{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn07496_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Altoona, Pennsylvania | 1894 | 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":"49"},{"label":"placed","value":"42"},{"label":"unplaced","value":"7"},{"label":"fit sources","value":"georef 26, georef-snap 14, snap:2 1, snap:1 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"7 sheet(s) cut into 15 panels"},{"label":"unplaced pages","value":"p19 (tier 1, 40.51280,-78.39945 +/-257m); p20__1 (tier 1, 40.52343,-78.39413 +/-202m); p20__2 (tier 1, 40.52330,-78.39472 +/-214m); p40__3 (tier 1, 40.52662,-78.39028 +/-147m); p41__1 (tier 3, 40.52058,-78.39982 +/-533m); p41__2 (tier 1, 40.52192,-78.39786 +/-112m); p4__2 (tier 4, 40.51173,-78.40094 +/-2224m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0001","type":"ImageService3","width":1667,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1518.0,112.6 1334.2,64.2 204.6,130.9 85.4,500.7 128.8,584.1 51.7,703.3 50.9,1252.6 1.0,1392.5 1.0,1425.7 155.7,1645.2 185.3,1729.3 260.2,1747.0 1485.4,1745.7 1514.6,1652.0 1525.0,1582.2 1524.5,1069.2 1522.4,598.4 1517.1,363.6 1518.0,112.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[824.0,1077.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4075893,40.5162907]}},{"type":"Feature","properties":{"resourceCoords":[824.0,139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4092275,40.5173947]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p10","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0010","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"155.4,28.6 150.9,258.1 163.1,485.9 148.6,486.1 141.3,723.3 148.1,723.3 167.2,930.5 136.1,929.9 147.3,1408.6 134.5,1408.6 143.7,1831.2 118.0,1831.1 98.5,1931.5 118.0,1931.0 122.0,1948.0 158.0,1948.0 158.0,1940.0 172.0,1938.0 173.0,1931.0 251.0,1931.0 252.0,1948.0 258.0,1948.0 259.0,1931.0 386.0,1931.0 387.0,1948.0 417.0,1948.0 417.0,1940.0 433.0,1931.0 512.0,1931.0 513.0,1948.0 649.0,1948.0 650.0,1932.0 671.0,1932.0 675.0,1948.0 676.0,1932.0 698.0,1931.0 734.0,1932.0 735.0,1938.0 769.0,1932.0 770.0,1948.0 773.0,1931.0 821.0,1931.0 822.0,1936.0 842.0,1933.0 848.0,1936.0 848.0,1948.0 873.0,1948.0 874.0,1935.0 899.0,1937.0 904.0,1931.0 926.0,1933.0 927.0,1948.0 936.0,1948.0 937.0,1933.0 969.0,1937.0 970.0,1948.0 983.0,1948.0 983.0,1939.0 994.0,1938.0 995.0,1931.0 1017.0,1932.0 1018.0,1948.0 1187.0,1948.0 1187.0,1930.0 1582.9,1928.2 1555.5,1818.1 1507.1,1823.2 1507.0,1212.5 1504.7,947.0 1513.3,485.0 1512.6,264.0 1507.0,27.8 1498.0,19.0 1497.5,8.8 1462.8,1.0 1454.2,1.0 1337.0,29.6 827.0,35.0 155.4,28.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[827.0,1409.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4021213,40.5149905]}},{"type":"Feature","properties":{"resourceCoords":[827.0,35.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4040344,40.5170263]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p11","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0011","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"145.1,1837.7 144.7,1222.2 142.1,954.5 150.6,488.8 149.8,266.1 145.3,81.3 841.2,104.6 839.8,195.8 1366.7,179.8 1389.4,932.5 1395.0,1199.0 1424.7,1198.3 1434.0,1646.9 1352.1,1648.8 1636.3,1874.7 1636.0,1927.0 1187.0,1929.0 1186.0,1948.0 1017.0,1948.0 1016.0,1934.0 997.0,1934.0 995.0,1948.0 964.0,1947.0 964.0,1931.0 946.0,1930.0 936.0,1933.0 935.0,1932.0 885.0,1937.0 884.0,1948.0 848.0,1948.0 848.0,1936.0 842.0,1932.0 825.0,1932.0 822.0,1936.0 821.0,1931.0 773.0,1931.0 770.0,1948.0 769.0,1931.0 740.0,1935.0 735.0,1931.0 688.0,1931.0 686.0,1948.0 671.0,1948.0 670.0,1939.0 651.0,1939.0 650.0,1948.0 517.0,1948.0 516.0,1931.0 425.0,1932.0 424.0,1939.0 417.0,1940.0 417.0,1948.0 368.0,1948.0 367.0,1931.0 266.0,1930.0 258.0,1933.0 258.0,1948.0 252.0,1948.0 252.0,1932.0 248.0,1930.0 218.2,1930.4 193.8,1832.5 145.1,1837.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1395.0,1199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3986828,40.5173475]}},{"type":"Feature","properties":{"resourceCoords":[144.0,28.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4027191,40.5177568]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0012","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"507.2,99.1 947.2,91.7 1332.5,88.7 1340.7,138.1 1486.6,100.9 1507.8,266.1 1573.9,325.5 1611.0,863.4 1599.7,1355.3 1502.9,1495.2 1636.5,1603.6 1276.3,1755.6 1288.2,1795.9 469.6,1913.3 32.7,1545.0 113.8,1545.5 117.4,1101.7 88.0,1101.5 90.0,837.8 89.0,93.0 507.2,99.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[515.0,1104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3978617,40.517815]}},{"type":"Feature","properties":{"resourceCoords":[89.0,93.