{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02629_007.keymap.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Des Moines, Iowa | 1920 | key map | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154dm:g02629192002:02629_02_1920-0000__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Des Moines, Iowa | 1920 | sanborn02629_007 p0 [2]","metadata":[{"label":"streets","value":"163"},{"label":"intersections","value":"830"},{"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":"8074.1"}],"created":"2026-10-18T02:37:20Z","modified":"2026-10-18T02:37:20Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154dm:g02629192002:02629_02_1920-0000__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154dm:g02629192002:02629_02_1920-0000","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"492.7,420.4 486.1,455.8 486.1,472.5 483.1,472.5 0.0,480.6 0.0,1913 1035.2,1913 1035.2,1619.2 1035.2,1592.8 1104.8,1575.9 1076.6,1576.8 1129.0,1570.0 1148.2,1565.3 1216.9,1532.6 1613,1532.6 1613,0.0 501.4,0.0 506.2,347.6 506.6,370.9 492.7,420.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154dm:g02629192002:02629_02_1920-0000__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1209.3,593.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-93.575633,41.602744]}},{"type":"Feature","properties":{"resourceCoords":[420.7,1125.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-93.6122154,41.5844879]}}]}}]}