{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03701_006.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Cambridge, Massachusetts | 1950 | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"86"},{"label":"placed","value":"80"},{"label":"unplaced","value":"6"},{"label":"fit sources","value":"georef 39, georef-snap 39, georef-street 1, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"4 sheet(s) cut into 8 panels"},{"label":"unplaced pages","value":"p25 (tier 1, 42.37042,-71.07374 +/-233m); p26__1 (tier 1, 42.36640,-71.07614 +/-262m); p26__2 (tier 1, 42.36992,-71.07029 +/-126m); p34 (tier 2, 42.36547,-71.08809 +/-127m); p75__2 (tier 1, 42.35649,-71.11515 +/-111m); p81 (tier 2, 42.35973,-71.09391 +/-432m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p1","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0001","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1461.3,1815.2 954.1,1673.2 952.2,1723.6 439.0,1722.0 438.9,1736.2 301.5,1586.8 370.0,1563.6 158.8,141.7 286.4,271.8 534.7,378.9 1240.5,617.1 1316.8,572.4 1460.5,726.5 1548.2,761.6 1573.2,789.0 1596.8,851.0 1451.2,905.9 1469.8,983.9 1465.1,1323.2 1461.3,1815.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[439.0,1722.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1066414,42.3737263]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,1315.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.103937,42.373418]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p10","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0010","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"178.7,1804.2 1379.1,1792.5 1548.6,1788.3 1510.0,1538.6 1557.2,1303.3 1487.5,1089.7 1558.9,985.8 1551.6,496.2 1483.2,289.9 1526.0,153.6 1345.7,35.8 318.8,36.7 82.9,181.3 187.0,661.2 1.0,579.6 1.0,646.1 177.2,723.2 173.0,809.8 172.4,1041.2 178.7,1804.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[173.0,863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.081094,42.372923]}},{"type":"Feature","properties":{"resourceCoords":[859.0,1797.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0798526,42.3710284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0011","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"214.9,1706.3 166.7,1653.1 139.5,1115.9 83.7,993.6 167.9,78.5 306.6,30.3 446.2,179.7 446.3,165.4 963.5,162.9 965.0,112.0 1477.2,251.1 1477.5,1134.7 1477.6,1175.7 1317.5,1183.2 1358.9,1574.5 214.9,1706.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1341.0,1568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10652261405485,42.37070392871198]}},{"type":"Feature","properties":{"resourceCoords":[961.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10556411432052,42.373234467249894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p12","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"22"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0012","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"265.0,1819.2 224.0,1472.0 184.6,1079.7 345.0,1073.0 345.2,1031.8 349.6,149.9 833.8,180.1 834.0,176.2 1231.0,184.7 1244.8,600.2 1245.7,685.4 1265.9,1034.6 1322.9,1032.2 1327.8,1075.5 1351.0,1442.3 1346.3,1464.8 1429.6,1715.9 1237.7,1734.5 706.3,1780.7 259.9,1851.1 265.0,1819.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[224.0,1472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.106493,42.370677]}},{"type":"Feature","properties":{"resourceCoords":[345.0,1073.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1057391,42.3711885]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0013","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1016.7,1822.7 1016.7,1770.0 619.5,1767.3 617.5,1800.5 134.1,1735.3 134.1,1734.5 156.1,1457.9 231.3,513.9 251.2,274.4 717.1,290.5 717.5,227.4 1394.9,322.0 1394.0,348.0 1391.8,643.8 1378.3,993.0 1382.7,1082.2 1384.1,1345.6 1380.6,1656.1 1016.7,1822.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1383.0,1762.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09756543409053,42.36927965418502]}},{"type":"Feature","properties":{"resourceCoords":[1383.0,1065.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09688951097131,42.370454973732976]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0014","type":"ImageService3","width":1622,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"206.1,1445.1 207.6,1101.6 204.2,836.8 199.2,747.1 210.2,395.9 210.4,98.5 599.4,88.4 943.5,93.7 1185.3,92.1 1288.2,835.0 1338.7,1232.3 1354.8,1332.3 1359.1,1364.0 1362.5,1388.8 1366.3,1417.7 1400.0,1666.2 1434.8,1925.8 967.5,1769.8 783.7,1705.5 225.8,1494.7 207.1,1490.5 206.1,1445.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1284.0,854.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09448018619494,42.36961507415549]}},{"type":"Feature","properties":{"resourceCoords":[953.0,652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09503118626337,42.370192604233466]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p15","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0015","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"348.1,1731.5 341.9,1731.9 268.8,1480.8 274.2,1458.8 264.6,1095.5 261.4,1052.5 205.1,1052.9 197.8,707.1 200.0,623.0 201.8,152.8 563.1,223.4 993.5,228.2 1434.9,217.5 1439.2,494.6 1441.8,664.3 1456.8,1676.1 348.1,1731.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[999.0,485.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.101339,42.370621]}},{"type":"Feature","properties":{"resourceCoords":[999.0,1049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1020064,42.3697112]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p16","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0016","type":"ImageService3","width":1614,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1027.2,1911.0 529.0,1667.5 540.0,1385.0 125.7,1379.4 176.5,379.4 184.9,212.4 664.4,262.8 665.3,230.0 1057.7,221.2 1059.2,273.2 1413.8,98.2 1414.4,128.9 1416.4,173.5 1438.5,875.9 1445.4,1379.0 1434.7,1379.2 1450.0,1740.6 1054.0,1748.9 1034.7,1749.3 1027.2,1911.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1443.0,1204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0985612,42.3675744]}},{"type":"Feature","properties":{"resourceCoords":[540.0,1385.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10081,42.367969]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0017","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1382.8,518.2 1439.0,805.0 1457.3,916.3 1542.7,1330.2 1554.0,1365.3 1047.5,1347.8 845.1,1347.9 601.4,1369.6 630.0,1738.0 602.9,1739.9 228.7,1765.7 195.4,1396.5 206.3,1395.7 174.7,881.0 117.7,162.8 136.8,165.8 712.2,338.4 901.5,390.1 1381.9,514.0 1382.8,518.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[551.0,847.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0973712931044,42.36787154796313]}},{"type":"Feature","properties":{"resourceCoords":[1543.0,1356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09578951416225,42.366227640369196]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p18","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0018","type":"ImageService3","width":1669,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.4,1626.5 45.0,1204.1 36.0,1090.9 4.0,798.5 41.9,816.6 284.1,904.7 368.6,706.2 424.4,575.6 468.6,475.8 479.8,450.5 535.5,329.9 623.4,230.7 758.1,119.8 791.2,107.5 1077.9,105.0 1405.9,116.3 1604.3,114.6 1600.2,918.0 1589.0,1680.5 1588.7,1855.3 1230.7,1797.8 875.5,1752.8 619.7,1724.3 281.4,1680.2 103.8,1662.8 95.4,1626.