{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03830_004.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Revere, Massachusetts | 1906 | 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764rm:g038301906:03830_1906-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Revere, Massachusetts | 1906 | sanborn03830_004 p0","metadata":[{"label":"streets","value":"141"},{"label":"intersections","value":"110"}],"created":"2026-09-22T01:59:15Z","modified":"2026-09-22T01:59:15Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764rm:g038301906:03830_1906-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764rm:g038301906:03830_1906-0000","type":"ImageService3","width":1695,"height":1979},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1979.0 -0.0,-0.0 1695.0,-0.0 1695.0,1979.0 -0.0,1979.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764rm:g038301906:03830_1906-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[508.5,806.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.008736,42.40888]}},{"type":"Feature","properties":{"resourceCoords":[809.5,679.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9905704,42.4128031]}}]}}]}