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4001445,40.5188165]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p13","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0013","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1492.7,967.9 1489.8,1202.5 1484.2,1675.2 1531.0,1675.1 1457.3,1925.0 518.3,1907.7 376.3,1933.9 320.0,1933.0 319.2,1944.4 314.8,1945.2 314.0,1933.0 203.4,1928.7 49.8,1823.9 66.3,1818.5 62.3,1108.1 144.2,1017.5 92.5,900.6 170.0,697.2 152.9,485.7 70.5,362.8 119.0,116.2 244.1,23.5 1503.8,34.3 1492.7,967.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[895.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4137625,40.5007371]}},{"type":"Feature","properties":{"resourceCoords":[218.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4146662,40.4997124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p14","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"26"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0014","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1315.2,19.0 1479.4,19.0 1509.8,1623.7 1512.7,1774.7 1514.2,1853.3 1570.8,1851.0 1630.9,1930.0 1166.0,1932.0 1165.0,1948.0 1077.0,1948.0 1076.0,1935.0 1037.0,1932.0 1036.0,1948.0 1018.0,1948.0 1017.0,1932.0 903.0,1932.0 898.0,1937.0 897.0,1933.0 853.0,1932.0 852.0,1948.0 848.0,1948.0 848.0,1936.0 843.0,1932.0 825.0,1932.0 823.0,1936.0 816.0,1932.0 773.0,1932.0 770.0,1948.0 769.0,1933.0 690.0,1932.0 650.0,1933.0 649.0,1948.0 605.2,1948.0 602.0,1943.1 601.0,1938.0 598.7,1938.0 576.3,1903.6 61.0,1909.2 126.3,1661.0 80.2,1662.5 72.2,1196.5 68.2,965.3 52.2,45.2 1315.2,19.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[825.0,948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4119179,40.5027932]}},{"type":"Feature","properties":{"resourceCoords":[76.0,1419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.412044,40.5011601]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p15","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"34"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0015","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1360.4,261.8 1354.2,502.1 1354.3,964.1 1505.8,962.3 1505.0,1437.0 1507.2,1667.8 1502.5,1884.3 1087.7,1886.5 1087.5,1941.5 1076.0,1935.0 1059.0,1935.0 1058.0,1941.1 1056.0,1932.0 1037.0,1932.0 1036.5,1940.8 1018.5,1940.6 1018.0,1932.0 903.0,1932.0 899.0,1937.0 897.0,1932.0 873.0,1935.0 873.0,1938.7 849.0,1938.3 849.0,1936.0 842.0,1933.0 773.0,1933.0 772.6,1934.8 769.1,1934.8 769.0,1933.0 650.0,1933.0 603.0,1948.0 601.0,1937.0 589.2,1937.7 583.0,1933.0 424.0,1932.0 335.8,1931.6 260.0,1931.0 251.0,1931.1 227.0,1931.0 206.2,1902.6 148.5,1903.9 148.2,1669.8 146.0,30.8 1288.7,27.3 1346.7,42.6 1360.4,261.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[825.0,965.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4100839,40.5048343]}},{"type":"Feature","properties":{"resourceCoords":[1505.0,1437.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4082365,40.5053657]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0016","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1551.7,478.0 1638.0,478.1 1638.0,466.4 1638.0,465.1 1380.2,142.1 1573.5,170.2 1568.2,163.6 1423.2,137.0 934.8,84.9 673.3,138.7 256.2,29.3 270.4,248.9 264.6,489.6 265.5,952.3 417.2,950.2 417.2,1425.7 419.9,1656.9 415.6,1873.8 1.0,1876.7 1.0,1931.8 45.0,1932.3 45.0,1932.0 154.0,1930.0 154.2,1933.6 174.1,1933.8 176.0,1930.0 251.0,1930.0 251.2,1934.7 256.0,1934.8 256.0,1933.0 260.0,1930.0 386.0,1931.0 386.3,1936.2 424.3,1936.7 425.0,1932.0 584.0,1933.0 599.0,1938.0 601.0,1938.0 601.1,1938.7 650.0,1932.0 677.4,1931.9 696.0,1931.0 750.1,1931.8 772.9,1931.7 773.0,1931.0 822.0,1931.0 822.1,1931.5 838.2,1931.5 840.0,1931.0 852.4,1931.5 903.4,1931.3 904.0,1931.0 913.8,1931.3 937.0,1931.2 937.0,1931.0 969.0,1931.2 988.0,1931.0 1017.0,1931.0 1036.0,1931.0 1057.0,1931.0 1058.0,1936.0 1076.0,1936.0 1076.7,1944.2 1165.0,1945.2 1165.0,1933.0 1171.0,1930.0 1354.6,1929.2 1636.3,1682.0 1636.5,1638.9 1584.6,1639.1 1546.0,1418.8 1309.0,1418.7 1308.5,1383.6 1556.2,1207.3 1495.5,1183.5 1480.8,478.0 1551.7,478.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[417.0,1416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40825595361082,40.50537531493161]}},{"type":"Feature","properties":{"resourceCoords":[1175.0,473.