{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03839_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Saugus, Massachusetts | 1913 | mapsnap generated fit (2026-10-19)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-19"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"22"},{"label":"placed","value":"17"},{"label":"unplaced","value":"5"},{"label":"fit sources","value":"georef-snap 8, georef 5, georef-street 3, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"6 sheet(s) cut into 13 panels"},{"label":"unplaced pages","value":"p16__2 (tier 1, 42.44715,-70.99962 +/-145m); p2__1 (tier 1, 42.46288,-71.00916 +/-102m); p4__2 (tier 1, 42.77768,-71.06597 +/-192m); p5__2 (tier 1, 42.46070,-71.01236 +/-100m); p9__1 (tier 4, 42.45636,-71.00611 +/-1657m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1612.0,1685.3 1612.0,1739.2 1579.2,1782.5 1580.2,1791.7 1539.5,1878.0 1380.3,1891.5 683.3,1837.5 45.8,1875.4 33.5,489.9 67.4,371.1 125.4,355.4 132.4,218.2 304.9,138.8 607.8,128.7 834.9,27.4 1351.4,56.8 1421.8,34.1 1434.7,74.4 1444.4,68.7 1543.2,256.1 1505.2,256.2 1547.1,696.5 1541.5,1148.9 1557.4,1149.0 1548.6,1427.5 1542.3,1441.8 1568.8,1685.9 1612.0,1685.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[747.0,1154.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.01244292952073,42.44478618387158]}},{"type":"Feature","properties":{"resourceCoords":[747.0,700.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0134384675016,42.44519496735025]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p11","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"38.4,310.7 26.1,270.6 40.1,82.3 103.8,47.9 1482.9,44.4 1509.7,704.0 1608.6,857.9 1524.5,901.6 1538.1,1105.5 1612.0,1064.7 1612.0,1141.3 1149.9,1374.9 1124.7,1389.8 1103.1,1389.6 1023.6,1388.8 478.1,1689.2 469.9,1686.6 352.7,1825.3 324.4,1878.6 255.8,1912.0 150.1,1912.0 127.1,1670.2 133.6,1656.2 146.0,1379.7 130.2,1379.3 141.8,930.1 106.1,492.2 143.8,492.6 48.1,305.2 38.4,310.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0011/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0147082,42.4470829]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0127745,42.4497298]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0085202,42.448037500000005]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0104539,42.4453906]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1309.5,1416.7 1297.2,1315.8 1507.8,72.6 1498.2,75.1 954.8,24.5 438.8,72.3 433.4,70.4 394.1,156.0 529.2,307.5 562.4,230.4 609.1,290.5 389.5,755.8 378.9,782.9 375.5,785.4 361.8,795.9 298.9,843.8 54.7,1412.4 46.7,1415.3 39.5,1595.6 49.8,1654.7 1.0,1754.2 1.0,1858.8 6.3,1864.4 48.6,1833.2 134.9,1886.9 1115.3,1854.9 1513.3,1896.6 1612.0,1884.1 1612.0,1854.6 1467.2,1848.2 1445.5,1414.6 1419.0,1413.8 1309.5,1416.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[780.0,472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00965392445397,42.44853604891613]}},{"type":"Feature","properties":{"resourceCoords":[1614.0,14.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00818235021654,42.44995289132632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.0,1397.2 135.2,1401.2 104.2,1833.7 247.1,1857.7 244.5,1886.9 479.2,1885.9 754.7,1773.8 1195.6,1734.9 1528.2,1887.2 1482.5,1412.3 1504.5,1402.8 1480.0,636.0 1369.0,620.3 1575.7,294.2 1612.0,289.9 1612.0,145.7 1424.2,62.9 1435.3,1.0 1231.7,1.0 791.7,28.8 741.2,24.5 359.2,77.8 1.0,1281.9 1.0,1386.9 47.0,1391.3 109.0,1397.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1117.0,1514.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00484471011585,42.44818012176551]}},{"type":"Feature","properties":{"resourceCoords":[462.0,39.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00819516309579,42.44993325580827]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p14 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.88"},{"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":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"68.7,307.4 180.0,336.9 111.5,1122.1 87.9,1129.2 76.7,1619.1 110.6,1639.8 299.6,1636.1 526.9,1764.2 770.3,1774.3 888.7,1874.6 1210.4,1879.8 1556.8,1792.2 1553.5,924.3 1279.3,760.3 1111.1,761.3 964.8,648.9 939.2,173.4 762.2,1.0 318.4,1.0 68.7,307.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[254.0,1080.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.003925,42.448951]}},{"type":"Feature","properties":{"resourceCoords":[988.0,954.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.002673,42.449951]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p14 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.62"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4014.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2438.0"},{"label":"split_canvas_h","value":"2626.0"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1581.7,624.9 1584.4,61.7 1091.8,20.9 1018.4,190.8 1029.2,511.1 1089.2,642.5 1581.7,624.