{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03985_041.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1929 | key map | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192911:03985_11_1929-0000__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 | 1929 | sanborn03985_041 p0 [1]","metadata":[{"label":"streets","value":"68"},{"label":"intersections","value":"274"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6874.5"},{"label":"split_canvas_h","value":"8217.7"}],"created":"2026-10-17T02:06:51Z","modified":"2026-10-17T02:06:51Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192911:03985_11_1929-0000__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192911:03985_11_1929-0000","type":"ImageService3","width":1612,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1612,0.0 682.9,0.0 682.9,506.2 682.9,602.1 505.9,601.0 0.0,598.2 0.0,1949 1612,1949 1612,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192911:03985_11_1929-0000__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1260.9,1153.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-82.9473305,42.371654]}},{"type":"Feature","properties":{"resourceCoords":[539.5,935.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-82.9745042,42.368471]}}]}}]}