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40907912949407,40.50747557582023]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0017","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"254.9,451.6 184.3,450.5 189.0,1153.0 249.0,1177.5 1.0,1348.8 1.0,1384.5 235.9,1387.9 271.2,1607.8 322.9,1608.3 322.1,1651.2 17.5,1910.8 897.0,1933.0 897.2,1933.5 902.4,1933.6 903.0,1933.0 969.0,1932.0 969.8,1935.3 981.6,1935.7 986.0,1932.0 1017.0,1933.0 1017.2,1936.6 1035.7,1937.0 1036.0,1932.0 1056.0,1932.0 1056.3,1937.6 1058.0,1935.0 1078.0,1935.0 1078.2,1938.2 1101.0,1932.0 1121.0,1932.0 1121.5,1939.2 1165.5,1940.4 1166.0,1932.0 1462.8,1930.1 1462.8,1924.5 1463.5,1879.7 1440.5,891.5 1413.9,379.2 1633.0,258.7 1573.2,117.9 1224.0,73.2 881.8,45.8 833.0,131.6 654.0,90.8 335.5,214.8 280.9,145.4 88.9,114.7 351.1,453.0 254.9,451.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[643.0,898.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40715501496292,40.508166968362595]}},{"type":"Feature","properties":{"resourceCoords":[1448.0,898.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40608333193917,40.50938416562879]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0018","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1318.5,1894.7 1336.5,1894.4 1318.3,1832.4 1578.9,1834.0 1635.7,1832.7 1639.0,1356.0 1648.0,1356.0 1648.0,1347.0 1638.0,1346.0 1638.0,1326.0 1647.0,1325.0 1648.0,1213.0 1638.0,1212.0 1638.0,1184.0 1648.0,1183.0 1647.0,1148.0 1638.0,1147.0 1638.0,1121.0 1648.0,1120.0 1647.0,1115.0 1638.0,1114.0 1638.0,1085.0 1648.0,1084.0 1647.0,756.0 1638.0,755.0 1638.0,738.0 1646.0,737.0 1647.0,382.0 1646.0,341.0 1638.0,340.0 1638.0,281.8 1513.8,113.7 1431.3,74.8 1393.7,57.0 1381.6,104.0 911.8,1.0 734.4,1.0 697.7,30.6 370.1,70.7 224.2,174.0 221.9,169.0 5.0,295.7 45.1,809.7 94.0,1801.5 94.5,1846.6 95.2,1870.2 76.0,1870.2 76.4,1911.1 584.6,1904.9 813.9,1899.0 1135.8,1897.3 1318.5,1894.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1160.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40425255144334,40.51085540454935]}},{"type":"Feature","properties":{"resourceCoords":[63.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40716181228272,40.50998712269562]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p2","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"28"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0002","type":"ImageService3","width":1664,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.4,29.1 1295.2,29.9 1551.2,153.8 1629.3,471.6 1649.0,472.8 1649.0,495.4 1542.8,494.7 1541.0,955.0 1483.0,1501.4 1420.3,1758.2 1378.2,1931.0 1201.7,1931.6 700.5,1817.0 43.9,1652.8 84.8,1526.0 95.7,1457.7 100.4,953.9 103.1,491.6 100.3,260.9 103.8,14.4 157.4,29.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[785.0,489.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.406286,40.5187145]}},{"type":"Feature","properties":{"resourceCoords":[1541.0,955.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4042718,40.5191939]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p21 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"26"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021","type":"ImageService3","width":1665,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"138.2,1470.8 136.9,1645.6 135.1,1880.6 142.1,1896.7 1511.5,1905.3 1512.0,476.0 1647.2,470.6 1648.1,420.1 1648.8,378.7 1419.5,276.4 1419.4,286.7 1098.0,173.8 1098.0,172.5 770.4,56.0 327.0,32.6 323.6,1.0 151.6,1.0 151.4,36.9 146.8,961.9 142.1,962.0 138.2,1470.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,946.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.388686,40.5207597]}},{"type":"Feature","properties":{"resourceCoords":[1512.0,476.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3886939,40.5222465]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p21 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.26"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4392.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1294.4"},{"label":"split_canvas_h","value":"1146.8"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021","type":"ImageService3","width":1665,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1400.6,113.2 1391.0,27.8 1274.1,18.0 1232.8,18.0 1225.8,15.0 1225.8,13.9 1210.9,12.7 1210.8,114.2 1400.6,113.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0021__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1210.8,154.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3913708,40.5206741]}},{"type":"Feature","properties":{"resourceCoords":[1210.8,-8.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3916579,40.5208252]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p22","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0022","type":"ImageService3","width":1665,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.6,293.1 178.9,153.9 400.1,83.0 799.9,141.2 950.8,46.6 1279.7,27.7 1560.3,95.8 1585.7,1508.4 1530.6,1690.2 1580.1,1854.0 1494.5,1912.8 159.6,1905.6 158.7,492.4 292.4,487.0 293.9,396.1 62.6,293.