{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn07578_003.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chester, Pennsylvania | 1898 | 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":"68"},{"label":"placed","value":"56"},{"label":"unplaced","value":"12"},{"label":"fit sources","value":"georef 29, georef-snap 23, snap:0 2, snap:1 1, georef-street 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"13 sheet(s) cut into 27 panels"},{"label":"unplaced pages","value":"p13__1 (tier 1, 39.84485,-75.36981 +/-100m); p23 (tier 2, 39.83068,-75.38765 +/-100m); p24__1 (tier 1, 39.83252,-75.38462 +/-258m); p24__2 (tier 1, 39.83282,-75.38234 +/-135m); p25 (tier 1, 39.83354,-75.38090 +/-267m); p29 (tier 1, 39.84061,-75.36827 +/-257m); p34__2 (tier 1, 39.86259,-75.36150 +/-131m); p41__2 (tier 1, 39.85100,-75.36172 +/-100m); p51__2 (tier 1, 39.85264,-75.35145 +/-100m); p53__1 (tier 3, 39.85287,-75.34197 +/-497m); p53__2 (tier 3, 39.85287,-75.34197 +/-497m); p7__2 (tier 1, 39.84047,-75.38016 +/-138m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p1","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.33"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0001","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.7,1259.2 70.2,947.3 69.1,684.1 66.7,181.0 21.9,177.8 91.9,39.7 808.8,26.5 1590.8,91.3 1598.8,659.3 1604.2,889.3 1610.0,1326.0 1617.5,1325.9 1630.7,1902.6 1533.5,1959.2 141.8,1946.7 52.4,1879.8 43.6,1259.6 71.7,1259.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[72.0,1326.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3964865,39.8274557]}},{"type":"Feature","properties":{"resourceCoords":[1610.0,1326.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3932433,39.8290881]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p10 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2724.4"},{"label":"split_canvas_w","value":"6768.0"},{"label":"split_canvas_h","value":"5191.6"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010","type":"ImageService3","width":1692,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"58.2,824.5 49.9,1792.1 54.1,1792.1 1103.8,1790.3 1630.7,1787.9 1626.0,1543.2 1628.1,1218.0 1625.3,1008.8 1644.8,1007.3 1654.0,927.2 1573.4,872.5 1612.1,788.5 1551.4,728.9 987.8,760.0 657.9,716.0 635.2,752.6 339.6,813.7 297.4,814.2 297.7,836.0 58.2,824.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1101.0,1379.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37376461751087,39.8417144743823]}},{"type":"Feature","properties":{"resourceCoords":[87.0,1790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37516914814694,39.840101503198035]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p10 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.43"},{"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":"6768.0"},{"label":"split_canvas_h","value":"2724.4"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010","type":"ImageService3","width":1692,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1631.8,102.5 1584.2,102.5 1570.0,129.4 886.3,41.4 269.9,118.6 203.9,39.6 37.0,550.0 45.4,671.1 191.0,671.1 205.0,671.1 217.8,671.1 238.0,671.1 264.0,671.1 265.0,680.1 595.0,680.1 594.8,613.2 1117.0,613.1 1116.9,680.1 1181.9,680.1 1371.5,680.1 1625.4,667.2 1626.0,613.1 1631.8,102.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0010__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1117.0,613.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3984263,39.8279466]}},{"type":"Feature","properties":{"resourceCoords":[1626.0,613.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3973798,39.828492]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p11 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2116.8"},{"label":"split_canvas_w","value":"6768.0"},{"label":"split_canvas_h","value":"5799.2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011","type":"ImageService3","width":1692,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1632.9,1867.2 1635.6,598.4 1112.2,605.7 66.0,595.9 66.2,1318.8 46.4,1318.9 48.7,1911.2 1107.6,1886.3 1108.0,1867.3 1632.9,1867.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1302.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37580477397952,39.83825262901764]}},{"type":"Feature","properties":{"resourceCoords":[1109.0,605.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37623258508278,39.83952982570717]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p11 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"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":"6768.0"},{"label":"split_canvas_h","value":"2116.8"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011","type":"ImageService3","width":1692,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"167.8,56.3 159.6,71.9 84.8,81.0 82.0,387.4 61.5,417.6 61.3,481.2 1625.0,481.2 1624.3,107.2 1624.3,47.7 1098.3,68.4 1098.5,93.1 581.6,94.7 581.6,77.8 167.8,56.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0011__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[581.0,481.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3842764,39.8365298]}},{"type":"Feature","properties":{"resourceCoords":[1625.0,481.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3821336,39.8376487]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p12 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2100.0"},{"label":"split_canvas_w","value":"6760.0"},{"label":"split_canvas_h","value":"5816.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012","type":"ImageService3","width":1690,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"87.9,596.3 79.5,1863.5 603.9,1865.9 864.8,1869.0 1380.2,1872.3 1637.7,1873.1 1645.5,1308.5 1642.8,1216.7 1653.6,861.8 1654.9,596.9 1131.3,597.7 87.9,596.