{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03693_010.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Boston, Massachusetts | 1897 | 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://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764bm:g03693189703:03693_03_1897-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Boston, Massachusetts | 1897 | sanborn03693_010 p0","metadata":[{"label":"streets","value":"187"},{"label":"intersections","value":"194"}],"created":"2026-09-21T08:48:31Z","modified":"2026-09-21T08:48:31Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764bm:g03693189703:03693_03_1897-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764bm:g03693189703:03693_03_1897-0000/info.json","type":"ImageService2","height":8388,"width":5820},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"5820.0,8388.0 -0.0,8388.0 -0.0,-0.0 5820.0,0.0 5820.0,8388.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764bm:g03693189703:03693_03_1897-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4699.0,3414.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.079573,42.321479]}},{"type":"Feature","properties":{"resourceCoords":[2854.0,4404.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0984291,42.3156728]}}]}}]}