{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn07494_006.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Allentown, Pennsylvania | 1950 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"125"},{"label":"placed","value":"96"},{"label":"unplaced","value":"29"},{"label":"fit sources","value":"georef 72, georef-snap 32"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"15 sheet(s) cut into 37 panels"},{"label":"unplaced pages","value":"p0 (tier 4, 40.60314,-75.47105 +/-4773m); p15__2 (tier 1, 40.60592,-75.45677 +/-100m); p18__2 (tier 1, 40.60962,-75.49108 +/-139m); p201__2 (tier 1, 40.60470,-75.52529 +/-155m); p215__2 (tier 1, 40.58124,-75.52449 +/-192m); p216__1 (tier 1, 40.62393,-75.42269 +/-379m); p216__2 (tier 3, 40.62174,-75.42233 +/-1191m); p216__3 (tier 1, 40.62057,-75.42253 +/-103m); p216__4 (tier 3, 40.62174,-75.42233 +/-1191m); p216__5 (tier 3, 40.62174,-75.42233 +/-1191m); p216__6 (tier 3, 40.62174,-75.42233 +/-1191m); p216__7 (tier 1, 40.62035,-75.41972 +/-100m); p217__1 (tier 1, 40.52514,-75.50366 +/-371m); p217__2 (tier 2, 40.59521,-75.47385 +/-414m); p217__3 (tier 2, 40.59521,-75.47385 +/-414m); p219__2 (tier 2, 40.58917,-75.47978 +/-674m); p222__1 (tier 1, 40.59424,-75.46313 +/-200m); p234__2 (tier 2, 40.61683,-75.43304 +/-366m); p34__1 (tier 2, 40.60165,-75.46642 +/-4309m); p40__2 (tier 1, 40.59319,-75.47837 +/-155m); p43 (tier 2, 40.61217,-75.47260 +/-1921m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p1","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0001/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"815.1,2245.0 -0.0,1925.3 -0.0,1193.7 -0.0,1193.7 -0.0,877.4 5822.0,859.3 5837.4,3534.9 5614.7,3533.9 5638.5,7059.6 6688.0,7052.5 6688.0,7680.0 -0.0,7680.0 -0.0,3209.1 581.3,2987.5 781.0,2665.7 815.1,2245.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5828.0,1896.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4716088,40.5998602]}},{"type":"Feature","properties":{"resourceCoords":[2508.0,1908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4734797,40.5993424]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p10","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"25"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0010/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7186.3 -0.0,560.4 5790.8,512.1 5848.0,5524.0 4967.4,5530.9 4979.8,7156.9 -0.0,7186.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5848.0,5524.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4694038,40.6020294]}},{"type":"Feature","properties":{"resourceCoords":[4140.0,3856.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4707051,40.6024907]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p11","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"32"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0011/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"858.7,0.0 5769.8,0.0 5836.3,7134.7 5026.3,7146.3 5026.2,6550.9 4153.6,6544.7 4156.5,7158.9 -0.0,7164.0 -0.0,5538.4 879.8,5538.2 858.7,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4156.0,5500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4675548,40.6025515]}},{"type":"Feature","properties":{"resourceCoords":[2468.0,3840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4688489,40.6030053]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p12","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0012/info.json","type":"ImageService2","height":7680,"width":6648},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"796.2,1210.7 4016.5,1182.2 3987.3,6788.8 3490.7,6789.8 3492.4,7130.1 845.6,7184.1 796.2,1210.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2316.0,4780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.465912,40.6033799]}},{"type":"Feature","properties":{"resourceCoords":[812.0,4780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4667747,40.6031494]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0013/info.json","type":"ImageService2","height":7680,"width":6624},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5804.2,4046.4 5819.9,7680.0 -0.0,7680.0 -0.0,873.5 5055.0,808.4 5153.3,4086.5 5804.2,4046.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46595064357255,40.605839320993695]}},{"type":"Feature","properties":{"resourceCoords":[6624.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46220752557096,40.60683645232604]}},{"type":"Feature","properties":{"resourceCoords":[6624.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46069545142025,40.60351831325064]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46443856942184,40.60252118191829]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p14","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"16"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0014/info.json","type":"ImageService2","height":7680,"width":6648},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1740.6,7680.0 1740.2,4141.0 1094.5,4180.8 1011.9,911.6 5306.7,865.7 5423.1,7326.8 4518.7,7680.0 1740.6,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4092.0,880.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4611867,40.6067325]}},{"type":"Feature","properties":{"resourceCoords":[5360.0,5376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.459565,40.6049804]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0015__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 | 1950 | sanborn07494_006 p15 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"13"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6612.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0015__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0015/info.json","type":"ImageService2","height":7680,"width":6612},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3541.7,5859.9 4469.2,5352.3 4924.5,4914.3 5809.7,4489.5 4087.3,3700.6 5335.2,3643.6 5890.5,1074.0 5795.1,765.2 5495.9,556.4 4559.0,520.4 4641.9,0.0 985.2,0.0 711.9,0.0 718.8,6885.0 3541.7,5859.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0015__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[684.0,6344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4592736,40.6043764]}},{"type":"Feature","properties":{"resourceCoords":[2404.0,520.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.459523,40.6071928]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p16","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0016/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2930.0,7680.0 1311.2,5030.4 2365.7,4367.2 2355.1,4348.4 3524.0,3638.9 4733.7,2075.8 5014.5,1517.2 6616.0,507.1 6616.0,7680.0 5464.2,7680.0 5475.0,7453.6 4898.9,6543.6 3151.1,7680.0 2930.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4900.0,664.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.457177,40.606303]}},{"type":"Feature","properties":{"resourceCoords":[2636.0,4824.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4609494,40.602946]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p17","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"37"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0017/info.json","type":"ImageService2","height":7680,"width":6612},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6994.7 -0.0,1056.2 516.7,1050.3 522.6,511.2 6083.9,529.4 6014.9,7031.5 -0.0,6994.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3292.0,6040.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.48625,40.600303]}},{"type":"Feature","properties":{"resourceCoords":[4208.0,1492.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4866873,40.6023969]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0018__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 | 1950 | sanborn07494_006 p18 [1]","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"41"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6616.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0018__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0018/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"556.4,0.0 448.5,6990.1 3959.2,7022.4 3959.2,6742.8 6196.4,6796.4 6616.0,6802.0 6616.0,35.7 556.4,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0018__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3192.0,7016.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.482958,40.6007429]}},{"type":"Feature","properties":{"resourceCoords":[5844.0,1504.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4826365,40.6035229]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p19","metadata":[{"label":"streets","value":"18"},{"label":"intersections","value":"55"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0019/info.json","type":"ImageService2","height":7680,"width":6612},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5906.8,0.0 5779.4,7069.9 1473.7,7014.8 1482.3,0.0 5906.8,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[708.0,1468.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4826365,40.6035229]}},{"type":"Feature","properties":{"resourceCoords":[4244.0,4720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4799587,40.6027074]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p2","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0002/info.json","type":"ImageService2","height":7680,"width":6664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4658.4,5890.2 4631.0,7680.0 -0.0,7680.0 -0.0,3884.0 239.7,3886.7 243.2,378.0 4742.1,424.6 4658.4,5890.2 4658.4,5890.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4912.0,6924.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4682439,40.5986362]}},{"type":"Feature","properties":{"resourceCoords":[2036.0,400.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.471002,40.600806]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p20","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"24"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0020/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6438.9,67.3 6448.5,575.5 4633.5,581.6 4759.5,7078.2 5536.2,7072.9 5543.9,7680.0 1188.9,7680.0 1123.5,0.0 6616.0,0.0 6438.9,67.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1980.0,2252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4791043,40.6041628]}},{"type":"Feature","properties":{"resourceCoords":[3896.0,3840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4777027,40.6037668]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0201__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 | 1950 | sanborn07494_006 p201 [1]","metadata":[{"label":"streets","value":"19"},{"label":"intersections","value":"51"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6580.