{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02562_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Alta, Iowa | 1933 | 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"},{"label":"pages","value":"7"},{"label":"placed","value":"4"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef-snap 2, georef 2"},{"label":"key map","value":"none"},{"label":"split sheets","value":"2 sheet(s) cut into 6 panels"},{"label":"unplaced pages","value":"p1__2 (tier 4, 42.67289,-95.30406 +/-406m); p1__3 (tier 4, 42.67289,-95.30406 +/-406m); p3__2 (tier 1, 42.66827,-95.30898 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alta, Iowa | 1933 | sanborn02562_001 p1 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.73"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2700.0"},{"label":"split_canvas_h","value":"3849.6"}],"created":"2026-10-18T16:52:48Z","modified":"2026-10-18T16:52:48Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"57.3,880.6 333.6,870.5 336.9,959.7 350.6,959.6 347.4,899.7 588.8,877.8 640.4,839.9 616.5,456.9 651.8,318.8 641.1,88.3 328.1,44.2 81.1,64.8 94.0,113.2 45.9,404.8 57.2,407.6 59.6,577.7 57.3,880.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[339.0,863.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.3002300828748,42.672501432877446]}},{"type":"Feature","properties":{"resourceCoords":[55.0,581.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.30161197974408,42.673538508510404]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alta, Iowa | 1933 | sanborn02562_001 p1 [4]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3797.2"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3854.8"}],"created":"2026-10-18T16:52:48Z","modified":"2026-10-18T16:52:48Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1550.8,989.5 1522.0,971.4 797.6,976.2 607.8,1015.0 581.8,982.4 146.4,987.5 81.1,1032.2 119.0,1141.5 120.6,1276.8 51.4,1303.2 36.4,1892.3 490.2,1908.9 581.5,1885.9 614.7,1911.1 705.7,1873.5 724.2,1895.2 1045.8,1888.0 1221.2,1854.2 1221.2,1843.7 1361.8,1850.0 1502.4,1848.3 1499.0,1563.1 1505.7,1238.4 1510.8,1239.3 1550.8,989.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0001__4/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1221.0,1560.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.306671,42.673597]}},{"type":"Feature","properties":{"resourceCoords":[183.0,1560.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.311876,42.673642]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alta, Iowa | 1933 | sanborn02562_001 p2","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T16:52:48Z","modified":"2026-10-18T16:52:48Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"80.0,1234.0 95.3,592.4 105.5,594.2 185.9,100.8 252.8,143.2 649.7,60.4 910.9,181.0 1467.0,125.7 1540.3,240.8 1580.1,237.7 1604.8,331.8 1508.0,897.9 1530.2,903.4 1533.0,1234.0 1526.2,1759.6 964.4,1755.5 963.8,1802.5 743.5,1804.4 529.6,1800.9 84.8,1797.7 80.0,1234.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[80.0,1234.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.305277,42.673574]}},{"type":"Feature","properties":{"resourceCoords":[1533.0,1234.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.301589,42.673551]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0003__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alta, Iowa | 1933 | sanborn02562_001 p3 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"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":"2026-10-18T16:52:48Z","modified":"2026-10-18T16:52:48Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0003__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"66.4,175.6 71.5,257.2 25.2,369.4 46.6,532.5 20.4,949.0 62.2,1639.1 133.9,1704.7 323.3,1705.2 351.1,1808.7 849.6,1852.0 900.0,1326.0 900.0,1296.5 902.8,1296.5 903.1,1293.9 1541.3,1256.8 1560.0,625.0 1536.8,217.7 1523.2,217.8 1519.5,128.3 1243.6,139.4 1243.7,107.2 955.1,107.6 955.0,131.8 841.8,133.8 731.9,132.9 503.3,133.3 360.6,135.8 217.8,130.2 217.9,140.9 66.4,175.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025621933:02562_1933-0003__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[505.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.30531761994308,42.67045300012417]}},{"type":"Feature","properties":{"resourceCoords":[729.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-95.30421119523562,42.6704388438055]}}]}}]}