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3868894,40.5228058]}},{"type":"Feature","properties":{"resourceCoords":[839.0,1860.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3850744,40.5218585]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p23","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0023","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"63.0,92.0 451.1,31.1 577.8,31.9 1487.5,37.6 1488.2,72.1 1504.0,827.0 1501.3,1375.2 1495.1,1883.6 928.6,1867.5 100.9,1857.4 63.0,92.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1048.0,1352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3922282,40.5181953]}},{"type":"Feature","properties":{"resourceCoords":[1504.0,827.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3906098,40.5185177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0024","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"133.3,30.2 151.2,795.8 149.8,1351.8 144.7,1867.5 375.4,1876.4 829.1,1889.4 1051.1,1891.0 1565.2,1911.2 1569.1,1843.5 1551.8,140.3 1421.3,30.9 1295.7,17.9 1268.0,18.0 1267.8,15.1 1131.3,1.0 132.6,1.0 133.3,30.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0024/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.38983483758723,40.51985596247006]}},{"type":"Feature","properties":{"resourceCoords":[1660.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.38661161038571,40.51814957687272]}},{"type":"Feature","properties":{"resourceCoords":[1660.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.38922856428516,40.51525236986934]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.39245179148668,40.516958755466675]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p25","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0025","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"103.8,1930.5 586.6,1912.7 586.5,1882.3 677.0,1873.5 997.2,1871.6 997.8,1879.4 1490.0,1875.0 1489.8,1868.9 1493.0,1348.0 1494.0,663.3 1498.8,149.7 925.4,141.2 87.8,142.5 89.8,200.0 47.9,227.5 83.4,620.9 125.8,621.9 1.0,1363.8 1.0,1948.0 53.3,1948.0 103.8,1930.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[585.0,1348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3954777,40.5161099]}},{"type":"Feature","properties":{"resourceCoords":[1493.0,1348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3937119,40.5151656]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p26","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"28"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0026","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"160.3,1281.1 147.1,588.7 141.2,69.3 373.6,72.4 830.5,74.0 1054.0,70.0 1571.9,77.3 1543.8,1245.5 1536.8,1245.6 1540.2,1391.3 1570.3,1862.1 1324.8,1834.4 859.7,1790.0 167.9,1807.9 160.3,1281.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[611.0,1271.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3928439,40.5147032]}},{"type":"Feature","properties":{"resourceCoords":[1054.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.390333,40.5159644]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p27","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0027","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1471.0,17.5 979.0,16.0 978.5,8.2 976.4,8.2 975.0,15.0 693.0,14.0 687.0,9.0 687.0,6.4 658.5,6.2 658.0,14.0 641.0,14.0 640.5,7.8 638.9,7.9 638.0,14.0 568.0,14.0 567.7,44.3 84.9,56.3 1.0,84.3 1.0,1943.0 36.9,1939.0 96.8,1931.8 569.3,1919.9 1025.4,1922.9 1487.2,1919.3 1486.0,1242.0 1481.6,676.9 1471.0,17.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[568.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3978575,40.5134866]}},{"type":"Feature","properties":{"resourceCoords":[1486.0,1242.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3960564,40.5125478]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0028","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"826.5,24.4 1285.8,87.0 1528.1,124.2 1568.1,1834.8 1635.0,1910.3 1635.0,1924.0 1188.0,1927.0 1187.1,1936.2 1060.9,1932.9 1016.0,1932.8 1016.0,1930.0 999.0,1929.0 998.5,1932.7 953.3,1932.5 953.0,1931.0 932.0,1931.0 931.8,1932.5 922.1,1932.5 922.0,1932.0 906.0,1932.0 905.9,1932.4 842.6,1932.2 840.0,1930.0 823.0,1930.0 821.7,1932.2 819.4,1932.2 819.0,1930.0 771.0,1930.0 770.8,1932.0 736.0,1931.9 735.0,1930.0 685.0,1930.0 684.8,1931.8 500.3,1931.2 500.0,1930.0 461.0,1931.1 382.0,1930.8 382.0,1930.0 364.0,1930.0 363.8,1930.8 361.1,1930.8 361.0,1930.0 262.0,1930.0 262.0,1930.5 141.4,1930.1 145.5,1250.1 145.4,682.8 139.9,14.5 826.5,24.