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0201__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0201/info.json","type":"ImageService2","height":7680,"width":6580},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"726.7,2092.2 -0.0,2046.4 -0.0,7680.0 461.0,7680.0 461.3,7487.9 944.2,7483.5 942.8,7680.0 3243.6,7680.0 3253.3,7033.7 2805.5,7031.1 2807.3,6780.3 4461.7,6785.8 4456.4,6482.4 4437.6,5409.2 5447.1,5453.7 5450.7,5167.6 6051.5,5177.3 6081.0,1932.6 6564.2,1946.1 6570.6,564.2 6098.7,561.3 6104.9,87.9 5402.2,83.7 5402.8,0.0 5047.2,0.0 858.4,0.0 726.7,2092.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0201__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3740.0,2408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50782,40.60812]}},{"type":"Feature","properties":{"resourceCoords":[2360.0,3780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.508805,40.606505]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0202/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p202","metadata":[{"label":"streets","value":"23"},{"label":"intersections","value":"76"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0202/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0202/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5252.3 600.6,5254.5 589.9,2011.2 1072.9,2018.7 1062.2,637.5 590.5,640.4 590.8,167.2 -0.0,171.0 -0.0,-0.0 6153.7,0.0 6154.0,129.0 6608.0,125.8 6608.0,3458.4 4305.7,3452.5 4305.6,3864.0 3294.8,3868.7 3287.6,6855.3 3841.4,6852.3 3846.8,7577.1 3394.2,7579.8 3394.0,7680.0 614.1,7680.0 613.9,7596.1 -0.0,7599.7 -0.0,5252.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0202/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2452.0,3872.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.502508,40.608239]}},{"type":"Feature","properties":{"resourceCoords":[3840.0,5724.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5001834,40.6070688]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0203/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p203","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"37"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0203/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0203/info.json","type":"ImageService2","height":7680,"width":6580},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"551.4,118.9 547.6,807.1 5560.7,800.1 5560.5,874.1 6133.9,874.6 6127.4,2033.8 5557.7,2031.7 5553.7,3656.4 5657.9,3656.7 5638.9,7066.0 6580.0,7083.0 6580.0,7680.0 964.8,7680.0 985.8,3649.7 -0.0,3648.2 -0.0,390.0 304.0,117.6 551.4,118.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0203/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2396.0,3652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.517313,40.594418]}},{"type":"Feature","properties":{"resourceCoords":[5648.0,2032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.514321,40.596816]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0204/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p204","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"40"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0204/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0204/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3100.7 -0.0,2618.5 576.1,2618.2 577.4,2142.4 -0.0,2143.3 -0.0,478.0 580.6,479.5 584.4,0.0 5667.9,0.0 5666.2,1257.8 6126.7,1254.7 6128.2,1542.1 5639.1,1543.5 5619.1,2615.8 6608.0,2615.3 6608.0,7346.7 6132.0,7346.4 6131.2,6862.2 2654.1,6867.2 2659.1,7347.0 -0.0,7348.8 -0.0,5735.4 565.8,5736.1 569.5,4585.0 -0.0,4585.8 -0.0,4512.4 570.2,4510.2 571.6,4114.2 953.8,4113.9 954.1,3715.6 572.7,3716.5 574.3,3099.7 -0.0,3100.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0204/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2900.0,3096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.51222,40.599965]}},{"type":"Feature","properties":{"resourceCoords":[6132.0,7348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5068084,40.5973137]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__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 | 1950 | sanborn07494_006 p205 [1]","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"42"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6560.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3268.1,246.8 3266.3,889.7 977.6,917.5 976.5,722.0 496.3,732.2 501.3,1209.6 -0.0,1213.7 -0.0,2281.5 984.8,2275.8 1006.5,6333.5 4317.5,6364.1 4318.0,5545.2 5327.2,5522.9 5323.5,0.0 2821.3,0.0 2822.6,249.6 3268.1,246.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2356.0,3756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.5060483,40.6006775]}},{"type":"Feature","properties":{"resourceCoords":[5560.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.50344,40.603894]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__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 | 1950 | sanborn07494_006 p205 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"4316.8"},{"label":"split_canvas_y","value":"5495.6"},{"label":"split_canvas_w","value":"2243.2"},{"label":"split_canvas_h","value":"2184.4"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6560.0,7680.0 6560.0,5495.6 4318.0,5545.2 4316.8,7680.0 6560.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0205__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4484.7,6713.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.514152,40.607743]}},{"type":"Feature","properties":{"resourceCoords":[6248.1,5703.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.512427,40.609126]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0206/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p206","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0206/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0206/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"253.9,7031.8 -0.0,7032.1 -0.0,0.4 108.7,0.0 108.0,727.9 726.3,727.6 726.4,811.7 3526.2,826.7 3523.2,1812.3 3413.8,1812.8 3410.5,2769.3 3522.9,2769.1 3525.4,3781.4 6067.2,3778.0 6099.3,7026.6 4473.5,7028.1 4474.5,7500.0 4401.1,7500.1 2606.4,7501.5 2606.7,7029.8 1673.3,7030.5 1673.8,7499.7 254.8,7509.9 253.9,7031.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0206/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50420027605249,40.60486567800756]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49680259092725,40.60690079242069]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49369406665294,40.600294934326136]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50109175177818,40.59825981991301]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0207/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p207","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0207/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0207/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3859.7 -0.0,477.5 2567.1,479.4 2560.6,0.0 6053.2,0.0 6055.5,483.7 6560.0,484.6 6560.0,2105.7 5905.3,2218.2 5567.5,2355.4 5519.3,6546.6 -0.0,6553.8 -0.0,4468.7 942.0,4467.8 938.7,3875.5 -0.0,3859.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0207/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.51383713361469,40.59584352741173]}},{"type":"Feature","properties":{"resourceCoords":[6560.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.5064372566836,40.59788966875504]}},{"type":"Feature","properties":{"resourceCoords":[6560.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50330469031972,40.59126484073509]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.51070456725081,40.589218699391786]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0208/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p208","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0208/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0208/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6100.7,83.6 6100.5,941.8 6608.0,942.6 6608.0,3916.1 6100.1,3914.9 6100.3,2598.3 5573.2,2597.0 5623.7,7232.9 6096.8,7350.0 6099.9,4878.4 6608.0,4879.9 6608.0,7484.3 6526.9,7680.0 -0.0,7680.0 -0.0,-0.0 5575.1,0.0 5572.9,168.3 6100.7,83.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0208/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.51121312888351,40.59017649125884]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50377885044003,40.59224057796225]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50064202883857,40.58563274112489]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50807630728205,40.58356865442148]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0209/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p209","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"28"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0209/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0209/info.json","type":"ImageService2","height":7680,"width":6572},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"966.7,656.4 464.4,665.2 453.7,0.0 5271.2,0.0 5277.0,593.1 5529.0,589.3 5534.6,1066.2 6010.6,1056.0 6016.8,2197.1 6572.0,2188.1 6572.0,3808.4 5456.9,3827.4 5508.3,7680.0 161.8,7680.0 509.0,6850.4 -0.0,6910.2 -0.0,2531.6 985.3,2279.4 966.7,656.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0209/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2996.0,628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.503939,40.5981039]}},{"type":"Feature","properties":{"resourceCoords":[4228.0,7144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4999656,40.5928363]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p21","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"33"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0021/info.json","type":"ImageService2","height":7680,"width":6580},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1819.6,0.0 5821.3,0.0 5804.4,7043.5 -0.0,6994.4 -0.0,480.4 1819.3,509.5 1819.6,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3196.0,3768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4754479,40.6043844]}},{"type":"Feature","properties":{"resourceCoords":[792.0,5396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4764596,40.6033091]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0210/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p210","metadata":[{"label":"streets","value":"22"},{"label":"intersections","value":"49"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0210/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0210/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1133.3,2172.0 579.8,2173.5 588.8,1036.0 1518.1,1028.3 1519.3,561.7 2442.8,560.0 2440.8,1029.2 4216.6,1026.0 4289.2,1025.8 4289.8,556.4 5151.0,554.8 5207.8,7680.0 -0.0,7680.0 -0.0,5430.8 -0.0,3791.3 1111.8,3787.1 1133.3,2172.