{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03690_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Belmont, Massachusetts | 1915 | key map | mapsnap generated fit (2026-09-23)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-23"},{"label":"run","value":"corpus-v1"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764bm:g036901915:03690_1915-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Belmont, Massachusetts | 1915 | sanborn03690_003 p1","metadata":[{"label":"streets","value":"83"},{"label":"intersections","value":"103"}],"created":"2026-09-23T10:57:21Z","modified":"2026-09-23T10:57:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764bm:g036901915:03690_1915-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764bm:g036901915:03690_1915-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1913.0 -0.0,1913.0 0.0,1732.7 0.0,1233.9 0.0,1014.0 0.0,686.9 0.0,337.3 0.0,277.9 0.0,215.9 0.0,200.5 0.0,131.4 0.0,0.0 1613.0,0.0 1613.0,159.8 1613.0,220.2 1613.0,370.9 1613.0,539.5 1613.0,635.5 1613.0,695.9 1613.0,780.4 1613.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764bm:g036901915:03690_1915-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.0,1154.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1708864,42.3784909]}},{"type":"Feature","properties":{"resourceCoords":[432.1,959.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1888472,42.3872689]}}]}}]}