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,1251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.39514905381488,40.512080613303795]}},{"type":"Feature","properties":{"resourceCoords":[1525.0,1251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.39334765896226,40.511157078013476]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p29","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0029","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1472.0,64.4 1012.0,66.0 557.6,61.1 86.9,71.0 27.2,77.9 1.0,80.8 1.0,1580.8 23.9,1603.8 24.2,1688.2 17.6,1948.0 42.4,1941.2 43.0,1931.0 79.9,1931.0 80.9,1708.0 544.8,1786.4 545.0,1779.9 1006.2,1839.2 1006.1,1863.5 1463.1,1916.2 1465.6,1460.5 1462.6,757.0 1472.0,64.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[553.0,1433.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4006172,40.5104186]}},{"type":"Feature","properties":{"resourceCoords":[1012.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3978759,40.5120032]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p3","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0003","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"271.6,1618.5 276.8,1422.2 283.6,1158.1 224.6,612.0 129.0,162.0 232.9,140.2 228.1,118.2 745.8,38.5 1020.5,132.2 1262.3,70.8 1312.2,139.7 1470.4,829.5 1481.5,922.8 1489.3,1819.3 962.5,1823.4 966.0,1732.3 271.1,1693.2 271.1,1639.9 271.3,1631.0 262.2,1630.8 261.9,1620.6 271.6,1618.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1485.0,1332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4008469,40.5195171]}},{"type":"Feature","properties":{"resourceCoords":[129.0,162.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4050951,40.5197416]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p30","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0030","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1638.9,41.2 1639.0,68.8 1510.9,66.8 1511.1,755.2 1513.0,1434.0 1512.7,1461.0 1508.8,1829.7 1278.5,1831.9 1278.5,1838.1 1044.8,1821.1 1044.9,1817.0 124.6,1841.7 126.0,1457.3 121.8,752.7 129.9,59.1 1043.6,57.0 1169.1,59.6 1169.9,50.5 1614.0,45.2 1622.3,40.8 1638.9,41.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[589.0,1434.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3979081,40.5090081]}},{"type":"Feature","properties":{"resourceCoords":[1513.0,1434.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3960879,40.5080643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0031","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.6,1710.2 74.2,1710.5 77.9,1206.3 76.5,978.7 81.0,659.4 83.2,238.3 544.6,316.4 544.8,310.0 1003.6,369.1 1003.5,393.3 1458.2,445.9 1456.1,817.2 1458.7,1014.5 1448.8,1905.4 999.0,1835.9 557.8,1772.7 286.1,1726.5 33.4,1722.5 33.6,1710.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[539.0,1306.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40245307297569,40.50840775009434]}},{"type":"Feature","properties":{"resourceCoords":[88.0,1702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40388267253786,40.50827212594631]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0032","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1581.5,1890.9 1073.7,1824.0 393.5,1710.9 344.7,1703.2 321.4,1703.4 305.1,1703.5 258.4,1693.6 250.3,1703.8 157.6,1704.2 157.4,1683.1 157.3,1672.3 162.4,772.9 158.7,573.7 158.8,126.5 1081.7,98.7 1081.6,102.8 1316.0,119.0 1316.0,112.8 1546.9,109.8 1544.6,432.3 1547.2,834.6 1557.0,837.2 1560.0,920.5 1645.1,944.6 1645.3,1014.8 1552.0,987.5 1547.2,1178.6 1579.9,1178.4 1581.5,1890.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[618.0,1288.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40003431763671,40.506671221116505]}},{"type":"Feature","properties":{"resourceCoords":[1496.0,415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.39713839648144,40.50707330852587]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0033","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.8,1773.6 319.5,1801.8 548.5,1834.5 778.5,1861.2 1012.4,1894.3 1239.2,1920.2 1433.1,1946.3 1434.0,1928.0 1460.8,1928.5 1458.2,1382.8 1452.7,1117.8 1451.8,784.9 1445.7,182.6 1000.0,117.2 562.7,57.9 298.2,15.0 296.0,15.0 296.0,14.7 293.3,14.2 293.0,16.0 252.0,16.0 251.7,13.9 247.5,13.9 246.0,16.0 43.1,12.2 33.0,12.0 30.9,3.4 27.6,1.0 26.2,1.0 31.8,274.3 32.4,318.8 32.6,338.5 36.0,361.1 36.2,380.9 33.3,382.9 33.5,402.6 36.5,539.8 36.7,557.5 22.2,1797.9 93.2,1815.0 92.8,1773.