{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn08982_005.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Blackstone, Virginia | 1919 | 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:gmd388m:g3884m:g3884bm:g3884bm_g089821919:08982_1919-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Blackstone, Virginia | 1919 | sanborn08982_005 p1 [2]","metadata":[{"label":"streets","value":"21"},{"label":"intersections","value":"39"},{"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":"5047.7"}],"created":"2026-09-22T07:46:51Z","modified":"2026-09-22T07:46:51Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884bm:g3884bm_g089821919:08982_1919-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884bm:g3884bm_g089821919:08982_1919-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"6.3,1261.9 1613,1260.6 1613,0.0 1330.5,0.0 1206.8,0.0 1044.8,0.0 0.0,0.0 -0.0,1261.9 6.3,1261.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884bm:g3884bm_g089821919:08982_1919-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[868.3,313.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.993273,37.081976]}},{"type":"Feature","properties":{"resourceCoords":[664.4,424.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.9990165,37.0798748]}}]}}]}