{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn03909_004.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Ann Arbor, Michigan | 1908 | 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:gmd411m:g4114m:g4114am:g039091908:03909_1908-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Ann Arbor, Michigan | 1908 | sanborn03909_004 p1","metadata":[{"label":"streets","value":"92"},{"label":"intersections","value":"225"}],"created":"2026-09-23T03:21:48Z","modified":"2026-09-23T03:21:48Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114am:g039091908:03909_1908-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114am:g039091908:03909_1908-0001","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,1927.0 0.0,-0.0 1628.0,0.0 1628.0,1927.0 -0.0,1927.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114am:g039091908:03909_1908-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.8,818.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.7303816,42.2764432]}},{"type":"Feature","properties":{"resourceCoords":[412.9,934.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.749389,42.272812]}}]}}]}