{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03739_004.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Groton, Massachusetts | 1921 | 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"},{"label":"pages","value":"14"},{"label":"placed","value":"4"},{"label":"unplaced","value":"10"},{"label":"fit sources","value":"georef 4"},{"label":"key map","value":"none"},{"label":"split sheets","value":"5 sheet(s) cut into 13 panels"},{"label":"unplaced pages","value":"p1__1 (tier 4, 42.60909,-71.58669 +/-3470m); p1__2 (tier 4, 42.60909,-71.58669 +/-3470m); p3__1 (tier 4, 42.60909,-71.58669 +/-3470m); p4 (tier 4, 42.60909,-71.58669 +/-3470m); p5__1 (tier 4, 42.60909,-71.58669 +/-3470m); p5__2 (tier 4, 42.60909,-71.58669 +/-3470m); p6__1 (tier 4, 42.60909,-71.58669 +/-3470m); p6__2 (tier 4, 42.60909,-71.58669 +/-3470m); p6__3 (tier 4, 42.60909,-71.58669 +/-3470m); p6__4 (tier 4, 42.60909,-71.58669 +/-3470m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Groton, Massachusetts | 1921 | sanborn03739_004 p2 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1536.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"6116.0"}],"created":"2026-09-23T16:50:46Z","modified":"2026-09-23T16:50:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1913.0 1613.0,436.1 1226.5,386.6 0.0,384.0 -0.0,1913.0 1613.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[893.0,1397.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.5727185,42.6107261]}},{"type":"Feature","properties":{"resourceCoords":[132.0,1122.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.576624,42.609785]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Groton, Massachusetts | 1921 | sanborn03739_004 p2 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"3"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"1550.0"}],"created":"2026-09-23T16:50:46Z","modified":"2026-09-23T16:50:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,-0.0 0.0,384.0 1613.0,387.5 1613.0,-0.0 0.0,-0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0002__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1625.0,208.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.571952,42.616059]}},{"type":"Feature","properties":{"resourceCoords":[-186.0,2887.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.5725098,42.6091889]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0003__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Groton, Massachusetts | 1921 | sanborn03739_004 p3 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-23T16:50:46Z","modified":"2026-09-23T16:50:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0003__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1913.0 1613.0,259.5 55.2,127.0 66.0,0.0 -0.0,-0.0 0.0,857.1 739.0,861.8 729.6,1913.0 926.2,1913.0 1613.0,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0003__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1021.0,532.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.5711412,42.6080992]}},{"type":"Feature","properties":{"resourceCoords":[1021.0,-28.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.5725098,42.6091889]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0005__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Groton, Massachusetts | 1921 | sanborn03739_004 p5 [3]","metadata":[{"label":"streets","value":"1"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3146.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"4506.0"}],"created":"2026-09-23T16:50:46Z","modified":"2026-09-23T16:50:46Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0005__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,786.5 507.3,788.3 507.0,788.3 0.0,789.1 -0.0,1913.0 1613.0,1913.0 1613.0,786.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764gm:g037391921:03739_1921-0005__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,786.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.62836900690995,42.6050948865591]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,786.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.62550963003167,42.602382024792114]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.62807884685346,42.60090809293229]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.63093822373173,42.60362095469928]}},{"type":"Feature","properties":{"resourceCoords":[1112.0,1016.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.6269212,42.602923]}}]}}]}