{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn01728_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Belvidere, Illinois | 1885 | 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":"5"},{"label":"placed","value":"3"},{"label":"unplaced","value":"2"},{"label":"fit sources","value":"georef 3"},{"label":"key map","value":"none"},{"label":"split sheets","value":"1 sheet(s) cut into 3 panels"},{"label":"unplaced pages","value":"p1__1 (tier 1, 42.25348,-88.84437 +/-210m); p1__3 (tier 4, 42.25516,-88.84003 +/-349m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Belvidere, Illinois | 1885 | sanborn01728_001 p1 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.61"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3248.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3204.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-18T23:21:42Z","modified":"2026-10-18T23:21:42Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1273.9,1708.5 1585.3,1478.3 1507.1,1438.8 1611.3,788.5 1220.1,795.3 1176.6,538.6 1215.6,316.1 1540.2,277.9 1597.5,212.6 1570.8,103.0 1473.7,40.1 1407.6,81.0 998.8,38.8 895.3,105.9 873.5,305.2 952.1,417.4 871.9,744.1 859.3,1489.1 816.1,1535.5 1152.5,1735.5 1180.1,1735.5 1179.2,1705.7 1273.9,1708.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1187.0,807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.841773,42.257889]}},{"type":"Feature","properties":{"resourceCoords":[1187.0,1255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.8411,42.257216]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Belvidere, Illinois | 1885 | sanborn01728_001 p2","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T23:21:42Z","modified":"2026-10-18T23:21:42Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.1,43.8 152.2,52.2 59.4,102.8 102.6,152.7 46.9,432.3 55.4,682.9 149.7,911.5 150.9,1133.4 51.9,1334.4 118.8,1792.3 333.4,1798.3 512.8,1876.1 1514.4,1856.3 1485.6,1827.8 1548.7,1591.2 1509.1,889.7 1557.0,488.4 1504.8,102.1 781.8,41.6 778.6,1.0 711.0,1.0 661.4,35.5 229.3,121.2 229.1,154.6 152.1,43.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0002/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.84114422713075,42.25391544565486]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.83703571744239,42.25389880064661]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.83706240629394,42.25029467727008]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-88.8411709159823,42.25031132227833]}},{"type":"Feature","properties":{"resourceCoords":[812.0,146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.839078,42.253632]}},{"type":"Feature","properties":{"resourceCoords":[812.0,146.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.839078,42.253632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Belvidere, Illinois | 1885 | sanborn01728_001 p3","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T23:21:42Z","modified":"2026-10-18T23:21:42Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.7,1368.6 78.2,1369.8 79.2,1869.9 1268.2,1868.5 1331.5,1912.0 1465.3,1912.0 1438.3,1893.0 1612.0,1494.7 1612.0,1354.4 1600.2,1347.5 1562.6,73.3 1472.7,28.7 242.2,27.6 89.5,112.1 81.3,425.0 1.0,598.7 1.0,624.0 230.7,912.8 231.2,1005.9 260.5,1004.0 261.4,1031.1 76.7,1368.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd410m:g4104m:g4104bm:g017281885:01728_1885-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[711.0,982.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.8396907,42.2558043]}},{"type":"Feature","properties":{"resourceCoords":[711.0,18.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-88.83765,42.2568415]}}]}}]}