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1061.0,116.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0921821580569,42.36810937969461]}},{"type":"Feature","properties":{"resourceCoords":[896.0,1405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09375636616284,42.36608457457221]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p19 [1]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.99"},{"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":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019","type":"ImageService3","width":1633,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"783.0,1751.2 880.7,1662.8 1026.0,1568.1 1060.1,1559.5 1343.6,1588.5 1385.0,1239.7 1430.5,837.6 1429.0,820.6 1363.6,751.7 911.7,699.9 911.7,1.0 875.5,1.0 676.4,399.5 641.2,395.6 648.0,341.0 188.1,286.1 197.4,1042.0 197.9,1445.9 201.4,1548.0 245.1,1573.8 254.0,1580.2 415.6,1678.9 427.9,1685.1 462.2,1702.1 714.8,1864.3 783.0,1751.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[648.0,341.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0929137,42.3706325]}},{"type":"Feature","properties":{"resourceCoords":[812.0,1173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0930981,42.3691058]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p19 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.91"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3646.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2885.2"},{"label":"split_canvas_h","value":"3130.4"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019","type":"ImageService3","width":1633,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1066.5,601.9 1291.3,713.6 1463.0,410.1 1530.3,295.0 1283.0,135.6 1196.8,91.5 1079.1,15.7 1031.0,1.0 1027.7,1.0 1028.3,69.2 1031.8,580.2 1066.5,601.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0019__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1291.3,713.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0946634,42.3673368]}},{"type":"Feature","properties":{"resourceCoords":[1027.6,-16.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.094789,42.368764]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0002","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1032.0,1854.7 633.4,1844.8 633.2,1848.8 147.2,1816.8 151.4,1314.4 156.4,970.4 137.6,891.3 285.4,835.7 261.4,772.9 236.1,745.1 147.2,709.4 339.0,493.8 344.6,326.1 743.9,343.1 1047.2,122.1 1149.8,110.7 1278.5,472.8 1278.0,556.1 1155.0,516.2 1116.6,517.6 967.7,573.4 996.1,645.5 1032.0,1854.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[149.0,1330.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10397145731925,42.3733828770507]}},{"type":"Feature","properties":{"resourceCoords":[1154.0,528.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10085972958107,42.373715032111434]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p20","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0020","type":"ImageService3","width":1607,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"257.0,1889.0 575.7,1898.1 768.5,1895.3 814.8,1891.5 1213.2,1890.1 1249.0,1892.2 1323.2,1906.1 1433.6,1926.8 1521.4,1924.5 1274.8,484.8 1145.9,8.6 767.1,97.5 767.2,103.5 257.9,157.1 258.5,103.5 1.0,522.4 1.0,1075.0 181.5,1074.6 252.8,1134.0 256.1,1150.3 257.7,1545.8 257.0,1889.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[257.0,1134.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.091398,42.3694022]}},{"type":"Feature","properties":{"resourceCoords":[257.0,1889.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.092134,42.368116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0021","type":"ImageService3","width":1638,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.7,1487.0 128.0,213.6 199.5,213.7 248.8,213.7 272.7,213.7 298.4,213.7 334.9,213.8 1449.7,213.7 1450.4,1739.5 1450.4,1753.7 569.2,1628.3 569.2,1649.9 196.7,1629.0 173.8,1948.0 147.8,1948.0 174.7,1487.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[514.0,218.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08705819187453,42.3719459327921]}},{"type":"Feature","properties":{"resourceCoords":[575.0,986.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08723439221629,42.37054892343549]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p22","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0022","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"139.3,204.1 1501.9,206.6 1508.4,526.4 1503.9,602.8 1507.2,1109.3 1506.2,1512.8 1508.0,1743.8 821.1,1749.0 137.2,1742.0 139.3,204.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,1359.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0836219,42.3693968]}},{"type":"Feature","properties":{"resourceCoords":[820.0,601.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0833077,42.3707466]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0023","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"263.8,1735.8 263.3,1506.5 266.5,1105.9 266.0,603.0 270.9,527.2 266.2,209.7 1464.2,219.5 1463.8,613.1 1460.6,1023.2 1453.7,1374.4 1452.9,1752.5 1195.1,1744.2 896.8,1744.2 263.8,1735.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[263.0,608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.081669324811,42.37052598165169]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1737.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.07919951917404,42.36813957731332]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p24","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0024","type":"ImageService3","width":1622,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"344.9,196.3 914.0,220.9 1515.7,143.8 1599.2,321.8 1529.8,682.6 1536.4,1430.3 1472.2,1486.2 1471.8,1704.8 827.3,1637.2 827.5,1695.5 147.4,1707.8 144.1,1335.4 147.2,989.4 145.9,585.4 142.2,197.7 344.9,196.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[147.0,957.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.078913,42.369482]}},{"type":"Feature","properties":{"resourceCoords":[826.0,1336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0774066,42.3685733]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0027","type":"ImageService3","width":1650,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1553.8,1824.1 1485.8,1802.2 1527.9,1786.2 1531.1,623.0 1533.2,266.6 1533.2,259.4 647.8,127.9 647.5,149.6 273.1,126.3 248.1,446.9 221.9,446.8 155.9,1472.0 1.0,1430.4 1.0,1440.2 518.2,1868.1 443.5,1935.0 878.6,1935.0 964.2,1921.8 977.9,1935.0 1094.0,1935.0 1131.0,1939.0 1132.0,1948.0 1420.5,1948.0 1565.4,1824.3 1553.8,1824.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1536.0,1001.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08572603345172,42.367573006457604]}},{"type":"Feature","properties":{"resourceCoords":[638.0,1001.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08789683607972,42.3678417705597]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p28","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0028","type":"ImageService3","width":1622,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"979.0,1750.4 602.9,1761.8 563.8,1772.4 558.5,619.9 558.0,266.7 557.9,245.5 1234.1,250.3 1233.5,779.1 1234.8,992.8 1230.5,1419.8 1234.0,1748.0 979.0,1750.