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0210/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4284.0,6264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.493985,40.595274]}},{"type":"Feature","properties":{"resourceCoords":[2436.0,3788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4971041,40.5968359]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0211/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p211","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0211/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0211/info.json","type":"ImageService2","height":7680,"width":6584},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"68.4,7244.6 -0.0,1285.4 146.5,946.4 5501.4,1017.9 5955.1,7112.6 5598.1,7680.0 976.3,7680.0 68.4,7244.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0211/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50493366954287,40.591924351025426]}},{"type":"Feature","properties":{"resourceCoords":[6584.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4975235512806,40.59395703157191]}},{"type":"Feature","properties":{"resourceCoords":[6584.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49442311623446,40.58734683418211]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50183323449673,40.58531415363562]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0212/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p212","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"14"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0212/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0212/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6608.0,7680.0 -0.0,7680.0 -0.0,7178.1 360.7,7045.9 -0.0,5874.4 30.5,1037.4 6608.0,1064.1 6608.0,1781.3 6138.0,1778.7 6123.4,3084.4 6603.5,3088.0 6608.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0212/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5052.0,6280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4903579,40.5898089]}},{"type":"Feature","properties":{"resourceCoords":[6148.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4913612,40.5947426]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0213/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p213","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0213/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0213/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 6560.0,0.0 6560.0,3185.9 6186.9,3184.5 6183.5,3662.5 5601.7,3658.7 5602.8,5318.6 6181.4,5319.9 6180.4,5794.2 5603.1,5792.3 5603.5,6272.9 6179.0,6274.1 6177.8,6888.9 6560.0,6889.4 6560.0,7286.5 6176.9,7285.3 6175.8,7680.0 3394.8,7680.0 3394.8,7680.0 616.0,7680.0 617.7,6881.1 482.7,6880.9 113.5,7266.5 -0.0,7266.2 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0213/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.52441768176392,40.60271089987772]}},{"type":"Feature","properties":{"resourceCoords":[6560.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.51700690510916,40.60477539721715]}},{"type":"Feature","properties":{"resourceCoords":[6560.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.51384591003516,40.59814149608848]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.52125668668992,40.59607699874905]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0214/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p214","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0214/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0214/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2111.5 2144.9,2131.6 2148.6,1372.9 1333.9,389.6 1818.1,0.0 6608.0,0.0 6608.0,7203.3 6288.8,7202.6 6289.2,7073.8 112.8,7017.4 112.0,7188.1 -0.0,7187.8 -0.0,2111.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0214/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50986490092207,40.61683582175669]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50241556631471,40.61890929290201]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49926322493046,40.6122907161996]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.50671255953782,40.61021724505428]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0215__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 | 1950 | sanborn07494_006 p215 [1]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"45"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6560.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0215__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0215/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3523.2,0.0 3516.0,1828.0 2189.6,2660.4 0.0,2658.8 -0.0,7680.0 6560.0,7680.0 6560.0,3505.6 5580.6,3509.2 5563.8,272.2 5494.1,272.4 5493.5,0.0 3523.2,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0215__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4252.0,4116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.521269,40.59274]}},{"type":"Feature","properties":{"resourceCoords":[5176.0,4116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.520221,40.593026]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0218/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p218","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0218/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0218/info.json","type":"ImageService2","height":7680,"width":6588},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6900.6 -0.0,1446.2 2190.3,1431.3 2186.7,1118.8 4030.7,1093.8 4081.7,1270.1 5793.1,1273.0 5919.9,5576.4 6085.0,5576.4 6146.3,6652.7 5951.5,6650.6 5981.8,7680.0 744.5,7680.0 733.5,7335.5 350.7,7477.8 346.0,6896.7 -0.0,6900.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0218/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47298709442379,40.59808861047336]}},{"type":"Feature","properties":{"resourceCoords":[6588.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4655464842035,40.60008116985026]}},{"type":"Feature","properties":{"resourceCoords":[6588.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4625088155039,40.5934484037998]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46994942572418,40.591455844422896]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0219__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 | 1950 | sanborn07494_006 p219 [1]","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"37"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6560.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0219__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0219/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2061.1 -0.0,7586.6 67.8,7680.0 2536.0,7680.0 3376.0,7680.0 3936.8,7680.0 3965.2,5967.2 4968.9,5976.3 4800.7,5269.5 5458.8,5276.7 5311.3,4633.0 4360.0,4855.7 4055.4,3535.9 6560.0,2957.9 6560.0,0.0 5851.2,0.0 3801.5,0.0 4061.3,1112.4 -0.0,2061.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0219__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3172.0,4412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4772073,40.5895678]}},{"type":"Feature","properties":{"resourceCoords":[3172.0,5256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.477083,40.588808]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p22","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"24"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0022/info.json","type":"ImageService2","height":7680,"width":6632},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"813.7,7133.8 759.2,0.0 5881.1,0.0 5903.6,7135.3 813.7,7133.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1468.0,2840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4738,40.605336]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,3864.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4711059,40.6055771]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0220/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p220","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0220/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0220/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 1154.3,0.0 1087.4,289.7 927.4,364.6 1028.6,544.8 759.4,1658.3 817.5,1761.6 5808.7,2922.3 5988.5,3075.4 5636.5,3458.8 5641.0,6329.1 6608.0,6332.1 6608.0,7680.0 -0.0,7680.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0220/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48204651585907,40.587532272753286]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47463829665166,40.58960810207276]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47148375667973,40.58302316236507]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47889197588714,40.5809473330456]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0221/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p221","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"46"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0221/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0221/info.json","type":"ImageService2","height":7680,"width":6592},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"350.8,4423.4 -0.0,4104.6 -0.0,3935.5 456.0,3416.3 344.5,3321.1 334.6,1847.2 971.0,2001.4 972.0,1344.4 -0.0,1347.5 -0.0,-0.0 5691.9,0.0 5687.5,582.7 6071.4,444.3 6091.8,3267.8 6592.0,3264.1 6592.0,7680.0 -0.0,7680.0 -0.0,4808.1 350.8,4423.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0221/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3324.0,4420.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4707173,40.5877102]}},{"type":"Feature","properties":{"resourceCoords":[2764.0,3292.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.471814,40.588501]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0222__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 | 1950 | sanborn07494_006 p222 [2]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"29"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6608.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0222__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0222/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"591.2,1192.3 588.7,3684.0 1091.7,3683.8 1079.7,5402.4 3269.2,5406.4 3244.4,7680.0 4376.0,7680.0 4673.7,7680.0 5139.5,5927.2 6608.0,6315.2 6608.0,2408.9 5849.3,2417.5 5841.9,1288.4 591.2,1192.