{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03573_027.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Baltimore, Maryland | 1951 | 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:gmd384m:g3844m:g3844bm:g3844bm_g03573195105:03573_05_1951-0000__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1951 | sanborn03573_027 p0 [1]","metadata":[{"label":"streets","value":"119"},{"label":"intersections","value":"362"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6170.0"},{"label":"split_canvas_h","value":"8572.7"}],"created":"2026-09-21T19:12:08Z","modified":"2026-09-21T19:12:08Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195105:03573_05_1951-0000__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195105:03573_05_1951-0000/info.json","type":"ImageService2","height":8152,"width":5740},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2945.5,0.0 -0.0,-0.0 0.0,8572.7 4021.7,8572.7 4021.7,5981.0 4454.5,5467.4 6170.0,5473.8 6170.0,0.0 2945.5,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195105:03573_05_1951-0000__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[776.2,2686.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.570925,39.292992]}},{"type":"Feature","properties":{"resourceCoords":[3427.4,5809.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.5326786,39.2614468]}}]}}]}