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1234.0,619.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0839385,42.3680382]}},{"type":"Feature","properties":{"resourceCoords":[1234.0,1748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0844203,42.3660057]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p29","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0029","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"895.0,251.0 1524.7,256.4 1474.0,416.2 1379.3,627.0 1351.7,667.8 1293.0,786.2 1254.8,896.9 1226.2,1009.5 1061.0,1713.4 1051.6,1758.3 968.1,1758.3 630.2,1757.5 210.9,1751.8 208.7,1423.9 214.6,997.4 214.1,784.0 216.6,255.8 895.0,251.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[895.0,251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.082123,42.368501]}},{"type":"Feature","properties":{"resourceCoords":[210.0,1375.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.084265,42.3666855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0003","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1288.2,1620.3 356.6,1273.6 361.2,1191.3 252.2,827.7 378.1,632.2 718.9,488.1 904.2,316.9 1205.2,293.5 1294.5,291.9 1289.3,1379.5 1288.2,1620.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[856.0,299.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09842324647758,42.37471719543339]}},{"type":"Feature","properties":{"resourceCoords":[844.0,1450.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09976419002149,42.37286050639679]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0030","type":"ImageService3","width":1622,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"297.1,1746.6 306.4,1701.9 468.7,1001.4 496.8,889.2 534.4,779.0 592.5,661.0 619.9,620.4 713.4,410.6 763.4,251.4 1058.5,249.1 1313.7,255.3 1313.0,466.7 1321.9,659.1 1320.2,997.9 1315.7,1371.1 1323.1,1748.0 297.1,1746.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1053.0,255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.07987921217327,42.36819879883886]}},{"type":"Feature","properties":{"resourceCoords":[1326.0,1377.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.07968912114818,42.36607907985129]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0031","type":"ImageService3","width":1652,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1264.9,1766.9 1193.6,1733.9 1119.7,1713.4 157.4,1709.9 151.7,1325.5 158.2,944.9 161.6,599.5 153.5,403.2 155.2,187.6 852.0,180.6 852.2,120.9 1511.8,195.3 1511.0,267.8 1410.3,300.0 1442.3,802.7 1577.9,977.0 1569.7,1150.8 1559.9,1151.0 1414.3,1455.0 1264.9,1766.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[840.0,1323.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.07805398984783,42.365890443182934]}},{"type":"Feature","properties":{"resourceCoords":[840.0,567.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.07774610612591,42.36723508544203]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p32","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0032","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"128.9,1307.5 128.8,1292.7 154.2,1291.1 184.2,1281.1 212.6,1261.5 182.7,1245.6 72.2,1175.8 107.0,1123.9 145.1,1026.6 167.3,961.8 212.5,817.5 304.3,454.6 345.9,296.0 358.1,266.0 882.8,278.8 1365.4,289.2 1402.3,300.1 1437.8,317.3 1515.5,162.2 1591.2,11.1 1591.5,11.1 1596.2,11.1 1503.2,1433.4 1478.3,1444.7 1485.0,1489.2 1404.5,1509.0 1294.9,1662.0 1025.2,1710.3 965.5,1742.0 968.2,1809.9 815.2,1852.0 377.6,1868.6 273.8,1808.4 256.5,1809.1 273.8,1797.8 144.1,1598.0 128.9,1307.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0839015,42.3668722]}},{"type":"Feature","properties":{"resourceCoords":[1626.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0760757,42.3660005]}},{"type":"Feature","properties":{"resourceCoords":[1626.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.07748980000001,42.359069399999996]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.0853156,42.3599411]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0033","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"374.9,1831.4 347.4,1662.2 236.5,922.5 112.1,144.2 157.7,133.1 554.8,68.5 590.9,64.9 709.4,74.6 712.9,83.0 1348.1,279.2 1305.1,368.6 1662.0,221.2 1662.0,1085.4 1527.5,1181.7 1496.6,1176.7 1442.2,1181.2 1413.5,1183.6 1509.7,1855.3 957.7,1843.3 960.9,1849.8 380.3,1864.3 374.9,1831.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[245.0,984.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09178298416991,42.366302759417295]}},{"type":"Feature","properties":{"resourceCoords":[381.0,1843.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09262383413957,42.364835728658356]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0035","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.2,533.5 1.0,675.5 1.0,710.1 10.0,711.0 10.0,748.0 1.0,748.9 1.0,756.1 10.0,757.0 10.0,803.0 1.0,803.9 1.0,819.1 9.0,820.0 9.0,839.0 1.0,839.9 1.0,1024.2 17.0,1027.0 11.0,1071.0 1.0,1071.9 1.0,1078.0 17.0,1079.0 9.0,1121.0 1.0,1121.9 1.0,1127.0 13.0,1127.0 16.0,1131.0 15.0,1166.0 9.0,1170.0 16.0,1187.0 16.0,1203.0 1.0,1207.7 1.0,1233.0 10.0,1233.0 11.0,1239.0 19.0,1243.0 19.0,1261.0 1.0,1263.8 1.0,1287.0 11.0,1287.0 12.0,1296.0 20.0,1297.0 19.0,1314.0 2.0,1314.0 1.0,1310.5 1.0,1454.0 28.0,1455.0 27.0,1474.0 1.0,1474.0 1.0,1736.0 59.0,1735.4 254.9,1868.5 1245.0,1882.8 1507.6,1886.3 1581.2,1895.4 1610.4,1773.7 1613.9,1564.3 1610.5,1427.2 1594.4,1124.7 1513.3,379.1 1480.8,52.2 1482.3,1.0 1477.2,1.0 1402.4,15.5 1077.0,128.3 671.5,263.8 427.0,350.7 68.7,486.6 34.6,509.8 1.0,531.9 1.0,539.2 72.0,537.2 83.2,533.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[819.0,623.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08452970376214,42.365313270691644]}},{"type":"Feature","properties":{"resourceCoords":[1562.0,365.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08264677161512,42.36507235846148]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0036","type":"ImageService3","width":1625,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"623.4,1004.8 389.6,1010.0 240.7,869.2 233.6,678.7 162.3,681.3 382.1,74.2 994.7,330.5 1233.0,429.9 1296.9,465.1 1510.8,608.1 1568.8,641.0 1511.9,678.1 1452.4,696.3 1402.5,698.0 1401.8,727.2 1417.1,1299.8 1052.8,1523.6 979.5,1567.7 970.0,1573.3 856.5,1643.2 634.5,1381.5 631.3,1238.5 631.2,1237.2 623.4,1004.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[629.0,1017.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0862137957588,42.36180274144728]}},{"type":"Feature","properties":{"resourceCoords":[1017.0,1549.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08542471025689,42.36075102460106]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0037","type":"ImageService3","width":1639,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1225.7,1693.6 877.8,1719.6 574.6,1766.0 564.1,1753.7 398.4,1777.3 343.1,1697.3 231.8,327.3 229.1,324.6 1371.0,115.0 1437.3,460.6 1434.5,492.9 1415.7,687.2 1385.6,1097.4 1325.7,1689.6 1225.7,1693.