{"id":"https://data.mapsnap.org/runs/v1.3/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 (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"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, 42.96381,-92.86698 +/-146m); p1__4 (tier 4, 42.96381,-92.86698 +/-146m)"}],"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":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1720.0"},{"label":"split_canvas_h","value":"1660.0"}],"created":"2026-09-21T17:46:22Z","modified":"2026-09-21T17:46:22Z","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=\"-0.0,-0.0 -0.0,415.0 430.0,414.6 429.7,0.0 -0.0,-0.0\" /></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":[430.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86512354872173,42.96328583870777]}},{"type":"Feature","properties":{"resourceCoords":[430.0,415.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86513231195899,42.96251250008451]}},{"type":"Feature","properties":{"resourceCoords":[0.0,415.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-92.86622920327878,42.962519133105765]}},{"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":"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":"2026-09-21T17:46:22Z","modified":"2026-09-21T17:46:22Z","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=\"1613.0,1913.0 1613.0,569.4 1236.3,569.4 1130.0,179.0 1094.9,0.0 429.7,0.0 430.0,414.6 0.0,415.0 0.0,949.0 427.4,956.3 424.5,1913.0 1613.0,1913.0\" /></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]}}]}}]}