{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03858_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Springfield, Massachusetts | 1886 | 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":"50"},{"label":"placed","value":"29"},{"label":"unplaced","value":"21"},{"label":"fit sources","value":"georef-snap 23, georef 6"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"10 sheet(s) cut into 27 panels"},{"label":"unplaced pages","value":"p18__2 (tier 1, 42.10747,-72.58756 +/-100m); p19 (tier 1, 42.10891,-72.59326 +/-250m); p24__1 (tier 3, 42.11105,-72.59608 +/-504m); p24__2 (tier 1, 42.11216,-72.59558 +/-106m); p26__2 (tier 1, 42.11008,-72.60253 +/-124m); p27 (tier 1, 42.10976,-72.60332 +/-250m); p28__1 (tier 1, 42.10675,-72.57864 +/-122m); p28__3 (tier 1, 42.10313,-72.57024 +/-124m); p28__4 (tier 1, 42.10702,-72.57447 +/-100m); p3 (tier 3, 42.10562,-72.60759 +/-504m); p32__1 (tier 1, 42.11243,-72.60984 +/-100m); p32__3 (tier 3, 42.11160,-72.60963 +/-504m); p32__4 (tier 1, 42.11224,-72.61014 +/-100m); p33__1 (tier 1, 42.10130,-72.56879 +/-100m); p33__2 (tier 1, 42.10327,-72.57008 +/-100m); p33__3 (tier 1, 42.10320,-72.56757 +/-100m); p33__4 (tier 1, 42.10347,-72.56989 +/-100m); p34__1 (tier 4, 42.10484,-72.58731 +/-2057m); p34__2 (tier 4, 42.10484,-72.58731 +/-2057m); p8__1 (tier 3, 42.09714,-72.58838 +/-504m); p8__2 (tier 1, 42.09897,-72.58898 +/-213m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p10","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0010","type":"ImageService3","width":1607,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"170.9,1595.8 182.2,1366.5 187.2,1138.3 179.9,735.6 156.7,454.1 133.1,102.5 132.2,94.5 1021.6,87.5 1021.9,76.7 1416.0,110.2 1413.8,195.8 1408.2,642.3 1419.3,882.1 1448.6,1034.0 1471.0,1112.4 1456.0,1630.2 1530.0,1689.5 1555.8,1710.4 724.0,1722.1 550.5,1722.1 160.8,1707.5 170.9,1595.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[724.0,1721.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5847743,42.1007741]}},{"type":"Feature","properties":{"resourceCoords":[1430.0,950.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.585132,42.102615]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0011","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"268.4,1758.5 191.4,1705.0 171.1,1193.9 143.7,1118.1 104.5,970.4 77.3,735.0 52.5,294.7 47.3,173.6 46.9,165.9 1176.4,102.8 1179.2,125.1 1490.4,51.6 1561.4,101.3 1594.4,409.6 1569.8,1913.2 904.8,1948.0 493.3,1948.0 384.6,1843.1 308.7,1786.8 268.4,1758.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[270.0,1506.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58405179697657,42.102232808029534]}},{"type":"Feature","properties":{"resourceCoords":[118.0,993.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58521189071627,42.10266668294153]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p12","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0012","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"61.7,1902.7 403.9,1893.9 887.1,1891.7 1319.4,1881.4 1583.2,1875.1 1595.3,1475.4 1557.8,1476.5 1550.0,1476.8 1501.6,319.6 1524.4,317.0 1454.5,1.0 1453.5,1.0 1395.7,77.8 339.4,36.3 322.6,1.0 279.5,1.0 275.6,383.0 286.2,558.9 296.3,987.2 152.6,1245.0 72.8,1336.4 64.2,1411.3 60.6,1517.9 63.6,1696.8 61.7,1902.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[91.0,1280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5890308585175,42.1055826720989]}},{"type":"Feature","properties":{"resourceCoords":[740.0,1442.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58815451426192,42.10460156451156]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.61"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0013","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1555.3,1786.1 664.1,1821.8 665.2,1829.8 617.6,1833.2 342.6,1838.3 331.6,918.3 347.4,918.2 374.5,230.4 386.6,230.2 1561.8,265.9 1562.9,605.4 1554.3,1084.5 1554.9,1513.4 1555.3,1786.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1539.0,1086.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58863847695169,42.10382083413484]}},{"type":"Feature","properties":{"resourceCoords":[1539.0,233.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59017403370653,42.10481698001298]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.38"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0014","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"36.2,1827.1 62.4,299.1 6.8,246.4 491.9,223.2 494.0,254.9 592.0,248.5 1232.0,237.9 1269.2,237.2 1252.0,930.4 1236.0,930.6 1260.3,1857.4 1220.9,1858.4 677.6,1871.7 571.7,1867.2 569.2,1879.0 57.6,1917.1 36.2,1827.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0014/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.59443153390771,42.101871004906]}},{"type":"Feature","properties":{"resourceCoords":[1624.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.59187102332837,42.10401187403362]}},{"type":"Feature","properties":{"resourceCoords":[1624.