.0 1396.8,52.4 1391.2,326.7 1379.2,1456.2 1379.1,1491.5 1378.3,1708.0 1377.6,1882.7 1377.5,1898.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1182/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[800.0,394.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.544675,39.344429]}},{"type":"Feature","properties":{"resourceCoords":[766.0,1982.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.547436,39.342535]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1183/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1183","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1183/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1183","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1112.9,1990.0 1039.6,1978.0 642.1,1922.1 569.6,1906.2 524.2,1891.1 451.2,1881.4 301.5,1857.2 298.3,1606.8 298.2,1397.2 296.1,1255.3 296.4,1123.2 297.9,1029.7 293.7,862.5 287.9,831.1 240.2,684.7 194.9,570.6 94.2,293.8 79.8,254.6 282.2,183.9 295.4,246.3 513.8,202.1 820.1,134.7 1043.5,89.7 1353.3,23.6 1335.2,62.8 1341.1,193.1 1370.7,219.1 1308.2,337.7 1305.5,338.3 1283.0,665.9 1292.3,663.9 1279.9,924.2 1267.0,926.8 1298.3,1221.5 1365.4,1192.2 1432.0,1162.0 1422.8,1180.8 1314.1,1341.6 1272.7,1415.5 1230.1,1514.5 1208.1,1593.0 1196.7,1659.4 1207.1,1723.3 1216.6,1863.2 1228.8,2006.6 1112.9,1990.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1183/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[297.0,1392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55660358250373,39.34978368366613]}},{"type":"Feature","properties":{"resourceCoords":[297.0,1120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55565575802122,39.35042596339052]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1184/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1184","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1184/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1184","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"79.3,1656.2 64.5,1518.1 51.6,1455.2 60.4,1389.1 79.1,1310.5 117.5,1210.9 155.6,1136.2 256.8,972.8 270.6,951.1 200.5,986.4 135.3,1017.9 92.9,727.5 105.5,724.5 107.7,466.4 98.5,468.6 108.0,143.6 110.8,142.9 167.9,23.1 195.6,45.5 907.4,31.4 1137.8,54.8 1140.0,74.9 896.9,73.0 897.6,78.0 1057.3,84.1 1056.6,298.9 1059.9,297.1 1091.7,519.6 1059.8,535.9 1033.2,549.1 1304.7,993.7 1384.6,977.8 1432.0,952.7 1432.0,1519.0 1417.0,1522.0 1416.0,1540.0 1419.0,1546.0 1432.0,1546.0 1432.0,1768.0 1407.0,1774.0 1406.0,1791.0 1432.0,1796.0 1432.0,1825.0 1420.0,1825.0 1419.0,1830.0 1410.0,1832.0 1409.0,1854.0 1426.0,1855.0 1432.0,1851.0 1432.0,1879.0 1424.0,1879.0 1423.0,1887.0 1412.0,1893.0 1412.0,1912.0 1432.0,1910.0 1432.0,1944.0 1423.0,1945.0 1422.0,1967.0 1432.0,1970.0 1432.0,2025.0 1411.0,2024.0 1410.0,2017.0 1377.0,2017.0 1376.0,2021.0 1337.0,2019.0 1336.0,2023.0 1287.0,2019.0 1238.1,2021.0 1236.5,2020.5 1025.5,1983.2 886.5,1962.0 844.6,1952.3 738.6,1899.5 673.2,1871.4 611.8,1853.0 313.1,1821.5 96.9,1797.6 79.3,1656.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1184/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1118.0,266.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54732534172074,39.346435659745886]}},{"type":"Feature","properties":{"resourceCoords":[464.0,1226.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55274096271226,39.34609009944549]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1192/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1192","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1192/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1192","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"125.4,350.8 297.8,283.9 360.2,97.3 507.1,52.0 677.0,91.0 937.5,78.5 959.4,101.2 1123.2,70.2 1327.2,122.6 1363.1,238.0 1309.9,379.0 1281.1,446.7 1286.5,526.8 1305.0,720.8 1327.8,1041.1 1356.8,1341.8 1409.5,2004.6 1411.0,2024.0 1402.0,2018.0 1382.0,2019.2 738.0,1806.4 652.4,1778.4 516.6,1728.5 253.9,1647.4 222.1,1638.6 70.8,1588.2 146.7,1546.9 107.1,1326.9 95.3,1327.7 125.4,350.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1192/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53175833792719,39.353847880195296]}},{"type":"Feature","properties":{"resourceCoords":[606.0,23.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53998408058423,39.3557595979144]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1193/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1193","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1193/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1193","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"203.0,1881.2 203.2,553.9 196.6,166.5 719.2,150.8 719.3,187.1 1162.2,199.1 1161.2,586.7 1245.2,586.9 1244.0,1232.4 1250.8,1612.2 1250.5,1727.4 1261.1,1753.2 1256.0,1868.8 1175.1,1951.1 259.0,1953.2 203.0,1930.0 203.0,1881.