{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn07494_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Allentown, Pennsylvania | 1897 | key map | mapsnap generated fit (2026-09-22)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-22"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941897:07494_1897-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1897 | sanborn07494_003 p0","metadata":[{"label":"streets","value":"71"},{"label":"intersections","value":"621"}],"created":"2026-09-22T04:53:56Z","modified":"2026-09-22T04:53:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941897:07494_1897-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941897:07494_1897-0000","type":"ImageService3","width":1696,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1696.0,1979.0 -0.0,1979.0 -0.0,-0.0 1696.0,-0.0 1696.0,1979.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074941897:07494_1897-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[614.7,1690.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.488709,40.599149]}},{"type":"Feature","properties":{"resourceCoords":[462.9,1932.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4952025,40.5978383]}}]}}]}