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0222__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3932.0,2556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4648008,40.5915823]}},{"type":"Feature","properties":{"resourceCoords":[588.0,844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4692573,40.5919752]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0223/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p223","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0223/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0223/info.json","type":"ImageService2","height":7680,"width":6604},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4422.1 -0.0,72.3 786.3,96.8 782.4,265.5 4243.2,362.5 4251.7,0.0 6604.0,0.0 6595.7,1108.5 6459.5,1297.7 6604.0,1390.9 6604.0,4542.9 6349.2,4469.9 5957.4,5836.3 6116.2,6342.9 6068.1,6357.4 6066.0,7680.0 -0.0,7680.0 -0.0,5507.7 196.7,5515.9 166.7,4427.1 -0.0,4422.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0223/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4659714952361,40.598802508775286]}},{"type":"Feature","properties":{"resourceCoords":[6604.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45866845560876,40.600944822503756]}},{"type":"Feature","properties":{"resourceCoords":[6604.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45541035285707,40.59445055367338]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46271339248442,40.59230823994491]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0224/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p224","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0224/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0224/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1000.3,6898.7 1888.3,7153.2 2393.8,5806.9 1318.2,5513.4 1337.8,1622.1 6608.0,1614.2 6608.0,4829.9 6144.1,5230.4 5805.4,4137.8 5381.0,4268.8 5296.4,3993.8 4869.1,5492.7 5324.3,5611.7 5117.3,6356.2 6608.0,6762.5 6608.0,7680.0 2908.6,7680.0 2701.9,7536.2 2647.3,7680.0 1874.7,7680.0 823.2,7379.1 1000.3,6898.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0224/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46404673986095,40.59350211926371]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45669140480105,40.59565004073987]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45342701112442,40.58911270627636]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46078234618432,40.5869647848002]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0225/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p225","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0225/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0225/info.json","type":"ImageService2","height":7680,"width":6572},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2636.4,0.0 2503.3,1431.2 1579.9,1419.5 1535.6,1929.3 2628.8,1942.8 3373.8,1739.4 3388.6,1586.4 3825.9,1741.7 3837.1,1613.0 4926.2,1315.8 4903.0,2791.3 5401.8,2800.6 5442.2,3236.8 4926.0,3423.4 4925.9,3780.3 5334.3,4327.8 4925.8,4476.2 4925.6,6362.5 6275.1,6348.1 6285.6,7680.0 3718.0,7680.0 3611.6,7320.7 2639.9,7570.2 2077.1,7440.7 1598.4,7680.0 -0.0,7680.0 -0.0,-0.0 2636.4,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0225/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46204120093361,40.58910135040908]}},{"type":"Feature","properties":{"resourceCoords":[6572.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45424558497778,40.5896894710212]}},{"type":"Feature","properties":{"resourceCoords":[6572.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45334694060433,40.58272230262595]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46114255656016,40.58213418201383]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0226/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p226","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0226/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0226/info.json","type":"ImageService2","height":7680,"width":6612},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5653.0,7162.4 5697.6,7680.0 -0.0,7680.0 -0.0,5650.8 361.2,5213.0 568.9,4249.3 931.4,4313.7 2059.7,2056.8 884.4,1480.9 1677.7,-0.0 5392.6,-0.0 6612.0,380.8 6612.0,2408.2 6177.0,2417.5 6197.2,3463.8 6612.0,3459.4 6612.0,5937.9 6251.0,5903.2 6266.0,7153.8 5762.9,7099.1 5653.0,7162.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0226/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.452906575792,40.58533031153712]}},{"type":"Feature","properties":{"resourceCoords":[6612.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44863350340056,40.5801394590517]}},{"type":"Feature","properties":{"resourceCoords":[6612.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45651651077053,40.576343305637664]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46078958316197,40.581534158123084]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0227/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p227","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0227/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0227/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 2666.1,0.0 2714.5,412.2 3227.8,306.7 3292.1,371.8 3308.5,919.7 4559.6,757.6 4567.3,1123.3 6087.4,944.9 6076.8,5100.5 5430.7,5068.9 5407.1,6721.0 6576.0,6737.8 6576.0,7680.0 2971.1,7680.0 2947.7,7600.9 2712.5,7680.0 -0.0,7680.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0227/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46026728676603,40.57632852959395]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45312949209598,40.57893246811682]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44915379530624,40.57255599764118]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45629158997629,40.569952059118314]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0228/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p228","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0228/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0228/info.json","type":"ImageService2","height":7680,"width":6624},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1574.4,1785.9 1507.6,1318.5 2557.0,1159.4 2624.1,1595.5 4662.6,1326.5 4877.0,0.0 6624.0,0.0 6624.0,7680.0 -0.0,7680.0 -0.0,6018.6 650.0,6041.0 600.9,1862.5 1574.4,1785.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0228/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4547537100623,40.579273207966054]}},{"type":"Feature","properties":{"resourceCoords":[6624.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44755513822206,40.58180301023609]}},{"type":"Feature","properties":{"resourceCoords":[6624.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44372045047058,40.575419130346035]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45091902231083,40.572889328076]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0229/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p229","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0229/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0229/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"465.2,6933.1 467.4,7294.2 -0.0,7304.4 -0.0,5755.8 155.8,5995.6 525.6,5754.7 1146.8,6706.6 1481.0,6197.4 247.0,1868.5 288.7,1841.6 -0.0,1403.9 -0.0,-0.0 6576.0,0.0 6576.0,5552.5 6207.6,5550.0 6208.9,6132.6 5474.0,6133.4 5478.0,6877.2 4614.9,6886.8 4620.6,7270.0 3515.3,7272.3 3516.3,6899.1 2593.3,6900.3 2591.8,7274.9 997.1,7286.8 762.7,6929.8 465.2,6933.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0229/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45705399180699,40.597082393189865]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44919786647931,40.59760676307079]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44839702516421,40.590590618934215]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45625315049189,40.59006624905329]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p23","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"24"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0023/info.json","type":"ImageService2","height":7680,"width":6592},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"956.6,0.0 5869.2,95.9 5757.7,6621.6 885.6,6549.7 956.6,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4196.0,3880.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4692302,40.6060971]}},{"type":"Feature","properties":{"resourceCoords":[880.0,7076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4704325,40.6041814]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0230/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p230","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0230/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0230/info.json","type":"ImageService2","height":7680,"width":6648},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5770.0 406.4,5622.2 -0.0,5084.4 -0.0,4722.4 513.6,4536.7 473.3,4102.7 -0.0,4093.9 -0.0,2625.3 2255.6,2009.4 2034.5,1129.1 478.5,1129.9 483.9,0.0 781.8,0.0 1012.3,359.9 2608.8,365.9 2614.4,0.0 3538.3,0.0 3533.2,373.6 4639.6,383.5 4638.1,0.0 6648.0,0.0 6648.0,4569.0 6212.0,4565.1 6232.4,1532.3 5493.6,1527.4 5471.1,5502.4 6648.0,5509.9 6648.0,7680.0 -0.0,7646.8 -0.0,5770.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0230/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4563521951907,40.59074222856847]}},{"type":"Feature","properties":{"resourceCoords":[6648.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44842643873335,40.59133940154919]}},{"type":"Feature","properties":{"resourceCoords":[6648.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44752437193722,40.58433707122477]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45545012839457,40.583739898244055]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0231/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p231","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0231/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0231/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1230.8 738.7,1234.1 740.6,648.6 1110.9,653.1 1114.5,0.0 6608.0,0.0 6608.0,5607.0 5812.1,5604.8 5806.2,6575.0 4977.4,6566.8 4977.7,7680.0 1182.7,7680.0 1181.8,7504.5 -0.0,7503.6 -0.0,3512.2 741.8,3512.8 738.6,6558.2 1176.4,6559.7 1150.5,1971.9 -0.0,1978.4 -0.0,1230.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0231/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45001058539545,40.59303387813413]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44216039750094,40.59359105578624]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44131362243974,40.586613745236804]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44916381033424,40.58605656758469]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0232/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p232","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0232/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0232/info.json","type":"ImageService2","height":7680,"width":6632},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6632.0,7680.0 -0.0,7680.0 -0.0,6528.7 830.5,6537.2 836.7,5565.0 1634.2,5567.5 1636.0,0.0 6632.0,0.0 6632.