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1193/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[720.0,1238.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5309303,39.3568431]}},{"type":"Feature","properties":{"resourceCoords":[720.0,585.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5323917,39.3572309]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1194/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1194","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1194/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1194","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"264.8,1896.4 260.0,1515.0 264.7,866.9 180.3,866.2 183.6,464.3 185.4,223.8 263.1,226.2 800.3,222.9 1006.4,223.3 1322.3,667.6 1322.0,870.0 1315.0,1581.5 1227.7,1893.2 1075.8,1952.2 789.6,1822.1 384.9,1896.2 279.6,1931.6 275.7,2012.2 263.9,2012.1 264.8,1896.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1194/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[260.0,1515.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5305404,39.3577531]}},{"type":"Feature","properties":{"resourceCoords":[1322.0,870.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5311809,39.3599621]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1195/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1195","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1195/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1195","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"176.0,1666.0 181.5,1884.5 711.4,1864.2 711.7,1901.0 1160.8,1909.5 1160.8,1896.8 1159.4,1653.9 1237.8,1655.2 1230.6,1003.5 1254.8,1002.7 1227.2,612.1 1223.2,161.4 1195.5,166.1 1183.8,1.0 1145.8,1.0 1165.7,111.4 937.5,183.8 633.2,85.0 370.7,82.3 363.0,49.7 235.2,326.8 167.3,459.3 166.7,621.8 176.0,1016.0 176.0,1666.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1195/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[176.0,1016.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.535646,39.357085]}},{"type":"Feature","properties":{"resourceCoords":[176.0,1666.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5342154,39.3566953]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1196__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1196 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"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":"3496.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1196__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1196","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"94.0,1323.5 367.5,1317.7 472.4,1316.3 636.8,1540.0 638.2,1643.1 640.2,2005.5 649.4,1970.7 763.4,1942.3 787.6,1897.7 752.9,1766.0 763.0,1478.5 710.6,1105.0 742.1,1001.9 731.9,905.5 764.5,862.0 712.9,716.3 766.9,553.5 766.9,237.0 717.5,198.7 569.4,187.2 423.0,79.1 285.0,96.0 108.0,194.8 41.4,266.4 26.9,383.5 46.0,488.9 65.2,488.9 71.2,572.7 85.2,570.3 87.6,797.6 102.0,994.5 89.7,994.9 94.0,1323.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1196__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[364.0,1319.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53301837891186,39.35942473637887]}},{"type":"Feature","properties":{"resourceCoords":[632.0,1640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53120407508533,39.35994481193638]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1197 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.94"},{"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":"5732.0"},{"label":"split_canvas_h","value":"8152.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"132.9,1784.0 266.8,1805.2 331.3,1808.4 442.6,1807.8 554.0,1811.0 926.9,1811.1 1177.3,1814.7 1176.0,1873.5 1178.0,1993.3 1267.5,1944.4 1312.6,1952.2 1330.2,1919.0 1383.2,1529.0 1360.8,1269.8 1400.2,1251.4 1307.0,947.4 1326.1,908.2 1228.8,535.0 1263.1,551.4 1371.3,311.4 1334.2,278.4 1238.5,277.8 1137.2,89.0 1101.8,93.2 644.5,681.6 546.0,727.9 585.4,838.0 444.6,900.1 331.5,853.8 252.4,861.9 96.2,935.4 105.5,958.2 124.8,959.3 237.8,1099.2 236.2,1108.9 203.2,1341.2 181.9,1482.5 132.9,1784.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,1811.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5452064,39.3683772]}},{"type":"Feature","properties":{"resourceCoords":[554.0,1342.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5442786,39.3699022]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1197 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.08"},{"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":"4410.4"},{"label":"split_canvas_h","value":"3742.4"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"223.8,188.8 203.6,158.9 104.5,510.9 70.2,533.7 1.0,826.6 1.0,827.0 73.2,833.5 126.2,877.5 588.4,665.5 627.0,554.7 701.6,518.5 942.2,186.6 982.7,54.4 955.6,37.7 429.4,51.0 427.2,44.3 223.8,188.