{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn07494_008.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Allentown, Pennsylvania | 1958 | 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":"84"},{"label":"placed","value":"62"},{"label":"unplaced","value":"22"},{"label":"fit sources","value":"georef 45, georef-snap 17"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"16 sheet(s) cut into 39 panels"},{"label":"unplaced pages","value":"p212__1 (tier 1, 40.58636,-75.49719 +/-255m); p215__2 (tier 1, 40.59365,-75.51853 +/-218m); p216__1 (tier 1, 40.51838,-75.60009 +/-389m); p216__2 (tier 4, 40.60392,-75.46539 +/-4965m); p216__3 (tier 4, 40.60392,-75.46539 +/-4965m); p216__4 (tier 4, 40.60392,-75.46539 +/-4965m); p216__5 (tier 4, 40.60392,-75.46539 +/-4965m); p216__6 (tier 4, 40.60392,-75.46539 +/-4965m); p216__7 (tier 4, 40.60392,-75.46539 +/-4965m); p217__1 (tier 1, 40.59777,-75.47385 +/-372m); p217__2 (tier 1, 40.59430,-75.47572 +/-389m); p219__2 (tier 1, 40.59464,-75.46915 +/-173m); p222__1 (tier 1, 40.58327,-75.45895 +/-206m); p223 (tier 2, 40.59442,-75.46227 +/-247m); p227__1 (tier 1, 40.58361,-75.45914 +/-159m); p234 (tier 2, 40.61688,-75.43304 +/-371m); p237__1 (tier 1, 40.61426,-75.45608 +/-283m); p237__2 (tier 1, 40.60962,-75.45140 +/-440m); p243 (tier 1, 40.62309,-75.44156 +/-540m); p246__2 (tier 1, 40.62748,-75.41692 +/-150m); p254__2 (tier 1, 40.60506,-75.44616 +/-391m); p261 (tier 2, 40.61595,-75.44237 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0201/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p201","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0201/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0201","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"42.1,366.4 37.4,646.5 56.5,759.3 42.0,1030.7 36.0,1045.2 48.9,1045.2 48.1,1106.5 125.2,1200.1 124.8,1250.0 204.0,1248.4 278.7,1249.0 430.9,1248.0 1044.4,1245.4 1042.8,1165.5 1042.5,1090.9 1043.3,1019.1 1042.8,937.6 1043.1,706.0 1042.5,632.1 1042.0,323.6 1042.7,19.2 930.6,19.8 930.6,14.2 270.6,24.4 120.2,42.5 57.2,329.6 1.0,329.8 1.0,350.5 42.1,366.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0201/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[740.0,634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50668640494746,40.60708681192983]}},{"type":"Feature","properties":{"resourceCoords":[740.0,935.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50594535190022,40.605515871196666]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0202/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p202","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.65"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0202/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0202","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1038.8,810.9 920.2,811.9 616.3,812.6 469.3,813.0 391.2,813.4 391.8,964.6 390.8,1200.0 390.0,1268.3 89.0,1269.0 87.7,1189.8 87.5,1115.8 88.4,1044.7 88.1,964.0 88.8,734.5 88.3,661.3 88.5,355.6 89.8,54.0 391.9,52.6 617.3,52.6 1035.0,51.0 1033.0,53.0 1056.2,74.2 1065.2,582.3 1056.6,1161.0 1038.0,1159.5 1038.8,810.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0202/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[89.0,1269.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5030887,40.6044646]}},{"type":"Feature","properties":{"resourceCoords":[89.0,205.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.505747,40.610065]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0203/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p203","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0203/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0203","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"115.2,1133.1 117.0,1133.0 111.4,355.9 119.9,355.9 145.3,88.9 262.7,87.5 1026.2,78.3 1030.2,612.8 1045.5,612.6 1064.5,664.5 1052.1,699.7 1068.8,873.2 1055.5,1043.9 1031.0,1040.5 941.7,1192.3 850.9,1186.4 834.5,1203.9 747.0,1181.0 631.0,1217.8 466.0,1180.7 458.1,1196.0 324.2,1136.2 182.4,1195.0 169.2,1217.0 115.2,1133.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0203/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[570.0,351.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.516926,40.596101]}},{"type":"Feature","properties":{"resourceCoords":[117.0,1133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.518162,40.591182]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0204/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p204","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0204/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0204","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"150.5,1.0 96.0,1.0 94.8,200.7 95.1,278.7 93.5,698.0 91.2,1224.2 106.2,1224.2 124.2,1275.6 129.7,1260.5 644.3,1269.0 790.0,1240.3 917.5,1269.9 964.5,1224.6 997.7,1224.8 996.3,984.4 996.4,839.1 997.2,698.0 999.6,454.8 997.7,368.4 997.4,202.2 998.1,153.0 922.5,60.5 923.5,1.0 910.5,1.0 895.7,36.7 150.8,16.0 150.5,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0204/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[546.0,698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5112885,40.5992317]}},{"type":"Feature","properties":{"resourceCoords":[395.0,698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5123404,40.5989415]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p205 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.4,138.0 108.2,304.8 110.9,391.4 110.8,635.4 111.2,777.0 112.5,922.7 116.1,1163.8 264.1,1162.1 529.2,1160.2 536.0,1131.1 737.1,1057.1 737.0,1052.9 735.1,925.9 735.1,923.5 767.2,922.7 909.2,919.5 969.4,627.5 1017.5,627.0 1016.0,462.3 1014.5,383.3 1015.1,129.3 408.9,134.7 258.5,136.3 184.7,136.1 106.4,138.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[115.0,900.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50746478574396,40.59870697479456]}},{"type":"Feature","properties":{"resourceCoords":[784.0,134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50468785927778,40.60400836591436]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p205 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.31"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2940.4"},{"label":"split_canvas_y","value":"3662.0"},{"label":"split_canvas_w","value":"1411.6"},{"label":"split_canvas_h","value":"1738.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"942.7,1270.9 942.7,1251.2 998.7,1251.1 1060.9,970.9 1044.2,972.9 893.6,948.9 783.4,967.1 769.0,1090.8 790.9,1149.2 765.9,1246.3 816.4,1274.6 901.8,1254.9 942.7,1270.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0205__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1065.0,1251.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.511663,40.607527]}},{"type":"Feature","properties":{"resourceCoords":[765.1,1251.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.513771,40.606949]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p206 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.41"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2414.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2986.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"59.5,1202.0 108.5,1201.7 108.2,1232.1 261.4,1236.0 261.5,1259.2 414.1,1226.5 414.1,1200.2 566.9,1199.4 566.9,1223.4 719.4,1235.3 719.4,1233.2 872.4,1233.5 871.7,1197.8 1078.3,1197.0 1078.2,1144.0 1053.3,663.1 564.5,665.8 107.2,668.2 58.6,668.5 1.0,942.4 1.0,1124.8 59.5,1202.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1024.0,1197.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.494228,40.600783]}},{"type":"Feature","properties":{"resourceCoords":[260.0,667.