{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn08246_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Lead, 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd418m:g4184m:g4184lm:g082461909:08246_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":"Lead, South-Dakota | 1909 | sanborn08246_006 p1 [1]","metadata":[{"label":"streets","value":"21"},{"label":"intersections","value":"22"},{"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":"8129.9"}],"created":"2026-09-22T14:22:29Z","modified":"2026-09-22T14:22:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd418m:g4184m:g4184lm:g082461909:08246_1909-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd418m:g4184m:g4184lm:g082461909:08246_1909-0001","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1628,0.0 840.6,0.0 654.2,0.0 0.0,0.0 0.0,1927 1050.5,1927 1050.3,1540.9 1628,1540.9 1628,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd418m:g4184m:g4184lm:g082461909:08246_1909-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[538.8,874.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-103.7698678,44.3519236]}},{"type":"Feature","properties":{"resourceCoords":[270.7,988.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-103.7768267,44.3482808]}}]}}]}