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1128.0,601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37322765486422,39.84110565308434]}},{"type":"Feature","properties":{"resourceCoords":[104.0,601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37519231963019,39.84007496121126]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p12 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.59"},{"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":"6760.0"},{"label":"split_canvas_h","value":"2100.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012","type":"ImageService3","width":1690,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.0,479.0 345.6,480.0 601.4,477.9 867.8,480.3 1383.4,476.3 1645.0,479.0 1645.0,134.5 747.3,50.6 730.6,75.4 406.1,61.2 194.8,183.7 100.8,120.0 103.7,16.0 93.3,16.0 93.5,104.4 95.0,479.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0012__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[95.0,479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3821336,39.8376487]}},{"type":"Feature","properties":{"resourceCoords":[1645.0,479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.378954,39.8393014]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0013__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p13 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6752.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0013__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0013","type":"ImageService3","width":1688,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1372.7,1380.3 1362.3,1325.0 1430.1,746.5 1509.6,246.3 1539.5,35.5 1281.9,26.5 1038.3,16.3 916.0,16.0 915.7,11.2 913.6,11.1 913.0,16.0 855.0,16.0 853.0,11.0 852.0,16.0 643.0,17.0 642.0,1.0 502.2,1.0 182.6,1054.5 189.0,1241.2 527.1,1362.0 538.2,1362.0 538.2,1366.0 569.8,1377.2 635.3,1886.0 597.4,1960.2 676.1,1959.4 679.9,1978.0 882.4,1950.0 1197.6,1912.7 1434.2,1878.5 1372.7,1380.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0013__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[607.0,1449.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37220691389405,39.84333488810623]}},{"type":"Feature","properties":{"resourceCoords":[1413.0,1871.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37222895309552,39.84168255258781]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0014","type":"ImageService3","width":1688,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1508.8,1715.6 1516.8,1757.0 962.6,1839.4 873.2,1856.6 523.9,1902.7 264.3,1943.6 185.1,1442.8 172.7,1387.3 221.2,801.1 284.2,293.5 307.1,79.6 46.8,79.5 24.0,69.3 938.3,68.7 938.2,86.2 1188.8,84.8 1503.5,92.8 1493.5,1523.6 1537.8,1686.0 1544.1,1709.0 1508.8,1715.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[910.0,838.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36923564058226,39.841433650015055]}},{"type":"Feature","properties":{"resourceCoords":[910.0,1321.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37026015505553,39.84106529135115]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p15","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0015","type":"ImageService3","width":1688,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1657.5,143.2 1666.8,566.2 1661.8,1061.3 1663.2,1456.0 1668.2,1900.1 1114.0,1900.9 1114.0,1833.1 28.0,1551.3 80.9,1436.5 36.9,1010.5 70.9,181.7 182.2,83.8 1578.0,52.5 1657.5,143.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1115.0,1057.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3700085,39.8459681]}},{"type":"Feature","properties":{"resourceCoords":[564.0,87.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3721257,39.8471351]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0016","type":"ImageService3","width":1688,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1464.7,63.8 1475.5,286.2 1507.2,1085.1 1515.8,1931.9 1228.0,1939.3 409.4,1925.3 134.7,1917.8 137.2,1474.4 142.3,1080.3 155.5,586.2 153.2,163.7 75.5,71.9 1464.7,63.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[908.0,1096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36721322676217,39.84694215689143]}},{"type":"Feature","properties":{"resourceCoords":[1486.0,1436.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36564949414651,39.84684168498275]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0017","type":"ImageService3","width":1689,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"415.1,20.6 441.6,20.6 1521.3,77.4 1594.4,485.5 1644.5,1101.5 1613.8,1101.5 1610.4,1949.1 1211.5,1948.7 999.2,1954.9 779.0,1953.2 66.4,1947.5 72.5,1093.5 54.2,287.4 47.2,62.9 415.1,20.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[771.0,510.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.365119684652,39.8489137682987]}},{"type":"Feature","properties":{"resourceCoords":[76.0,1929.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3650832904438,39.846099161044826]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0018","type":"ImageService3","width":1686,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"156.0,1098.7 186.7,1100.8 178.6,484.0 133.5,72.7 166.7,76.7 1527.5,46.5 1533.2,35.2 1596.4,37.1 1662.8,88.8 1662.0,140.0 1662.8,140.4 1662.8,142.8 1662.0,143.0 1662.8,241.1 1603.1,326.6 1589.9,393.0 1597.1,541.9 1596.9,907.4 1602.8,1096.8 1616.3,1192.9 1625.2,1466.9 1642.3,1892.6 1029.0,1926.0 716.8,1945.7 518.7,1958.0 451.6,1958.0 99.2,1942.9 95.1,1942.6 156.0,1098.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1599.0,1115.