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5007975,40.6021261]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p206 [2]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.78"},{"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":"4352.0"},{"label":"split_canvas_h","value":"2449.2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"895.1,131.3 836.1,123.2 812.2,229.1 655.8,194.0 662.0,170.2 622.6,150.2 642.3,76.7 528.8,94.2 431.6,68.2 409.6,78.3 423.0,91.2 392.2,173.5 315.0,191.6 246.4,249.4 152.7,256.0 84.0,230.3 25.4,289.3 34.2,516.9 30.6,534.1 227.3,536.0 534.8,540.5 646.5,538.9 687.7,531.1 687.6,542.3 994.9,545.2 995.6,481.6 998.2,270.8 979.2,270.6 926.4,154.1 894.8,152.9 895.1,131.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0206__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[381.0,538.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.508358,40.590527]}},{"type":"Feature","properties":{"resourceCoords":[844.0,269.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50589,40.592815]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0207/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p207","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"21"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0207/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0207","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"414.6,1287.6 883.4,1288.5 1019.4,1289.7 1018.0,983.8 1013.5,52.1 879.7,46.6 798.4,17.5 799.6,1.0 105.6,1.0 108.2,236.1 110.9,841.1 111.1,872.0 112.5,1133.8 113.5,1289.5 225.0,1288.8 414.6,1287.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0207/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[253.0,236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.498287,40.608064]}},{"type":"Feature","properties":{"resourceCoords":[411.0,236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.49809,40.607646]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0208/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p208","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"37"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0208/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0208","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"237.1,91.8 540.2,94.5 650.4,92.2 691.0,84.3 691.0,95.4 993.9,96.6 988.2,952.4 986.0,1220.0 1063.8,1240.9 1058.1,1263.8 791.3,1230.5 661.1,1277.6 523.0,1283.2 81.6,1241.5 40.8,1031.5 47.4,741.5 25.7,605.2 28.5,164.9 43.2,91.1 237.1,91.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0208/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[387.0,522.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.507277,40.588269]}},{"type":"Feature","properties":{"resourceCoords":[838.0,875.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5032554,40.5872851]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0209/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p209","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"22"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0209/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0209","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,781.5 1.0,802.6 31.2,803.4 85.0,917.5 103.8,917.4 104.2,1125.3 104.3,1183.9 864.4,1169.2 864.5,1173.7 1043.1,1172.5 1010.2,1096.8 1013.6,1097.3 1009.6,912.2 1013.3,912.1 1013.2,882.2 1056.8,643.6 1040.2,643.9 1020.5,379.1 1010.5,379.1 1011.4,192.5 1012.0,115.0 963.4,115.2 904.3,37.3 904.4,1.0 766.3,1.0 526.0,88.2 519.1,117.4 253.4,118.2 105.0,119.2 71.6,119.2 24.6,165.0 52.5,171.3 41.5,359.4 59.9,422.3 58.0,577.8 41.3,717.7 17.7,783.5 1.0,781.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0209/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[408.0,916.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.502727,40.593686]}},{"type":"Feature","properties":{"resourceCoords":[1012.0,115.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5005241,40.5990461]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0210/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p210","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0210/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0210","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.5,890.7 136.7,652.0 120.1,652.1 101.0,387.1 90.9,387.1 92.2,212.4 92.2,200.2 92.7,152.9 245.0,157.1 244.9,180.1 396.6,148.0 396.7,121.8 548.6,121.4 548.5,145.3 700.0,157.4 700.0,155.4 852.1,156.0 851.5,120.6 1056.8,120.2 1056.7,1190.0 700.2,1189.2 663.8,1188.6 604.8,1179.2 121.8,1181.3 89.0,1105.6 92.4,1106.0 88.9,920.8 92.5,920.6 92.5,890.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0210/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[396.0,386.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.497768,40.598235]}},{"type":"Feature","properties":{"resourceCoords":[396.0,652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4971041,40.5968359]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0211/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p211","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0211/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0211","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"89.7,106.7 852.4,94.5 852.5,99.0 971.3,98.6 992.2,320.1 977.9,320.1 1044.5,789.2 1062.6,789.1 1022.5,949.8 1053.7,1105.1 1033.1,1254.5 769.4,1244.1 656.2,1272.6 378.9,1285.5 189.6,1268.4 178.5,1285.0 160.6,1282.8 166.2,1259.8 87.9,1239.3 88.7,970.5 89.7,110.9 89.7,106.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0211/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[697.0,539.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.498894,40.590586]}},{"type":"Feature","properties":{"resourceCoords":[697.0,110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4999656,40.5928363]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0212__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p212 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0212__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0212","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"135.1,779.1 146.7,732.1 411.2,755.2 447.4,776.0 513.3,743.1 565.7,762.0 569.1,775.8 570.5,775.8 570.6,782.0 606.2,928.3 608.5,1186.5 643.9,1245.5 692.2,1211.4 769.2,1226.2 1029.6,1160.4 1004.4,1030.4 1043.9,620.1 1005.8,253.9 1041.1,184.3 1041.1,96.0 683.4,95.3 646.8,94.7 587.6,85.3 42.5,88.0 63.8,309.6 49.5,309.7 117.0,779.2 125.7,779.1 135.1,779.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0212__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[987.0,525.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4904923,40.5929067]}},{"type":"Feature","properties":{"resourceCoords":[987.0,96.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.491558,40.595156]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0213/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p213","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"30"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0213/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0213","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1068.8,518.2 1062.5,102.1 1023.6,33.6 389.2,16.4 42.6,42.0 17.5,130.4 34.4,306.5 19.9,1016.5 36.6,1151.3 16.8,1198.0 1.0,1196.5 1.0,1212.5 98.0,1213.2 249.7,1214.4 1006.1,1220.0 1010.9,798.2 1011.2,719.7 1014.0,517.8 1068.8,518.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0213/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[556.0,717.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5188403,40.6001216]}},{"type":"Feature","properties":{"resourceCoords":[856.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5161091,40.5993592]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0214/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p214","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0214/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0214","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1204.7 1.0,1210.3 111.1,1209.8 413.4,1207.8 638.8,1207.4 1056.6,1205.0 1075.0,1186.1 1087.0,1088.7 1087.0,1085.1 1070.2,549.0 1028.3,444.2 1053.4,345.6 1056.3,180.2 1016.2,63.3 914.7,32.0 385.4,29.4 357.5,19.4 233.7,120.4 212.5,96.9 1.0,333.8 1.0,351.6 27.1,357.1 32.5,592.2 47.3,615.4 15.8,932.1 18.1,1204.5 1.0,1204.