{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn04023_024.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Grand Rapids, Michigan | 1921 | mapsnap generated fit (2026-10-22)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-22"},{"label":"run","value":"corpus-v2.1"},{"label":"pages","value":"1"},{"label":"placed","value":"1"},{"label":"unplaced","value":"0"},{"label":"fit sources","value":"georef-snap 1"},{"label":"key map","value":"none"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g040231921:043231921-0412/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1921 | sanborn04023_024 p412","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-22T14:01:01Z","modified":"2026-10-22T14:01:01Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g040231921:043231921-0412/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g040231921:043231921-0412","type":"ImageService3","width":1594,"height":1906},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"18.8,1277.6 29.4,979.1 40.0,977.0 42.0,959.0 30.1,958.4 61.1,87.8 369.6,70.4 490.4,33.6 1504.3,46.2 1553.5,264.1 1576.0,898.9 1544.8,1856.1 1476.6,1881.4 52.0,1861.2 18.5,1747.9 18.8,1277.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g040231921:043231921-0412/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[554.0,1096.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.65565035102927,42.929942886502396]}},{"type":"Feature","properties":{"resourceCoords":[554.0,804.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.65574270314627,42.93100650337739]}}]}}]}