{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn08258_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Rapid City, South-Dakota | 1909 | 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:gmd418m:g4184m:g4184rm:g082581909:08258_1909-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Rapid City, South-Dakota | 1909 | sanborn08258_006 p1 [1]","metadata":[{"label":"streets","value":"25"},{"label":"intersections","value":"78"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6938.1"},{"label":"split_canvas_h","value":"3961.6"}],"created":"2026-09-22T21:50:57Z","modified":"2026-09-22T21:50:57Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184rm:g082581909:08258_1909-0001__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184rm:g082581909:08258_1909-0001/info.json","type":"ImageService2","height":7708,"width":6512},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1881.7,3961.6 6938.1,3961.6 6938.1,0.0 0.0,0.0 -0.0,3961.6 1881.7,3961.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184rm:g082581909:08258_1909-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3001.2,1876.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-103.2207466,44.0823636]}},{"type":"Feature","properties":{"resourceCoords":[2483.2,3344.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-103.2266408,44.0747668]}}]}}]}