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1392.0,1662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10859938359863,42.3683625875073]}},{"type":"Feature","properties":{"resourceCoords":[1392.0,110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10644380364558,42.37066297561172]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p38","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0038","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1404.5,257.0 1402.9,279.9 1401.1,1054.0 1408.2,1391.2 1407.7,1741.6 1236.3,1726.5 1043.8,1714.4 848.1,1696.2 681.1,1686.1 495.8,1687.9 334.6,1691.8 143.6,1702.1 193.9,1106.5 217.4,694.1 233.0,498.7 676.0,388.0 1206.7,294.0 1404.5,257.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1044.0,322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1050389,42.3694614]}},{"type":"Feature","properties":{"resourceCoords":[676.0,388.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.105859,42.36975]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p39","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0039","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1113.0,1803.2 691.0,1776.8 585.4,1770.7 198.2,1733.3 199.2,1389.7 192.6,1058.8 195.4,299.5 197.0,277.0 1293.2,84.3 1428.5,1059.5 1453.7,1281.1 1415.5,1818.6 1113.0,1803.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1372.0,652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1024078,42.3673706]}},{"type":"Feature","properties":{"resourceCoords":[197.0,277.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1042351,42.3691792]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p4","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0004","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1406.4,1613.4 962.2,1621.8 529.0,1614.7 165.6,1541.8 175.9,402.5 150.5,329.9 300.1,280.4 338.1,280.5 458.5,324.7 1396.8,661.6 1406.4,1613.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1405.0,1470.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0999069,42.3709032]}},{"type":"Feature","properties":{"resourceCoords":[958.0,504.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0997548,42.3728402]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p40","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0040","type":"ImageService3","width":1612,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1080.1,1862.2 378.9,1846.3 335.1,1845.3 353.2,1309.1 320.0,1089.5 149.5,124.4 558.1,36.0 611.3,316.2 1156.3,442.6 1179.0,567.0 1205.5,730.8 1234.0,864.0 1305.5,1284.8 1326.2,1361.2 1332.6,1867.6 1080.1,1862.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1179.0,567.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.100395,42.366499]}},{"type":"Feature","properties":{"resourceCoords":[1127.0,282.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.100064,42.366972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p41","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0041","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1297.6,1948.0 1163.8,1948.0 607.6,1789.0 254.1,1687.8 378.7,1186.7 377.9,1106.0 416.2,672.5 422.5,533.8 438.8,365.4 461.1,70.9 481.0,71.1 1264.7,77.8 1292.0,78.0 1292.5,627.4 1289.0,1411.8 1282.8,1410.0 1293.1,1784.5 1297.6,1948.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1292.0,365.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0984781,42.3658987]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0982045,42.366375]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p42","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"17"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0042","type":"ImageService3","width":1603,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.2,999.1 318.3,458.4 370.6,93.3 612.6,125.2 809.7,169.2 1299.1,296.4 1305.0,331.9 1302.4,781.1 1296.4,1500.5 1305.8,1618.4 957.6,1686.7 591.1,1753.5 338.3,1807.5 310.6,1851.5 127.2,1770.7 241.2,999.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[600.0,1049.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0979075,42.3652089]}},{"type":"Feature","properties":{"resourceCoords":[954.0,206.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0965379,42.3665221]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0043","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"328.1,134.4 656.0,216.8 904.5,274.4 1248.9,359.6 1594.7,457.3 1590.3,493.4 1471.7,1489.7 1482.3,1569.1 242.8,1790.1 230.7,1731.2 186.6,1418.5 175.0,1300.8 167.6,581.4 161.9,132.2 155.3,96.8 328.1,134.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[159.0,867.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09628524452447,42.36485855546964]}},{"type":"Feature","properties":{"resourceCoords":[1607.0,423.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09256915608678,42.36491336228039]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0044","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1199.8,1090.0 845.9,1828.2 605.9,1780.0 547.0,1801.3 525.5,1692.2 493.9,1614.0 312.3,1250.3 280.1,1176.8 117.6,184.9 117.2,182.3 704.9,167.0 701.5,160.5 1260.3,172.1 1238.8,23.0 1278.1,23.0 1416.5,706.9 1370.0,729.8 1319.7,1015.0 1199.8,1090.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[194.0,725.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0931981172338,42.36389653061946]}},{"type":"Feature","properties":{"resourceCoords":[283.0,1246.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09368945128425,42.363011482901946]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0045","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1606.5,1671.9 1547.8,1618.1 1509.0,1550.8 1276.5,995.0 1241.5,929.1 1498.0,821.0 1594.4,779.5 1579.1,139.3 1272.5,131.7 1084.3,1.0 763.0,1.0 764.0,18.0 700.0,24.0 560.0,24.0 424.4,19.2 280.1,109.4 249.7,102.5 239.4,102.8 195.5,103.6 174.9,104.0 166.8,104.2 206.9,606.7 208.8,629.4 247.3,631.9 340.5,1311.3 293.6,1330.8 226.5,1607.5 245.9,1597.0 308.1,1696.6 426.7,1715.8 568.5,1639.2 853.8,1643.4 1055.5,1800.9 1296.7,1862.1 1641.0,1712.8 1606.5,1671.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[634.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08985268243924,42.362685228796984]}},{"type":"Feature","properties":{"resourceCoords":[3227.0,169.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08295270883872,42.36207715115302]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p46","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0046","type":"ImageService3","width":1671,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1444.8,1813.2 158.6,1830.5 103.2,1387.2 162.3,851.4 128.8,832.5 129.5,774.1 137.0,695.0 167.2,623.6 469.4,103.3 500.7,35.6 741.5,174.7 894.1,261.1 801.3,425.5 854.0,621.6 1053.8,738.5 939.9,938.7 867.9,1062.1 919.4,1398.0 1051.3,1398.0 1147.0,1399.0 1570.5,1399.2 1569.8,1863.9 1529.6,1863.8 1444.8,1813.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1147.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0853293,42.3607889]}},{"type":"Feature","properties":{"resourceCoords":[121.0,1399.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0876593,42.3600049]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p47","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0047","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"534.4,1181.4 296.5,1032.2 120.2,917.0 174.8,722.2 275.9,361.2 281.2,364.7 450.8,474.1 485.3,434.6 745.0,421.1 1120.0,412.6 1477.0,399.8 1465.4,717.5 1467.0,778.0 1470.0,1155.8 1464.7,1510.8 1467.0,1679.0 1462.0,1784.9 1165.9,1605.3 1169.5,1594.5 534.4,1181.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1467.0,778.