{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn09058_006.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Portsmouth, Virginia | 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:gmd388m:g3884m:g3884pm:g3884pm_g09058195001:09058_01_1950-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portsmouth, Virginia | 1950 | sanborn09058_006 p0","metadata":[{"label":"streets","value":"56"},{"label":"intersections","value":"61"}],"created":"2026-09-21T21:10:13Z","modified":"2026-09-21T21:10:13Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g09058195001:09058_01_1950-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g09058195001:09058_01_1950-0000","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1949.0 -0.0,-0.0 1652.0,-0.0 1652.0,1949.0 -0.0,1949.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd388m:g3884m:g3884pm:g3884pm_g09058195001:09058_01_1950-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[814.6,1773.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.317917,36.818308]}},{"type":"Feature","properties":{"resourceCoords":[924.6,1350.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-76.3128564,36.8350657]}}]}}]}