{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02580_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Blairstown, Iowa | 1921 | mapsnap generated fit (2026-10-22)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-22"},{"label":"run","value":"corpus-v2.1"},{"label":"pages","value":"5"},{"label":"placed","value":"4"},{"label":"unplaced","value":"1"},{"label":"fit sources","value":"georef-snap 2, georef 2"},{"label":"key map","value":"none"},{"label":"split sheets","value":"1 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p2__3 (tier 1, 41.90711,-92.08819 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Blairstown, Iowa | 1921 | sanborn02580_002 p1","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-22T13:33:43Z","modified":"2026-10-22T13:33:43Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"43.4,67.8 537.0,47.1 535.2,32.6 980.9,36.2 979.9,55.4 1466.3,20.2 1589.5,100.3 1585.6,1828.0 1599.9,1831.9 1600.2,1861.5 27.2,1871.3 43.4,67.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1581.0,826.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.08270899368027,41.909417562633024]}},{"type":"Feature","properties":{"resourceCoords":[896.0,56.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0844238359876,41.91084555439175]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Blairstown, Iowa | 1921 | sanborn02580_002 p2 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.54"},{"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":"2644.4"},{"label":"split_canvas_h","value":"1804.8"}],"created":"2026-10-22T13:33:43Z","modified":"2026-10-22T13:33:43Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.0,415.6 500.2,420.3 522.6,17.1 450.6,131.2 336.1,130.7 236.2,58.6 85.9,79.3 35.2,207.9 61.0,415.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.0854843392733,41.91167036608009]}},{"type":"Feature","properties":{"resourceCoords":[661.1,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.0838095397595,41.91167635270674]}},{"type":"Feature","properties":{"resourceCoords":[661.1,451.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.0838040513832,41.910825897811854]}},{"type":"Feature","properties":{"resourceCoords":[0.0,451.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.08547885089699,41.9108199111852]}},{"type":"Feature","properties":{"resourceCoords":[401.1,420.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0844632,41.910882]}},{"type":"Feature","properties":{"resourceCoords":[401.1,420.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0844632,41.910882]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Blairstown, Iowa | 1921 | sanborn02580_002 p2 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2633.6"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2322.4"},{"label":"split_canvas_h","value":"1787.2"}],"created":"2026-10-22T13:33:43Z","modified":"2026-10-22T13:33:43Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"689.0,445.8 699.8,445.8 698.7,378.8 784.0,385.6 755.7,428.3 833.7,413.9 862.0,385.4 1188.8,434.0 1159.3,100.3 1205.8,22.4 1031.3,29.7 960.5,86.7 683.1,13.3 683.5,42.2 689.0,445.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1204.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0813266725849,41.90747167155556]}},{"type":"Feature","properties":{"resourceCoords":[694.4,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.08262771138561,41.90747483859889]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Blairstown, Iowa | 1921 | sanborn02580_002 p2 [4]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1778.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"5874.0"}],"created":"2026-10-22T13:33:43Z","modified":"2026-10-22T13:33:43Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.9,479.0 2.9,1905.9 1591.2,1908.7 1588.8,890.0 1577.8,889.0 1578.1,482.6 27.9,479.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154bm:g025801921:02580_1921-0002__4/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[232.0,479.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0860657,41.9074718]}},{"type":"Feature","properties":{"resourceCoords":[1568.0,1706.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.0826473,41.9051854]}}]}}]}