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1197__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[334.9,359.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5391145,39.3707804]}},{"type":"Feature","properties":{"resourceCoords":[473.8,580.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5383387,39.3699935]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1198/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1198","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1198/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1198","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1356.2,687.2 1362.0,1396.5 1293.0,1915.1 1195.6,1971.7 170.3,1996.6 95.8,1980.9 60.9,1890.4 75.0,265.4 2.5,244.4 79.9,142.4 615.8,298.5 1098.1,623.6 1169.6,647.3 1361.3,674.7 1356.2,687.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1198/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[633.0,310.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5753059,39.3470901]}},{"type":"Feature","properties":{"resourceCoords":[174.0,3.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5749513,39.3480342]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1199 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.86"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1594.4"},{"label":"split_canvas_w","value":"5732.0"},{"label":"split_canvas_h","value":"6557.6"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"558.7,2018.2 560.0,2009.3 1350.2,1995.7 1350.0,1959.0 1348.6,1720.3 1257.0,1725.1 1233.0,1283.9 1208.8,1284.9 1270.2,947.0 1417.8,810.2 1375.9,771.2 1325.5,731.6 1207.7,494.1 1207.7,494.1 1210.5,532.8 170.7,947.8 60.2,1022.3 115.4,1656.1 213.2,1690.3 334.9,1923.6 313.6,1949.7 508.4,1952.5 546.5,2037.0 551.3,2037.0 556.5,2037.0 558.7,2018.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1350.0,1959.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5534299,39.3671262]}},{"type":"Feature","properties":{"resourceCoords":[695.0,1339.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.555021,39.370124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1199 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.49"},{"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":"5732.0"},{"label":"split_canvas_h","value":"4024.0"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1186.5,503.1 1187.0,502.9 974.0,1.0 966.8,1.0 968.8,4.7 907.1,33.4 530.2,46.1 332.8,96.2 125.3,88.5 57.4,336.5 61.5,721.7 77.5,872.5 168.8,925.8 435.4,818.6 452.0,814.4 476.4,763.9 473.6,754.5 576.0,711.2 794.3,623.3 1022.6,533.1 1032.0,555.9 1124.8,529.2 1135.1,524.9 1157.0,515.6 1186.5,503.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1199__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[489.0,195.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5712264,39.360348]}},{"type":"Feature","properties":{"resourceCoords":[837.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5695381,39.3602065]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1500/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1500","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1500/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1500","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"319.8,1612.8 244.6,1235.3 257.6,702.4 288.7,199.2 570.0,200.0 1252.1,213.6 1239.8,544.8 1214.7,701.9 1122.2,702.9 800.5,1473.7 818.6,1571.0 479.2,1860.5 370.0,1888.0 319.8,1612.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1500/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[570.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5540155,39.333207]}},{"type":"Feature","properties":{"resourceCoords":[370.0,1888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.557242,39.331425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1501/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1501","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1501/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1501","type":"ImageService3","width":1433,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"383.7,1792.5 171.5,1829.0 165.2,1645.1 172.0,1377.0 167.6,1237.9 170.7,936.5 168.2,692.1 171.9,533.5 174.1,208.3 744.8,207.8 1242.2,208.8 1211.2,715.3 1198.5,1251.6 1274.5,1631.5 383.7,1792.