{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03985_049.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1949 | 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194911:03985_11_1949-0000__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_049 p0 [1]","metadata":[{"label":"streets","value":"66"},{"label":"intersections","value":"280"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6926.2"},{"label":"split_canvas_h","value":"8217.7"}],"created":"2026-09-21T12:38:29Z","modified":"2026-09-21T12:38:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194911:03985_11_1949-0000__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194911:03985_11_1949-0000","type":"ImageService3","width":1625,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"732.6,0.0 735.4,465.9 616.1,595.1 0.0,590.2 0.0,1949 1625,1949 1625,589.9 1246.7,584.9 1181.2,470.1 1181.2,0.0 732.6,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194911:03985_11_1949-0000__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1345.4,1161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-82.94632,42.3720708]}},{"type":"Feature","properties":{"resourceCoords":[721.5,929.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-82.9702461,42.3701576]}}]}}]}