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0232/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44409441032538,40.59340693127943]}},{"type":"Feature","properties":{"resourceCoords":[6632.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43623162506086,40.59396693318249]}},{"type":"Feature","properties":{"resourceCoords":[6632.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43538363271959,40.58700375685251]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44324641798411,40.58644375494945]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__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 | 1950 | sanborn07494_006 p233 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4642.8"},{"label":"split_canvas_w","value":"6584.0"},{"label":"split_canvas_h","value":"3037.2"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233/info.json","type":"ImageService2","height":7680,"width":6584},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6584.0,7680.0 6584.0,5378.4 5827.2,5321.2 5553.6,4924.0 3256.0,4642.8 1296.2,4656.5 1325.4,5572.9 452.5,5590.4 474.0,6844.8 1320.1,6830.8 1351.5,7680.0 6584.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5260.0,6844.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.424817,40.591746]}},{"type":"Feature","properties":{"resourceCoords":[472.0,6844.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4304718,40.5914659]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__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 | 1950 | sanborn07494_006 p233 [2]","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"19"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6584.0"},{"label":"split_canvas_h","value":"5378.4"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233/info.json","type":"ImageService2","height":7680,"width":6584},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1148.9,0.0 1126.8,4657.7 3256.0,4642.8 5553.6,4924.0 5827.2,5321.2 6584.0,5378.4 6538.9,2881.2 5697.5,2868.4 5683.9,2810.1 5715.8,1620.2 6584.0,1651.0 6584.0,0.0 1148.9,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0233__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2120.0,3167.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434677,40.590884]}},{"type":"Feature","properties":{"resourceCoords":[2120.0,4294.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434547,40.589869]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0234__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 | 1950 | sanborn07494_006 p234 [1]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"13"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6632.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0234__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0234/info.json","type":"ImageService2","height":7680,"width":6632},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3927.6 1322.5,3923.4 1396.6,7680.0 1536.0,7680.0 5227.6,7680.0 6632.0,5978.8 6632.0,796.1 5325.2,807.4 5307.7,0.0 3416.2,0.0 2302.5,573.0 1874.8,701.0 716.3,681.0 705.8,160.2 226.7,168.6 221.6,0.0 0.0,-0.0 -0.0,3927.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0234__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,7320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434425,40.612433]}},{"type":"Feature","properties":{"resourceCoords":[548.0,4640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434759,40.61486]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0235/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p235","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0235/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0235/info.json","type":"ImageService2","height":7680,"width":6584},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5455.2,0.0 5412.3,3105.2 5042.6,3095.6 5042.3,4491.5 5393.5,4498.8 5381.0,5428.7 6521.2,5426.8 6516.7,5898.6 6584.0,5900.3 6584.0,7680.0 -0.0,7680.0 -0.0,-0.0 5455.2,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0235/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45556408414122,40.603989008336065]}},{"type":"Feature","properties":{"resourceCoords":[6584.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44927447951586,40.6075032805499]}},{"type":"Feature","properties":{"resourceCoords":[6584.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44391311556613,40.60189375345041]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45020272019148,40.59837948123658]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0236/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p236","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"22"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0236/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0236/info.json","type":"ImageService2","height":7680,"width":6636},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3056.0 362.0,3063.0 391.2,851.2 1582.9,865.5 1589.0,463.1 6471.1,455.9 6478.9,0.0 6636.0,0.0 6636.0,7680.0 -0.0,7680.0 -0.0,7554.5 1510.3,7544.1 1509.9,5797.8 1444.0,5796.5 1448.3,5333.6 331.8,5343.1 343.9,4430.5 -0.0,4425.8 -0.0,3056.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0236/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4328.0,2616.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4446552,40.6070843]}},{"type":"Feature","properties":{"resourceCoords":[356.0,3512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4479126,40.6042723]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0237/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p237","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0237/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0237/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2221.2,4978.1 1902.3,5004.3 1598.7,5178.4 1475.5,5379.8 1394.9,5748.7 480.9,5526.7 -0.0,5315.2 -0.0,1472.7 285.3,906.3 1035.8,0.0 6576.0,0.0 6576.0,7264.4 4317.0,7282.3 4315.8,7680.0 3137.9,7680.0 3140.0,6854.2 -0.0,6913.3 -0.0,5448.2 1418.6,5826.7 1995.9,5807.6 2221.2,4978.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0237/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3144.0,5792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4511006,40.60771]}},{"type":"Feature","properties":{"resourceCoords":[5832.0,7280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4473591,40.6080254]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0238/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p238","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0238/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0238/info.json","type":"ImageService2","height":7680,"width":6680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1702.6,1876.4 1755.4,1570.5 1701.3,1562.9 1695.0,0.0 6680.0,0.0 6680.0,1625.2 6600.1,1779.6 6680.0,1821.0 6680.0,1994.3 5336.4,2272.8 5458.0,2824.0 6680.0,2563.1 6657.5,7301.9 6278.5,7175.8 6025.6,7680.0 5440.0,7680.0 5423.4,6185.2 4350.0,6040.2 4337.1,7274.6 1724.6,7316.0 1714.1,4732.6 1714.1,4732.6 1702.6,1876.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0238/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4533829391979,40.61300893153545]}},{"type":"Feature","properties":{"resourceCoords":[6680.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44683011811777,40.616545865837686]}},{"type":"Feature","properties":{"resourceCoords":[6680.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44151101149535,40.61078634807248]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44806383257547,40.60724941377024]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0239/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p239","metadata":[{"label":"streets","value":"21"},{"label":"intersections","value":"51"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0239/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0239/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4333.1 -0.0,3634.2 717.9,1007.3 1882.1,0.0 2488.2,0.0 2756.7,0.0 6616.0,1505.8 6616.0,7284.3 6616.0,7680.0 3119.9,7680.0 1477.4,7680.0 -0.0,4333.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0239/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5524.0,2748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4403896,40.6142758]}},{"type":"Feature","properties":{"resourceCoords":[4520.0,6696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.439755,40.610564]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p24","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"20"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0024/info.json","type":"ImageService2","height":7680,"width":6632},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6632.0,7085.3 4127.2,7091.3 4118.9,7680.0 823.4,7680.0 850.3,0.0 6632.0,0.0 6632.0,7085.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2152.0,5460.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4672311,40.6058559]}},{"type":"Feature","properties":{"resourceCoords":[5628.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4662605,40.6084892]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0240/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p240","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0240/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0240/info.json","type":"ImageService2","height":7680,"width":6668},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1559.4,3975.2 -0.0,4159.0 -0.0,3203.8 552.0,3204.7 556.4,2763.3 1078.7,2622.4 1045.0,1136.1 2570.0,1134.4 2510.6,708.6 3044.0,739.5 3708.0,467.0 3887.7,864.4 4356.4,674.0 5840.5,708.0 5841.2,846.1 6348.0,839.0 6347.1,0.0 6637.0,0.0 6668.0,7680.0 -0.0,7680.0 -0.0,5098.7 1544.9,4899.2 1532.6,5843.7 3450.1,5364.6 3343.0,4976.6 3067.8,5019.8 2882.3,3669.2 1559.4,3975.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0240/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44171752726346,40.6149078315682]}},{"type":"Feature","properties":{"resourceCoords":[6668.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43387967754327,40.615579589062456]}},{"type":"Feature","properties":{"resourceCoords":[6668.