{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn02571_005.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Audubon, Iowa | 1908 | 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:gmd415m:g4154m:g4154am:g025711908:02571_1908-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Audubon, Iowa | 1908 | sanborn02571_005 p1 [2]","metadata":[{"label":"streets","value":"17"},{"label":"intersections","value":"50"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6878.4"},{"label":"split_canvas_h","value":"8074.1"}],"created":"2026-09-22T17:08:00Z","modified":"2026-09-22T17:08:00Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154am:g025711908:02571_1908-0001__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154am:g025711908:02571_1908-0001/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6878.4,8074.1 6878.4,0.0 0.0,0.0 0.0,3547.9 4109.3,3547.9 4110.9,8074.1 6878.4,8074.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154am:g025711908:02571_1908-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1430.1,2003.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.931815,41.71933]}},{"type":"Feature","properties":{"resourceCoords":[2556.2,2315.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.926095,41.718312]}}]}}]}