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3598486335552,39.849930520581836]}},{"type":"Feature","properties":{"resourceCoords":[1599.0,1919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35889815504112,39.84869494550936]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0019","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"843.0,202.6 1655.3,206.2 1651.6,1037.0 1646.5,1503.2 1647.8,1804.3 1587.5,1807.2 1098.9,1797.2 552.5,1796.6 30.5,1796.0 25.6,197.3 570.4,198.7 843.0,202.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[32.0,921.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3684431701018,39.84341211177888]}},{"type":"Feature","properties":{"resourceCoords":[1097.0,1247.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3658413354014,39.84369051544161]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0002","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"167.1,42.7 190.5,45.1 190.5,95.8 1670.5,103.4 1669.8,1340.0 1659.6,1623.2 1654.5,1852.3 1617.7,1941.5 1540.0,1950.6 81.2,1929.7 55.6,1943.8 55.1,1334.8 47.2,1334.7 51.2,873.6 50.9,630.7 55.8,30.9 167.1,42.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[599.0,644.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3930917693185,39.83070514519133]}},{"type":"Feature","properties":{"resourceCoords":[1119.0,1341.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3911256086751,39.83019205283724]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p20","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0020","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"314.5,1492.6 319.0,1020.5 321.5,179.2 610.4,167.6 1320.0,151.0 1336.2,515.1 1367.2,724.3 1420.2,1164.7 1416.8,1470.3 1421.3,1743.1 873.2,1752.0 873.0,1670.2 642.7,1747.4 493.1,1781.3 316.3,1797.5 314.5,1492.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[316.0,1219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3646762,39.8441347]}},{"type":"Feature","properties":{"resourceCoords":[1320.0,151.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3636005,39.8466226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0021","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"377.5,1831.2 369.9,1519.9 370.9,1211.2 314.0,766.8 280.9,555.8 261.8,188.3 483.3,181.3 696.5,166.7 1101.7,151.2 1496.4,125.8 1370.2,843.1 1370.6,944.7 1388.2,1110.5 1402.8,1106.4 1447.5,1844.2 1356.4,1841.4 1209.8,1856.8 1209.2,1836.7 1165.8,1835.3 377.5,1831.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[354.0,1177.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36246413644736,39.84509589315709]}},{"type":"Feature","properties":{"resourceCoords":[260.0,205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36358828509152,39.84659432903501]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0022","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"93.2,1806.2 135.3,1063.5 120.1,1065.8 122.0,898.0 133.6,796.5 344.0,94.3 572.9,82.2 889.8,65.3 1512.2,37.6 1506.8,490.4 1507.4,879.0 1526.4,1177.8 1534.9,1441.5 1557.8,1879.1 1464.0,1910.0 1254.6,1938.8 904.9,1909.3 100.1,1807.2 93.2,1806.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1524.0,1922.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3565874204891,39.8459472558343]}},{"type":"Feature","properties":{"resourceCoords":[1524.0,63.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35878939613572,39.84874724907659]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.24"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0026","type":"ImageService3","width":1690,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.0,103.0 332.1,108.8 580.0,107.8 580.0,118.7 1615.2,138.8 1615.3,1774.6 1537.5,1818.0 567.8,1805.5 325.1,1882.2 161.3,1805.1 73.8,1641.5 25.1,394.8 26.0,212.0 65.0,196.9 65.0,103.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3790009,39.8340875]}},{"type":"Feature","properties":{"resourceCoords":[65.0,103.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3797612,39.8349432]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p27","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.33"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0027","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.7,126.7 1105.5,119.3 1106.2,100.9 1612.5,109.1 1614.8,143.7 1614.8,179.2 1614.0,233.1 1620.9,1843.1 1582.5,1816.2 968.5,1903.3 759.7,1819.5 494.6,1892.3 83.5,1791.6 63.0,1802.7 83.7,126.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1103.0,678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.373803,39.8367898]}},{"type":"Feature","properties":{"resourceCoords":[1602.0,678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37282,39.8373186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p28","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.42"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0028","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1660.5,169.9 1655.9,170.3 1600.1,248.6 1605.7,1360.7 1586.8,1438.1 1554.9,1413.1 1527.4,1436.8 1515.6,1805.1 914.9,1794.1 786.8,1884.4 456.8,1939.5 158.5,1899.2 88.7,1849.4 96.2,219.8 97.8,129.3 96.7,94.3 608.5,107.1 1117.0,123.0 1618.9,134.9 1660.4,134.5 1660.5,169.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[80.0,670.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37282,39.8373186]}},{"type":"Feature","properties":{"resourceCoords":[1117.0,123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3715694,39.8392302]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0003","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"575.0,84.2 1101.3,83.3 1594.1,82.5 1594.0,17.9 1611.4,32.8 1625.4,45.9 1641.8,82.4 1640.5,624.2 1642.1,988.6 1636.5,1319.4 1641.7,1319.4 1631.9,1852.9 1547.8,1942.7 676.1,1946.3 118.4,1905.5 29.4,1827.5 26.1,1835.6 29.6,1606.9 37.8,1324.3 30.2,90.0 575.0,84.