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[550.0,1262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40472807260161,40.50587001180098]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40224814802332,40.50566200191245]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0034","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"156.7,20.8 169.0,21.0 171.0,20.8 248.0,21.0 248.8,5.0 256.0,11.0 300.6,13.8 302.0,21.0 318.0,21.0 324.9,17.9 341.0,21.0 342.6,21.0 389.1,28.9 1058.3,144.4 1558.2,213.4 1556.4,690.8 1589.8,792.5 1631.1,797.1 1631.0,815.0 1641.6,817.6 1633.2,828.8 1517.2,810.4 1517.4,847.8 1291.0,1064.3 1295.5,1512.5 1106.7,1892.8 1066.4,1887.0 614.7,1829.0 387.1,1794.8 157.3,1764.9 159.2,1195.0 155.9,928.9 157.8,594.5 156.7,20.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[606.0,1262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4022800471289,40.50417419687004]}},{"type":"Feature","properties":{"resourceCoords":[606.0,1815.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40302890759362,40.50333413485654]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0035","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"79.3,1784.3 10.9,1834.2 13.8,1479.2 28.8,1459.3 13.9,1412.4 17.4,1214.0 13.8,1026.5 13.8,1007.5 16.8,1004.5 16.9,987.6 23.8,931.3 22.2,822.8 25.3,552.9 26.9,394.6 32.7,377.6 37.9,42.7 109.7,60.4 109.6,18.4 339.1,47.9 571.0,81.9 804.0,109.8 1040.9,144.2 1270.6,171.4 1495.2,202.5 1492.1,634.0 1490.9,1238.7 1495.6,1918.8 1458.6,1915.2 563.7,1914.0 563.1,1864.7 124.0,1787.8 123.7,1741.5 79.7,1741.2 79.3,1784.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[580.0,1325.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4071812796188,40.50312722689255]}},{"type":"Feature","properties":{"resourceCoords":[1490.0,627.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40444127331833,40.50324030280172]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p36","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"28"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0036","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"154.9,1189.8 160.0,585.0 165.9,153.3 397.8,184.0 627.4,219.1 1083.1,278.5 1318.0,312.9 1314.8,593.9 1543.3,595.7 1541.4,771.7 1578.8,771.6 1560.8,1885.2 1533.7,1895.8 278.9,1919.0 155.0,1878.4 155.1,1870.2 154.9,1189.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,1196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40344,40.5013707]}},{"type":"Feature","properties":{"resourceCoords":[160.0,585.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4044467,40.5032276]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0037","type":"ImageService3","width":1655,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,528.9 1.0,531.2 16.3,567.1 65.0,950.4 40.6,1897.6 84.2,1922.7 1595.6,1901.7 1603.1,683.7 1573.7,661.1 1593.1,542.9 1555.0,542.7 1335.7,309.0 879.2,308.2 492.9,111.0 463.6,307.3 180.1,301.3 177.6,532.5 1.0,528.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0037/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.40299600017187,40.50207037518946]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.40083296325041,40.504558492009195]}},{"type":"Feature","properties":{"resourceCoords":[1655.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.39700647395019,40.502607920491194]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.39916951087164,40.50011980367146]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p38 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"8"},{"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":"3805.2"},{"label":"split_canvas_w","value":"6632.0"},{"label":"split_canvas_h","value":"3990.8"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"157.8,985.6 146.0,1440.2 142.6,1898.5 143.1,1926.3 1431.9,1930.5 1521.8,1905.0 1542.0,1111.3 1514.5,1111.5 1516.6,984.1 832.5,984.0 157.8,985.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[146.0,1440.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3952023,40.5075794]}},{"type":"Feature","properties":{"resourceCoords":[1509.0,1440.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3933612,40.5096342]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p38 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.73"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6632.0"},{"label":"split_canvas_h","value":"3854.4"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038","type":"ImageService3","width":1658,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"330.1,34.7 327.6,44.1 247.7,46.5 224.0,128.0 156.7,127.9 183.4,38.5 1.0,32.8 1.0,64.2 56.9,64.3 129.3,923.6 558.6,944.0 693.2,887.3 840.7,951.7 1390.4,952.9 1390.0,927.6 1394.2,483.8 1406.6,43.6 1380.7,43.3 716.3,34.6 330.1,34.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0038__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1390.0,927.