{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn00489_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Covina, California | 1911 | 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:gmd436m:g4364m:g4364cm:g4364cm_g004891911:00489_1911-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Covina, California | 1911 | sanborn00489_003 p1 [2]","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"37"},{"label":"split_canvas_x","value":"4390.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2488.3"},{"label":"split_canvas_h","value":"4839.4"}],"created":"2026-10-19T23:28:43Z","modified":"2026-10-19T23:28:43Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004891911:00489_1911-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004891911:00489_1911-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,0.0 1107.3,0.0 1104.3,412.3 1097.5,1204.5 1613,1209.8 1613,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364cm:g4364cm_g004891911:00489_1911-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1408.3,714.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-117.8901442,34.086242]}},{"type":"Feature","properties":{"resourceCoords":[1290.9,714.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-117.890174,34.0884612]}}]}}]}