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0214/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[323.0,600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.506165,40.614471]}},{"type":"Feature","properties":{"resourceCoords":[110.0,904.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5068867,40.6124686]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0215__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p215 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0215__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0215","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"891.5,36.9 746.5,23.1 641.8,36.7 604.5,130.3 614.6,152.4 577.4,267.1 589.3,284.6 563.5,319.4 563.4,324.1 557.3,327.9 531.5,362.8 300.1,492.0 77.7,490.8 22.9,667.1 16.8,1016.1 26.7,1137.7 95.5,1220.9 111.7,1226.9 125.9,1195.5 469.8,1265.2 618.5,1260.0 727.7,1227.1 835.1,1269.5 882.7,1219.0 957.3,1244.0 1012.5,1222.5 1030.7,1193.4 977.8,1107.8 979.6,1107.7 988.3,323.2 996.9,323.2 1027.5,54.2 991.3,54.0 891.5,53.3 891.5,36.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0215__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[831.0,859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.51979347927005,40.592178455613855]}},{"type":"Feature","properties":{"resourceCoords":[526.0,859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.52186056990622,40.59159687044537]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0218/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p218","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0218/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0218","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"595.8,1167.1 531.0,1148.6 355.4,1120.9 208.2,1095.0 55.6,1068.8 24.2,1062.8 35.6,253.2 38.4,134.9 100.3,111.9 264.8,143.1 353.8,58.5 481.2,37.0 979.7,57.4 1061.3,155.3 1064.5,321.5 1037.5,376.4 1011.3,464.6 1003.1,555.3 1006.1,596.0 1025.0,741.9 1034.2,829.3 1041.8,939.0 1039.2,964.3 1036.8,989.5 1010.6,1024.3 798.2,1306.7 595.8,1167.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0218/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.46932598078007,40.593954769119655]}},{"type":"Feature","properties":{"resourceCoords":[497.0,1150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.46820594425861,40.594083001101396]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0219__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p219 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.67"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0219__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0219","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"794.2,916.2 795.6,922.1 801.7,947.4 915.4,889.2 917.9,884.7 970.0,884.4 989.6,812.5 991.1,807.0 1045.9,606.5 1049.5,346.9 1025.4,171.7 994.0,115.3 936.9,113.1 836.5,151.1 541.1,141.3 437.8,164.6 99.5,113.7 82.8,73.4 64.0,71.1 34.9,191.9 22.1,982.0 1.0,986.1 1.0,1044.8 8.6,1038.4 189.7,1178.8 216.0,1167.0 216.0,1168.4 794.2,916.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0219__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[374.0,601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4784685,40.5902874]}},{"type":"Feature","properties":{"resourceCoords":[216.0,1167.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4791287,40.5869864]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0220/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p220","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.54"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0220/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0220","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"132.4,82.3 142.7,76.9 294.9,258.3 324.1,252.1 323.7,253.5 962.8,125.2 962.9,131.5 965.8,260.2 967.5,334.9 998.8,360.6 1010.7,907.4 1078.2,1053.4 1054.0,1123.0 1053.6,1213.8 929.1,1183.4 755.0,1206.0 637.0,1261.1 494.3,1260.8 304.6,1223.4 57.5,1254.3 32.2,1222.2 21.1,1000.1 67.5,291.6 29.4,177.1 26.7,80.1 38.1,39.9 73.2,20.9 145.4,22.4 132.4,82.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0220/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1000.0,813.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.47317190162869,40.58529412769674]}},{"type":"Feature","properties":{"resourceCoords":[229.0,714.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4786802219178,40.584415789796225]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0221/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p221","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0221/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0221","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.5,383.6 183.2,353.0 186.8,349.1 238.6,361.3 275.3,294.6 278.1,289.5 380.5,103.5 379.1,108.9 629.0,160.9 837.5,168.5 837.4,180.6 902.5,180.9 957.2,279.6 999.6,280.1 999.1,372.4 998.0,741.4 997.1,755.9 1036.4,844.6 1014.0,890.0 1046.4,907.3 1023.5,968.6 1030.6,1025.7 1055.6,1035.0 1029.5,1118.5 1055.7,1138.6 1028.5,1169.9 935.6,1168.8 907.0,1196.9 870.6,1183.3 835.2,1229.6 723.0,1211.0 704.6,1232.5 529.2,1244.6 292.7,1226.0 158.5,1245.7 149.2,1270.6 85.8,1124.8 86.7,584.1 56.3,558.1 56.4,484.2 56.5,383.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0221/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[452.0,742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4713441,40.5875316]}},{"type":"Feature","properties":{"resourceCoords":[86.0,1030.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4731162,40.5853175]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0222__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p222 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.45"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0222__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0222","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"94.0,439.0 94.0,809.0 93.2,823.5 131.4,909.0 134.5,909.0 153.5,870.2 244.9,896.3 529.5,898.0 562.6,990.6 566.4,1204.6 653.5,1221.3 745.6,1203.7 803.7,1225.2 1050.4,1002.8 950.7,742.7 937.9,714.9 931.5,692.5 912.8,643.9 921.4,643.3 920.1,630.1 640.3,610.6 640.3,622.1 520.3,622.4 461.4,477.1 461.5,438.2 94.0,439.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0222__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[94.0,439.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.468539,40.590524]}},{"type":"Feature","properties":{"resourceCoords":[94.0,809.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4675997,40.5885988]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0224/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p224","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0224/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0224","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.0,626.9 62.6,599.0 55.8,576.4 36.2,527.4 45.0,526.7 31.9,409.2 28.7,372.7 69.8,50.3 93.2,52.9 87.2,108.4 316.3,148.0 428.0,135.4 602.0,197.3 847.5,117.3 970.1,103.4 1001.6,85.8 1019.2,140.2 1021.2,320.1 1031.7,316.6 928.7,696.4 877.3,713.8 906.8,803.3 872.5,937.2 805.6,1199.8 606.7,1150.8 513.8,1072.1 511.4,1079.3 364.0,1027.8 265.5,992.2 227.6,981.8 222.9,995.4 76.0,626.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0224/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[870.0,719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45627953937456,40.59157737221237]}},{"type":"Feature","properties":{"resourceCoords":[372.0,1013.