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0014__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1003.5,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99719714544275,42.45030484864235]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99566554343379,42.45016444440189]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,656.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99587081179173,42.448952864243786]}},{"type":"Feature","properties":{"resourceCoords":[1003.5,656.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.9974024138007,42.44909326848424]}},{"type":"Feature","properties":{"resourceCoords":[1295.2,287.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.996553,42.4497075]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1517.1,355.4 1518.0,596.4 1534.7,797.9 1564.3,1157.5 1596.6,1529.1 1561.0,1533.0 1564.1,1672.0 1586.3,1665.8 1526.4,1881.0 1219.9,1826.2 1054.1,1878.8 72.7,1878.6 19.1,1781.5 79.3,1252.7 32.0,1031.9 47.6,99.0 126.2,58.8 251.1,94.8 281.9,70.2 369.5,34.8 608.2,19.8 1171.2,92.0 1344.0,37.2 1492.2,96.6 1531.8,53.6 1555.0,120.5 1517.1,355.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,1241.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.98918984533056,42.456184954189084]}},{"type":"Feature","properties":{"resourceCoords":[488.0,255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9918438387146,42.456080570122545]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p16 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"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":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"6287.2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"204.6,469.5 203.7,671.1 202.9,834.8 202.0,1030.9 202.0,1402.8 166.2,1403.6 157.3,1542.0 179.9,1537.7 605.4,1448.0 665.9,1123.3 902.1,855.5 1416.5,836.3 1515.8,717.7 1524.2,589.9 1433.9,550.9 1368.3,291.5 1416.8,243.6 1268.7,276.8 930.4,123.1 386.8,45.0 305.3,78.1 282.7,1.0 281.1,1.0 224.4,230.1 204.6,469.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[202.0,1030.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.988853,42.457481]}},{"type":"Feature","properties":{"resourceCoords":[202.0,1402.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.987935,42.457329]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p16 [3]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.36"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5763.2"},{"label":"split_canvas_w","value":"2784.0"},{"label":"split_canvas_h","value":"1888.8"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.1,1910.4 672.3,1895.6 680.7,1571.6 591.5,1484.8 509.0,1609.5 113.8,1564.4 28.4,1632.3 27.1,1910.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0016__3/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1440.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99468894823102,42.4678956323444]}},{"type":"Feature","properties":{"resourceCoords":[696.0,1440.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.9935153255988,42.468850611367905]}},{"type":"Feature","properties":{"resourceCoords":[696.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99264173706192,42.46825806930691]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.99381535969414,42.46730309028341]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0002__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p2 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"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":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0002__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1023.0,1885.2 1501.0,1855.2 1570.8,1770.2 1575.6,839.0 1519.7,777.8 1554.9,317.3 1520.1,110.4 1376.9,30.7 825.6,57.5 583.2,230.0 348.0,241.6 238.5,889.4 330.1,974.2 322.9,1135.2 709.5,1181.8 792.0,1471.5 797.3,1845.8 1023.0,1885.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0002__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1117.0,1106.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.01743505630533,42.464400810065065]}},{"type":"Feature","properties":{"resourceCoords":[1117.0,80.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.01487707552225,42.464484871828994]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p3","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1545.2,528.4 1566.2,760.3 1571.2,847.6 1558.0,1095.8 1562.4,1502.3 1577.8,1912.0 1475.1,1912.0 1471.8,1881.6 1012.3,1807.8 823.5,1809.9 753.2,1885.1 72.3,1869.3 26.3,1576.1 32.2,52.9 448.2,15.0 713.3,70.0 714.0,116.2 847.5,178.3 1433.0,416.1 1501.0,480.9 1543.5,480.6 1545.2,528.