{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03675_008.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Andover, Massachusetts | 1923 | 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":"23"},{"label":"placed","value":"13"},{"label":"unplaced","value":"10"},{"label":"fit sources","value":"georef-snap 10, georef 2, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"6 sheet(s) cut into 14 panels"},{"label":"unplaced pages","value":"p10__1 (tier 1, 42.66535,-71.14568 +/-416m); p10__2 (tier 1, 42.65833,-71.13880 +/-172m); p11__1 (tier 4, 42.66083,-71.14292 +/-1740m); p11__2 (tier 1, 42.68230,-71.18962 +/-153m); p11__3 (tier 4, 42.66083,-71.14292 +/-1740m); p13 (tier 1, 42.67394,-71.14114 +/-512m); p16__1 (tier 2, 42.67497,-71.15183 +/-375m); p2 (tier 2, 42.65697,-71.14489 +/-100m); p3__2 (tier 1, 42.66370,-71.13600 +/-152m); p6__2 (tier 1, 42.65957,-71.14809 +/-111m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0010__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p10 [3]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.07"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3880.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2572.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0010__3/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1536.5,1001.6 1611.9,607.0 1571.4,323.6 1515.9,199.4 1552.6,133.3 1507.9,40.6 1070.7,40.6 1072.4,748.6 1009.9,786.5 1010.0,1780.1 1038.5,1777.3 1063.5,1825.8 1202.4,1743.8 1243.6,1761.8 1279.5,1871.7 1570.8,1864.1 1583.2,1765.8 1565.5,1081.4 1536.5,1001.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0010__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1221.0,148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1486308,42.659014]}},{"type":"Feature","properties":{"resourceCoords":[1347.0,203.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1480691,42.6585607]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.63"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"170.4,1677.8 168.8,1498.2 170.3,1452.7 173.0,1045.8 176.1,823.3 194.6,672.1 184.9,672.4 196.8,101.2 368.0,47.9 366.8,70.6 489.3,36.3 701.1,48.5 830.9,15.8 1053.6,30.4 1180.0,134.9 1503.5,213.8 1529.6,112.4 1565.7,105.0 1577.5,1720.2 1596.0,1844.8 1455.8,1609.0 1430.0,1662.0 1424.1,1687.8 1293.3,1690.3 607.1,1709.8 468.4,1718.3 388.8,1725.0 159.9,1753.0 170.4,1677.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[171.0,1034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.15145590861376,42.674612002007954]}},{"type":"Feature","properties":{"resourceCoords":[890.0,1704.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14730441172948,42.67281045924903]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"348.1,98.0 430.2,103.3 573.1,115.4 1276.1,198.9 1409.9,216.1 1419.8,190.6 1454.1,140.4 1561.5,402.1 1562.6,1853.1 1404.9,1888.0 1159.9,1848.5 1007.2,1881.2 745.6,1831.2 491.8,1858.5 331.6,1834.7 267.7,1845.0 259.1,1702.8 240.6,1344.0 235.7,1266.3 194.9,863.2 170.3,625.9 110.4,92.2 348.1,98.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[446.0,103.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14923956712876,42.67245318440754]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,1121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14375675193327,42.670177313221615]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1202.1,1897.2 555.7,1835.2 150.7,1867.8 154.3,1844.2 81.6,1828.0 31.1,1619.8 79.7,780.6 71.8,539.4 25.9,380.1 40.9,226.9 111.5,106.5 98.2,74.3 571.3,17.4 772.0,41.5 770.8,46.4 1488.0,111.6 1489.7,115.2 1513.9,165.1 1515.1,690.1 1513.6,923.3 1510.1,1319.4 1506.5,1395.4 1486.0,1746.0 1479.2,1885.0 1202.1,1897.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0015/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.15762642910401,42.67011150573658]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.15068972591533,42.672759355815806]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.14644879477937,42.66666754386329]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.15338549796806,42.66401969378406]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0016__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p16 [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":"1712.