{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03985_074.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1951 | 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1951 | sanborn03985_074 p0","metadata":[{"label":"streets","value":"187"},{"label":"intersections","value":"365"}],"created":"2026-09-22T06:40:04Z","modified":"2026-09-22T06:40:04Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1949.0 -0.0,-0.0 4.1,-0.0 55.4,-0.0 216.6,0.0 236.6,0.0 236.6,0.0 260.3,0.0 377.2,0.0 1636.0,0.0 1636.0,1949.0 -0.0,1949.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[255.4,543.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.061157,42.411566]}},{"type":"Feature","properties":{"resourceCoords":[770.1,1744.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.012879,42.381558]}}]}}]}