{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn07720_004.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Hollidaysburg, Pennsylvania | 1901 | 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:gmd382m:g3824m:g3824hm:g07720004:sb000010__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Hollidaysburg, Pennsylvania | 1901 | sanborn07720_004 p1 [2]","metadata":[{"label":"streets","value":"22"},{"label":"intersections","value":"58"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"9143.2"},{"label":"split_canvas_h","value":"5072.8"}],"created":"2026-09-22T20:44:27Z","modified":"2026-09-22T20:44:27Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824hm:g07720004:sb000010__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824hm:g07720004:sb000010","type":"ImageService3","width":2181,"height":2582},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2181,0.0 -0.0,-0.0 0.0,1252.8 2181,1268.2 2181,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd382m:g3824m:g3824hm:g07720004:sb000010__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[738.1,306.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.3951665,40.4321628]}},{"type":"Feature","properties":{"resourceCoords":[696.4,573.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-78.394521,40.4290196]}}]}}]}