{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01790_009.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chicago, Illinois | 1895 | key map | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1895 | sanborn01790_009 p0a","metadata":[{"label":"streets","value":"28"},{"label":"intersections","value":"106"}],"created":"2026-10-17T19:41:24Z","modified":"2026-10-17T19:41:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000a","type":"ImageService3","width":1414,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2126.0 0.0,0.0 1414.0,0.0 1414.0,2126.0 0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000a/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1090.3,512.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7749928,41.8904902]}},{"type":"Feature","properties":{"resourceCoords":[1020.0,1015.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.7831432,41.8360891]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000b/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chicago, Illinois | 1895 | sanborn01790_009 p0b","metadata":[{"label":"streets","value":"103"},{"label":"intersections","value":"1003"}],"created":"2026-10-17T19:41:24Z","modified":"2026-10-17T19:41:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000b/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000b","type":"ImageService3","width":1414,"height":2126},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,2126.0 0.0,0.0 1414.0,0.0 1414.0,2126.0 0.0,2126.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104cm:g017901895C:01790_C_1895-0000b/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[514.5,320.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8508071,41.8695854]}},{"type":"Feature","properties":{"resourceCoords":[356.7,224.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-87.8566367,41.8621374]}}]}}]}