{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03985_054.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1949 | 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:gmd411m:g4114m:g4114dm:g03985194907A:03985_07a_1949-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_054 p0","metadata":[{"label":"streets","value":"163"},{"label":"intersections","value":"268"}],"created":"2026-09-22T07:18:16Z","modified":"2026-09-22T07:18:16Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985194907A:03985_07a_1949-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985194907A:03985_07a_1949-0000/info.json","type":"ImageService2","height":7796,"width":6340},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7796.0 -0.0,-0.0 3088.3,-0.0 3372.0,-0.0 3668.6,-0.0 5009.7,-0.0 6340.0,-0.0 6340.0,1268.9 6340.0,1372.2 6340.0,1458.8 6340.0,1607.8 6340.0,1702.9 6340.0,3258.3 6340.0,3937.1 6340.0,3954.0 6340.0,4196.5 6340.0,7796.0 -0.0,7796.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985194907A:03985_07a_1949-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[128.0,2956.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.064561,42.402136]}},{"type":"Feature","properties":{"resourceCoords":[2280.7,2855.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.041645,42.411909]}}]}}]}