{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03573_023.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Baltimore, Maryland | 1950 | key map | mapsnap generated fit (2026-10-24)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-24"},{"label":"run","value":"corpus-v2.2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_023 p0a","metadata":[{"label":"streets","value":"161"},{"label":"intersections","value":"458"}],"created":"2026-10-24T14:59:35Z","modified":"2026-10-24T14:59:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000a","type":"ImageService3","width":1379,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1979.0 0.0,0.0 1379.0,0.0 1379.0,1979.0 0.0,1979.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000a/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1246.2,867.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6125509,39.2731985]}},{"type":"Feature","properties":{"resourceCoords":[1191.2,1052.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6148263,39.2662204]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000b/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Baltimore, Maryland | 1950 | sanborn03573_023 p0b","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"18"}],"created":"2026-10-24T14:59:35Z","modified":"2026-10-24T14:59:35Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000b/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000b","type":"ImageService3","width":1399,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1979.0 0.0,0.0 1399.0,0.0 1399.0,1979.0 0.0,1979.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844bm:g3844bm_g03573195001:03573_01_1950-0000b/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[717.1,1462.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6155151,39.2951028]}},{"type":"Feature","properties":{"resourceCoords":[577.3,1462.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.6440915,39.2939536]}}]}}]}