{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn07625_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Downingtown, Pennsylvania | 1898 | 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:g3824dm:g3824dm_g076251898:07625_1898-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Downingtown, Pennsylvania | 1898 | sanborn07625_002 p1 [2]","metadata":[{"label":"streets","value":"23"},{"label":"intersections","value":"34"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6878.4"},{"label":"split_canvas_h","value":"5198.2"}],"created":"2026-09-22T05:31:49Z","modified":"2026-09-22T05:31:49Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824dm:g3824dm_g076251898:07625_1898-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824dm:g3824dm_g076251898:07625_1898-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,0.0 1569.2,0.0 1462.5,0.0 0.0,-0.0 0.0,1299.5 1070.6,1292.3 1069.8,1084.1 1613,1088.2 1613,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824dm:g3824dm_g076251898:07625_1898-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[696.9,1055.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.691463,40.006646]}},{"type":"Feature","properties":{"resourceCoords":[268.5,415.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.7115693,40.0011174]}}]}}]}