{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02738_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Marble Rock, Iowa | 1902 | 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":"4"},{"label":"placed","value":"2"},{"label":"unplaced","value":"2"},{"label":"fit sources","value":"georef 2"},{"label":"key map","value":"none"},{"label":"split sheets","value":"1 sheet(s) cut into 4 panels"},{"label":"unplaced pages","value":"p1__3 (tier 4, 42.96380,-92.86698 +/-147m); p1__4 (tier 4, 42.96380,-92.86698 +/-147m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Marble Rock, Iowa | 1902 | sanborn02738_002 p1 [1]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.29"},{"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":"1732.0"},{"label":"split_canvas_h","value":"1666.0"}],"created":"2026-10-18T01:01:18Z","modified":"2026-10-18T01:01:18Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"218.6,106.6 139.2,114.5 80.8,49.8 97.8,354.1 156.1,411.6 423.1,373.1 406.2,76.1 319.8,113.0 261.2,19.3 218.6,106.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__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":[-92.86622044004152,42.96329247172903]}},{"type":"Feature","properties":{"resourceCoords":[433.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86511589599158,42.963285792430874]}},{"type":"Feature","properties":{"resourceCoords":[433.0,416.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86512468034508,42.962510590341054]}},{"type":"Feature","properties":{"resourceCoords":[0.0,416.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86622922439501,42.96251726963921]}},{"type":"Feature","properties":{"resourceCoords":[104.0,31.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.8659558,42.9632331]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Marble Rock, Iowa | 1902 | sanborn02738_002 p1 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.84"},{"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":"2026-10-18T01:01:18Z","modified":"2026-10-18T01:01:18Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"440.8,1686.5 505.9,1831.3 1352.6,1889.6 1519.1,1882.4 1598.7,1810.1 1599.2,644.8 1526.9,572.4 1235.9,570.0 1172.3,463.7 1107.3,130.7 998.8,36.6 463.2,43.6 434.1,412.7 433.0,412.8 433.0,416.5 365.1,416.5 173.5,427.1 43.2,542.8 57.5,911.9 379.8,955.5 427.3,955.8 427.3,961.9 433.9,962.8 440.8,1686.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154mm:g027381902:02738_1902-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[766.0,281.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.868396,42.9659669]}},{"type":"Feature","properties":{"resourceCoords":[1240.0,1747.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-92.8671871,42.9632349]}}]}}]}