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3942979,40.5071034]}},{"type":"Feature","properties":{"resourceCoords":[67.0,478.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3970581,40.5055158]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.56"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0039","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"34.3,1093.0 32.6,195.0 77.0,91.8 712.7,49.8 1248.6,95.9 1384.0,48.9 1538.9,149.7 1560.9,182.2 1562.8,1835.3 1476.5,1815.0 1362.2,1895.3 1147.7,1884.2 1058.3,1821.1 772.9,1913.8 346.2,1907.9 338.7,1939.0 314.0,1939.0 307.0,1939.0 290.5,1939.0 290.9,1915.8 114.2,1380.3 92.6,1380.1 34.3,1093.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1009.0,1627.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4105810918098,40.496356416930105]}},{"type":"Feature","properties":{"resourceCoords":[1532.0,702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.41168124412506,40.498116480199386]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p40 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.50"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6608.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"93.1,331.1 301.1,515.8 611.4,622.9 623.0,622.8 623.0,626.9 649.9,636.1 738.3,1213.6 728.9,1629.2 887.5,1784.4 963.2,1785.6 958.9,1844.5 1208.9,1840.8 1290.9,1902.6 1475.7,1769.4 1464.1,1545.5 1524.0,1511.6 1449.7,979.8 1159.1,966.1 1000.4,746.0 954.3,175.2 790.2,138.4 733.2,140.1 732.8,125.5 573.3,89.8 573.8,139.3 549.8,139.2 1.0,328.9 1.0,351.1 93.1,331.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.41185897778796,40.4957517035099]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.40872728355353,40.49402370493698]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.4113892508251,40.49119411427941]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.41452094505952,40.492922112852334]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p40 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4411.6"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2196.4"},{"label":"split_canvas_h","value":"3434.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1184.5,596.2 1168.3,659.7 1162.2,659.7 1142.2,716.5 1218.9,782.2 1519.5,773.2 1588.3,716.3 1596.3,155.8 1328.0,133.2 1198.2,1.0 1160.8,1.0 1162.9,205.2 1167.8,596.5 1184.5,596.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0040__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1102.9,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.3931644177628,40.52590754523495]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.3924194086199,40.526728230578925]}},{"type":"Feature","properties":{"resourceCoords":[1652.0,858.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.39074493486295,40.52583755225445]}},{"type":"Feature","properties":{"resourceCoords":[1102.9,858.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-78.39148994400585,40.52501686691048]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0004__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p4 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0004__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0004","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.8,178.2 203.4,875.4 212.9,969.5 204.3,1872.2 629.6,1883.5 1077.3,1881.4 1469.2,1883.1 1476.3,1928.7 1497.0,1928.6 1625.9,1897.4 1581.3,1511.5 1519.3,1444.3 1578.0,1442.3 1605.0,1358.6 1587.5,450.5 860.0,541.8 840.5,525.1 838.3,525.5 838.3,523.2 734.1,434.4 784.2,321.1 246.4,45.8 110.7,73.5 56.8,178.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0004__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,1376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40085866456347,40.51952279877979]}},{"type":"Feature","properties":{"resourceCoords":[1422.0,1875.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.39786991568087,40.52015398295095]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p5 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.66"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3122.0"},{"label":"split_canvas_w","value":"1987.2"},{"label":"split_canvas_h","value":"4674.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2.9,780.5 1.0,1148.6 1.0,1890.5 23.9,1877.3 55.6,1898.8 150.3,1921.3 476.6,1888.6 473.7,954.3 495.8,954.2 495.8,904.0 48.2,827.8 47.6,780.5 34.2,780.5 2.9,780.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[50.0,1648.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4097991,40.5016934]}},{"type":"Feature","properties":{"resourceCoords":[50.0,960.