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45895339808327,40.58914633049075]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0225/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p225","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0225/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0225","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"491.1,1184.4 500.5,1179.6 506.9,1192.8 539.9,1260.3 616.7,1236.1 777.4,1231.7 1053.7,1159.8 1053.1,1140.5 1051.0,1067.2 1065.7,1066.8 973.8,919.8 993.6,918.6 1024.0,907.9 943.0,804.0 890.9,736.2 956.8,685.2 930.2,649.8 911.7,587.5 902.5,539.9 897.5,483.6 895.9,423.6 891.5,131.3 688.0,135.3 578.7,83.7 578.2,91.2 423.6,79.5 319.9,70.7 280.9,70.4 279.9,84.7 217.4,1.0 207.2,1.0 33.5,276.2 56.8,278.1 80.3,473.9 42.5,731.0 81.2,891.1 98.7,917.1 289.7,922.6 310.0,975.8 394.0,999.8 432.9,1034.8 494.4,1155.1 491.1,1184.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0225/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[414.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45890128283324,40.58772950124165]}},{"type":"Feature","properties":{"resourceCoords":[1311.0,1219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45188476586999,40.583184459725324]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0226/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p226","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.26"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0226/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0226","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"874.0,1295.9 931.6,1239.3 930.0,1274.2 1021.7,1194.8 1015.8,886.9 1010.0,744.5 1001.8,426.8 996.8,205.5 922.0,49.8 863.3,29.4 846.5,56.3 765.6,75.0 585.8,34.8 326.3,33.5 283.1,8.4 190.6,86.1 194.7,106.0 161.2,112.4 84.0,207.8 98.1,205.1 71.4,265.2 153.4,258.6 147.3,271.2 210.7,301.8 227.5,309.9 166.7,577.2 99.5,716.2 86.3,792.4 14.2,790.7 1.0,790.4 1.0,801.2 40.9,827.8 35.3,1032.1 67.9,1121.7 71.7,1204.4 153.9,1205.8 288.1,1248.1 375.6,1250.0 465.7,1278.6 853.0,1279.3 874.0,1295.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0226/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[303.0,658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4557124,40.5819692]}},{"type":"Feature","properties":{"resourceCoords":[1007.0,1565.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.458711,40.575782]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0227__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p227 [2]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.27"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0227__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0227","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"455.6,6.9 445.9,20.4 98.5,42.0 65.5,60.4 53.8,96.5 45.1,477.8 82.5,822.5 69.5,886.2 279.9,921.5 280.5,922.5 280.6,922.5 280.6,922.7 325.2,998.0 317.8,1087.5 369.3,1173.2 531.9,1232.9 703.9,1235.4 779.1,1263.3 1033.0,1246.2 1066.4,1190.7 1053.6,1108.8 1042.4,1117.5 1000.8,977.0 992.7,976.0 1008.4,762.6 1020.1,608.4 1036.4,385.3 1049.1,200.8 1043.5,122.3 893.7,135.6 569.6,157.4 481.2,64.8 518.1,64.8 455.6,6.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0227__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[446.0,496.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4558663,40.5748995]}},{"type":"Feature","properties":{"resourceCoords":[132.0,496.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45783,40.5740652]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0228/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p228","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"},{"label":"confidence","value":"0.30"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0228/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0228","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"417.0,202.6 642.4,175.5 793.9,83.8 808.9,21.9 831.5,33.2 938.2,29.8 1054.7,93.1 1054.7,996.9 1036.4,990.4 1026.7,1009.8 936.1,964.8 869.6,1076.9 849.4,1193.3 752.4,1204.3 651.3,1267.0 174.0,1263.6 166.2,1278.2 149.9,1199.4 139.4,1208.3 92.5,1074.0 84.6,1073.3 89.7,865.4 93.8,715.2 99.2,497.9 102.8,318.3 93.6,242.3 417.0,202.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0228/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[673.0,617.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.448381,40.577828]}},{"type":"Feature","properties":{"resourceCoords":[949.0,439.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.447143,40.579409]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0229/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p229","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0229/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0229","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.0,358.7 30.6,347.8 39.7,90.7 93.5,40.1 162.7,54.5 396.1,34.4 562.1,53.6 793.8,26.1 1008.2,47.9 1053.7,103.6 1073.1,176.2 1060.1,832.1 1063.0,832.1 1053.1,928.0 1037.7,927.6 1033.3,1209.3 779.6,1207.4 427.4,1203.2 181.6,1202.0 95.0,1202.0 96.3,1066.1 47.2,987.5 92.3,958.9 101.7,572.1 92.5,577.9 48.5,406.5 19.0,358.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0229/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[774.0,835.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.451052,40.592872]}},{"type":"Feature","properties":{"resourceCoords":[95.0,1202.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.455735,40.590456]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0230/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p230","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0230/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0230","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"74.8,78.5 160.8,78.4 404.9,79.4 754.8,83.4 1006.8,85.0 1007.1,271.2 1003.5,610.1 1002.4,766.6 998.1,920.4 1087.0,921.3 1087.0,942.8 1067.8,949.3 1060.0,1170.9 1021.4,1169.5 1009.4,1216.6 515.5,1246.6 513.7,1272.4 400.5,1222.6 384.0,1235.4 363.1,1207.5 240.4,1179.7 249.3,1191.5 182.1,1194.1 137.8,1120.1 157.4,1119.3 187.5,1109.3 109.9,1005.6 60.0,937.9 125.8,889.1 100.3,853.7 83.4,792.1 75.3,745.1 71.5,689.7 71.2,630.7 72.5,343.2 74.8,78.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0230/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[420.0,739.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45270921096395,40.58696483546129]}},{"type":"Feature","properties":{"resourceCoords":[420.0,591.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.45281880903822,40.58779061634189]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0231/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p231","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0231/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0231","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"145.8,130.3 161.0,130.6 170.2,36.0 957.5,32.3 952.8,227.3 957.8,227.3 957.5,411.5 955.3,596.4 955.1,856.0 956.0,932.6 954.1,1120.4 882.7,1229.5 797.3,1221.3 702.1,1241.5 681.7,1241.3 672.4,1247.7 551.9,1229.0 311.9,1229.9 227.7,1258.7 226.6,1237.6 138.4,1237.1 141.8,1084.5 142.2,929.2 144.2,592.8 143.1,408.0 145.8,130.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0231/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[414.0,594.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.446743,40.590044]}},{"type":"Feature","properties":{"resourceCoords":[683.0,1086.