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4328676226809,40.60867819772463]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44070547240109,40.608006440230376]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0241/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p241","metadata":[{"label":"streets","value":"23"},{"label":"intersections","value":"60"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0241/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0241/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1992.3,5039.1 -0.0,5916.2 -0.0,-0.0 5343.1,22.1 5347.5,888.3 4416.9,889.8 4330.3,2355.7 5894.0,2493.8 5785.2,4529.0 6245.4,4454.8 6168.1,5455.5 6539.7,7595.4 6067.8,7680.0 5152.2,7680.0 5150.6,6880.6 4707.0,6873.4 4703.5,7680.0 3879.9,7680.0 3723.8,7446.1 3375.4,7680.0 3133.6,7680.0 3006.7,7386.4 3469.0,7068.7 3133.4,6615.9 3535.7,6360.6 3501.8,6310.5 2639.9,6463.1 2635.5,6527.5 1992.3,5039.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0241/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1788.0,5680.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.446915,40.61593]}},{"type":"Feature","properties":{"resourceCoords":[2460.0,2228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.446963,40.61916]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0242/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p242","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0242/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0242/info.json","type":"ImageService2","height":7680,"width":6672},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1356.4 383.1,1355.7 276.8,208.9 3485.2,196.6 3481.2,1350.1 4457.6,1348.3 4460.3,1958.7 5907.7,1943.1 5916.6,2602.9 5693.0,2598.9 5626.3,6535.1 6672.0,6554.8 6672.0,7390.0 6167.6,7396.5 6167.1,7259.0 4690.0,7223.6 4223.3,7412.7 4044.8,7016.9 3383.7,7287.4 2852.8,7256.1 2911.4,7680.0 1393.6,7680.0 1386.8,7365.1 1865.0,7238.2 1671.6,6549.5 702.5,6548.4 1128.7,6432.7 553.2,4312.6 538.5,3298.3 79.0,3414.7 -0.0,1356.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0242/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44301178642195,40.620782288311055]}},{"type":"Feature","properties":{"resourceCoords":[6672.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43513319927935,40.6214641075111]}},{"type":"Feature","properties":{"resourceCoords":[6672.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43410651171855,40.614531611403834]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44198509886115,40.61384979220379]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0243/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p243","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0243/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0243/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,6209.8 -0.0,-0.0 6576.0,0.0 6576.0,4714.7 6527.1,7680.0 45.4,7680.0 -0.0,6209.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0243/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44582318554653,40.62638084927221]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43798894210826,40.6270698105326]}},{"type":"Feature","properties":{"resourceCoords":[6576.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43693626700487,40.620076282105636]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.44477051044313,40.61938732084524]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__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 | 1950 | sanborn07494_006 p244 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5881.6"},{"label":"split_canvas_w","value":"2798.4"},{"label":"split_canvas_h","value":"1798.4"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244/info.json","type":"ImageService2","height":7680,"width":6680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,7680.0 2761.6,7680.0 2798.4,5968.8 0.0,5881.6 0.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1591.1,7408.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.445811,40.623576]}},{"type":"Feature","properties":{"resourceCoords":[2618.5,7408.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.444617,40.623577]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__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 | 1950 | sanborn07494_006 p244 [2]","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"34"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6680.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244/info.json","type":"ImageService2","height":7680,"width":6680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1681.8,2280.2 1669.8,5221.8 1195.7,5218.9 1192.6,5819.1 2606.0,5815.0 2606.6,5962.8 2798.4,5968.8 2784.1,6631.6 3081.2,6634.2 3077.9,7156.1 3938.6,7225.2 4400.2,7159.4 5754.7,6546.6 6680.0,6570.9 6680.0,1257.4 5805.3,1258.1 5805.5,821.9 6680.0,813.0 6680.0,301.2 5812.2,299.3 5814.0,0.0 1211.4,0.0 1209.5,297.8 -0.0,293.5 -0.0,835.2 274.8,835.8 270.0,1837.4 730.7,1833.6 730.7,836.9 1691.2,820.1 1677.4,1834.7 1744.2,1834.9 1740.8,2280.2 1681.8,2280.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0244__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5812.0,3128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.432299,40.622455]}},{"type":"Feature","properties":{"resourceCoords":[3564.0,5812.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434619,40.619742]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0245/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p245","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0245/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0245/info.json","type":"ImageService2","height":7680,"width":6608},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"505.2,718.8 1372.7,725.1 1373.5,201.1 4902.5,213.7 4897.7,507.3 6608.0,537.5 6608.0,3536.5 6063.2,3654.7 6131.9,4323.1 6067.6,4338.6 5874.0,7463.9 4902.8,7516.9 4906.8,7680.0 3647.1,7680.0 3652.3,7491.7 2325.3,7464.2 2330.3,6649.2 1363.7,6620.9 1372.0,1180.2 470.2,1177.9 505.2,718.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0245/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43330562528564,40.62517130042228]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.42556484798567,40.6259080594939]}},{"type":"Feature","properties":{"resourceCoords":[6608.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.42444461183125,40.6190313155831]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.43218538913122,40.61829455651148]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0246/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p246","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"32"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0246/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0246/info.json","type":"ImageService2","height":7680,"width":6680},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1232.7,3658.2 1784.6,3551.1 1843.6,594.4 3686.6,670.0 3697.2,338.3 4600.6,363.4 4592.9,707.3 5032.8,725.3 5049.8,376.2 5728.9,384.8 5707.6,753.0 6680.0,793.0 6680.0,7680.0 -0.0,7680.0 -0.0,7443.3 953.6,7413.1 1220.3,4333.3 1283.7,4319.5 1232.7,3658.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0246/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3052.0,824.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.424007,40.625382]}},{"type":"Feature","properties":{"resourceCoords":[1252.0,4328.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4255285,40.6219735]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__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 | 1950 | sanborn07494_006 p247 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6624.0"},{"label":"split_canvas_h","value":"2030.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247/info.json","type":"ImageService2","height":7680,"width":6624},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"956.5,1493.7 5693.2,1453.2 5683.6,-0.0 941.6,0.0 952.5,821.8 459.3,825.3 450.9,0.0 -0.0,0.0 0.0,1260.6 956.0,1285.8 956.5,1493.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3912.0,1266.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.434876,40.62531]}},{"type":"Feature","properties":{"resourceCoords":[956.0,1266.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4383495,40.625011]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__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 | 1950 | sanborn07494_006 p247 [2]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"15"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2022.0"},{"label":"split_canvas_w","value":"6624.0"},{"label":"split_canvas_h","value":"3644.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247/info.json","type":"ImageService2","height":7680,"width":6624},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4932.8,4977.1 6004.8,4970.4 6002.1,4526.1 6624.0,4521.0 6624.0,2030.0 0.0,2022.0 -0.0,3751.7 604.5,3753.1 609.0,4535.8 610.8,5476.6 4928.9,5452.7 4932.8,4977.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4564.0,4078.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.428161,40.626742]}},{"type":"Feature","properties":{"resourceCoords":[596.0,2298.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4331756,40.627947]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__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 | 1950 | sanborn07494_006 p247 [3]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5655.2"},{"label":"split_canvas_w","value":"6624.0"},{"label":"split_canvas_h","value":"2024.8"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__3/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247/info.json","type":"ImageService2","height":7680,"width":6624},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3535.8,7680.0 3532.8,7347.4 4440.0,7335.4 4446.3,7680.0 4888.3,7680.0 4891.0,7329.7 5572.4,7310.4 5566.2,7680.0 6624.0,7680.0 6624.0,5655.2 1695.5,5663.2 1701.9,6437.3 1074.7,6447.6 1081.1,6894.9 0.0,6910.7 0.0,7680.0 3535.8,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0247__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3528.0,6869.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.423392,40.626341]}},{"type":"Feature","properties":{"resourceCoords":[1068.0,5994.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.426437,40.626895]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0248/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p248","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"19"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0248/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0248/info.json","type":"ImageService2","height":7680,"width":6560},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7680.0 -0.0,-0.0 6560.0,0.0 6560.0,5369.5 6509.4,5309.6 5742.1,5939.9 6560.0,6918.8 6560.0,7680.0 -0.0,7680.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0248/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5100.