{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn08247_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Madison, South-Dakota | 1921 | 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:g4184mm:g082471921:08247_1921-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Madison, South-Dakota | 1921 | sanborn08247_006 p1","metadata":[{"label":"streets","value":"30"},{"label":"intersections","value":"198"}],"created":"2026-09-23T08:03:09Z","modified":"2026-09-23T08:03:09Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184mm:g082471921:08247_1921-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184mm:g082471921:08247_1921-0001/info.json","type":"ImageService2","height":7708,"width":6512},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7708.0 -0.0,-0.0 6512.0,0.0 6512.0,7708.0 -0.0,7708.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd418m:g4184m:g4184mm:g082471921:08247_1921-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[778.2,2761.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-97.1270551,44.006063]}},{"type":"Feature","properties":{"resourceCoords":[4315.3,2379.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-97.1040517,44.0078275]}}]}}]}