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[566.0,626.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38993392148063,39.83237204281157]}},{"type":"Feature","properties":{"resourceCoords":[1606.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38860919414438,39.83427734901881]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p30","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0030","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"41.0,394.0 41.3,149.4 571.4,155.1 1108.5,160.7 1588.5,175.0 1647.8,172.8 1654.9,172.2 1643.4,493.9 1646.0,668.0 1651.3,668.0 1632.0,1656.7 1596.2,1785.4 1417.0,1837.9 1434.3,1886.7 876.6,1831.6 621.3,1839.7 488.4,1914.2 183.7,1906.8 95.0,1888.8 52.5,1722.6 68.1,1502.9 157.8,1399.7 175.3,1108.0 56.7,897.3 36.7,701.2 31.1,701.1 41.0,394.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[41.0,394.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3673611,39.841554]}},{"type":"Feature","properties":{"resourceCoords":[1646.0,668.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3636014,39.8423711]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0031","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"688.2,1952.9 507.0,1962.0 171.5,1961.7 151.7,1790.7 113.7,1640.2 30.1,1409.2 112.8,1406.9 90.5,852.8 126.4,851.4 117.8,61.9 118.5,21.0 239.0,21.0 239.4,12.8 240.6,12.7 241.0,21.0 993.0,21.0 985.2,39.0 1235.0,172.5 1467.5,173.7 1605.3,258.6 1617.3,1819.7 1552.8,1891.5 1664.1,1918.4 1664.1,1930.0 1664.1,1932.4 688.1,1947.4 688.2,1952.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[673.0,860.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36130750339396,39.84316604994879]}},{"type":"Feature","properties":{"resourceCoords":[673.0,1947.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.36360287041947,39.84239998180101]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0032","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"21.5,1848.1 21.2,1797.1 34.3,1697.4 124.2,875.8 148.1,519.0 115.2,306.2 101.3,266.4 120.5,263.8 111.5,185.8 81.0,71.0 216.1,149.4 476.3,74.6 1186.5,80.4 1409.4,209.8 1527.9,161.2 1506.4,338.4 1573.9,377.6 1606.4,586.1 1626.2,1672.5 1526.3,1813.2 1403.7,1760.1 970.5,1915.1 933.9,1978.0 609.0,1978.0 608.0,1968.0 590.0,1968.0 589.0,1978.0 555.0,1978.0 554.0,1960.0 519.0,1960.0 515.0,1978.0 515.0,1960.0 375.0,1960.0 374.0,1966.0 373.0,1960.0 307.0,1960.0 306.6,1968.1 243.2,1963.7 243.0,1960.0 193.1,1960.2 21.9,1948.3 21.5,1848.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[667.0,823.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35710148014999,39.84463850915753]}},{"type":"Feature","properties":{"resourceCoords":[131.0,1725.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35946133207783,39.844656998773736]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p33","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0033","type":"ImageService3","width":1684,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"24.4,1870.4 24.1,1818.2 31.4,1819.0 53.1,491.3 159.4,280.1 82.6,164.2 558.9,148.7 1025.5,26.1 1487.0,64.7 1483.8,136.0 1543.7,519.4 1546.0,547.7 1546.0,1867.0 24.4,1870.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1546.0,666.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.393278,39.8344094]}},{"type":"Feature","properties":{"resourceCoords":[1546.0,1867.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3917145,39.8326352]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p34 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6756.0"},{"label":"split_canvas_h","value":"3982.4"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034","type":"ImageService3","width":1689,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1602.9,920.1 1628.1,417.0 1564.5,150.0 1118.3,155.2 986.2,53.9 862.9,65.9 748.5,174.5 482.4,155.0 404.7,257.3 301.8,229.6 140.7,347.7 245.0,551.9 176.9,684.2 392.1,803.0 339.0,906.3 605.6,896.1 607.3,889.7 829.4,898.2 1068.0,911.6 1388.6,916.6 1583.9,919.6 1602.9,920.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[753.0,343.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3605007,39.8635141]}},{"type":"Feature","properties":{"resourceCoords":[1068.0,911.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3592267,39.8628595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p34 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3382.4"},{"label":"split_canvas_y","value":"3953.2"},{"label":"split_canvas_w","value":"3373.6"},{"label":"split_canvas_h","value":"3962.8"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034","type":"ImageService3","width":1689,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.0,1860.0 1659.5,1833.4 1634.0,1828.2 1586.2,1327.1 1540.2,1325.8 1560.4,994.5 1527.6,994.2 1521.6,1004.9 1001.4,1108.6 900.8,1229.7 971.7,1854.5 1269.3,1816.3 1441.0,1860.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0034__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[845.6,988.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36763230620812,39.85794063827864]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,988.