{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01831_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Dundee, Illinois | 1905 | 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:gmd410m:g4104m:g4104dm:g018311905:01831_1905-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Dundee, Illinois | 1905 | sanborn01831_003 p1 [1]","metadata":[{"label":"streets","value":"32"},{"label":"intersections","value":"87"},{"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":"4701.8"}],"created":"2026-10-18T16:42:34Z","modified":"2026-10-18T16:42:34Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018311905:01831_1905-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018311905:01831_1905-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,0.0 0.0,0.0 0.0,653.1 593.4,653.1 862.0,1175.5 863.5,1175.5 1613,1175.5 1613,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018311905:01831_1905-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1336.5,693.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2798553,42.1029086]}},{"type":"Feature","properties":{"resourceCoords":[1089.1,885.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2852354,42.0980906]}}]}}]}