{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03798_001.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Nahant, Massachusetts | 1907 | key map | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764nm:g037981907:03798_1907-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Nahant, Massachusetts | 1907 | sanborn03798_001 p1","metadata":[{"label":"streets","value":"29"},{"label":"intersections","value":"31"}],"created":"2026-10-19T09:32:33Z","modified":"2026-10-19T09:32:33Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764nm:g037981907:03798_1907-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764nm:g037981907:03798_1907-0001","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:gmd376m:g3764m:g3764nm:g037981907:03798_1907-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[895.5,849.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9129139,42.4245584]}},{"type":"Feature","properties":{"resourceCoords":[671.7,598.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9228871,42.4271441]}}]}}]}