{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn01227_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Washington, District-Of-Columbia | 1916 | key map | 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"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd385m:g3851m:g3851gm:g01227003:sb00001b/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Washington, District-Of-Columbia | 1916 | sanborn01227_003 p1b","metadata":[{"label":"streets","value":"76"},{"label":"intersections","value":"254"}],"created":"2026-09-21T04:29:57Z","modified":"2026-09-21T04:29:57Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd385m:g3851m:g3851gm:g01227003:sb00001b/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd385m:g3851m:g3851gm:g01227003:sb00001b/info.json","type":"ImageService2","height":8424,"width":6092},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2555.7 -0.0,-0.0 6092.0,-0.0 6092.0,276.9 6092.0,8424.0 5694.1,8424.0 5450.1,8424.0 -0.0,8424.0 -0.0,2555.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd385m:g3851m:g3851gm:g01227003:sb00001b/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[759.1,2689.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.0296272,38.9048501]}},{"type":"Feature","properties":{"resourceCoords":[3742.6,5739.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.9855018,38.8867049]}}]}}]}