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1501/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[753.0,1719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55780868021392,39.332412467700074]}},{"type":"Feature","properties":{"resourceCoords":[174.0,217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55613385684988,39.33499102449586]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1502/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1502","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1502/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1502","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"527.9,1798.3 425.9,1795.4 357.4,1803.4 134.6,1767.3 46.1,1724.3 47.4,1657.7 187.5,498.2 102.9,510.7 108.1,443.4 139.5,155.5 350.7,134.6 1237.9,39.2 1268.2,315.1 1272.9,389.6 1297.7,541.0 1316.8,689.6 1387.8,1061.1 1219.9,1067.2 1239.0,1280.1 1269.3,1690.8 905.1,1713.1 911.7,1780.4 527.9,1798.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1502/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55917760303777,39.33093060476223]}},{"type":"Feature","properties":{"resourceCoords":[76.0,1080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56051155343424,39.331914529672154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1503/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1503","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1503/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1503","type":"ImageService3","width":1429,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1428.0,1717.8 1428.0,1745.5 1211.3,1749.7 1015.0,1749.0 509.1,1748.8 266.7,1745.8 107.6,1748.4 82.2,355.5 71.5,345.8 70.3,283.9 159.2,323.0 380.5,350.1 447.7,339.6 548.6,338.6 926.5,306.4 1275.4,273.9 1330.9,703.4 1341.6,701.2 1399.0,939.7 1375.8,958.1 1361.0,1362.4 1279.6,1467.2 1326.8,1502.8 1291.5,1570.7 1428.0,1703.2 1428.0,1717.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1503/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1015.0,1749.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5625433,39.3279763]}},{"type":"Feature","properties":{"resourceCoords":[70.0,1749.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5641107,39.3292248]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1504/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1504","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1504/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1504","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1399.1,1388.0 1295.1,1588.3 1361.5,1682.0 1306.0,1878.8 1189.7,1976.6 438.3,1960.2 312.6,1869.8 231.6,1883.0 128.2,1771.8 84.4,1646.7 161.4,859.9 100.8,605.2 228.2,206.6 392.9,212.3 643.6,228.1 1167.1,255.0 1165.6,455.7 1169.0,635.9 1153.6,825.7 1154.0,1377.0 1437.0,1382.7 1437.0,1389.6 1399.1,1388.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1504/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1154.0,1377.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.564321,39.326532]}},{"type":"Feature","properties":{"resourceCoords":[183.0,456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5645135,39.3289059]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1505/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1505","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1505/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1505","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.1,1465.8 59.9,1050.5 56.7,709.5 57.4,161.3 57.3,146.8 737.9,75.5 738.0,55.2 978.0,55.1 1133.8,49.6 1361.7,56.1 1373.7,61.6 1417.5,473.7 1415.1,473.6 1361.7,1487.1 1387.1,1487.7 1396.3,1844.9 1394.5,1996.2 622.9,1997.2 58.6,1999.6 60.1,1465.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1505/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[606.0,1992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55524627212407,39.33427367807224]}},{"type":"Feature","properties":{"resourceCoords":[606.0,1470.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55433773507464,39.33490759545346]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1506/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1506","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1506/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1506","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"885.2,141.2 878.1,453.3 851.1,1342.8 852.0,1521.1 841.8,1733.0 835.1,1989.6 164.8,1978.0 166.8,1828.5 158.1,1475.7 133.1,1475.1 187.3,474.3 189.7,474.4 147.1,67.3 157.2,71.9 188.2,89.6 320.9,95.4 319.2,128.8 885.8,119.3 885.2,141.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1506/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[156.0,95.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55071559365477,39.33553812491205]}},{"type":"Feature","properties":{"resourceCoords":[161.0,1475.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55313629618153,39.333831619337154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1507/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1507","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1507/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1507","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1147.7,1837.7 991.6,1844.9 750.9,1847.8 751.0,1868.1 69.4,1947.3 67.0,1762.8 60.3,1676.6 57.5,1574.8 59.0,1231.1 58.9,391.7 58.8,63.8 288.4,64.6 1335.7,68.4 1344.2,614.7 1363.6,614.4 1363.2,1304.3 1402.5,1303.7 1398.7,1851.5 1376.3,1841.5 1147.7,1837.