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.58843242487535,42.10171579486194]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.5909929354547,42.09957492573432]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0015","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1516.2,175.8 1536.5,810.7 1544.3,907.9 1512.9,910.3 1543.4,1391.3 1532.7,1402.9 1523.1,1864.8 617.5,1921.5 116.0,1834.9 68.9,1895.0 46.1,1257.7 94.8,1246.2 96.3,1118.4 75.7,1048.4 56.6,930.2 35.1,340.3 517.9,283.4 574.8,273.1 1062.6,202.3 1271.2,170.4 1514.5,126.8 1516.2,175.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[887.0,229.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5932661842763,42.10389975517734]}},{"type":"Feature","properties":{"resourceCoords":[1511.0,150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59203661844676,42.10325485830873]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p16","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0016","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1349.6,1715.5 1145.3,1746.8 667.6,1816.3 612.0,1826.3 139.3,1882.3 97.1,1886.8 72.0,1889.5 47.9,525.6 38.5,525.7 64.5,501.9 42.0,90.5 324.6,69.2 324.4,52.4 757.0,51.2 757.0,48.9 1110.2,52.4 1110.3,61.2 1596.9,82.1 1594.6,149.5 1597.7,323.1 1596.0,522.8 1587.8,1672.7 1349.6,1715.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1583.0,801.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5905619412783,42.104452803308625]}},{"type":"Feature","properties":{"resourceCoords":[316.0,530.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59239845151936,42.10636771010874]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p17","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0017","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3.6,1612.8 32.9,1121.3 41.8,1121.3 51.1,764.3 48.8,764.2 54.8,326.9 37.9,326.8 20.9,40.9 362.8,27.8 1178.2,108.8 1518.6,75.3 1518.6,367.0 1539.3,596.1 1558.5,1002.5 1566.8,1128.7 1603.6,1455.9 1614.0,1628.0 1610.0,1847.2 1570.4,1820.8 1420.1,1889.2 1420.7,1847.4 1045.2,1837.7 872.5,1845.4 452.4,1848.7 201.8,1703.8 113.4,1624.2 40.0,1614.6 3.6,1612.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,1124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.589908,42.106252]}},{"type":"Feature","properties":{"resourceCoords":[1220.0,1124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.588283,42.107612]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0018__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p18 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.79"},{"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":"6532.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0018__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0018","type":"ImageService3","width":1633,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"132.5,107.4 130.1,386.5 148.1,606.0 163.0,995.1 170.0,1116.0 202.5,1429.4 211.0,1594.2 207.9,1805.8 284.6,1857.9 755.9,1829.2 1144.4,1891.6 1475.6,1822.6 1625.8,1862.0 1605.9,745.0 1073.4,626.8 1074.6,387.1 993.9,152.0 514.7,73.2 132.5,107.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0018__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[663.0,1820.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5855587,42.107902]}},{"type":"Feature","properties":{"resourceCoords":[170.0,1116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.587718,42.108072]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.45"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0002","type":"ImageService3","width":1620,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"26.7,586.3 41.0,597.3 79.2,1904.5 1505.8,1910.3 1559.7,1865.4 1585.2,1558.5 1529.0,237.3 771.2,36.9 208.3,44.4 152.1,1.0 90.9,1.0 88.8,525.5 56.4,521.4 26.7,586.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[732.0,1606.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58377778269659,42.09161859306731]}},{"type":"Feature","properties":{"resourceCoords":[732.0,38.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58081010318226,42.09331801734518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.57"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0020","type":"ImageService3","width":1639,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"431.1,115.7 1638.0,203.9 1625.8,239.8 1605.1,1874.4 1626.0,1899.1 1625.8,1908.7 235.4,1875.5 231.4,1819.3 192.8,1650.1 151.2,1410.8 138.1,1206.7 135.6,1014.5 179.0,273.0 181.7,228.4 189.3,214.7 251.5,215.3 258.7,120.8 430.1,134.2 431.1,115.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0020/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.5988636346105,42.106693300725]}},{"type":"Feature","properties":{"resourceCoords":[1639.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.59633084429751,42.10892382868742]}},{"type":"Feature","properties":{"resourceCoords":[1639.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.59278072438842,42.106673584453326]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.5953135147014,42.1044430564909]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0021","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1614.2,1838.2 1619.2,1879.9 1047.0,1907.4 932.5,1927.2 864.8,1948.0 791.7,1948.0 740.7,1948.0 729.1,1900.8 110.8,1930.1 27.2,1866.2 14.5,1777.1 43.4,93.6 91.8,48.3 236.3,94.7 373.1,34.9 676.8,131.4 791.9,134.7 1444.2,136.1 1488.8,139.9 1486.4,187.2 1485.3,261.4 1476.1,983.1 1487.1,1169.5 1508.9,1366.7 1559.8,1596.8 1604.9,1759.0 1614.2,1838.