{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn04991_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Fort Benton, Montana | 1939 | key map | mapsnap generated fit (2026-09-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-20"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Fort Benton, Montana | 1939 | sanborn04991_006 p1 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"19"},{"label":"split_canvas_x","value":"3443.9"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3434.6"},{"label":"split_canvas_h","value":"4851.6"}],"created":"2026-09-20T23:05:30Z","modified":"2026-09-20T23:05:30Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3443.9,0.0 3443.9,2.9 3497.4,4848.2 6878.4,4851.6 6878.4,0.0 3443.9,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4357.3,1096.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-110.6757417,47.8080667]}},{"type":"Feature","properties":{"resourceCoords":[3809.2,1096.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-110.6803074,47.8103061]}}]}}]}