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0967081,42.3632071]}},{"type":"Feature","properties":{"resourceCoords":[149.0,778.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0999052,42.3634468]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0048","type":"ImageService3","width":1671,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1574.6,1221.2 1324.5,1485.5 898.3,1782.4 928.7,1866.9 544.9,1612.2 481.5,1575.8 296.1,1449.9 121.0,1335.7 126.2,1230.5 124.0,1063.3 129.7,710.8 127.1,335.5 1385.8,336.8 1387.8,742.4 1381.5,826.4 1352.5,933.5 1414.7,940.4 1608.2,1089.5 1574.6,1221.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[129.0,706.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09679423439134,42.362538142515234]}},{"type":"Feature","properties":{"resourceCoords":[719.0,348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09526551802873,42.36307731180781]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0049","type":"ImageService3","width":1638,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1420.5,1168.1 1359.4,1168.4 945.5,1408.1 948.6,1477.8 692.8,1497.3 624.4,1511.0 485.2,1531.2 93.7,1613.4 366.2,1456.1 315.4,1373.7 371.6,1286.9 273.9,522.5 234.9,478.8 534.5,425.6 878.9,391.6 978.0,385.2 1166.6,373.7 1325.8,368.6 1482.5,365.9 1446.5,812.5 1464.1,812.5 1456.1,1167.9 1420.5,1168.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[683.0,1179.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11050666257952,42.367539141616234]}},{"type":"Feature","properties":{"resourceCoords":[943.0,820.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10946978714941,42.36778841282566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0005","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1418.0,327.0 1403.1,345.6 1393.7,364.9 1404.9,544.5 1439.9,976.5 1440.5,1065.8 1429.8,1277.5 1425.1,1549.0 1414.9,1815.6 734.1,1716.6 733.2,1780.2 264.7,1761.3 360.8,673.8 346.6,668.4 390.2,465.6 602.0,376.9 1298.0,294.4 1347.2,228.6 1418.0,327.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[324.0,971.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09781909073354,42.37388530283896]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,1840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0961170109449,42.37164346028844]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0050","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"210.3,1140.0 222.8,785.5 205.2,785.2 246.7,340.1 272.9,340.0 437.4,350.8 630.2,369.6 819.9,382.5 988.7,398.3 1377.6,437.2 1483.7,443.7 1398.4,1256.0 1412.8,1395.3 1316.5,1482.0 1202.8,1584.3 1039.6,1731.0 747.2,1392.0 530.2,1144.1 275.4,1140.5 210.3,1140.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[778.0,801.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10732834184334,42.36663371966579]}},{"type":"Feature","properties":{"resourceCoords":[1041.0,1724.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10811584526273,42.364985298298045]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p51","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0051","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"438.7,1808.8 456.5,1380.7 420.3,1344.6 393.0,1317.0 483.3,1224.6 459.9,1086.8 492.5,272.7 916.2,273.5 1219.8,270.4 1242.6,270.4 1189.0,663.0 1235.0,663.0 1235.9,1020.8 1235.0,1702.0 772.7,1701.9 565.8,1693.3 467.2,1890.0 438.7,1808.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1235.0,1702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1061998,42.3635401]}},{"type":"Feature","properties":{"resourceCoords":[1235.0,663.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1045824,42.3650135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p52","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0052","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"424.4,1016.9 422.2,659.0 376.2,659.2 428.6,266.3 449.9,266.2 1156.1,263.1 1155.3,624.1 1159.0,1019.0 1159.8,1696.4 425.6,1698.2 424.4,1016.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1159.0,1019.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1037349,42.3636538]}},{"type":"Feature","properties":{"resourceCoords":[1159.0,1381.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1043006,42.3631419]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p53","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0053","type":"ImageService3","width":1640,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1229.2,1773.6 1029.4,1770.7 482.4,1767.1 482.3,1638.2 486.9,959.3 486.2,563.5 489.9,201.7 744.7,202.2 1108.6,203.4 1138.0,602.1 1170.8,966.6 1191.1,1292.2 1224.1,1682.8 1229.2,1773.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[671.0,1323.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1039427,42.3629273]}},{"type":"Feature","properties":{"resourceCoords":[1208.0,204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1011828,42.3639033]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p54","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0054","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1213.2,1695.4 812.6,1708.4 762.6,1691.1 702.8,1701.2 436.9,1702.0 400.0,1312.7 376.4,988.2 340.0,625.0 306.7,227.6 877.7,223.4 1004.5,186.2 1016.2,222.5 1223.9,221.0 1233.0,286.4 1237.7,645.7 1244.8,943.2 1248.1,1464.7 1254.0,1708.5 1213.2,1695.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[408.0,228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10117983847478,42.36389961329576]}},{"type":"Feature","properties":{"resourceCoords":[379.0,1337.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10297393106893,42.36236765984625]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0055","type":"ImageService3","width":1640,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"833.9,1690.5 420.4,1686.2 379.3,1672.6 377.1,1429.8 381.7,910.3 379.2,613.9 380.0,256.0 371.9,190.7 647.8,187.7 1392.4,192.0 1408.0,265.7 1211.6,782.6 1146.3,948.2 994.6,1359.3 865.8,1693.2 833.9,1690.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[387.0,952.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10075662017509,42.36185480390717]}},{"type":"Feature","properties":{"resourceCoords":[675.0,1674.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10131244511724,42.36049022857043]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p56","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0056","type":"ImageService3","width":1603,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"825.3,1829.6 816.2,1859.0 378.6,1848.5 324.9,1848.2 5.0,1847.0 12.4,1805.6 123.4,1515.8 259.5,1180.8 420.0,768.0 489.0,601.8 696.6,83.0 684.2,19.4 988.0,17.0 1028.6,16.6 1078.0,17.8 1087.3,18.0 1237.6,21.6 1461.4,31.0 1534.5,28.6 1506.7,85.7 1445.6,248.3 1304.7,598.8 1088.2,1148.7 970.9,1434.5 863.8,1724.2 825.3,1829.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[420.0,768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0992764,42.3609938]}},{"type":"Feature","properties":{"resourceCoords":[5.0,1847.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1016971,42.3598989]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0057","type":"ImageService3","width":1640,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"258.4,1760.3 348.9,1468.3 449.9,1179.6 634.8,624.6 643.9,598.2 755.7,270.8 807.5,106.8 832.0,48.9 1287.7,39.1 1388.4,110.7 1337.9,357.4 946.8,1689.5 987.4,1838.9 881.1,1929.8 887.6,1901.2 911.2,1818.5 380.0,1857.6 376.4,1874.9 233.2,1842.3 258.4,1760.