{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn02737_003.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Maquoketa, 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://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027371899:02737_1899-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Maquoketa, Iowa | 1899 | sanborn02737_003 p1 [1]","metadata":[{"label":"streets","value":"25"},{"label":"intersections","value":"99"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6878.4"},{"label":"split_canvas_h","value":"4031.4"}],"created":"2026-09-23T15:47:21Z","modified":"2026-09-23T15:47:21Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027371899:02737_1899-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027371899:02737_1899-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613,0.0 0.0,0.0 0.0,1007.9 251.9,1005.4 1613,987.7 1613,0.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027371899:02737_1899-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[573.7,664.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.6629073,42.0662703]}},{"type":"Feature","properties":{"resourceCoords":[96.5,449.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-90.6732046,42.0701305]}}]}}]}