{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn03705_005.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Chelsea, Massachusetts | 1955 | key map | mapsnap generated fit (2026-09-22)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-22"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764cm:g037051955:03705_1955-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Chelsea, Massachusetts | 1955 | sanborn03705_005 p0","metadata":[{"label":"streets","value":"117"},{"label":"intersections","value":"212"}],"created":"2026-09-22T05:24:40Z","modified":"2026-09-22T05:24:40Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764cm:g037051955:03705_1955-0000/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764cm:g037051955:03705_1955-0000/info.json","type":"ImageService2","height":5392,"width":4408},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4408.0,5392.0 -0.0,5392.0 -0.0,0.0 4408.0,0.0 4408.0,2163.8 4408.0,3149.0 4408.0,3311.2 4408.0,3353.4 4408.0,5392.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd376m:g3764m:g3764cm:g037051955:03705_1955-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1895.4,2850.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0308642,42.3982212]}},{"type":"Feature","properties":{"resourceCoords":[1368.3,4319.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0416572,42.3874918]}}]}}]}