{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01846_001.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Elgin, Illinois | 1887 | 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:gmd410m:g4104m:g4104em:g018461887:01846_1887-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Elgin, Illinois | 1887 | sanborn01846_001 p1 [1]","metadata":[{"label":"streets","value":"45"},{"label":"intersections","value":"107"},{"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":"2026-09-22T17:48:18Z","modified":"2026-09-22T17:48:18Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461887:01846_1887-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461887:01846_1887-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,1913 1613,338.0 1531.3,338.0 1486.6,338.0 1223.7,338.0 1222.5,0.0 0.0,0.0 0.0,1913 1613,1913\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104em:g018461887:01846_1887-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[933.1,1031.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2778187,42.0401129]}},{"type":"Feature","properties":{"resourceCoords":[111.7,1284.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.2936775,42.0369257]}}]}}]}