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1507/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[752.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55166855100263,39.336445021547405]}},{"type":"Feature","properties":{"resourceCoords":[76.0,623.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55056383993313,39.338827619917424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1508/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1508","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1508/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1508","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"452.2,99.9 478.1,85.0 625.7,79.8 1092.8,91.8 1119.8,619.6 1135.1,619.2 1142.2,1404.5 1004.9,1341.9 908.5,1313.7 899.0,1619.8 893.8,1900.8 325.4,1914.9 326.8,1881.5 193.6,1876.8 162.3,1859.2 168.7,1317.9 129.9,1318.4 133.5,636.6 114.3,636.8 108.6,97.0 452.2,99.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1508/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[333.0,1874.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55043080840564,39.33531379880688]}},{"type":"Feature","properties":{"resourceCoords":[903.0,1310.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54853779202165,39.335220979118006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1509/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1509","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1509/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1509","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1310.7,1871.3 414.6,1775.0 399.2,1792.0 246.5,1798.3 37.1,1800.9 55.8,392.4 58.8,160.6 164.1,160.2 1372.7,154.8 1360.2,368.0 1361.7,918.1 1352.1,1343.8 1357.7,1588.8 1352.6,1753.1 1353.8,1891.6 1310.7,1871.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1509/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[519.0,1779.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54631288267778,39.337914979328474]}},{"type":"Feature","properties":{"resourceCoords":[937.0,171.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54808148625969,39.34055674572215]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1510/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1510","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1510/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1510","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1129.0,1986.5 336.0,1916.2 166.1,1834.6 166.0,1696.0 172.2,1531.7 168.5,1286.5 181.2,860.7 183.7,310.2 197.8,97.0 686.0,95.1 817.1,94.6 992.5,93.9 1172.4,93.2 1210.0,93.1 1245.3,92.9 1281.6,248.2 1242.0,426.0 1194.2,541.9 1178.8,584.4 1175.1,594.9 1151.6,681.6 1130.0,880.0 1142.9,1011.1 1157.6,1091.8 1184.0,1174.0 1186.8,1183.2 1207.2,1251.1 1230.2,1331.1 1252.0,1443.2 1265.0,1604.0 1253.6,1742.6 1252.7,1902.9 1279.2,2020.4 1170.4,2020.6 1129.0,1986.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1510/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1130.0,880.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5445416,39.3411886]}},{"type":"Feature","properties":{"resourceCoords":[166.0,1696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5449175,39.3389472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1511/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1511","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1511/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1511","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"645.9,1915.5 605.3,1928.9 565.4,1936.6 500.6,1943.6 402.2,1933.9 359.2,1922.7 332.9,1913.5 275.2,1890.3 187.1,1871.6 110.3,1890.3 106.6,1328.7 107.0,1192.2 48.2,1191.1 74.5,1112.9 44.4,715.4 99.7,643.9 102.9,643.5 106.1,686.5 381.3,609.2 383.8,629.2 426.1,602.5 599.7,489.1 630.2,537.1 932.9,402.0 929.5,394.6 1172.9,427.8 1125.7,480.5 1217.8,567.9 1321.0,570.1 1375.7,649.0 1392.2,899.2 1360.8,1376.8 1382.2,1571.2 1330.8,1740.6 1295.2,1718.8 1191.9,1761.6 1073.7,1907.7 1065.2,1918.1 1064.5,1864.2 1006.5,1878.0 927.1,1878.3 858.4,1873.3 778.9,1880.5 723.5,1891.8 684.0,1903.6 645.9,1915.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1511/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[376.0,636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5403746842851,39.34467454427553]}},{"type":"Feature","properties":{"resourceCoords":[761.0,1866.