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0003/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0089833,42.4678138]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0087159,42.4648148]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0135375,42.4645808]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0138049,42.4675798]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0004__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p4 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3086.8"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"4565.2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0004__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"824.9,1849.5 893.2,1852.7 1118.2,1881.7 1211.7,1903.8 1499.5,1883.8 1506.8,908.3 1458.5,908.3 1450.9,959.7 819.9,952.5 773.1,810.9 702.2,790.7 245.1,877.3 119.8,809.2 54.3,992.6 42.5,1499.5 1.0,1490.3 1.0,1536.8 132.6,1600.3 714.4,1846.3 781.4,1912.0 823.8,1912.0 823.6,1903.3 824.9,1849.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0004__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[500.0,1765.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00963315147986,42.46550889728033]}},{"type":"Feature","properties":{"resourceCoords":[500.0,1365.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00862567205142,42.46556864283311]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0005__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p5 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"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":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0005__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"38.1,1620.2 59.6,1836.7 337.9,1886.8 544.7,1736.2 569.9,1499.4 668.8,1340.5 1241.3,1326.2 1305.3,578.8 1446.4,531.6 1567.9,360.1 1568.8,157.6 1612.0,157.4 1612.0,152.2 937.9,162.0 937.0,150.9 794.0,162.6 507.2,183.7 413.9,162.1 189.7,134.2 121.5,131.3 120.5,184.9 121.9,241.6 140.6,472.8 144.7,559.9 129.0,807.0 129.2,1212.0 140.3,1620.3 38.1,1620.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[986.0,736.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0111428,42.4631947]}},{"type":"Feature","properties":{"resourceCoords":[129.0,807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.011487,42.4647829]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"895.5,1869.9 895.6,1864.7 226.0,1866.8 225.2,1855.7 83.1,1865.7 97.2,899.4 49.3,899.1 91.7,623.6 43.0,439.5 105.2,222.1 62.8,132.1 112.5,57.3 1466.6,32.0 1551.0,53.8 1579.8,135.4 1502.2,775.9 1590.5,1409.2 1612.0,1415.4 1612.0,1522.9 1414.0,1704.2 1381.4,1758.8 1366.0,1837.2 1371.6,1870.4 1290.5,1851.1 1283.2,1872.6 895.5,1869.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1294.0,1816.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00933399270482,42.461370596603665]}},{"type":"Feature","properties":{"resourceCoords":[446.0,599.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0064281845628,42.46316130776267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p7","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.52"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1039.4,1.0 1016.8,1.0 1021.3,14.3 67.0,49.5 20.3,431.3 88.4,918.2 28.4,1125.7 60.8,1828.8 296.1,1881.9 467.4,1795.2 652.3,1794.2 746.2,1874.7 1562.7,1881.0 1612.0,1691.6 1612.0,1690.5 1512.3,1315.6 1590.7,822.2 1557.6,165.2 1455.4,199.1 1218.9,69.7 1156.5,56.5 1076.9,67.2 1047.3,83.3 1039.4,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0007/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0119895,42.4618377]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0080078,42.461114]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0091711,42.457630200000004]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0131528,42.4583539]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"36.3,1760.0 44.5,114.4 660.5,242.6 742.5,139.2 924.0,123.9 966.5,56.0 1219.0,50.9 1581.0,200.4 1486.3,570.9 1570.2,821.2 1575.3,1718.5 1509.6,1823.5 1394.5,1828.7 1346.2,1912.0 910.8,1912.0 709.4,1817.5 722.3,1754.0 531.7,1749.5 69.0,1767.7 17.8,1762.2 36.3,1760.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1311.0,1438.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0052850045331,42.45200457264731]}},{"type":"Feature","properties":{"resourceCoords":[74.0,1379.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.00799419702766,42.45088088133173]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0009__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Saugus, Massachusetts | 1913 | sanborn03839_002 p9 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.88"},{"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":"2026-10-19T15:42:24Z","modified":"2026-10-19T15:42:24Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0009__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1599.7,1719.2 1588.1,339.1 1449.3,76.8 1321.9,17.9 333.8,24.1 104.1,76.2 19.8,571.7 64.6,1015.8 374.4,1042.2 411.4,1331.2 675.4,1364.0 691.0,1364.0 691.0,1366.0 692.7,1366.2 783.2,1858.8 1523.3,1873.7 1599.7,1719.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038391913:03839_1913-0009__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[936.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0180947,42.4523163]}},{"type":"Feature","properties":{"resourceCoords":[1250.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0174117,42.4520174]}}]}}]}