{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn08573_010.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Henderson, Texas | 1949 | 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:gmd403m:g4034m:g4034hm:g4034hm_g085731949:08573_1949-0001a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Henderson, Texas | 1949 | sanborn08573_010 p1a","metadata":[{"label":"streets","value":"43"},{"label":"intersections","value":"83"}],"created":"2026-09-22T23:23:07Z","modified":"2026-09-22T23:23:07Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085731949:08573_1949-0001a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085731949:08573_1949-0001a","type":"ImageService3","width":1612,"height":1912},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1912.0 0.0,0.0 1612.0,0.0 1612.0,1912.0 -0.0,1912.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085731949:08573_1949-0001a/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[201.4,630.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.8177315,32.1537094]}},{"type":"Feature","properties":{"resourceCoords":[851.0,671.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.7916546,32.1531965]}}]}}]}