{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn02621_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Creston, Iowa | 1899 | 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://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026211899:02621_1899-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Creston, Iowa | 1899 | sanborn02621_003 p1","metadata":[{"label":"streets","value":"55"},{"label":"intersections","value":"245"}],"created":"2026-09-23T05:07:59Z","modified":"2026-09-23T05:07:59Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026211899:02621_1899-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026211899:02621_1899-0001/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,7652.0 0.0,0.0 6452.0,0.0 6452.0,7652.0 -0.0,7652.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026211899:02621_1899-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2023.6,2259.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.3590425,41.0526477]}},{"type":"Feature","properties":{"resourceCoords":[2578.8,538.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.352953,41.066937]}}]}}]}