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.3660131716854,39.858697246465596]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36486398680492,39.857227553954]}},{"type":"Feature","properties":{"resourceCoords":[845.6,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36648312132765,39.85647094576704]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0035","type":"ImageService3","width":1689,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1605.0,981.6 1654.1,1054.8 1627.8,1064.9 1596.1,1871.6 1546.9,1835.8 1529.3,1930.2 1374.5,1836.1 1124.2,1836.8 1100.5,1948.2 1066.4,1737.6 1062.4,1762.5 578.8,1827.9 579.4,1872.5 257.6,1865.6 258.6,1897.3 74.0,1803.7 113.0,1608.3 49.9,1113.7 114.5,715.6 58.8,598.0 62.5,279.1 118.2,162.4 24.1,105.1 24.0,44.3 586.9,63.9 1324.1,178.5 1555.5,224.0 1622.2,237.1 1605.0,981.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0035/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36276262763572,39.86058807250617]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36087470472711,39.85794376504525]}},{"type":"Feature","properties":{"resourceCoords":[1689.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36488264392842,39.85623372070637]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.36677056683703,39.85887802816729]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p36","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0036","type":"ImageService3","width":1691,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"135.9,209.7 879.3,189.9 886.4,142.8 1373.2,189.2 1290.8,277.9 1578.0,206.7 1577.0,209.3 1579.1,511.6 1568.0,869.0 1566.6,1447.2 1516.4,1446.9 882.4,1699.6 881.0,1852.0 880.9,1861.7 417.8,1744.3 431.0,1714.5 163.2,1599.8 72.0,1564.4 128.9,1455.5 73.2,1208.5 120.2,1130.3 105.3,354.8 65.1,262.4 135.9,209.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[881.0,1852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3597225,39.855189]}},{"type":"Feature","properties":{"resourceCoords":[1568.0,869.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3593,39.8573002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0037","type":"ImageService3","width":1696,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"168.1,179.6 325.1,155.4 519.9,261.1 909.0,147.8 1182.4,267.0 1342.8,236.0 1421.2,78.9 1557.1,283.7 1577.7,282.9 1556.3,440.2 1513.8,628.6 1466.0,770.9 1454.9,1389.6 1470.6,1390.0 1462.8,1714.1 910.0,1848.3 808.5,1846.7 778.2,1856.8 768.0,1882.8 478.0,1953.2 561.5,1864.2 70.9,1815.1 74.1,1794.5 110.8,1558.7 197.0,809.0 194.6,239.7 133.4,242.5 147.2,217.5 168.1,179.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[771.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35998639862788,39.858422197062495]}},{"type":"Feature","properties":{"resourceCoords":[1457.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35857360216659,39.85896273839972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p38","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0038","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.9,1842.6 229.0,1218.5 274.4,1074.1 313.6,883.3 332.0,724.3 311.3,725.5 170.2,521.7 193.4,472.9 154.3,249.8 182.1,191.3 457.4,172.1 459.0,165.3 688.8,166.9 936.0,173.0 1267.6,167.7 1444.5,164.8 1469.7,164.4 1487.5,164.3 1489.3,164.2 1487.5,260.0 1598.7,474.7 1482.4,845.7 1467.5,1801.9 1433.6,1811.9 1385.0,1829.1 1246.8,1830.0 1197.5,1815.9 945.0,1818.2 870.9,1815.5 472.6,1823.3 276.9,1820.2 245.7,1842.7 229.9,1842.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[936.0,715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3586966,39.8620018]}},{"type":"Feature","properties":{"resourceCoords":[936.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3592267,39.8628595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p39","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0039","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"170.2,555.6 199.9,545.4 300.1,545.9 843.5,407.4 847.7,87.7 878.4,65.9 1069.7,70.5 1459.2,66.1 1531.7,69.3 1533.2,408.2 1529.0,550.0 1521.9,550.0 1529.6,1241.5 1529.9,1524.0 1526.2,1813.8 1186.3,1815.3 848.5,1814.4 157.0,1815.0 154.7,1240.0 163.4,884.6 159.4,584.0 170.2,555.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[849.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3578399,39.8578392]}},{"type":"Feature","properties":{"resourceCoords":[1529.0,550.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3571157,39.8594857]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0004","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"21.8,101.0 21.9,64.7 49.8,90.5 572.2,35.8 1610.5,80.5 1646.7,26.8 1646.8,92.6 1650.1,1325.6 1653.4,1856.3 1644.4,1842.5 1544.4,1951.8 233.7,1944.5 115.8,1935.9 47.0,1854.4 34.7,1867.7 42.5,1335.3 37.4,1335.4 41.9,1005.2 39.0,641.6 38.4,101.0 21.8,101.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[577.0,635.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38674613809481,39.83404491387939]}},{"type":"Feature","properties":{"resourceCoords":[1099.0,1334.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38477225175923,39.83351311022381]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p40","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0040","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1542.1,1597.8 1543.0,1893.3 849.4,1888.7 849.3,1826.4 310.2,1828.5 313.4,1535.9 312.7,1250.8 303.9,553.0 311.0,553.0 315.0,409.9 312.9,67.9 562.1,67.2 610.6,81.5 618.9,81.5 747.1,81.5 795.1,64.8 829.3,55.0 908.4,84.6 856.4,105.2 1658.2,185.2 1658.4,214.5 1640.0,218.7 1607.0,287.1 1620.3,994.0 1558.3,1419.8 1563.1,1597.8 1542.1,1597.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[311.0,553.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3571157,39.8594857]}},{"type":"Feature","properties":{"resourceCoords":[1541.0,1248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3538559,39.8593232]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0041__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p41 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"10"},{"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":"6732.