{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02815_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Sac City, Iowa | 1899 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"5"},{"label":"placed","value":"2"},{"label":"unplaced","value":"3"},{"label":"fit sources","value":"georef 2"},{"label":"key map","value":"none"},{"label":"split sheets","value":"2 sheet(s) cut into 5 panels"},{"label":"unplaced pages","value":"p1__2 (tier 4, 42.42318,-94.99491 +/-423m); p1__3 (tier 4, 42.42318,-94.99491 +/-423m); p2__1 (tier 4, 42.42318,-94.99491 +/-423m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_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":"Sac City, Iowa | 1899 | sanborn02815_002 p1 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.77"},{"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":"2026-10-17T05:18:31Z","modified":"2026-10-17T05:18:31Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1033.5,1591.9 1071.3,1572.0 1233.8,1572.0 1520.6,1543.5 1570.0,1453.9 1535.1,453.1 1122.1,452.5 1122.0,452.0 1119.0,452.0 1119.0,443.5 1055.9,258.8 923.3,205.9 802.9,45.2 382.3,38.1 60.1,101.0 56.5,1824.1 909.0,1887.2 993.8,1794.6 1033.5,1591.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1098.0,971.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.999251,42.423701]}},{"type":"Feature","properties":{"resourceCoords":[1098.0,419.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.999131,42.424747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0002__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Sac City, Iowa | 1899 | sanborn02815_002 p2 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.59"},{"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":"2026-10-17T05:18:31Z","modified":"2026-10-17T05:18:31Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0002__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1361.1,52.0 1026.5,162.2 794.0,102.2 643.2,137.5 554.3,42.8 377.2,29.2 153.5,151.6 67.6,422.9 141.8,1427.6 370.4,1511.1 382.5,1511.0 382.5,1515.5 384.1,1516.1 504.4,1798.5 690.6,1833.4 1160.7,1762.5 1553.1,1808.4 1571.0,436.5 1502.5,76.2 1361.1,52.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154sm:g028151899:02815_1899-0002__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[560.0,1304.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.990638,42.423103]}},{"type":"Feature","properties":{"resourceCoords":[560.0,263.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-94.9880419,42.4229335]}}]}}]}