{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn08242_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Huron, South-Dakota | 1887 | key map | mapsnap generated fit (2026-09-23)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-23"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184hm:g082421887:08242_1887-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Huron, South-Dakota | 1887 | sanborn08242_002 p1 [2]","metadata":[{"label":"streets","value":"22"},{"label":"intersections","value":"98"},{"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":"4259.6"}],"created":"2026-09-23T03:42:58Z","modified":"2026-09-23T03:42:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184hm:g082421887:08242_1887-0001__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184hm:g082421887:08242_1887-0001/info.json","type":"ImageService2","height":7708,"width":6512},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6938.1,0.0 6405.8,0.0 6006.2,0.0 3358.3,0.0 2382.3,0.0 0.0,0.0 -0.0,553.0 0.0,4208.5 6938.1,4259.6 6938.1,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184hm:g082421887:08242_1887-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2337.2,3388.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-98.215903,44.3608544]}},{"type":"Feature","properties":{"resourceCoords":[4793.8,3721.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-98.204506,44.3596594]}}]}}]}