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[251.0,1871.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10003296957457,42.3589820230489]}},{"type":"Feature","properties":{"resourceCoords":[1402.0,73.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09496504001159,42.36011490868302]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0058","type":"ImageService3","width":1671,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1190.8,1217.0 1009.1,1803.8 984.8,1885.7 593.8,1819.1 592.1,1826.1 299.9,1814.4 338.6,1757.7 260.4,1803.1 174.0,1799.4 102.5,1772.0 96.2,1771.9 334.6,315.2 363.2,314.6 796.5,313.2 804.6,284.0 812.6,259.9 954.8,296.3 958.9,279.1 1490.8,253.9 1465.0,336.0 1343.6,739.4 1317.9,821.8 1190.8,1217.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[797.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1001253775232,42.35899280003191]}},{"type":"Feature","properties":{"resourceCoords":[339.0,1766.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10328607710697,42.35744564095002]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0059","type":"ImageService3","width":1640,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"719.9,1889.4 204.0,1878.0 195.3,1931.6 52.1,1754.3 116.0,1752.9 154.1,1315.4 81.6,1171.7 55.2,771.3 104.3,552.5 178.8,494.1 198.8,144.2 347.0,34.8 661.9,95.5 1257.8,63.0 1451.9,131.5 1461.9,130.0 1394.9,628.5 1348.2,955.1 1334.8,1076.3 1319.0,1136.7 1123.5,1695.3 1105.2,1760.2 1096.5,1890.5 719.9,1889.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[686.0,1861.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1149006174232,42.3644466971234]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11351054395166,42.367707595405896]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0006","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.6,1875.1 477.6,1866.8 826.0,1873.7 1071.0,1873.2 1536.2,1872.4 1536.0,1927.8 1571.6,1927.3 1620.0,1791.8 1620.0,966.0 1611.0,965.0 1611.0,940.0 1620.0,939.0 1620.0,924.0 1609.0,923.0 1609.7,877.6 1589.8,796.7 1542.0,796.0 1541.0,768.0 1561.0,767.0 1562.0,763.0 1564.4,762.6 1575.0,749.0 1578.0,749.0 1565.4,698.0 1522.2,708.1 1509.0,626.9 1554.6,605.1 1534.4,562.4 1498.5,579.6 1359.2,1.0 1243.0,1.0 1209.1,42.0 581.1,41.6 67.2,155.4 3.1,242.8 75.7,341.9 60.7,360.9 51.3,380.5 64.1,562.1 103.0,999.1 104.3,1089.6 95.2,1303.9 92.6,1578.8 83.6,1875.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09446816541279,42.37116963519898]}},{"type":"Feature","properties":{"resourceCoords":[1524.0,2273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09332477586287,42.369978440915155]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p60","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0060","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"162.9,1859.0 121.1,1858.1 129.1,1729.2 146.9,1664.9 337.4,1111.3 352.7,1051.5 365.2,931.6 409.8,608.3 473.5,114.9 599.5,95.2 912.2,272.2 947.2,280.1 1287.8,483.4 1402.8,562.2 1388.1,947.8 1387.0,1859.0 162.9,1859.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[444.0,1859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1130959,42.36455]}},{"type":"Feature","properties":{"resourceCoords":[1387.0,1859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1107719,42.3647494]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p61","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0061","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.6,706.1 225.4,313.9 286.0,349.7 491.1,507.4 535.6,453.0 1007.7,552.0 1053.7,593.0 1129.8,660.5 1321.0,833.0 1321.0,1165.9 1317.5,1618.3 226.8,1632.8 215.6,706.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[590.0,1628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1098917,42.364825]}},{"type":"Feature","properties":{"resourceCoords":[1321.0,833.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.108316,42.366385]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0062","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"841.0,1606.7 237.7,1061.7 966.0,257.0 1114.1,93.4 1181.7,18.8 1213.0,18.7 1259.4,18.5 1283.8,41.0 1282.3,472.9 1314.2,553.5 1250.2,694.4 1296.1,695.3 1287.6,818.5 1293.7,1263.2 1291.0,1841.2 1130.3,1832.2 910.5,1812.8 758.7,1790.8 841.0,1606.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1286.0,711.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10827226476519,42.363975716727694]}},{"type":"Feature","properties":{"resourceCoords":[1286.0,1615.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10973303235582,42.362744064307705]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p63","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"21"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0063","type":"ImageService3","width":1635,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"557.8,147.1 765.2,156.8 1228.9,159.6 1218.5,1654.8 1217.6,1784.5 375.1,1765.7 378.6,1622.9 406.5,1048.3 419.8,606.0 433.7,483.9 388.0,481.0 457.8,343.7 557.8,147.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1221.0,1291.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1079586,42.3619421]}},{"type":"Feature","properties":{"resourceCoords":[388.0,481.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1083116,42.3640411]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p64","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0064","type":"ImageService3","width":1602,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"425.1,120.5 1164.9,121.6 1165.5,251.2 1163.9,454.8 1163.5,1622.2 422.0,1623.0 425.1,120.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1165.0,980.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1061163,42.3614864]}},{"type":"Feature","properties":{"resourceCoords":[422.0,1623.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1085241,42.3614283]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0065","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"422.4,1880.6 411.7,1508.5 399.0,331.3 398.2,126.0 952.9,121.3 1155.5,121.2 1172.7,402.2 1185.5,546.9 1185.2,660.4 1222.3,1871.7 422.4,1880.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[405.0,767.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10597248106588,42.36161740300604]}},{"type":"Feature","properties":{"resourceCoords":[405.0,324.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10528539307354,42.36223020842869]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0066","type":"ImageService3","width":1676,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1630.6,420.4 1393.2,1902.0 1391.0,1902.0 806.1,1903.9 130.5,1905.6 102.2,698.8 103.3,585.6 91.6,441.5 76.5,161.5 70.6,69.8 339.8,69.8 400.5,59.6 451.1,77.3 856.7,65.1 898.0,78.4 940.0,91.7 1360.4,90.7 1392.9,93.0 1290.2,387.8 1284.0,429.7 1605.6,421.1 1630.6,420.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[857.0,1879.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10474122763883,42.3583611947995]}},{"type":"Feature","properties":{"resourceCoords":[857.0,78.