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4740.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0016__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"711.5,1759.4 711.5,1764.4 1410.5,1653.5 1447.9,1698.5 1459.5,1623.7 1460.2,1444.7 1462.5,1399.3 1470.6,994.0 1476.7,772.3 1497.2,621.9 1487.5,622.0 1507.2,53.0 1476.8,62.0 1415.2,47.6 1357.7,129.8 908.7,70.2 533.8,70.2 536.8,155.2 592.3,179.7 710.3,345.2 762.6,595.0 898.8,829.9 903.4,1022.4 930.1,1055.5 872.5,1447.8 852.2,1479.1 852.0,1494.0 851.6,1494.0 842.6,1494.0 758.5,1624.0 735.1,1756.3 711.5,1759.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0016__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[796.7,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.15572224207533,42.67732208403154]}},{"type":"Feature","properties":{"resourceCoords":[1468.1,1693.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.15065938704453,42.672107250628656]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0003__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p3 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"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":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0003__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"329.8,1766.2 813.0,1820.3 1573.5,1893.0 1546.8,1804.4 1496.5,1596.5 1442.2,1343.3 1435.4,1344.6 1381.3,1064.8 1330.5,825.5 1303.7,663.3 1175.7,1.0 1100.2,1.0 1097.2,65.0 949.6,21.4 579.9,57.4 296.0,294.4 376.0,463.2 526.0,576.3 534.8,831.0 466.3,1062.9 268.7,1317.8 133.9,1644.7 207.8,1763.3 329.8,1766.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0003__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1082.0,1406.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14309207905794,42.65822626225691]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,1349.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14229219771435,42.658509444160494]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"345.5,1861.1 578.6,1655.3 655.1,1707.5 736.0,1740.5 1195.8,1813.5 1425.2,1855.0 1527.6,1867.6 1528.5,1818.5 1532.3,1585.2 1529.9,874.0 1516.6,803.6 1497.7,703.9 1435.8,378.1 701.9,167.5 237.0,25.9 118.9,1.0 117.7,1.0 131.2,34.8 21.1,607.2 40.3,747.4 160.7,914.7 162.6,1299.1 25.1,1628.3 96.9,1779.9 165.9,1912.0 213.7,1912.0 283.8,1912.0 345.5,1861.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0004/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.14520093745718,42.65704185423433]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.14160010868406,42.6583966234515]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.13943065927047,42.655233767100555]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1913.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.14303148804359,42.65387899788338]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"152.1,698.1 241.0,692.1 306.2,626.5 496.7,501.1 594.0,451.4 872.9,343.2 1157.6,251.9 1269.2,211.8 1326.7,1159.6 1369.4,1161.7 1469.0,1770.9 1403.0,1766.5 902.3,1761.0 901.5,1726.3 191.5,1700.7 189.5,1484.9 168.7,774.9 153.6,705.1 152.1,698.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[849.0,355.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13969559474887,42.65812474997872]}},{"type":"Feature","properties":{"resourceCoords":[181.0,1771.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13969366365578,42.655221374215415]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0006__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p6 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.94"},{"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":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0006__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"190.5,1739.1 229.3,1698.3 278.7,1723.0 459.7,1817.2 515.5,1728.2 866.3,1733.8 880.2,1709.4 858.5,1688.1 1169.7,1198.3 1171.2,1199.2 1171.3,1198.9 1186.6,1207.4 1393.6,1317.6 1508.1,1317.3 1570.4,1244.3 1574.6,760.4 1459.5,458.9 1506.1,328.7 1469.5,219.5 1612.0,56.6 1570.2,48.6 1479.3,58.7 1380.1,60.0 1128.1,53.8 992.5,57.4 421.2,53.5 374.9,55.2 108.0,978.0 148.0,994.5 36.2,1608.9 89.5,1632.0 204.2,1686.2 181.7,1742.5 189.0,1737.8 190.5,1739.