{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn07493_001.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Allegheny, Pennsylvania | 1893 | key map | mapsnap generated fit (2026-09-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-20"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074931893:07493_1893-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allegheny, Pennsylvania | 1893 | sanborn07493_001 p0","metadata":[{"label":"streets","value":"86"},{"label":"intersections","value":"59"}],"created":"2026-09-20T17:08:55Z","modified":"2026-09-20T17:08:55Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074931893:07493_1893-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074931893:07493_1893-0000/info.json","type":"ImageService2","height":8152,"width":6972},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,0.0 6972.0,0.0 6972.0,8152.0 0.0,8152.0 -0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g074931893:07493_1893-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2878.2,4258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-80.0165004,40.4623532]}},{"type":"Feature","properties":{"resourceCoords":[1587.7,3844.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-80.025805,40.4575542]}}]}}]}