{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn00727_018.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Oakland, California | 1950 | key map | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364om:g4364om_g00727195004:00727_04_1950-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Oakland, California | 1950 | sanborn00727_018 p0","metadata":[{"label":"streets","value":"192"},{"label":"intersections","value":"257"}],"created":"2026-10-18T02:32:50Z","modified":"2026-10-18T02:32:50Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364om:g4364om_g00727195004:00727_04_1950-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364om:g4364om_g00727195004:00727_04_1950-0000","type":"ImageService3","width":1636,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1920.0 0.0,0.0 1636.0,0.0 1636.0,1920.0 0.0,1920.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364om:g4364om_g00727195004:00727_04_1950-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1271.5,1589.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.2104545,37.7890095]}},{"type":"Feature","properties":{"resourceCoords":[405.0,1021.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.2433949,37.8056662]}}]}}]}