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.444401,40.587422]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0232/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p232","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"25"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0232/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0232","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1061.6,1201.7 942.5,1189.1 913.1,1225.0 600.8,1224.9 430.4,1251.2 366.9,1207.3 312.2,1200.3 273.5,1204.2 262.1,1224.8 185.8,1218.3 96.9,1246.8 90.5,1265.5 64.5,1229.7 135.0,1119.5 134.8,931.3 133.1,854.5 130.5,594.3 130.8,408.9 129.0,224.4 124.0,224.4 126.7,29.0 696.1,20.2 925.7,32.5 1003.6,74.1 919.9,231.4 937.7,237.6 936.5,308.8 942.3,307.5 944.3,768.6 944.3,782.2 1034.5,833.5 1069.6,833.3 1061.6,1201.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0232/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[403.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.440718,40.590466]}},{"type":"Feature","properties":{"resourceCoords":[948.0,1084.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.436377,40.587963]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p233 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.31"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3063.6"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2336.4"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.5,1142.0 212.8,1349.0 217.8,1349.0 218.3,1349.0 214.6,1321.8 924.5,1340.8 1029.3,1322.7 1061.8,1236.0 1071.1,1086.2 1060.7,974.6 1024.5,920.6 968.1,914.7 922.1,860.1 566.0,788.9 420.3,789.8 385.1,799.9 403.2,825.7 398.6,901.8 358.8,906.8 270.9,889.0 257.2,831.5 192.4,816.3 134.7,929.6 85.8,929.3 87.5,1125.6 92.5,1142.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[876.0,1132.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.424817,40.591746]}},{"type":"Feature","properties":{"resourceCoords":[229.0,1132.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4294732,40.591528]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p233 [2]","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"23"},{"label":"confidence","value":"0.57"},{"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":"4352.0"},{"label":"split_canvas_h","value":"3584.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"197.6,769.0 213.8,769.3 214.2,758.9 531.3,763.9 914.2,804.9 1008.6,868.0 1003.6,891.5 1058.6,895.0 1036.8,873.4 1069.3,862.4 1071.6,841.0 1059.7,709.8 945.5,491.0 941.4,474.8 948.4,284.1 995.9,286.5 1056.8,178.9 1037.2,173.4 1015.4,130.2 860.2,118.4 794.5,58.4 693.0,40.3 535.2,30.6 333.2,74.0 245.2,64.5 167.8,46.6 166.8,10.4 164.4,9.1 77.2,164.5 94.9,171.1 92.2,242.2 98.0,241.0 90.0,701.8 89.6,715.5 178.7,768.7 197.6,769.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0233__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[98.0,241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.436908,40.592322]}},{"type":"Feature","properties":{"resourceCoords":[520.0,472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.433609,40.59128]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0235/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p235","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.12"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0235/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0235","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"905.7,105.3 906.1,197.2 908.7,765.9 905.8,765.9 908.9,807.4 909.4,917.8 917.0,917.5 931.5,1116.0 927.5,1120.8 883.5,1090.0 709.8,1168.2 661.5,1143.4 569.5,1236.9 518.3,1254.8 316.1,1241.5 232.3,1203.8 213.5,1226.4 72.0,1130.6 54.7,993.4 76.7,791.4 56.5,726.6 49.0,507.1 83.7,346.7 152.4,239.8 170.5,154.2 241.0,87.4 485.6,52.8 636.8,104.8 884.4,117.0 888.0,105.7 905.7,105.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0235/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[676.0,613.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.449297,40.603538]}},{"type":"Feature","properties":{"resourceCoords":[908.0,613.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4479126,40.6042723]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0236/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p236","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.17"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0236/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0236","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.0,746.4 56.2,188.9 115.7,188.9 180.2,190.7 246.3,190.9 250.8,189.1 320.1,190.4 501.7,190.6 501.9,100.3 701.0,101.0 881.0,100.0 995.7,97.1 1073.6,329.2 1052.5,353.9 1053.2,921.1 1011.0,946.8 890.9,945.6 835.6,1017.9 868.4,1082.9 948.5,1143.7 759.7,1131.3 660.2,1162.8 434.4,1144.4 129.2,941.6 72.0,1012.6 80.3,1074.7 67.0,1089.9 55.8,895.2 48.4,895.2 49.5,787.1 49.5,787.0 47.2,746.4 50.0,746.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0236/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[881.0,100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.445079,40.609278]}},{"type":"Feature","properties":{"resourceCoords":[492.0,894.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.443969,40.6043659]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0237__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p237 [3]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.42"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4064.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"1336.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0237__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0237","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"319.8,1251.1 319.7,1244.3 523.0,1227.5 681.4,1228.2 773.2,1227.9 961.1,1226.7 960.7,1085.0 953.7,1084.9 877.9,1042.1 617.0,1029.2 601.0,1044.0 223.4,1042.1 187.2,1147.2 185.0,1223.5 217.2,1223.0 217.2,1243.3 319.8,1251.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0237__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[961.0,1156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.432849,40.625907]}},{"type":"Feature","properties":{"resourceCoords":[217.0,1156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.438413,40.625408]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0238/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p238","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0238/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0238","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"741.4,141.9 728.7,147.2 961.0,285.1 997.7,277.2 1069.3,314.1 1087.0,323.3 1087.0,348.4 1017.2,363.0 877.4,469.8 895.5,557.4 937.1,548.2 931.2,1047.4 872.3,1039.5 873.2,1141.8 653.6,1261.3 639.6,1220.8 523.5,1224.8 524.7,1155.4 524.0,1073.6 526.2,993.6 515.8,992.0 507.6,887.7 510.9,888.1 489.7,740.5 424.6,719.9 360.3,673.1 337.5,703.8 327.5,717.2 113.9,672.8 113.3,677.0 65.5,606.0 66.0,517.2 108.4,377.9 45.7,173.0 52.4,79.7 84.2,51.7 194.1,43.4 218.9,159.1 295.5,210.4 329.6,195.9 380.0,124.7 405.4,130.8 532.2,48.4 731.0,111.7 741.4,141.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0238/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[693.0,1219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4440901,40.6098498]}},{"type":"Feature","properties":{"resourceCoords":[1123.0,342.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.445237,40.615215]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0239/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p239","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"32"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0239/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0239","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"253.3,325.7 215.2,344.2 177.4,263.9 287.6,128.3 351.6,98.1 346.8,74.1 384.8,83.5 411.2,70.0 451.1,53.4 486.8,137.4 518.8,123.3 528.1,146.3 659.1,147.1 657.4,157.1 728.8,171.0 747.8,64.5 825.9,62.3 833.9,62.4 857.1,62.3 857.8,175.8 933.2,175.6 932.0,326.4 932.0,483.0 930.4,510.5 865.6,737.3 860.8,765.0 855.5,846.0 846.2,845.6 797.9,985.1 789.9,982.0 776.8,1057.5 765.7,1129.7 770.6,1130.3 595.0,1337.9 602.6,1288.3 460.1,1210.5 279.1,1202.9 254.8,1251.5 145.2,1079.8 329.3,913.5 304.8,814.9 363.4,808.9 253.3,325.