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0041__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0041","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"752.7,48.6 178.3,91.3 65.7,290.4 122.8,1786.8 75.1,1901.8 138.6,1898.2 347.5,1886.3 338.4,1901.7 1204.6,1940.2 1204.5,1904.2 1568.0,1903.0 1568.0,1401.9 1571.6,1125.7 1568.0,755.0 1568.2,522.3 1568.0,339.6 1101.8,226.1 1114.7,195.9 844.6,83.3 752.7,48.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0041__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1568.0,755.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3592971,39.8545097]}},{"type":"Feature","properties":{"resourceCoords":[1568.0,1903.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3581481,39.8526753]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p42","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0042","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"147.0,721.0 148.5,568.3 784.0,315.7 834.2,316.0 1531.0,320.6 1518.8,1801.2 136.2,1790.2 142.5,1514.7 142.7,1145.0 145.2,912.9 147.0,721.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[833.0,1150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3578584,39.8550447]}},{"type":"Feature","properties":{"resourceCoords":[147.0,721.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3597225,39.855189]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p43","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0043","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"603.0,251.6 943.2,249.5 1477.8,247.4 1478.2,454.1 1479.3,1042.8 1519.5,1102.3 1583.2,1132.7 1306.9,1720.8 266.0,1722.0 264.8,251.2 603.0,251.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[939.0,1079.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3550049,39.8561057]}},{"type":"Feature","properties":{"resourceCoords":[266.0,1722.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3557671,39.8545461]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p44","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0044","type":"ImageService3","width":1689,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"385.8,1132.8 321.8,1102.6 281.2,1042.9 278.4,452.2 277.7,306.8 968.1,309.1 966.3,15.0 987.2,15.0 989.8,101.5 1194.5,199.5 1406.3,124.8 1508.3,156.8 1594.0,608.7 1489.1,1003.0 1534.8,1100.3 1483.0,1629.0 1544.1,1718.3 973.0,1720.0 732.3,1723.8 110.2,1723.9 385.8,1132.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[973.0,1070.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3524302,39.857073]}},{"type":"Feature","properties":{"resourceCoords":[973.0,1720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3517784,39.8560274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0045","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"266.4,1522.8 215.4,1252.3 187.2,1159.0 152.2,972.0 96.2,609.2 66.2,462.6 69.1,394.6 115.2,300.6 91.8,149.4 17.9,108.4 225.0,82.3 217.0,98.2 1081.8,77.4 1079.2,41.7 1411.4,17.8 1441.1,17.9 1481.0,490.4 1526.8,1095.5 1537.2,1202.3 1542.4,1255.5 1560.0,1330.0 1632.3,1579.0 852.0,1822.1 348.8,1942.6 266.4,1522.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[854.0,1852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35783416687674,39.84925727246802]}},{"type":"Feature","properties":{"resourceCoords":[1127.0,548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35836619964931,39.85158967022054]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p46","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0046","type":"ImageService3","width":1681,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1529.9,128.4 1514.5,1778.2 1279.0,1774.0 1029.3,1775.6 834.3,1767.8 833.5,1800.4 139.2,1814.0 139.2,1810.1 137.3,1702.5 140.0,1094.3 137.9,616.6 143.7,115.6 1529.9,128.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[841.0,122.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3571996,39.8540144]}},{"type":"Feature","properties":{"resourceCoords":[1279.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3546003,39.8517338]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p47","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0047","type":"ImageService3","width":1681,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"145.3,206.2 1186.0,145.5 1129.2,287.8 1582.0,528.0 1159.0,1335.0 1569.0,1553.9 1463.1,1760.8 1456.3,1784.7 1436.5,1853.6 341.1,1864.8 353.0,1835.7 240.4,1840.4 145.3,206.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1159.0,1335.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3525824,39.8533744]}},{"type":"Feature","properties":{"resourceCoords":[1582.0,528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3523905,39.8549959]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p48","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0048","type":"ImageService3","width":1677,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"726.5,187.4 965.3,172.7 1532.3,145.0 1496.4,569.4 1576.0,921.5 1579.4,1723.1 1656.5,1772.0 1656.3,1794.8 1656.1,1816.0 883.4,1894.6 883.2,1881.9 346.8,1910.0 364.4,1850.5 371.4,1826.8 478.5,1621.6 72.0,1400.2 500.0,600.0 51.0,357.0 108.8,215.8 726.5,187.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3523905,39.8549959]}},{"type":"Feature","properties":{"resourceCoords":[51.0,357.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3535783,39.8550833]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0049","type":"ImageService3","width":1680,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"97.0,1959.7 20.0,1959.0 19.8,1940.0 75.8,1928.0 99.7,1491.6 119.5,1229.2 132.4,930.8 173.3,545.4 227.0,96.8 748.1,115.3 1571.2,89.4 1577.5,744.6 1583.0,813.0 1589.7,916.3 1578.5,1878.3 847.9,1803.0 476.9,1924.4 244.6,1901.4 212.2,1944.0 97.0,1959.