{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn08431_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Big Spring, Texas | 1922 | key map | mapsnap generated fit (2026-09-23)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-23"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd403m:g4034m:g4034bm:g08431006:sb000010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Big Spring, Texas | 1922 | sanborn08431_006 p1","metadata":[{"label":"streets","value":"38"},{"label":"intersections","value":"165"}],"created":"2026-09-23T04:49:03Z","modified":"2026-09-23T04:49:03Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd403m:g4034m:g4034bm:g08431006:sb000010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd403m:g4034m:g4034bm:g08431006:sb000010/info.json","type":"ImageService2","height":10256,"width":8684},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,10256.0 0.0,0.0 4990.9,0.0 8684.0,0.0 8684.0,10256.0 0.0,10256.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd403m:g4034m:g4034bm:g08431006:sb000010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[766.3,2314.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-101.496213,32.2494766]}},{"type":"Feature","properties":{"resourceCoords":[3987.4,3420.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-101.4741017,32.2477382]}}]}}]}