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0239/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[348.0,994.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.442991,40.6104]}},{"type":"Feature","properties":{"resourceCoords":[932.0,483.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4403896,40.6142758]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0240/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p240","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0240/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0240","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.1,1069.5 69.2,1190.4 174.3,1192.4 239.0,1226.7 524.7,1234.3 558.6,1216.1 578.3,1149.8 665.4,1159.6 720.5,1192.7 1017.4,1209.0 1057.1,1096.0 1053.8,951.0 1021.7,866.6 958.9,859.5 928.2,826.7 925.1,745.5 949.5,638.0 934.8,246.8 967.9,62.0 950.2,45.3 952.3,1.0 932.8,1.0 932.7,90.2 721.3,121.9 681.8,122.8 616.2,152.6 587.1,87.8 506.0,124.8 479.5,132.2 393.1,127.2 243.3,123.3 232.3,124.5 154.4,145.3 160.2,172.6 157.9,411.2 160.6,439.4 177.2,520.0 168.1,522.0 158.3,671.0 149.7,670.1 157.2,747.2 165.8,820.6 170.7,820.0 55.1,1069.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0240/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[493.0,912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.43730658602388,40.61026406450485]}},{"type":"Feature","properties":{"resourceCoords":[162.0,443.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.44009118622478,40.61264138204383]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0241/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p241","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"27"},{"label":"confidence","value":"0.20"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0241/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0241","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"949.0,1023.3 941.1,1024.5 932.2,1026.2 865.2,1039.0 863.4,1146.2 791.5,1143.7 791.5,1133.7 663.3,1153.6 650.5,1132.6 621.5,1151.5 573.4,1074.9 537.0,1097.5 513.3,1114.8 454.1,1109.9 375.1,1103.6 344.7,1124.7 81.8,1087.7 91.2,1078.1 70.3,1054.6 90.3,954.4 61.5,647.4 78.3,409.4 96.2,362.1 191.1,363.8 226.9,171.5 256.7,158.7 271.8,91.2 292.7,95.9 363.1,43.3 425.4,37.8 862.3,50.2 931.1,124.3 1056.5,164.7 1062.2,195.0 1060.1,258.4 1076.9,260.1 1071.1,542.8 1055.3,542.0 1054.3,614.5 1051.8,687.0 1047.8,755.8 1041.8,829.4 1018.5,833.1 967.5,889.1 949.2,1023.3 949.0,1023.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0241/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[381.0,1104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.446217,40.615111]}},{"type":"Feature","properties":{"resourceCoords":[440.0,384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.446963,40.61916]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0242/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p242","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.49"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0242/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0242","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"23.3,876.0 59.0,990.7 135.2,967.2 180.4,1120.2 228.7,1278.8 309.5,1254.8 321.0,1253.3 477.7,1253.1 568.2,1255.9 595.7,1247.5 679.5,1206.4 711.7,1273.3 779.5,1240.5 820.7,1238.3 1040.9,1199.2 1038.4,1104.9 1058.9,1104.4 1070.2,559.9 1087.0,560.0 1064.2,558.5 1063.3,528.8 1003.1,469.2 1057.0,467.7 995.0,327.1 892.3,330.1 864.0,331.3 809.9,333.5 788.0,334.6 720.9,132.5 717.7,34.8 714.6,35.0 716.1,69.6 542.4,39.4 22.3,56.2 3.8,1.0 1.3,1.0 7.1,57.5 25.1,57.0 59.8,357.0 42.9,358.4 52.3,435.4 60.1,512.4 65.7,585.8 70.0,664.6 46.0,671.9 1.0,737.1 1.0,882.9 23.3,876.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0242/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[464.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.43947240721542,40.62076261656488]}},{"type":"Feature","properties":{"resourceCoords":[377.0,917.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.43957326599653,40.61625251582898]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0244/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p244","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0244/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0244","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"248.2,966.5 227.7,967.0 169.8,776.2 169.4,684.7 166.5,684.8 161.0,344.6 145.4,333.3 167.4,244.6 123.3,167.7 87.7,164.8 87.6,155.4 165.3,153.2 172.3,151.1 320.0,151.0 473.9,149.7 571.0,147.2 629.9,147.1 656.5,147.1 656.9,169.3 916.5,182.1 916.8,216.4 918.6,384.8 920.7,521.7 944.4,521.4 942.7,678.1 930.8,678.3 947.3,960.0 925.0,960.4 924.4,985.9 930.5,1023.0 951.7,1062.4 932.4,1072.0 921.1,1070.8 734.6,1193.7 502.5,1185.5 480.6,1183.5 480.4,1155.6 425.6,1098.3 476.0,1098.3 421.6,965.2 325.4,965.5 248.2,966.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0244/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[480.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.435195,40.619689]}},{"type":"Feature","properties":{"resourceCoords":[320.0,151.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.437058,40.624159]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0245/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p245","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.29"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0245/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0245","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"91.0,1094.9 68.9,1052.4 63.0,1012.5 64.0,985.1 87.9,985.0 74.4,683.1 87.2,683.1 91.4,515.3 66.0,515.2 65.8,368.6 66.4,188.1 66.8,111.8 72.6,109.7 210.6,111.0 350.6,111.0 351.5,22.4 506.8,23.4 527.9,23.4 527.9,39.4 755.6,49.6 755.8,24.6 867.0,24.4 1006.2,26.0 1004.5,115.3 1004.4,285.5 1003.4,372.2 1014.3,372.2 1035.9,607.8 1013.9,612.5 1025.2,726.7 1014.3,729.4 1002.0,947.2 991.2,1119.8 988.4,1174.9 984.0,1219.6 950.1,1255.1 681.6,1200.5 331.1,1204.9 209.2,1171.4 149.4,1114.9 70.2,1104.9 91.0,1094.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0245/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[130.0,675.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.43171755608408,40.621660027997805]}},{"type":"Feature","properties":{"resourceCoords":[779.0,225.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.42763109834546,40.62444929990226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0246__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p246 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.62"},{"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":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0246__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0246","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.7,77.2 173.8,162.0 174.8,323.7 174.4,406.1 184.8,405.9 206.9,629.6 186.1,634.2 197.6,742.6 187.3,745.2 177.1,952.2 168.0,1116.2 165.7,1168.6 161.9,1211.0 177.4,1194.5 323.6,1177.8 543.1,1221.1 602.5,969.2 689.2,979.5 720.6,1002.9 730.1,984.4 783.4,988.4 835.0,965.2 914.2,977.1 935.8,960.1 943.6,465.1 901.0,147.3 907.7,110.3 908.9,74.9 818.4,76.7 575.0,77.0 373.3,77.5 174.7,77.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0246__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[575.0,405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.42304,40.624097]}},{"type":"Feature","properties":{"resourceCoords":[575.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.423325,40.625908]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0247/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p247","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0247/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0247","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"59.0,1268.3 101.4,50.4 357.0,123.6 487.6,42.5 621.4,81.2 707.5,33.6 876.7,67.3 999.8,39.9 1036.7,343.3 1087.0,444.7 1087.0,445.6 1076.5,677.7 1005.3,676.4 1003.6,825.8 994.9,1285.8 726.9,1279.2 512.5,1276.7 511.4,1324.8 73.0,1299.4 73.5,1268.5 59.0,1268.