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0006__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[819.0,1221.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1360568,42.6577581]}},{"type":"Feature","properties":{"resourceCoords":[108.0,978.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13774,42.657154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1275.5,1694.4 1273.7,1745.1 972.0,1798.4 973.8,1859.2 914.3,1861.6 890.4,1844.9 854.0,1758.9 510.9,1794.6 480.6,1816.9 455.1,1802.6 120.3,1880.0 131.8,1853.0 25.7,1505.0 34.4,1018.9 71.3,895.3 36.6,808.8 17.4,322.8 119.8,23.8 160.5,97.3 199.2,161.2 258.0,157.2 287.2,129.5 397.1,18.2 437.0,41.8 478.4,55.6 710.4,76.4 826.2,89.3 877.8,92.0 876.6,67.4 876.2,58.8 1233.8,58.4 1234.9,75.8 1486.8,69.2 1549.0,71.0 1612.0,75.0 1612.0,82.7 1612.0,105.1 1561.2,242.1 1597.8,1348.8 1561.8,1488.8 1563.6,1847.9 1540.8,1896.5 1525.0,1835.5 1275.5,1694.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[920.0,1254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13719013771677,42.65136190947127]}},{"type":"Feature","properties":{"resourceCoords":[920.0,1834.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13604800746863,42.64939700919516]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.41"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1577.6,1062.9 1599.7,1644.6 1573.8,1857.2 1087.6,1872.2 965.4,1901.5 552.9,1863.9 68.3,1870.7 16.9,1764.7 90.0,966.7 44.4,822.5 80.9,731.9 25.7,575.5 28.3,245.3 89.5,97.9 139.1,107.5 203.2,24.1 556.2,33.0 577.8,53.7 613.6,39.3 964.0,91.6 978.3,186.5 997.8,209.2 1057.6,222.1 1071.4,161.1 1385.1,185.4 1400.0,135.4 1612.0,339.8 1612.0,404.4 1580.0,443.1 1612.0,872.8 1612.0,877.3 1577.6,1062.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1592.0,1566.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.12968789990673,42.646738584685615]}},{"type":"Feature","properties":{"resourceCoords":[880.0,1240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13340917681036,42.64610752200286]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p9 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"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":"5236.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1243.0,1522.4 1266.4,1511.1 1275.5,1327.4 1243.8,1024.3 1271.8,724.3 1256.3,421.6 1224.3,404.7 1208.5,318.6 1069.3,257.2 1054.1,216.4 1096.4,136.6 986.1,82.2 722.9,69.6 521.1,126.3 425.3,214.7 327.4,183.2 307.1,221.6 260.1,225.3 104.8,163.5 70.5,243.5 68.0,626.6 38.5,743.4 74.9,750.8 71.9,1084.0 69.0,1165.0 70.1,1285.6 68.8,1426.2 72.3,1426.2 73.8,1554.0 77.7,1659.4 81.9,1704.8 109.2,1866.9 116.8,1912.0 161.2,1912.0 195.1,1880.9 292.5,1823.0 341.9,1800.5 482.8,1753.2 626.1,1714.4 682.5,1697.0 704.0,1689.5 972.9,1609.4 1036.1,1588.3 1155.3,1555.0 1201.8,1540.2 1243.0,1522.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[37.0,1418.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.14244956449366,42.658490409697734]}},{"type":"Feature","properties":{"resourceCoords":[1250.0,1572.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.13664310851676,42.660101350783385]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Andover, Massachusetts | 1923 | sanborn03675_008 p9 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.59"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"5178.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1274.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-19T15:48:25Z","modified":"2026-10-19T15:48:25Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1329.0,1667.2 1342.9,1663.7 1464.3,1795.5 1516.8,1784.8 1545.7,1885.0 1553.9,1912.0 1582.7,1912.0 1565.8,1503.7 1610.0,1373.1 1612.0,554.5 1612.0,442.6 1575.2,255.0 1485.6,64.9 1420.4,127.3 1349.0,125.7 1329.0,1667.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764am:g036751923:03675_1923-0009__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1466.2,495.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.12935925358337,42.65680542637644]}},{"type":"Feature","properties":{"resourceCoords":[1466.2,1794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1356930531801,42.65669985416604]}}]}}]}