{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn07807_004.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Mechanicsburg, Pennsylvania | 1902 | key map | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824mm:g3824mm_g078071902:07807_1902-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Mechanicsburg, Pennsylvania | 1902 | sanborn07807_004 p1","metadata":[{"label":"streets","value":"22"},{"label":"intersections","value":"108"}],"created":"2026-10-19T20:38:22Z","modified":"2026-10-19T20:38:22Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824mm:g3824mm_g078071902:07807_1902-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824mm:g3824mm_g078071902:07807_1902-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1913.0 0.0,0.0 1613.0,0.0 1613.0,1913.0 0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824mm:g3824mm_g078071902:07807_1902-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[605.7,799.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.007589,40.212383]}},{"type":"Feature","properties":{"resourceCoords":[605.7,620.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.008643,40.214468]}}]}}]}