{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn02601_002.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Charles City, Iowa | 1892 | 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://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026011892:02601_1892-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Charles City, Iowa | 1892 | sanborn02601_002 p1 [1]","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"30"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3031.8"},{"label":"split_canvas_h","value":"4239.0"}],"created":"2026-09-22T17:21:37Z","modified":"2026-09-22T17:21:37Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026011892:02601_1892-0001__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026011892:02601_1892-0001/info.json","type":"ImageService2","height":7652,"width":6452},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2952.6,4239.0 3017.9,918.3 3031.8,2.6 3031.8,0.0 -0.0,-0.0 0.0,4199.3 2952.0,4239.0 2952.6,4239.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd415m:g4154m:g4154cm:g026011892:02601_1892-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[874.2,3544.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.680965,43.062716]}},{"type":"Feature","properties":{"resourceCoords":[1946.5,1239.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.674666,43.07361]}}]}}]}