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[762.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59952276293993,42.1058038949793]}},{"type":"Feature","properties":{"resourceCoords":[1530.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59822757748583,42.10682959411503]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p22","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.35"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0022","type":"ImageService3","width":1639,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"311.3,1849.0 429.9,1853.8 1102.0,1864.0 1147.8,1868.5 1144.7,1917.3 1144.4,1928.0 1150.0,1928.0 1151.0,1935.0 1207.9,1933.3 1208.0,1933.0 1213.3,1933.2 1217.4,1838.3 1389.5,1844.9 1411.7,809.1 1476.6,486.2 1384.0,528.7 1481.8,43.6 1490.5,1.0 1483.9,1.0 1483.0,14.0 1466.0,14.0 1465.1,1.0 1389.9,1.0 1389.0,10.0 1370.0,10.0 1368.7,3.6 1243.1,78.0 87.4,73.8 28.5,775.4 88.1,1708.2 1.0,1745.2 1.0,1745.9 311.3,1849.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1449.0,482.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.60026797100832,42.10883359043743]}},{"type":"Feature","properties":{"resourceCoords":[1179.0,1861.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59826569684279,42.106828320023475]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.28"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0023","type":"ImageService3","width":1622,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1390.5,1893.8 1392.8,1927.8 1530.2,1914.7 1576.9,1848.3 1589.7,888.6 1547.1,431.4 1476.0,338.5 1621.0,195.7 1621.0,1.0 1611.0,1.0 1611.0,18.0 1592.0,17.0 1591.0,1.0 1532.9,1.0 1532.0,9.0 1516.0,9.0 1515.1,1.0 1334.3,1.0 1184.9,46.6 1183.3,93.5 883.6,195.2 720.9,193.3 567.0,191.8 335.9,189.6 256.1,193.3 180.2,660.1 267.0,616.2 216.7,926.9 232.4,1899.0 1390.5,1893.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[247.0,273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.60086378463194,42.10928567063349]}},{"type":"Feature","properties":{"resourceCoords":[184.0,614.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.60036574080497,42.108757676515324]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0025","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,856.1 1.0,1542.2 35.4,1529.8 35.8,1560.9 1.0,1574.7 1.0,1741.2 1.6,1836.6 40.9,1793.9 80.7,1861.0 452.4,1898.1 487.4,1849.1 772.4,1837.0 1547.0,1899.5 1588.3,1622.8 1540.0,96.7 1162.2,165.5 1111.3,88.3 920.9,85.8 571.0,190.4 381.6,87.4 110.4,51.2 85.7,73.5 46.4,531.7 42.5,814.7 1.0,856.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1242.0,884.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59793356588341,42.11399038534237]}},{"type":"Feature","properties":{"resourceCoords":[1242.0,1717.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.59656167200542,42.11288320227109]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0026__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p26 [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":"0.0"},{"label":"split_canvas_w","value":"6540.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0026__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0026","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1500.8,92.3 1483.8,34.1 445.4,47.9 227.6,78.5 196.8,143.0 132.0,91.0 59.2,481.1 65.8,1711.3 13.1,1747.2 16.0,1761.0 16.0,1784.0 9.0,1789.0 9.0,1844.0 1.0,1844.9 1.0,1869.8 77.4,1864.1 317.1,1860.1 460.4,1857.7 476.8,1857.5 645.7,1855.0 953.7,1741.4 954.0,1707.3 960.2,899.3 1393.8,902.2 1408.8,902.4 1432.0,902.5 1433.3,847.4 1477.1,805.6 1487.8,520.5 1538.4,59.9 1500.8,92.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0026__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[377.0,816.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.60209190387708,42.11123620081254]}},{"type":"Feature","properties":{"resourceCoords":[377.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.60304364568323,42.111968678858325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0028__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p28 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.58"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"1803.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4736.8"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0028__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0028","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1615.4,1425.9 1591.3,1186.6 1544.5,1197.3 1540.2,916.5 1549.4,491.3 1634.0,518.2 1634.0,512.8 1549.8,471.9 1312.8,356.1 802.2,97.3 707.2,47.4 725.6,68.4 638.0,128.6 569.5,508.4 596.8,1817.7 1400.2,1908.5 1577.3,1798.7 1614.5,1435.1 1615.4,1425.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0028__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[450.8,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.57439774449851,42.10954375948597]}},{"type":"Feature","properties":{"resourceCoords":[1635.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.57279568939005,42.1078098918946]}},{"type":"Feature","properties":{"resourceCoords":[1635.