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[694.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35798700251486,39.8492719321572]}},{"type":"Feature","properties":{"resourceCoords":[694.0,1781.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.35564603362681,39.846909203100026]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0005","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1651.8,80.7 1644.3,375.4 1644.2,620.0 1648.8,1321.1 1650.2,1863.2 1650.6,1960.0 1640.3,1960.1 1601.6,1960.2 1600.1,1927.9 170.7,1950.6 78.7,1941.9 26.9,1861.4 24.4,1327.4 23.1,86.7 1651.8,80.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[562.0,624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38356240824241,39.83570930685818]}},{"type":"Feature","properties":{"resourceCoords":[1593.0,624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38152573983598,39.836764452514736]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p50 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.65"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4694.0"},{"label":"split_canvas_w","value":"6748.0"},{"label":"split_canvas_h","value":"3222.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"151.3,1760.9 231.0,1791.0 178.6,1811.3 986.5,1895.4 1013.6,1918.8 1159.4,1886.3 1416.7,1917.9 1550.3,1695.2 1606.0,1756.0 1632.8,1718.2 1609.1,1503.8 1490.3,1344.7 1258.8,1207.2 1039.6,1202.4 989.8,1305.1 647.4,1308.3 480.6,1371.2 163.5,1234.5 150.7,1761.1 151.3,1760.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1173.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.35743644801322,39.86150153888112]}},{"type":"Feature","properties":{"resourceCoords":[1687.0,1173.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.35395766317879,39.86280560000778]}},{"type":"Feature","properties":{"resourceCoords":[1687.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.35315167066743,39.86152080325919]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.35663045550186,39.86021674213253]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p50 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"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":"6748.0"},{"label":"split_canvas_h","value":"4694.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050","type":"ImageService3","width":1687,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"177.4,45.2 171.4,121.5 164.0,380.9 143.9,1031.3 146.6,1099.3 149.1,1163.5 180.9,1163.5 250.7,1079.2 396.9,1140.8 1309.3,1146.0 1335.9,1172.5 1363.7,1172.5 1375.2,1172.5 1482.6,1019.2 1488.9,591.1 1501.8,508.5 1557.2,410.2 1642.7,305.2 1533.0,276.5 1305.1,218.6 1062.0,163.1 874.2,110.9 865.9,142.3 272.9,15.0 258.0,15.0 257.8,11.8 235.5,7.0 235.0,15.0 184.0,15.2 177.4,45.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0050__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[164.0,380.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.356395,39.8502208]}},{"type":"Feature","properties":{"resourceCoords":[1486.0,869.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.353318,39.8510472]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0051__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p51 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.04"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6732.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0051__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0051","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"197.7,963.6 110.4,1182.6 194.0,1234.4 91.7,1666.0 181.4,1803.1 390.1,1924.9 665.0,1912.6 623.5,1874.9 617.0,1842.8 690.7,1823.3 910.0,1829.8 917.6,1889.2 1044.1,1914.7 1099.5,1821.6 1046.2,1517.0 1108.9,1390.4 1109.6,1390.3 1109.6,1389.9 1113.8,1389.8 1580.6,1336.4 1615.9,1113.2 1541.8,1112.9 1446.1,532.1 1357.8,535.9 1374.0,273.9 1378.0,263.0 173.9,194.1 124.3,296.3 90.1,414.8 97.0,506.1 197.7,963.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0051__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1414.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3515494,39.852879]}},{"type":"Feature","properties":{"resourceCoords":[189.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3538708,39.8519971]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p52 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"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":"3858.0"},{"label":"split_canvas_w","value":"6740.0"},{"label":"split_canvas_h","value":"4058.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1617.6,1735.5 1633.9,1280.8 1557.0,1038.7 216.3,1008.9 72.5,1126.2 147.8,1187.0 174.9,1448.9 132.4,1680.9 77.7,1783.1 511.8,1808.0 511.6,1825.7 1054.0,1826.9 1053.8,1801.0 1605.9,1782.3 1617.0,1752.2 1617.6,1735.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[517.0,1054.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3858384,39.8382996]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,1054.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3837101,39.8394238]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p52 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.82"},{"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":"6740.0"},{"label":"split_canvas_h","value":"3858.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052","type":"ImageService3","width":1685,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"423.0,963.5 430.2,916.7 1248.5,893.4 1478.2,798.0 1541.8,379.6 1513.4,169.3 742.5,205.1 743.0,192.4 209.3,190.9 202.7,209.5 189.0,445.2 268.4,441.5 356.4,963.5 423.0,963.