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0247/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[857.0,402.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4271739489666,40.62798927598714]}},{"type":"Feature","properties":{"resourceCoords":[999.0,676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.42652858283735,40.62729970694647]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0248/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p248","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.55"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0248/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0248","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"595.4,1205.0 514.8,1237.5 192.4,1260.2 73.8,1256.0 32.1,1215.5 34.3,81.6 46.5,47.6 98.8,22.9 217.5,55.2 336.3,51.7 422.9,23.9 826.1,25.2 1022.4,62.2 1073.7,254.3 1064.4,872.3 1055.5,872.4 1064.3,882.7 1064.1,894.9 1077.0,899.5 953.5,1000.4 932.4,977.0 720.5,1214.5 720.5,1231.0 595.4,1205.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0248/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[827.0,265.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.510687,40.62047]}},{"type":"Feature","properties":{"resourceCoords":[225.0,1179.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.512598,40.614508]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0249/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p249","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"33"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0249/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0249","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.7,854.6 116.8,695.6 125.2,184.7 729.4,187.7 1037.7,189.3 1031.1,700.4 1027.4,1190.2 116.1,1186.2 117.7,854.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0249/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[567.0,857.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.500713,40.603132]}},{"type":"Feature","properties":{"resourceCoords":[723.0,1189.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.499754,40.602414]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0250/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p250","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0250/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0250","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1007.1,171.8 1001.0,359.6 1049.5,1163.3 83.7,1176.9 78.5,691.2 75.8,184.3 1007.1,171.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0250/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[381.0,688.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.498259,40.604277]}},{"type":"Feature","properties":{"resourceCoords":[230.0,1020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.498383,40.603256]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0251/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p251","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"27"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0251/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0251","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1087.0,264.3 957.1,167.9 936.4,156.3 871.4,136.4 695.0,104.8 393.8,46.1 362.2,39.6 361.6,58.4 185.0,54.9 108.2,98.0 116.3,187.4 168.5,211.5 152.2,632.4 42.2,892.1 1.0,891.0 1.0,914.8 128.1,914.4 237.5,1107.8 321.0,1108.0 321.4,1289.7 1043.1,1284.6 1041.0,524.4 1040.8,421.2 1087.0,365.0 1087.0,264.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0251/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[679.0,632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4681276,40.5926162]}},{"type":"Feature","properties":{"resourceCoords":[321.0,1108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.468772,40.591006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0252/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p252","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0252/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0252","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"910.0,105.5 930.0,117.9 1062.2,121.4 1075.5,128.8 1048.9,351.1 1003.0,345.4 914.4,978.7 919.9,1050.7 940.2,1255.7 382.4,1217.3 382.4,1240.2 143.3,1241.2 25.7,951.7 25.8,874.3 26.7,102.7 910.0,105.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0252/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[387.0,687.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4650181552515,40.59207384452668]}},{"type":"Feature","properties":{"resourceCoords":[212.0,1237.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.46492164201474,40.5904686540934]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0253/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p253","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0253/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0253","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"130.7,1082.3 333.5,727.4 332.1,675.1 310.1,564.0 289.4,475.9 251.3,329.2 243.0,288.0 239.7,194.3 255.1,100.8 276.2,41.2 951.9,46.5 1055.0,77.7 1086.7,358.1 1032.8,715.5 1065.5,1135.6 1087.0,1159.9 1087.0,1186.7 967.5,1201.5 945.7,1192.2 66.3,1322.2 50.7,1218.0 89.0,1154.3 74.1,1052.5 130.7,1082.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0253/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[813.0,1209.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.46441879679762,40.59397699128085]}},{"type":"Feature","properties":{"resourceCoords":[-6.0,1330.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.46725141922724,40.59319083316239]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0254__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p254 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2322.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"3078.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0254__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0254","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"907.4,583.6 898.0,615.4 52.7,637.7 57.0,1007.1 17.5,1125.0 53.0,1124.7 51.2,1308.3 172.3,1308.2 303.8,1311.5 438.5,1311.9 447.6,1308.2 588.9,1310.6 959.0,1310.5 959.1,1126.7 961.8,626.4 953.3,580.5 907.4,583.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0254__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[957.0,977.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4476838322919,40.60835763704295]}},{"type":"Feature","properties":{"resourceCoords":[71.0,1307.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.44960103881321,40.60618485699821]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0255/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p255","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0255/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0255","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"131.9,723.5 265.6,258.2 148.2,168.3 136.6,151.0 137.8,142.3 571.8,234.0 592.3,206.7 638.9,144.6 769.4,240.0 901.5,282.4 943.7,582.6 937.1,581.8 952.9,793.8 974.3,797.3 969.1,960.0 970.1,1126.2 967.3,1267.4 596.5,1271.7 186.6,1272.5 187.1,766.5 178.3,720.1 131.9,723.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0255/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[603.0,954.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.44680408988411,40.609396976814345]}},{"type":"Feature","properties":{"resourceCoords":[1023.0,328.