{"id":"https://data.mapsnap.org/runs/v1.3/iiif/chronoscope/sanborn02613_006.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Columbus Junction, Iowa | 1935 | 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"},{"label":"pages","value":"6"},{"label":"placed","value":"4"},{"label":"unplaced","value":"2"},{"label":"fit sources","value":"georef 4"},{"label":"key map","value":"none"},{"label":"split sheets","value":"1 sheet(s) cut into 3 panels"},{"label":"unplaced pages","value":"p1 (tier 1, 41.27402,-91.36123 +/-258m); p4__1 (tier 4, 41.26905,-91.36817 +/-1391m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Columbus Junction, Iowa | 1935 | sanborn02613_006 p2","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-22T09:01:17Z","modified":"2026-09-22T09:01:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1613.0,1708.4 -0.0,1711.1 -0.0,-0.0 1613.0,0.0 1613.0,1708.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[558.0,1092.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.361725,41.280115]}},{"type":"Feature","properties":{"resourceCoords":[1044.0,1092.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.36051,41.280102]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Columbus Junction, Iowa | 1935 | sanborn02613_006 p3","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"}],"created":"2026-09-22T09:01:17Z","modified":"2026-09-22T09:01:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"70.2,100.2 1613.0,104.7 1613.0,1913.0 -0.0,1913.0 -0.0,-0.0 70.7,0.0 70.2,100.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[640.0,1552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.361778,41.276278]}},{"type":"Feature","properties":{"resourceCoords":[640.0,102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.3617449,41.2789525]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Columbus Junction, Iowa | 1935 | sanborn02613_006 p4 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-09-22T09:01:17Z","modified":"2026-09-22T09:01:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"844.8,1913.0 845.8,1568.9 1051.8,1567.4 1052.5,1913.0 1613.0,1913.0 1613.0,-0.0 252.5,0.0 250.4,317.9 0.0,320.4 -0.0,977.7 54.9,976.8 54.4,1184.1 -0.0,1185.0 0.0,1640.0 -0.0,1913.0 844.8,1913.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[631.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.3750608,41.2587538]}},{"type":"Feature","properties":{"resourceCoords":[1210.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.3750848,41.2576559]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Columbus Junction, Iowa | 1935 | sanborn02613_006 p4 [3]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"split_canvas_x","value":"3379.2"},{"label":"split_canvas_y","value":"6269.6"},{"label":"split_canvas_w","value":"830.8"},{"label":"split_canvas_h","value":"1382.4"}],"created":"2026-09-22T09:01:17Z","modified":"2026-09-22T09:01:17Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1052.4,1852.2 1051.8,1567.4 845.8,1568.9 845.0,1848.2 1052.4,1852.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154cm:g026131935:02613_1935-0004__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[844.8,1567.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-91.37552134863324,41.26038190308648]}},{"type":"Feature","properties":{"resourceCoords":[1052.5,1567.4],"type":"corner"},"geometry":{"type":"Point","coordinates":[-91.37499879583379,41.26038206977272]}},{"type":"Feature","properties":{"resourceCoords":[1052.5,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-91.37499842901369,41.25973128646527]}},{"type":"Feature","properties":{"resourceCoords":[844.8,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-91.37552098181314,41.25973111977903]}},{"type":"Feature","properties":{"resourceCoords":[1027.7,1852.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-91.375061,41.259846]}}]}}]}