{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03573_046.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Baltimore, Maryland | 1952 | 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://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195209:03573_09_1952-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1952 | sanborn03573_046 p0","metadata":[{"label":"streets","value":"111"},{"label":"intersections","value":"240"}],"created":"2026-09-22T01:58:27Z","modified":"2026-09-22T01:58:27Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195209:03573_09_1952-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195209:03573_09_1952-0000/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5400.0 -0.0,-0.0 4352.0,0.0 4352.0,2475.1 4352.0,2873.4 4352.0,3163.3 4352.0,3527.7 4352.0,4550.5 4352.0,4872.8 4352.0,5400.0 -0.0,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195209:03573_09_1952-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1458.7,2622.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6767153,39.3418459]}},{"type":"Feature","properties":{"resourceCoords":[1195.5,4958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.679117,39.31399]}}]}}]}