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10196150106516,42.36087707400509]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0067","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"256.9,1713.3 266.1,1502.2 110.3,1014.4 144.5,783.5 219.6,723.9 228.8,118.8 270.6,117.7 416.5,296.2 425.0,241.9 947.0,250.4 1328.1,249.2 1329.7,534.7 1335.8,829.8 1334.9,1492.7 488.0,1754.7 347.9,1799.3 286.0,1812.2 285.6,1750.4 216.5,1742.4 256.9,1713.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1337.0,628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11376516098927,42.36381080383142]}},{"type":"Feature","properties":{"resourceCoords":[440.0,255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11603011119075,42.36429059656784]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p68","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0068","type":"ImageService3","width":1600,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1423.8,1091.8 1232.2,1151.8 148.8,1491.0 158.0,838.1 155.7,547.5 157.7,266.4 199.8,267.8 1432.8,282.6 1423.8,1091.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[802.0,275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1123153,42.364617]}},{"type":"Feature","properties":{"resourceCoords":[976.0,1232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1115903,42.3629299]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p69","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0069","type":"ImageService3","width":1624,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1171.4,1868.2 1087.4,1849.8 923.4,1764.9 521.2,1404.0 289.6,1181.7 758.1,134.4 910.9,156.5 1132.1,176.2 1293.7,185.3 1296.5,329.7 1292.7,671.4 1296.2,1043.3 1292.8,1427.2 1302.7,1865.9 1171.4,1868.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[506.0,698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1123566,42.3626696]}},{"type":"Feature","properties":{"resourceCoords":[1293.0,1397.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1120357,42.3607891]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0007","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"582.5,1664.5 559.8,1714.5 1058.5,1874.7 1061.0,1869.0 1452.0,1942.4 1569.5,1172.6 1465.5,1152.6 1453.9,1150.5 1542.0,705.5 1601.5,418.2 1607.0,376.9 1600.3,376.6 1471.2,46.3 225.7,26.5 41.2,118.1 145.8,164.8 37.4,748.0 77.0,747.0 78.0,794.0 27.6,795.3 6.8,874.5 50.1,882.8 38.1,933.0 18.1,943.7 1.0,966.1 1.0,967.9 32.2,982.3 1.0,1155.4 1.0,1948.0 171.5,1948.0 582.5,1664.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1247.0,649.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.08880327010998,42.37301177082372]}},{"type":"Feature","properties":{"resourceCoords":[487.0,963.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.09065101621115,42.37242225601567]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0070","type":"ImageService3","width":1637,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"162.6,1623.7 100.0,1446.9 97.5,789.0 146.3,343.5 195.6,308.0 263.6,315.4 264.4,375.8 325.1,362.9 462.5,318.6 1293.0,58.6 1286.2,373.4 1292.7,903.2 1340.6,1078.1 1383.4,1150.9 1472.8,1244.3 1108.6,1602.1 971.0,1732.0 891.0,1749.9 837.4,1800.9 797.1,1759.7 304.3,1811.7 257.4,1803.8 149.4,1743.8 162.6,1623.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.11671757578648,42.362119873644346]}},{"type":"Feature","properties":{"resourceCoords":[1637.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.11270163370497,42.36244667065984]}},{"type":"Feature","properties":{"resourceCoords":[1637.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.11217876659943,42.35888871508353]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.11619470868094,42.358561918068034]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p71","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0071","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"347.7,1358.3 363.6,974.7 372.2,602.7 387.0,261.3 1239.0,271.0 1241.6,960.4 1239.0,1313.0 1243.4,1426.4 1243.8,1799.5 822.0,1790.3 784.2,1787.1 343.3,1797.2 347.7,1358.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[614.0,1791.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.112251,42.359842]}},{"type":"Feature","properties":{"resourceCoords":[1239.0,271.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1087257,42.3612451]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p72","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0072","type":"ImageService3","width":1630,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"458.3,165.7 1193.0,175.0 1194.5,540.7 1187.6,856.0 1188.8,1787.9 1132.7,1787.3 431.4,1799.8 438.2,1432.4 436.1,1320.7 445.5,973.6 456.3,294.9 458.3,165.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[854.0,1792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.110244,42.3586446]}},{"type":"Feature","properties":{"resourceCoords":[1193.0,175.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10711,42.360584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p73","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0073","type":"ImageService3","width":1631,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"387.2,1320.5 394.7,377.8 404.7,58.9 1199.6,77.2 1198.3,439.9 1200.6,479.4 1197.0,778.6 1195.6,1193.3 1197.1,1366.3 1194.0,1834.8 981.1,1843.3 385.9,1837.4 387.2,1320.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1197.0,807.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1072518,42.3581117]}},{"type":"Feature","properties":{"resourceCoords":[1197.0,1323.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1080232,42.3573737]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p74","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0074","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"715.0,1849.7 529.0,1851.0 530.9,1384.8 529.0,1212.8 529.3,800.1 532.3,502.4 529.9,463.1 530.3,102.2 1201.0,117.0 1190.9,1855.6 715.0,1849.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[529.0,1851.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1087939,42.356645]}},{"type":"Feature","properties":{"resourceCoords":[1201.0,117.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1048759,42.3583844]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0075__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p75 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"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":"6524.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0075__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0075","type":"ImageService3","width":1631,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"97.6,1346.3 138.7,1395.2 162.7,1668.0 294.3,1801.5 457.4,1879.3 1218.5,1913.7 1496.9,1884.9 1574.6,1804.7 1574.4,1624.3 1554.4,51.6 1553.0,19.2 1132.0,15.0 1094.2,12.3 654.5,27.5 663.1,545.6 662.5,737.7 619.8,808.6 619.8,883.8 561.5,884.2 255.6,1280.9 217.1,1309.6 97.6,1346.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0075__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1546.0,943.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11254118208181,42.357842817066285]}},{"type":"Feature","properties":{"resourceCoords":[663.0,49.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.11278849592658,42.360102895361464]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p76","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0076","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"417.5,1659.8 425.5,109.2 424.7,77.2 1124.8,55.2 1181.0,55.0 1191.4,565.1 1190.2,883.2 1194.8,1270.3 1205.2,1640.8 1192.2,1641.2 1173.9,1836.6 1117.2,1766.7 666.4,1818.8 488.8,1763.5 414.6,1837.5 417.5,1659.