{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03745_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Haverhill, Massachusetts | 1893 | 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:g3764hm:g037451893:03745_1893-0000/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Haverhill, Massachusetts | 1893 | sanborn03745_002 p0","metadata":[{"label":"streets","value":"132"},{"label":"intersections","value":"159"}],"created":"2026-09-22T08:09:26Z","modified":"2026-09-22T08:09:26Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764hm:g037451893:03745_1893-0000/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764hm:g037451893:03745_1893-0000","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1949.0 0.0,0.0 1659.0,0.0 1659.0,1949.0 -0.0,1949.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764hm:g037451893:03745_1893-0000/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[808.1,1559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0824822,42.7697623]}},{"type":"Feature","properties":{"resourceCoords":[696.6,751.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0840519,42.7871597]}}]}}]}