{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01827_005.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Dixon, Illinois | 1910 | key map | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018271910:01827_1910-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Dixon, Illinois | 1910 | sanborn01827_005 p1","metadata":[{"label":"streets","value":"57"},{"label":"intersections","value":"250"}],"created":"2026-10-19T17:29:49Z","modified":"2026-10-19T17:29:49Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018271910:01827_1910-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018271910:01827_1910-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,1913.0 0.0,0.0 1613.0,0.0 1613.0,1913.0 0.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104dm:g018271910:01827_1910-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[806.8,1686.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-89.4811052,41.8367099]}},{"type":"Feature","properties":{"resourceCoords":[508.6,1580.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-89.4891148,41.8368382]}}]}}]}