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54346001418142,39.34067406632392]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1518/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1518","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1518/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1518","type":"ImageService3","width":1438,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"75.8,1856.0 76.2,1840.6 81.2,1814.7 213.7,1047.5 251.9,1037.9 284.1,829.6 333.6,818.2 369.0,613.3 223.9,284.8 545.8,141.7 587.2,123.8 1050.2,36.5 1047.6,29.3 1079.7,20.0 1108.8,18.0 1133.3,18.0 1172.0,87.2 1341.9,102.8 1344.8,313.3 1400.5,443.5 1426.1,717.8 1409.8,871.1 1325.6,1062.4 1331.1,1331.0 1368.3,1420.5 1380.5,1982.4 1084.7,2007.4 663.8,1983.3 634.5,1999.6 416.9,1889.7 417.6,1897.7 89.8,1926.5 76.7,1871.5 75.8,1856.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1518/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[694.0,1995.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5369118071024,39.34293868949483]}},{"type":"Feature","properties":{"resourceCoords":[1351.0,555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53090895308152,39.34635101086568]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1519/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1519","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1519/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1519","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.8,1981.5 51.4,1940.8 73.5,550.1 84.5,413.3 171.6,352.6 709.8,115.6 1125.3,707.8 1135.7,1126.4 1042.6,1168.4 1060.8,1592.5 808.1,1711.5 598.7,1814.0 268.3,1957.2 70.2,2006.0 95.8,1981.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1519/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1055.0,1165.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53589679421857,39.347360185460495]}},{"type":"Feature","properties":{"resourceCoords":[54.0,1603.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.53834197636975,39.34792955464777]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1520/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1520","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1520/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1520","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1231.8,17.0 1198.7,1594.0 1196.8,1647.5 1196.2,1713.8 822.4,1870.5 728.8,1907.8 731.2,1867.4 158.7,1919.8 168.1,1833.8 183.1,1814.0 221.6,416.7 291.1,356.0 492.4,316.1 831.1,187.5 1046.3,94.2 1231.8,17.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1520/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1202.0,1706.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5391706274521,39.3444361335661]}},{"type":"Feature","properties":{"resourceCoords":[772.0,1884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54021367398882,39.34465630477498]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1521/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1521","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1521/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1521","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"738.0,199.0 1259.9,89.7 1274.9,324.6 1292.2,1021.1 1293.4,1310.0 1286.6,1764.5 407.4,1891.9 148.8,1863.7 73.9,1788.0 44.3,1474.7 16.3,1477.4 20.0,1442.0 17.7,1440.8 18.6,1416.0 19.0,1416.0 20.0,1380.0 22.9,1358.5 29.0,1357.0 29.0,1339.0 25.7,1337.6 26.0,1335.4 29.0,1335.0 29.0,1313.0 13.5,1311.9 18.6,1290.0 19.0,1290.0 26.0,1283.0 24.5,1264.8 229.0,384.3 229.7,292.9 738.0,199.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1521/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[738.0,199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.533377,39.35002]}},{"type":"Feature","properties":{"resourceCoords":[218.0,1832.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.529706,39.348811]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1522/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1522","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1522/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1522","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.2,1477.0 223.9,1191.9 199.2,504.7 757.0,394.1 751.1,160.7 799.5,125.5 854.8,161.5 1308.0,474.0 1303.2,1922.3 748.9,1973.7 245.2,1922.8 226.4,1925.7 228.2,1477.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1522/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[762.0,2001.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5293186,39.3516948]}},{"type":"Feature","properties":{"resourceCoords":[1308.0,474.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.532765,39.352978]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1523/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1523","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1523/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1523","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,352.0 1.0,375.9 54.4,381.0 167.3,695.0 284.5,692.2 344.8,859.7 78.0,1586.0 112.5,1875.9 695.9,1843.8 1377.9,1666.3 1163.0,1202.0 929.9,728.5 1151.5,656.4 911.0,139.5 685.0,200.9 639.3,162.2 518.8,458.7 445.8,301.4 1.0,352.