{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn04023_009.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Grand Rapids, Michigan | 1913 | key map | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023191303:04023_03_1913-0000__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1913 | sanborn04023_009 p0 [1]","metadata":[{"label":"streets","value":"198"},{"label":"intersections","value":"791"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6986.0"},{"label":"split_canvas_h","value":"8217.7"}],"created":"2026-09-21T08:17:41Z","modified":"2026-09-21T08:17:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023191303:04023_03_1913-0000__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023191303:04023_03_1913-0000","type":"ImageService3","width":1640,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1640,-0.0 -0.0,-0.0 -0.0,104.2 -0.0,189.6 -0.0,302.3 -0.0,884.5 -0.0,1189.7 0.0,1949 1095.8,1949 1095.8,1326.0 1640,1320.7 1640,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023191303:04023_03_1913-0000__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[842.4,139.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.642477,42.962756]}},{"type":"Feature","properties":{"resourceCoords":[199.4,1464.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.665309,42.925539]}}]}}]}