{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn04218_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Trenton, Michigan | 1922 | key map | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114tm:g042181922:04218_1922-0001__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Trenton, Michigan | 1922 | sanborn04218_003 p1 [3]","metadata":[{"label":"streets","value":"27"},{"label":"intersections","value":"35"},{"label":"split_canvas_x","value":"3159.3"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3778.9"},{"label":"split_canvas_h","value":"8129.9"}],"created":"2026-10-19T02:24:05Z","modified":"2026-10-19T02:24:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114tm:g042181922:04218_1922-0001__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114tm:g042181922:04218_1922-0001","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1628,0.0 851.4,0.0 789.8,1244.5 893.0,1329.5 858.9,1927 1628,1927 1628,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114tm:g042181922:04218_1922-0001__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1142.7,353.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.175921,42.165753]}},{"type":"Feature","properties":{"resourceCoords":[1002.9,1003.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.1797438,42.1451381]}}]}}]}