{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/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 (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__3/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 [3]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"19"},{"label":"split_canvas_x","value":"3449.9"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3428.6"},{"label":"split_canvas_h","value":"4855.9"}],"created":"2026-10-19T11:47:18Z","modified":"2026-10-19T11:47:18Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,0.0 862.5,0.0 862.5,1214.0 1613,1214.0 1613,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd425m:g4254m:g4254fm:g4254fm_g049911939:04991_1939-0001__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1089.2,274.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-110.6757417,47.8080667]}},{"type":"Feature","properties":{"resourceCoords":[952.1,274.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-110.6803074,47.8103061]}}]}}]}