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[421.0,986.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1125011,42.3578228]}},{"type":"Feature","properties":{"resourceCoords":[849.0,576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.111038,42.357913]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p77","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0077","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1157.4,1841.4 536.9,1835.6 449.1,1771.9 302.1,1801.9 74.9,1572.8 69.2,1444.7 33.3,1399.0 39.6,1341.0 57.0,1341.0 56.0,1296.0 44.5,1296.4 54.9,1201.6 68.0,1201.5 63.3,826.6 64.7,435.1 70.9,113.5 665.2,115.0 877.8,104.7 883.7,578.9 880.4,846.1 905.2,1110.5 955.4,1166.6 1086.7,1448.5 1159.9,1531.5 1248.6,1591.4 1275.6,1619.5 852.9,1630.9 854.6,1667.2 1295.7,1654.2 1391.3,1879.6 1157.4,1841.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[425.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1113131,42.3555998]}},{"type":"Feature","properties":{"resourceCoords":[65.0,625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1111466,42.3568122]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0078","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"353.2,94.4 820.6,97.9 865.5,99.7 1388.6,95.4 1423.2,86.9 1466.0,108.6 1131.4,1423.2 1235.1,1372.6 1358.7,1325.9 1249.4,1403.5 1239.4,1409.1 1567.8,1555.7 1371.6,1726.4 1150.7,1834.7 1036.0,1794.9 932.7,1875.9 672.5,1833.4 579.1,1612.8 147.5,1625.4 145.8,1589.9 559.4,1578.8 533.0,1551.3 446.2,1492.8 374.6,1411.5 246.2,1135.6 197.1,1080.7 173.0,822.0 176.2,560.5 170.6,96.6 353.2,94.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[829.0,102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10750538648625,42.355885712837896]}},{"type":"Feature","properties":{"resourceCoords":[161.0,102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1088211912149,42.356648108680304]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p79","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0079","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"671.0,113.4 679.4,113.8 750.2,142.7 836.4,148.3 915.4,104.7 875.5,160.4 1167.1,178.6 1168.9,171.6 1557.8,246.8 1540.3,301.1 1390.4,746.4 1086.5,1650.3 1056.0,1736.7 739.8,1818.2 735.3,1835.5 692.3,1813.3 657.4,1821.8 130.3,1823.0 85.0,1821.0 96.5,100.8 671.0,113.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[710.0,883.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1048614,42.3565596]}},{"type":"Feature","properties":{"resourceCoords":[85.0,1821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1075157,42.3559013]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0008","type":"ImageService3","width":1620,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"404.4,1730.0 342.2,1730.5 268.9,1731.2 92.3,1732.5 80.6,1732.8 80.8,1285.3 83.3,995.9 80.7,954.9 308.6,920.5 398.1,874.2 380.9,697.9 655.9,595.3 667.9,413.6 823.0,190.8 1027.7,280.6 1195.3,250.0 1293.4,127.4 1369.0,128.5 1326.5,143.8 1398.0,287.8 1440.9,728.7 1460.5,722.4 1540.5,1322.2 1516.5,1353.1 1519.2,1719.0 404.4,1730.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0008/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.08770568896163,42.37526291997971]}},{"type":"Feature","properties":{"resourceCoords":[1620.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.08377825365409,42.37472921653731]}},{"type":"Feature","properties":{"resourceCoords":[1620.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.08464128894587,42.37121382148011]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.08856872425342,42.37174752492251]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p80","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0080","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1565.3,585.3 1346.5,1104.7 1297.3,1538.2 1058.5,1745.8 780.7,1781.2 767.3,1802.2 409.3,1753.3 417.3,1745.1 500.9,1639.5 394.9,1719.3 309.1,1797.4 260.9,417.5 539.7,249.4 544.3,158.2 695.0,158.9 791.0,173.1 890.1,198.2 1049.5,252.8 1149.8,295.8 1339.5,400.4 1350.3,377.9 1539.3,547.0 1565.3,585.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[539.0,133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1052461858212,42.3550578323318]}},{"type":"Feature","properties":{"resourceCoords":[1435.0,324.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.10433300746529,42.35351212212979]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p82 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.02"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2283.6"},{"label":"split_canvas_w","value":"2792.0"},{"label":"split_canvas_h","value":"5512.4"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"697.0,1861.9 636.5,1799.9 675.7,1335.5 669.5,1145.3 636.8,1081.0 669.8,887.0 648.6,704.6 649.6,702.7 640.4,644.1 493.1,640.5 359.1,652.1 118.6,731.6 66.8,706.8 72.7,773.8 112.6,1052.8 122.7,1117.5 152.7,1331.3 214.0,1765.1 282.5,1753.4 327.2,1752.2 374.2,1755.6 451.0,1767.6 499.9,1779.1 594.5,1811.3 597.6,1800.3 697.0,1861.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[214.0,1765.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.1052895,42.3550229]}},{"type":"Feature","properties":{"resourceCoords":[660.0,643.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0987817,42.3553538]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p82 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.17"},{"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":"6572.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1208.1,1702.9 1248.0,1897.2 1293.4,1789.1 1530.8,1716.8 1591.1,1079.4 1530.4,207.1 1407.2,94.1 819.5,129.9 623.5,219.5 609.7,397.8 299.3,353.5 334.0,503.1 653.2,526.5 713.0,674.3 779.0,1708.3 1208.1,1702.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0082__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.09704926179691,42.35755230463525]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.09602411405962,42.355733369961854]}},{"type":"Feature","properties":{"resourceCoords":[1643.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.09892352870655,42.354828384125845]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-71.09994867644386,42.35664731879924]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Cambridge, Massachusetts | 1950 | sanborn03701_006 p9","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T11:20:44Z","modified":"2026-10-18T11:20:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0009","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"111.0,1685.0 110.8,1319.6 134.8,1289.0 77.2,831.4 79.0,823.0 78.0,803.0 73.7,802.9 59.4,689.2 358.0,595.1 528.5,460.9 611.8,297.2 955.8,259.6 1028.8,164.8 1024.3,53.6 1344.7,94.7 1373.2,77.6 1471.5,553.4 1287.3,470.4 1286.7,536.2 1461.2,614.7 1456.2,700.3 1453.3,929.1 1452.1,1684.1 111.0,1685.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764cm:g03701195001:03701_01_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1204.0,929.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0817853,42.372684]}},{"type":"Feature","properties":{"resourceCoords":[111.0,1685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.0847839,42.3716618]}}]}}]}