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.57661263530335,42.10584126074909]}},{"type":"Feature","properties":{"resourceCoords":[450.8,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.57821469041181,42.107575128340464]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0029","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"654.1,1924.6 82.6,1944.6 82.0,1939.0 80.0,1938.8 67.1,1910.4 40.0,1351.6 32.8,1180.1 36.3,1082.2 33.0,813.5 34.2,230.2 36.0,121.0 61.1,58.6 167.9,18.7 1174.5,16.7 1346.3,71.5 1524.2,25.8 1596.8,519.3 1570.2,1904.1 1232.6,1920.1 1218.5,1948.0 1191.0,1897.3 654.1,1924.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[680.0,1452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.57221602801766,42.106971555268245]}},{"type":"Feature","properties":{"resourceCoords":[680.0,1927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.57206380664974,42.10615006344926]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p30 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.46"},{"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":"6552.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030","type":"ImageService3","width":1638,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"9.4,110.4 45.2,115.0 94.4,1206.8 54.4,1607.7 207.2,1905.6 1589.8,1913.3 1605.6,1465.5 1637.0,1430.0 1637.0,1425.8 1637.0,1359.7 1142.3,1123.3 620.1,863.5 622.8,825.4 870.0,311.1 935.3,186.6 976.0,70.9 977.5,66.8 538.3,46.0 248.0,43.0 257.6,91.8 9.4,107.2 9.4,109.5 9.4,110.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[609.0,858.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.573479,42.105974]}},{"type":"Feature","properties":{"resourceCoords":[248.0,43.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.575263,42.106733]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p30 [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":"2809.6"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3742.4"},{"label":"split_canvas_h","value":"5237.6"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030","type":"ImageService3","width":1638,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"751.5,870.3 1600.8,1283.0 1567.4,138.4 1030.7,68.2 751.5,870.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0030__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1303.2,983.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56700582362473,42.10017365275289]}},{"type":"Feature","properties":{"resourceCoords":[1693.0,1192.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56594984253385,42.100313106779836]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p31 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"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":"6460.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031","type":"ImageService3","width":1615,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1341.7,1866.0 1544.9,1731.2 1573.1,1375.5 1469.1,1065.7 1542.3,953.8 1538.4,744.0 1032.9,674.0 1032.2,669.8 1032.2,669.4 944.8,91.1 609.6,15.9 490.0,51.4 432.4,146.2 160.9,162.9 83.8,393.2 149.6,462.1 84.4,537.5 86.7,1571.0 27.1,1888.9 596.4,1922.9 1341.7,1866.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[396.0,1558.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56547657434842,42.11107441107288]}},{"type":"Feature","properties":{"resourceCoords":[1242.0,1183.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56378029061182,42.109926085355596]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p31 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4128.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2331.2"},{"label":"split_canvas_h","value":"2693.2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031","type":"ImageService3","width":1615,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1589.7,349.6 1502.9,334.4 1555.5,119.7 1517.5,38.5 1063.6,33.4 1051.0,658.0 1576.4,638.3 1589.7,349.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0031__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1055.2,547.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56361548887003,42.108996688552715]}},{"type":"Feature","properties":{"resourceCoords":[1378.1,75.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.56232669639617,42.108562289083835]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p32 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.47"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2286.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4229.2"},{"label":"split_canvas_h","value":"3990.0"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1538.0,781.0 1528.2,118.6 1108.4,47.3 720.1,174.4 1214.1,112.5 1302.2,925.5 1538.0,781.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[571.7,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.61053445377544,42.111843280543766]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.60992627120568,42.11198837724922]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,997.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.60974306615498,42.11155978548087]}},{"type":"Feature","properties":{"resourceCoords":[571.7,997.