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0052__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[731.0,445.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3501614,39.8527267]}},{"type":"Feature","properties":{"resourceCoords":[189.0,445.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3513062,39.852296]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p54","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0054","type":"ImageService3","width":1681,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.2,72.7 145.8,17.8 400.1,28.8 405.9,59.9 455.8,39.8 515.7,44.5 641.1,112.0 874.7,126.9 1270.7,36.0 1599.1,70.5 1618.9,1735.5 1663.4,1777.3 1663.3,1808.2 1663.2,1844.2 1162.8,1843.5 628.5,1842.8 75.2,1847.0 79.9,546.4 77.8,518.5 20.1,140.3 22.6,89.4 24.0,85.0 23.5,70.0 54.2,72.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[631.0,665.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.392201753219,39.834968642694804]}},{"type":"Feature","properties":{"resourceCoords":[1154.0,1870.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38958385446047,39.833700579235156]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0006","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"299.3,94.7 563.9,91.6 839.3,93.0 1372.5,87.0 1643.0,88.8 1645.0,613.5 1647.7,1313.9 1628.5,1314.1 1632.7,1892.8 570.7,1880.0 570.6,1868.8 316.2,1871.7 42.3,1867.8 39.7,1328.5 33.7,631.1 33.4,387.7 40.2,94.6 299.3,94.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[63.0,631.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.38137181675589,39.83685300933799]}},{"type":"Feature","properties":{"resourceCoords":[1618.0,631.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37827957947725,39.838447777048394]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0007__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p7 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.85"},{"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":"6732.0"},{"label":"split_canvas_h","value":"7916.0"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0007__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0007","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1041.8,1863.4 1041.9,1832.2 1566.1,1802.0 1565.5,1654.3 1569.1,1074.2 1572.7,97.7 1550.9,157.0 1326.6,68.5 911.3,152.9 928.2,1017.9 826.0,1141.0 796.2,1152.5 796.2,1156.3 785.7,1156.5 540.9,1249.8 185.1,1273.7 75.0,1556.8 127.9,1748.7 81.8,1816.4 1041.7,1908.5 1041.8,1863.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0007__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1045.0,578.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3811601,39.8418031]}},{"type":"Feature","properties":{"resourceCoords":[1571.0,578.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3801531,39.8423294]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p8","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0008","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.8,46.1 251.0,24.1 1577.3,64.6 1625.0,1046.8 1528.2,1510.5 1596.1,1556.2 1626.4,1711.0 1667.2,1716.3 1667.0,1744.4 1661.8,1752.8 1661.0,1753.0 1661.0,1754.2 1372.3,1815.2 1331.0,1816.0 1278.8,1835.0 66.0,1781.8 64.6,1629.4 64.9,1060.7 63.1,103.3 83.8,46.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0008/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.3810355,39.8431287]}},{"type":"Feature","properties":{"resourceCoords":[1683.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.3777367,39.8448321]}},{"type":"Feature","properties":{"resourceCoords":[1683.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.375128,39.841853799999996]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1979.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.3784268,39.8401504]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p9 [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":"2750.4"},{"label":"split_canvas_w","value":"6732.0"},{"label":"split_canvas_h","value":"5165.6"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.0,1796.3 1095.2,1797.7 1611.7,1786.2 1610.7,828.2 566.0,788.0 565.9,780.4 45.7,816.1 46.0,847.0 49.5,1257.6 54.0,1796.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[62.0,1238.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37895447618634,39.839342539372794]}},{"type":"Feature","properties":{"resourceCoords":[1591.0,1801.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.37525837220043,39.84001869533717]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chester, Pennsylvania | 1898 | sanborn07578_003 p9 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.33"},{"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":"6732.0"},{"label":"split_canvas_h","value":"2750.4"}],"created":"2026-10-18T19:56:06Z","modified":"2026-10-18T19:56:06Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009","type":"ImageService3","width":1683,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1616.3,153.4 1360.5,166.4 1103.9,166.4 1104.0,98.9 577.7,99.0 577.9,166.4 245.3,166.4 244.3,157.4 24.0,157.4 156.6,182.8 48.1,393.2 56.0,648.1 1581.5,684.5 1581.5,686.6 1610.2,686.6 1613.9,367.9 1616.3,153.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824cm:g3824cm_g075781898:07578_1898-0009__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1104.0,99.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3984263,39.8279466]}},{"type":"Feature","properties":{"resourceCoords":[1617.0,99.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.3973798,39.828492]}}]}}]}