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.510687,40.62047]}},{"type":"Feature","properties":{"resourceCoords":[468.0,5332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.514425,40.615826]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p25","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"28"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0025/info.json","type":"ImageService2","height":7680,"width":6592},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6150.8,1361.3 6066.0,6966.8 -0.0,6924.2 -0.0,1303.2 6150.8,1361.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2728.0,3912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4756324,40.6105072]}},{"type":"Feature","properties":{"resourceCoords":[260.0,6924.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4763942,40.6088227]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p26","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"29"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0026/info.json","type":"ImageService2","height":7680,"width":6632},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5837.1,557.5 5880.2,1275.8 5898.8,6431.0 770.4,6440.0 760.1,581.6 5837.1,557.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3340.0,7032.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.473209,40.606581]}},{"type":"Feature","properties":{"resourceCoords":[5884.0,3776.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4724326,40.608361]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0027/info.json","type":"ImageService2","height":7680,"width":6592},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7043.6 -0.0,547.9 529.5,552.4 532.0,0.0 6120.6,0.0 6064.5,7680.0 465.5,7680.0 474.3,7047.8 -0.0,7043.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49595976104189,40.603728607561465]}},{"type":"Feature","properties":{"resourceCoords":[6592.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49226417149072,40.60477689904936]}},{"type":"Feature","properties":{"resourceCoords":[6592.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49066684978082,40.60148488683299]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.494362439332,40.600436595345094]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p28","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"28"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0028/info.json","type":"ImageService2","height":7680,"width":6620},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1585.6,0.0 6620.0,0.0 6620.0,718.2 6620.0,1676.1 6620.0,2995.6 5213.6,2960.7 5119.1,7680.0 1418.1,7680.0 1585.6,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2408.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4917243,40.6041673]}},{"type":"Feature","properties":{"resourceCoords":[1480.0,4812.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.491545,40.602628]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p29","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"35"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0029/info.json","type":"ImageService2","height":7680,"width":6592},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"494.8,2836.3 1916.6,2851.1 1875.5,0.0 6099.9,0.0 6054.3,7068.2 472.4,7065.9 494.8,2836.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3300.0,6096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4875823,40.6030896]}},{"type":"Feature","properties":{"resourceCoords":[6096.0,576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.487154,40.605888]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p3","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0003/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7335.4 -0.0,645.2 4160.0,612.0 4152.9,0.0 5022.4,0.0 5026.7,593.3 5833.7,576.1 5807.9,5999.3 6688.0,6894.8 6688.0,7293.8 6306.2,7680.0 518.7,7680.0 427.4,7328.9 -0.0,7335.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5832.0,3872.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.465612,40.6006803]}},{"type":"Feature","properties":{"resourceCoords":[4160.0,612.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4672173,40.6018377]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p30","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0030/info.json","type":"ImageService2","height":7680,"width":6596},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1473.9,0.0 6596.0,0.0 6596.0,6535.9 1472.9,6570.7 1473.9,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1468.0,6100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4860273,40.6035139]}},{"type":"Feature","properties":{"resourceCoords":[1468.0,2844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.486691,40.604908]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p31","metadata":[{"label":"streets","value":"20"},{"label":"intersections","value":"51"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0031/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0031/info.json","type":"ImageService2","height":7680,"width":6544},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1433.0,7101.5 476.5,7095.1 483.4,6423.9 21.4,6420.5 -0.0,529.8 990.0,532.2 986.3,849.3 5389.9,821.4 5384.1,6459.4 1436.8,6430.8 1433.0,7101.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3780.0,1020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4908841,40.6012394]}},{"type":"Feature","properties":{"resourceCoords":[5648.0,1020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4887799,40.6018243]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p32","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"40"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0032/info.json","type":"ImageService2","height":7680,"width":6600},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1522.7,1968.5 1513.4,1246.0 123.5,1258.2 109.9,0.0 570.7,0.0 568.7,669.5 680.8,669.6 1522.6,669.0 1521.5,0.0 5462.0,0.0 5462.4,653.7 5694.8,652.6 5694.1,927.4 6600.0,922.0 6600.0,7680.0 1596.0,7680.0 1535.0,3284.7 1051.5,3287.3 1049.2,1971.9 1522.7,1968.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3840.0,3272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4873408,40.593778]}},{"type":"Feature","properties":{"resourceCoords":[3840.0,4596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4868042,40.5926396]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p33","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"30"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0033/info.json","type":"ImageService2","height":7680,"width":6520},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1358.5,1074.4 6063.9,1095.3 6064.9,2131.8 6520.0,2134.5 6520.0,2548.3 6198.2,2692.0 6520.0,2623.5 6520.0,7680.0 1296.7,7680.0 1358.5,1074.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[6060.0,1568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4796844,40.5977042]}},{"type":"Feature","properties":{"resourceCoords":[2308.0,2108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.483674,40.596065]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0034__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 | 1950 | sanborn07494_006 p34 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6636.0"},{"label":"split_canvas_h","value":"4169.6"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0034__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0034/info.json","type":"ImageService2","height":7680,"width":6636},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"985.5,1847.3 1436.5,1846.3 1439.7,2243.0 1122.1,2401.7 1440.5,2331.1 1455.5,4163.4 5173.1,4147.5 5170.7,1991.8 5459.4,1881.3 5558.3,1721.3 5575.1,1512.3 5124.8,1336.1 5169.5,833.2 976.0,827.0 985.5,1847.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0034__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[976.0,1288.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4796844,40.5977042]}},{"type":"Feature","properties":{"resourceCoords":[976.0,544.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4799881,40.5983462]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p35","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0035/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0035/info.json","type":"ImageService2","height":7680,"width":6520},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2587.4,0.0 2590.8,263.9 2288.4,268.5 2290.0,741.4 5106.3,721.9 5145.8,3792.7 5657.3,3788.5 5664.6,6717.8 -0.0,6729.4 -0.0,-0.0 2587.4,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2088.0,2284.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4806442,40.6091429]}},{"type":"Feature","properties":{"resourceCoords":[4856.0,6192.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4758947,40.6066135]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0036/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0036/info.json","type":"ImageService2","height":7680,"width":6616},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5285.0,0.0 5271.6,4039.3 5743.6,4042.9 5758.6,6719.6 884.9,6699.8 860.9,739.4 1337.7,743.0 1338.7,0.0 5285.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47562156039837,40.61276014092275]}},{"type":"Feature","properties":{"resourceCoords":[6616.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46814425950355,40.614816052221684]}},{"type":"Feature","properties":{"resourceCoords":[6616.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46502258489537,40.60818025592138]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47249988579019,40.60612434462245]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0037/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0037/info.json","type":"ImageService2","height":7680,"width":6520},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"618.0,3451.2 648.9,763.8 3513.0,826.6 3515.2,576.6 5699.7,613.1 5643.7,5455.8 6243.8,5463.5 6235.9,6253.2 5398.1,6245.5 5393.1,6792.7 4526.5,6786.2 4524.2,7045.4 1089.0,7003.0 1125.0,3458.5 618.0,3451.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46852863885617,40.61149847985851]}},{"type":"Feature","properties":{"resourceCoords":[6520.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46122828102637,40.613596470211796]}},{"type":"Feature","properties":{"resourceCoords":[6520.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45799586993162,40.607022188732614]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46529622776143,40.60492419837933]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0038/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0038/info.json","type":"ImageService2","height":7680,"width":6628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1050.6,5072.9 1051.8,4534.8 1314.7,559.6 3700.5,589.1 4380.4,630.9 6628.0,854.6 6628.0,1185.7 6628.0,7535.6 6121.4,7680.0 2168.0,7680.0 1050.6,5072.