{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01893_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Glen Ellyn, Illinois | 1924 | 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:g4104gm:g018931924:01893_1924-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Glen Ellyn, Illinois | 1924 | sanborn01893_002 p1","metadata":[{"label":"streets","value":"62"},{"label":"intersections","value":"174"}],"created":"2026-10-19T16:57:11Z","modified":"2026-10-19T16:57:11Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018931924:01893_1924-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104gm:g018931924:01893_1924-0001","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:g4104gm:g018931924:01893_1924-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[389.1,380.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.066852,41.885083]}},{"type":"Feature","properties":{"resourceCoords":[162.6,1140.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.0763717,41.8592537]}}]}}]}