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.61035124872474,42.11141468877542]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p32 [5]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.27"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3683.2"},{"label":"split_canvas_w","value":"6516.0"},{"label":"split_canvas_h","value":"4112.8"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"210.6,965.2 109.5,1766.9 1538.9,1867.7 1566.4,1165.5 210.6,965.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0032__5/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,920.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.61083532212668,42.11093481442779]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,920.8],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.60992907284368,42.11121318056066]}},{"type":"Feature","properties":{"resourceCoords":[1629.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.60969370577212,42.11078551237013]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-72.61059995505511,42.11050714623726]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p4","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0004","type":"ImageService3","width":1620,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"147.3,1676.3 80.0,1135.0 153.7,380.2 150.9,363.7 713.2,292.9 1083.2,236.6 1479.7,179.4 1458.8,389.7 1433.0,550.8 1403.2,689.5 1388.8,743.3 1452.8,730.4 1483.6,724.0 1556.1,1088.3 1561.5,1407.1 1587.5,1406.8 1366.4,1707.7 1399.7,1773.3 989.2,1905.3 694.2,1843.1 678.2,1863.3 679.0,1804.3 161.5,1794.9 165.9,1763.0 102.5,1732.8 147.3,1676.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1242.0,1138.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.581611,42.09583]}},{"type":"Feature","properties":{"resourceCoords":[931.0,1810.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5811871,42.094534]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p5","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0005","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"45.6,1814.7 63.4,1798.7 170.8,1904.4 385.8,1881.5 360.0,1815.3 461.7,1808.7 509.6,1866.3 836.0,1906.8 1146.0,1834.2 1550.1,1839.2 1573.7,1000.4 1537.4,757.6 1419.5,592.4 1480.2,220.1 1568.3,146.8 1335.1,103.1 1335.5,93.3 1026.5,80.0 526.5,63.8 353.8,59.4 335.8,126.4 223.3,499.4 190.4,590.2 127.0,792.0 68.8,944.5 11.3,1074.3 1.0,1119.9 1.0,1124.2 51.6,1124.5 83.0,1124.5 79.8,1496.3 20.1,1809.7 45.6,1814.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[127.0,792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.582329,42.097128]}},{"type":"Feature","properties":{"resourceCoords":[1403.0,1131.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5797175,42.098503]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.66"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0006","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.4,1833.7 564.3,1856.3 809.6,1876.1 938.2,1880.3 1123.2,1895.6 1362.5,1931.0 1490.8,1932.0 1495.0,1779.3 1512.9,1264.0 1527.3,945.6 1537.4,946.0 1583.0,705.8 1544.9,659.9 1544.7,78.2 752.4,42.2 309.1,88.3 310.0,1.0 299.6,1.0 290.6,143.5 286.6,206.0 170.4,312.1 107.5,386.6 96.8,399.9 113.4,1247.4 114.3,1424.2 101.7,1821.4 143.4,1827.1 229.4,1833.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[578.0,1280.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.5839792215526,42.10021159811768]}},{"type":"Feature","properties":{"resourceCoords":[1222.0,1914.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58376371361138,42.09864189183687]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0007","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"981.0,1840.3 605.0,1837.9 35.7,1819.6 20.2,114.9 52.5,24.3 89.0,23.4 92.3,85.7 1147.6,69.0 1185.0,95.6 1221.7,67.8 1581.1,62.2 1580.8,73.2 1575.2,400.1 1567.9,639.7 1570.1,765.0 1564.2,945.9 1541.5,1180.4 1546.8,1305.2 1522.0,1305.8 1507.2,1373.8 1412.3,1753.4 1383.6,1846.0 981.0,1840.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1556.0,955.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58391218458742,42.098754655871964]}},{"type":"Feature","properties":{"resourceCoords":[1556.0,1312.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.583276497711,42.09832237639993]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Springfield, Massachusetts | 1886 | sanborn03858_001 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.63"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-19T04:26:00Z","modified":"2026-10-19T04:26:00Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0009","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.6,1671.8 44.9,321.8 5.0,132.3 512.5,104.2 515.3,92.6 620.1,99.0 1158.2,96.0 1471.6,93.8 1519.1,91.0 1550.0,441.9 1579.1,722.8 1594.7,1125.2 1594.5,1353.4 1587.9,1582.7 1580.1,1694.7 1575.2,1735.7 1570.7,1809.1 1208.8,1802.2 1170.9,1828.8 1134.1,1800.8 71.6,1780.4 70.4,1717.7 33.6,1717.3 43.2,1693.1 51.6,1671.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038581886:03858_1886-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1563.0,895.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58714008357327,42.100915206117506]}},{"type":"Feature","properties":{"resourceCoords":[1633.0,1772.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-72.58543153517968,42.09999615785855]}}]}}]}