{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn02404_001.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Madison, Indiana | 1886 | 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd409m:g4094m:g4094mm:g4094mm_g024041886:02404_1886-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Madison, Indiana | 1886 | sanborn02404_001 p1 [1]","metadata":[{"label":"streets","value":"26"},{"label":"intersections","value":"88"},{"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":"5815.0"}],"created":"2026-09-23T04:46:27Z","modified":"2026-09-23T04:46:27Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd409m:g4094m:g4094mm:g4094mm_g024041886:02404_1886-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd409m:g4094m:g4094mm:g4094mm_g024041886:02404_1886-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,500.4 318.6,499.2 1037.4,853.5 1034.4,1453.8 1035.7,1453.8 1613,1451.2 1613,305.2 1252.3,262.4 1238.0,260.9 1252.3,259.1 1252.1,0.0 1098.3,0.0 1052.0,0.0 0.0,0.0 0.0,500.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd409m:g4094m:g4094mm:g4094mm_g024041886:02404_1886-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[774.2,333.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.3854817,38.7384588]}},{"type":"Feature","properties":{"resourceCoords":[1058.7,666.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.3757047,38.7338689]}}]}}]}