{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn08417_004.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Ballinger, Texas | 1915 | 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:gmd403m:g4034m:g4034bm:g08417004:sb00001k__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Ballinger, Texas | 1915 | sanborn08417_004 p1k [1]","metadata":[{"label":"streets","value":"30"},{"label":"intersections","value":"120"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6997.9"},{"label":"split_canvas_h","value":"5462.7"}],"created":"2026-10-19T14:04:36Z","modified":"2026-10-19T14:04:36Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034bm:g08417004:sb00001k__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034bm:g08417004:sb00001k","type":"ImageService3","width":1643,"height":1939},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1643,0.0 0.0,0.0 0.0,1062.3 661.6,1062.3 1292.9,1062.3 1298.3,1365.7 1643,1362.4 1643,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034bm:g08417004:sb00001k__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[469.1,757.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-99.9602131,31.7410076]}},{"type":"Feature","properties":{"resourceCoords":[770.4,581.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-99.9470677,31.7413634]}}]}}]}