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.44688246771956,40.61145910818663]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p256 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"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":"3066.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2334.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1300.2 1.0,1300.3 397.5,1348.5 864.6,1292.6 939.4,1321.3 968.6,1317.7 969.5,930.4 967.9,806.0 858.0,782.9 524.0,791.2 480.1,830.0 128.8,792.1 83.8,792.4 102.9,1003.5 91.4,1061.1 63.5,1089.5 25.1,1097.0 184.1,1106.7 153.7,1197.4 145.1,1243.8 144.9,1308.0 1.0,1300.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[358.0,1286.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.442652,40.623641]}},{"type":"Feature","properties":{"resourceCoords":[969.0,1109.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.440513,40.624333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p256 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.83"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"3066.0"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"869.2,765.5 870.6,765.5 1049.3,765.5 1045.2,700.7 1050.8,653.2 1075.2,559.7 914.4,560.5 952.6,550.4 978.8,519.9 986.5,461.0 953.0,249.2 992.0,245.6 1017.9,40.3 969.4,27.8 867.6,91.2 769.3,90.8 755.5,163.8 647.6,158.0 575.0,45.8 452.8,34.2 50.1,115.7 18.3,428.9 69.1,761.4 696.0,716.7 767.4,760.0 869.2,765.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0256__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[953.0,249.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.443865,40.62491]}},{"type":"Feature","properties":{"resourceCoords":[364.0,532.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.445938,40.624046]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p257 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.79"},{"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":"4352.0"},{"label":"split_canvas_h","value":"2005.6"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"111.1,492.3 336.3,463.6 410.9,464.2 410.9,470.1 560.0,483.0 560.0,464.1 715.7,460.6 729.7,456.5 1025.5,458.2 1026.7,286.8 1031.9,286.8 1039.0,177.4 716.5,152.6 716.6,111.4 651.4,112.3 651.1,120.9 519.7,134.1 415.4,121.7 380.1,54.9 385.7,1.0 313.9,1.0 307.6,99.2 151.1,80.6 111.7,1.0 111.2,1.0 111.1,111.3 111.1,492.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[716.0,287.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.438277,40.624535]}},{"type":"Feature","properties":{"resourceCoords":[111.0,287.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.440513,40.624333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p257 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1973.6"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"1662.8"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"926.8,884.6 1046.0,711.6 1019.5,711.7 1046.5,545.3 936.9,545.5 747.4,545.0 420.0,541.9 1.0,574.5 1.0,588.6 117.4,598.0 109.7,709.5 104.3,709.5 102.3,884.3 417.1,884.9 615.6,882.1 736.0,883.1 885.9,884.5 926.8,884.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[736.0,883.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434766,40.624377]}},{"type":"Feature","properties":{"resourceCoords":[420.0,541.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.436062,40.625209]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p257 [3]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.57"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3636.4"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"1763.6"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.2,1101.9 250.1,1102.0 132.8,1270.0 92.9,1269.7 1.0,1268.3 1.0,1312.7 517.0,1346.8 517.6,1273.2 528.3,1269.2 785.3,1272.3 1046.0,1273.0 1048.0,1108.1 521.0,1103.1 523.1,941.0 251.6,939.7 224.2,1101.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0257__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[521.0,1103.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.432716,40.625049]}},{"type":"Feature","properties":{"resourceCoords":[1046.0,1273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.430688,40.624762]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0258/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p258","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0258/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0258","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"787.1,34.7 564.1,55.9 490.8,27.9 429.5,58.9 360.9,31.5 254.3,81.0 100.8,81.8 29.2,399.2 52.1,728.0 20.8,726.4 173.6,813.0 187.8,813.2 188.0,1099.0 187.4,1261.4 715.0,1261.4 1004.5,1261.3 1030.0,1261.1 1047.3,82.7 1031.1,78.3 1029.4,1.0 792.4,1.0 787.1,34.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0258/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[188.0,375.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.433108,40.627543]}},{"type":"Feature","properties":{"resourceCoords":[188.0,1099.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.432786,40.625506]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0259/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p259","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0259/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0259","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"742.8,1232.7 440.8,1160.7 114.2,1168.3 129.8,927.3 88.1,756.8 141.4,525.4 63.7,447.6 120.0,347.7 120.7,148.5 303.7,122.9 440.7,154.7 533.5,74.0 628.0,56.7 682.3,243.3 961.6,224.9 1031.7,170.6 1076.4,317.1 1003.5,356.6 981.2,572.5 1020.0,766.9 983.5,786.6 961.9,958.8 1004.3,969.0 990.5,1117.9 1032.9,1167.0 964.7,1245.9 966.2,1337.0 726.2,1335.7 742.8,1232.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0259/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43430183546128,40.63225654557378]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43032431155933,40.63263563807253]}},{"type":"Feature","properties":{"resourceCoords":[1088.0,1350.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.42970477680089,40.62888847961863]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1350.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43368230070284,40.628509387119884]}},{"type":"Feature","properties":{"resourceCoords":[113.0,250.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.433774,40.631602]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p260 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2778.8"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2621.2"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"868.1,1327.5 1011.2,1286.0 1001.8,1242.0 908.4,1222.2 897.2,762.8 858.9,720.4 309.5,721.7 273.6,707.7 211.6,708.7 215.9,1270.5 692.1,1265.9 869.3,1260.8 868.1,1327.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[210.0,819.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.42353259122194,40.6271808962548]}},{"type":"Feature","properties":{"resourceCoords":[858.0,1267.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.42093746053492,40.62611832464437]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1958 | sanborn07494_008 p260 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2848.4"}],"created":"2026-10-18T16:39:59Z","modified":"2026-10-18T16:39:59Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260","type":"ImageService3","width":1088,"height":1350},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.2,649.1 530.8,647.7 933.7,644.5 931.4,70.5 994.6,69.8 891.2,29.2 198.4,76.9 198.9,48.5 128.8,49.0 131.0,196.0 134.2,649.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195802:07494_02_1958-0260__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[529.0,488.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.424865,40.626213]}},{"type":"Feature","properties":{"resourceCoords":[131.0,196.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.426437,40.626895]}}]}}]}