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1523/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[395.0,800.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5347571,39.351181]}},{"type":"Feature","properties":{"resourceCoords":[1163.0,1202.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.533377,39.35002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1524/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1524","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1524/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1524","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"180.6,1984.8 191.4,1691.0 191.3,1507.9 196.1,129.8 181.1,91.9 196.4,66.8 196.3,21.9 200.0,22.0 203.3,21.9 249.7,132.2 375.5,161.1 513.8,339.4 698.8,446.2 1022.5,189.1 1208.9,184.3 1233.1,313.3 1172.5,437.3 1333.0,776.5 1293.1,822.0 1375.2,959.8 1370.8,1124.4 1379.3,1134.3 180.6,1984.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1524/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[192.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5317227,39.3538554]}},{"type":"Feature","properties":{"resourceCoords":[1126.0,655.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.52907,39.353638]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1525/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1525","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1525/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1525","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"967.1,1936.0 451.5,1947.0 412.3,1946.5 124.8,1951.2 124.3,1819.8 126.3,1711.3 123.2,1620.1 123.4,1164.7 122.3,1004.9 121.9,850.4 123.3,694.1 172.8,707.5 243.5,737.9 231.2,337.5 223.4,337.9 203.8,69.0 273.6,74.8 409.6,76.7 494.4,79.5 515.1,85.2 875.2,51.1 987.0,82.2 985.5,130.3 1106.2,238.1 1353.7,197.0 1397.2,308.2 1385.2,693.4 1329.5,1031.3 1392.0,1514.5 1328.2,1919.8 1225.2,1965.4 983.2,1942.0 980.5,1945.2 967.1,1936.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1525/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[471.0,1179.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.54920135442612,39.33313155426133]}},{"type":"Feature","properties":{"resourceCoords":[125.0,1691.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55204942629896,39.3328849583139]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1526/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1526","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1526/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1526","type":"ImageService3","width":1440,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.2,1669.0 234.2,1641.6 200.8,1438.8 181.7,1333.8 264.9,1323.3 212.9,1141.9 196.8,1068.9 177.6,994.8 171.9,957.9 225.8,943.3 391.1,796.8 381.2,748.8 533.2,364.3 579.0,362.9 590.0,285.0 593.0,120.9 876.0,120.1 914.5,121.0 1422.2,117.0 1435.3,126.3 1347.8,226.3 1390.4,632.8 1361.7,952.1 1383.5,1202.5 1352.8,1254.4 1376.8,1300.0 1337.8,1344.6 1387.3,1973.6 1344.2,1994.8 1055.1,1948.5 549.8,2003.0 368.6,1962.6 315.4,2009.5 280.2,1890.7 274.9,1892.0 235.7,1676.7 60.5,1702.2 54.2,1669.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1526/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[583.0,365.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55386467731672,39.331721455428415]}},{"type":"Feature","properties":{"resourceCoords":[207.0,1141.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.55778222186949,39.33088945565359]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1527/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_034 p1527","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T06:52:30Z","modified":"2026-10-18T06:52:30Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1527/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1527","type":"ImageService3","width":1432,"height":2038},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1268.1,333.4 1262.5,554.5 1305.5,556.5 1294.6,566.8 1391.7,855.3 1370.0,1224.9 1275.6,1375.4 1339.8,1705.3 1271.6,1861.9 1181.9,1853.9 1028.2,1690.5 757.9,1883.3 435.8,1868.3 269.5,1768.1 163.5,1775.5 219.2,1507.4 133.2,1198.0 161.9,406.9 168.8,405.9 172.7,127.1 715.7,123.4 902.7,137.4 1080.2,133.0 1277.8,133.3 1268.1,333.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195011:03573_11_1950-1527/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[903.0,593.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5623617863281,39.32691522129685]}},{"type":"Feature","properties":{"resourceCoords":[516.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.56375689705128,39.32697205987186]}}]}}]}