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46296191032619,40.61150958385837]}},{"type":"Feature","properties":{"resourceCoords":[6628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45539471260501,40.61363853215428]}},{"type":"Feature","properties":{"resourceCoords":[6628.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45216805307098,40.60693498769781]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45973525079215,40.6048060394019]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0039/info.json","type":"ImageService2","height":7680,"width":6492},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3747.9,3668.5 3759.7,2654.9 4555.8,2505.5 4573.6,440.8 1451.4,422.1 1452.1,0.0 5894.3,0.0 6492.0,373.8 6492.0,6887.5 4518.2,6868.7 4545.8,3669.3 3747.9,3668.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49957434959245,40.60945547247474]}},{"type":"Feature","properties":{"resourceCoords":[6492.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4922673920215,40.611498373217024]}},{"type":"Feature","properties":{"resourceCoords":[6492.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48910638182558,40.604889561595435]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49641333939653,40.60284666085315]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p4","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"13"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0004/info.json","type":"ImageService2","height":7680,"width":6664},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7353.4 827.4,7356.0 1397.8,6782.6 343.8,5705.2 386.4,383.8 3000.0,336.0 2998.8,0.0 3489.4,0.0 3485.4,543.0 6664.0,552.8 6664.0,7680.0 -0.0,7680.0 -0.0,7353.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3000.0,336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4647629,40.6025366]}},{"type":"Feature","properties":{"resourceCoords":[384.0,1604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4660206,40.6015693]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0040__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 | 1950 | sanborn07494_006 p40 [1]","metadata":[{"label":"streets","value":"25"},{"label":"intersections","value":"72"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6628.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0040__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0040/info.json","type":"ImageService2","height":7680,"width":6628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"934.3,0.0 1549.4,375.6 1614.0,6921.8 5270.8,6924.4 5210.8,6630.0 5062.4,5903.2 5013.6,5904.4 5146.8,4636.4 5161.6,4494.8 5215.2,5599.6 5207.2,5722.0 5221.2,5724.8 5581.6,5790.4 5991.6,5865.2 5998.8,5866.8 6081.2,5881.6 6166.4,5865.2 6168.0,5880.8 6628.0,5875.6 6628.0,5814.0 6628.0,4121.6 6628.0,0.0 934.3,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0040__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5836.0,2748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4863175,40.6104349]}},{"type":"Feature","properties":{"resourceCoords":[1620.0,2068.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.491359,40.609743]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p41","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"3"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0041/info.json","type":"ImageService2","height":7680,"width":6492},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.4,5247.7 109.0,4156.5 564.5,4152.7 557.3,3423.2 -0.0,3427.6 -0.0,421.4 1017.2,414.2 1016.3,0.0 3362.2,0.0 3364.9,387.5 6492.0,364.9 6492.0,2444.7 5696.0,2605.6 5692.9,3626.6 6492.0,3616.8 6492.0,6839.1 4780.4,6889.1 4781.6,7182.7 118.3,7226.1 112.3,6209.1 -0.0,6210.1 -0.0,5249.1 109.4,5247.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3832.0,4116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4957518,40.6064948]}},{"type":"Feature","properties":{"resourceCoords":[3832.0,2256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.496494,40.608089]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p42","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"39"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0042/info.json","type":"ImageService2","height":7680,"width":6628},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 6628.0,0.0 6628.0,6656.7 6385.9,6657.0 6382.6,7401.6 5907.2,7401.6 5905.6,7680.0 2832.4,7680.0 2829.8,7407.4 -0.0,7412.7 -0.0,6937.7 303.8,6934.1 301.4,6669.0 -0.0,6667.9 0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4228.0,4624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4773877,40.6142564]}},{"type":"Feature","properties":{"resourceCoords":[2548.0,3688.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.479676,40.6145405]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p44","metadata":[{"label":"streets","value":"22"},{"label":"intersections","value":"43"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0044/info.json","type":"ImageService2","height":7680,"width":6596},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6596.0,2386.0 6088.1,2505.8 6063.0,2664.9 6137.4,2726.3 6101.9,3289.9 6583.4,3296.0 6575.9,3814.5 6104.4,3829.3 6131.3,7410.7 3348.4,7428.2 3350.5,7680.0 -0.0,7680.0 -0.0,-0.0 6596.0,0.0 6596.0,2386.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1260.0,3412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.468302,40.61494]}},{"type":"Feature","properties":{"resourceCoords":[6120.0,5908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4618329,40.6142744]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0045/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0045/info.json","type":"ImageService2","height":7680,"width":6536},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5074.3 -0.0,-0.0 6536.0,0.0 6536.0,7680.0 6439.1,7680.0 6263.4,5988.4 1403.3,6493.7 1245.8,4952.3 -0.0,5074.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46651591192794,40.62361463838567]}},{"type":"Feature","properties":{"resourceCoords":[6536.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45889385772101,40.625040901236865]}},{"type":"Feature","properties":{"resourceCoords":[6536.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45670137676811,40.618194944857876]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46432343097504,40.61676868200668]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0046/info.json","type":"ImageService2","height":7680,"width":6644},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"645.8,5828.8 1241.5,5826.5 1220.8,2254.3 1693.5,2242.4 1702.0,1725.3 1219.2,1716.3 1255.8,1154.3 1181.3,1092.7 1206.7,934.1 1716.2,817.8 1717.6,0.0 6644.0,0.0 6644.0,7680.0 3941.2,7680.0 3797.6,7472.1 3102.6,7435.7 3098.1,7680.0 2283.8,7680.0 2288.2,7433.2 665.0,7427.5 645.8,5828.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46495145933649,40.61760551288477]}},{"type":"Feature","properties":{"resourceCoords":[6644.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45750223674742,40.61964331665193]}},{"type":"Feature","properties":{"resourceCoords":[6644.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45442087347743,40.61306077518909]}},{"type":"Feature","properties":{"resourceCoords":[0.0,7680.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4618700960665,40.61102297142193]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p5","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"20"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0005/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7123.7 35.7,440.5 6121.6,439.1 6094.4,7680.0 465.1,7680.0 469.9,7124.4 -0.0,7123.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[6112.0,2644.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.484062,40.599375]}},{"type":"Feature","properties":{"resourceCoords":[2368.0,3784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.485922,40.598312]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p6","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"39"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0006/info.json","type":"ImageService2","height":7680,"width":6640},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"599.8,495.1 5337.3,468.1 5336.2,3792.6 6241.8,3797.9 6221.6,7680.0 592.4,7680.0 599.8,495.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[5300.0,1452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4816634,40.6006297]}},{"type":"Feature","properties":{"resourceCoords":[592.0,2120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4841794,40.5996158]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p7","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"24"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0007/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3808.1 -0.0,508.7 5723.9,495.3 5743.5,7103.9 5882.9,7418.3 6688.0,7680.0 5740.6,7680.0 879.8,7680.0 898.7,3813.0 -0.0,3808.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4004.0,5508.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4785447,40.599525]}},{"type":"Feature","properties":{"resourceCoords":[876.0,5508.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4803203,40.5990379]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p8","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"19"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0008/info.json","type":"ImageService2","height":7680,"width":6576},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4628.2,1189.0 4610.6,7680.0 1858.9,7680.0 1264.5,7437.5 1128.4,6971.7 1160.0,1122.2 4628.2,1189.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3860.0,5536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4760109,40.6002313]}},{"type":"Feature","properties":{"resourceCoords":[1128.0,5536.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4775652,40.5997937]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1950 | sanborn07494_006 p9","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"23"}],"created":"2026-09-21T12:30:21Z","modified":"2026-09-21T12:30:21Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0009/info.json","type":"ImageService2","height":7680,"width":6688},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5780.1,7103.1 5779.7,7680.0 -0.0,7660.6 -0.0,495.0 5094.0,523.7 4991.3,7096.8 5780.1,7103.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941950:07494_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[840.0,2104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4758009,40.6019279]}},{"type":"Feature","properties":{"resourceCoords":[5816.0,528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.473299,40.6033995]}}]}}]}