{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn08580_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Houston, Texas | 1890 | key map | mapsnap generated fit (2026-09-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-20"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085801890:08580_1890-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Houston, Texas | 1890 | sanborn08580_002 p1 [1]","metadata":[{"label":"streets","value":"82"},{"label":"intersections","value":"309"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6878.4"},{"label":"split_canvas_h","value":"8074.1"}],"created":"2026-09-20T23:01:41Z","modified":"2026-09-20T23:01:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085801890:08580_1890-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085801890:08580_1890-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,1913 1613,265.5 1298.5,268.9 1300.4,0.0 0.0,0.0 0.0,557.2 -0.0,1913 1613,1913\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd403m:g4034m:g4034hm:g4034hm_g085801890:08580_1890-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[578.5,789.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.375544,29.764715]}},{"type":"Feature","properties":{"resourceCoords":[1318.1,594.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.3531154,29.7700363]}}]}}]}