{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn09056_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Petersburg, Virginia | 1915 | 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:g3884pm:g3884pm_g090561915:09056_1915-0000__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Petersburg, Virginia | 1915 | sanborn09056_006 p0 [1]","metadata":[{"label":"streets","value":"116"},{"label":"intersections","value":"228"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"7053.7"},{"label":"split_canvas_h","value":"8217.7"}],"created":"2026-09-22T00:08:56Z","modified":"2026-09-22T00:08:56Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g090561915:09056_1915-0000__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g090561915:09056_1915-0000","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,0.0 0.0,1949 1185.1,1949 1190.5,1614.8 1406.8,1424.5 1657,1427.9 1657,544.5 1657,0.0 0.0,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g090561915:09056_1915-0000__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1064.7,961.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.4007416,37.2332736]}},{"type":"Feature","properties":{"resourceCoords":[956.1,1146.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.403325,37.227789]}}]}}]}