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4088807,40.502704]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p5 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"22"},{"label":"confidence","value":"0.91"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1584.7,248.0 1513.4,34.4 1413.6,22.4 149.2,44.4 169.5,514.5 101.1,599.2 320.7,755.3 421.7,729.9 494.9,780.5 496.8,780.5 496.8,781.8 546.2,815.9 563.6,1827.3 646.5,1906.1 1419.8,1900.8 1442.0,1932.3 1510.2,1931.8 1525.4,1931.8 1504.0,250.0 1584.7,248.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0005__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[821.0,953.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3968014,40.5234145]}},{"type":"Feature","properties":{"resourceCoords":[1507.0,482.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3967781,40.5249162]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p6","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"27"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0006","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.0,30.5 1533.2,55.1 1548.8,1190.4 1571.9,1214.3 1535.0,1214.0 1534.2,1421.2 1533.5,1816.2 1533.2,1880.0 1526.9,1880.0 1509.3,1927.8 1471.2,1907.0 193.7,1901.0 67.6,1715.2 151.6,1716.0 159.2,22.6 240.3,21.9 243.0,30.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,951.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3945208,40.5252266]}},{"type":"Feature","properties":{"resourceCoords":[155.0,951.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3954266,40.5242122]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p7","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"23"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0007","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1518.4,240.7 1513.0,476.0 1508.9,1165.2 1510.5,1605.4 1527.1,1826.4 1531.1,1937.5 1505.0,1937.2 1459.8,1936.8 1378.0,1878.2 492.3,1896.7 122.5,1797.4 143.6,1344.2 84.8,1118.3 142.2,1012.4 142.5,562.6 93.3,105.0 255.8,19.1 1204.9,17.8 1205.0,18.0 1461.8,18.0 1546.2,51.3 1572.5,241.6 1518.4,240.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[831.0,476.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4107646,40.5128595]}},{"type":"Feature","properties":{"resourceCoords":[1513.0,476.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4094471,40.5135761]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p8","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"21"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0008","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.6,1716.8 230.1,1606.2 224.6,1385.7 245.0,948.0 283.4,263.1 300.5,29.5 354.2,33.1 354.5,36.5 1080.2,43.1 1276.2,236.1 1319.0,312.1 1320.7,543.8 1369.8,1013.3 1413.3,1475.5 1319.5,1469.4 1200.1,1872.9 1174.6,1871.0 1064.2,1853.5 1023.1,1847.1 1024.7,1895.4 541.1,1928.4 530.8,1931.4 423.0,1933.0 417.0,1948.0 396.4,1948.0 417.1,1918.4 157.8,1712.5 228.6,1716.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,948.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4085024,40.5125596]}},{"type":"Feature","properties":{"resourceCoords":[1445.0,1891.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.4048601,40.5125736]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Altoona, Pennsylvania | 1894 | sanborn07496_002 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T21:53:17Z","modified":"2026-10-18T21:53:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0009","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"381.2,286.5 1545.0,15.7 1542.3,52.0 1538.3,281.8 1551.1,509.8 1536.6,510.0 1529.8,747.5 1536.7,747.5 1556.3,954.9 1525.1,954.3 1537.5,1433.4 1524.7,1433.5 1534.9,1856.4 1509.2,1856.4 1494.8,1931.7 1194.0,1931.0 1191.0,1948.0 1082.0,1948.0 1081.0,1935.0 1063.0,1935.0 1062.0,1948.0 1021.0,1948.0 1020.0,1932.0 995.0,1932.0 987.0,1937.0 986.0,1932.0 915.0,1932.0 897.0,1936.0 896.0,1932.0 871.0,1932.0 870.0,1948.0 852.0,1948.0 852.0,1936.0 846.0,1932.0 828.0,1932.0 825.0,1936.0 824.0,1932.0 777.0,1932.0 774.0,1948.0 773.0,1932.0 653.0,1932.0 652.0,1948.0 606.0,1948.0 605.0,1939.0 568.0,1939.0 567.0,1932.0 438.0,1932.0 427.0,1935.0 427.0,1948.0 391.0,1948.0 390.0,1932.0 353.7,1932.3 224.3,1844.3 244.9,1846.4 270.4,1847.0 367.9,1438.8 461.7,1439.8 393.9,981.9 320.1,516.8 306.0,286.1 381.2,286.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074961894:07496_1894-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[782.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40557365545385,40.51417439620301]}},{"type":"Feature","properties":{"resourceCoords":[313.0,497.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.40713302177011,40.51436959486657]}}]}}]}