{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn01790_066.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1950 | key map | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1950 | sanborn01790_066 p0","metadata":[{"label":"streets","value":"131"},{"label":"intersections","value":"852"}],"created":"2026-09-21T21:26:33Z","modified":"2026-09-21T21:26:33Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0000","type":"ImageService3","width":1420,"height":2127},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2127.0 0.0,0.0 1420.0,0.0 1420.0,2127.0 -0.0,2127.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g01790195049:01790_49_1950-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[376.9,1588.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7106562,41.6932504]}},{"type":"Feature","properties":{"resourceCoords":[526.9,1153.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.701632,41.7146558]}}]}}]}