{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/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://tile.loc.gov/image-services/iiif/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://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/info.json","type":"ImageService2","height":7796,"width":6544},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7796.0 -0.0,-0.0 16.3,-0.0 221.4,-0.0 866.2,0.0 946.5,0.0 946.5,0.0 1041.2,0.0 1508.9,0.0 6544.0,0.0 6544.0,7796.0 -0.0,7796.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd411m:g4114m:g4114dm:g03985195107A:03985_07a_1951-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1021.5,2172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.061157,42.411566]}},{"type":"Feature","properties":{"resourceCoords":[3080.4,6977.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.012879,42.381558]}}]}}]}