{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn09050_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Norfolk, Virginia | 1921 | key map | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000L/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Norfolk, Virginia | 1921 | sanborn09050_006 p0L","metadata":[{"label":"streets","value":"154"},{"label":"intersections","value":"223"}],"created":"2026-10-18T07:30:51Z","modified":"2026-10-18T07:30:51Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000L/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000L","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:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000L/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1520.5,709.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.273801,36.866257]}},{"type":"Feature","properties":{"resourceCoords":[896.8,984.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.305745,36.8772162]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000R/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Norfolk, Virginia | 1921 | sanborn09050_006 p0R","metadata":[{"label":"streets","value":"102"},{"label":"intersections","value":"126"}],"created":"2026-10-18T07:30:51Z","modified":"2026-10-18T07:30:51Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000R/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000R","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:gmd388m:g3884m:g3884nm:g3884nm_g09050192103:09050_03_1921-0000R/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[858.8,1309.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.263195,36.821205]}},{"type":"Feature","properties":{"resourceCoords":[339.9,1053.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.271786,36.844013]}}]}}]}