{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03873_001.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Waltham, Massachusetts | 1892 | mapsnap generated fit (2026-10-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-20"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"35"},{"label":"placed","value":"18"},{"label":"unplaced","value":"17"},{"label":"fit sources","value":"georef-snap 9, georef 9"},{"label":"key map","value":"none"},{"label":"split sheets","value":"11 sheet(s) cut into 27 panels"},{"label":"unplaced pages","value":"p11__2 (tier 4, 42.37329,-71.23785 +/-957m); p14__2 (tier 4, 42.37329,-71.23785 +/-957m); p15__2 (tier 4, 42.37329,-71.23785 +/-957m); p18__1 (tier 1, 42.35273,-71.22575 +/-127m); p18__2 (tier 4, 42.37329,-71.23785 +/-957m); p18__3 (tier 4, 42.37329,-71.23785 +/-957m); p18__4 (tier 4, 42.37329,-71.23785 +/-957m); p19__2 (tier 4, 42.37329,-71.23785 +/-957m); p19__3 (tier 1, 42.43320,-71.44962 +/-137m); p19__4 (tier 1, 42.37715,-71.22074 +/-126m); p1__1 (tier 4, 42.37329,-71.23785 +/-957m); p1__2 (tier 4, 42.37329,-71.23785 +/-957m); p2__2 (tier 1, 42.37584,-71.23498 +/-102m); p3__2 (tier 4, 42.37329,-71.23785 +/-957m); p5__2 (tier 4, 42.37329,-71.23785 +/-957m); p6__1 (tier 4, 42.37329,-71.23785 +/-957m); p6__3 (tier 4, 42.37329,-71.23785 +/-957m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0010","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"587.8,1912.0 561.9,1912.0 562.2,1871.2 496.9,1812.2 124.2,1794.5 23.4,711.5 123.3,120.1 379.9,34.5 660.3,44.0 661.2,74.4 1002.4,95.1 1002.4,70.0 1140.2,67.0 1529.5,51.6 1547.0,1063.3 1555.1,1060.0 1568.5,1545.3 1552.0,1543.0 1487.7,1606.3 1477.7,1590.9 1000.5,1820.9 1000.3,1873.2 917.1,1879.5 685.7,1908.3 587.8,1912.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1011.0,579.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24649545786458,42.37439780093091]}},{"type":"Feature","properties":{"resourceCoords":[1011.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.246505690768,42.37531657557151]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0011__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p11 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0011__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0011","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1521.5,1912.0 1542.7,1878.5 1537.0,640.6 1537.1,492.1 1570.2,491.8 1518.3,47.4 1219.1,64.7 1020.0,171.8 903.0,301.2 903.0,324.8 451.2,801.0 333.3,931.3 178.7,929.6 65.2,1128.4 66.6,1753.1 1519.3,1841.2 1521.5,1912.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0011__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[520.0,1792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.23972010193069,42.369869931766296]}},{"type":"Feature","properties":{"resourceCoords":[1535.0,1273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2370295981296,42.37057690893652]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p12","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0012","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"216.3,1.0 182.8,1.0 181.0,150.0 173.1,1401.0 172.9,1434.9 151.3,1434.6 151.3,1435.7 172.9,1435.9 170.5,1823.6 170.3,1843.7 697.5,1852.0 1032.4,1857.2 1420.2,1877.5 1448.1,1107.1 1459.1,916.1 1466.2,709.1 1471.7,432.0 1477.3,384.7 1546.2,397.1 1612.0,408.9 1612.0,384.9 1559.4,376.9 1499.2,124.4 859.5,171.9 805.9,96.8 685.3,81.6 411.8,151.7 316.4,37.1 221.3,48.6 216.3,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[177.0,786.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2370164,42.3705814]}},{"type":"Feature","properties":{"resourceCoords":[532.0,1064.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2362253,42.3699981]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p13","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0013","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1482.5,567.9 1511.1,1087.3 1540.4,1574.7 776.0,1625.3 586.1,1633.8 380.8,1647.8 106.2,1670.5 58.9,1669.7 64.1,1600.4 123.0,821.5 165.1,826.8 305.7,111.1 414.4,121.8 1110.0,215.0 1466.1,244.3 1467.8,291.6 1482.5,567.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1126.0,1087.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2328665,42.368871]}},{"type":"Feature","properties":{"resourceCoords":[770.0,1087.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2326707,42.3695109]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0014__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p14 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0014__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0014","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1573.4,1814.6 1589.2,506.1 1165.2,466.0 1021.5,466.0 986.5,449.1 1006.1,89.5 964.1,35.3 64.8,28.6 49.6,1559.5 28.2,1559.3 63.8,1811.7 112.6,1810.9 806.1,1823.5 1159.0,1812.0 1166.0,1858.2 1170.9,1887.2 1573.4,1814.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0014__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[813.0,1135.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2291021,42.3681084]}},{"type":"Feature","properties":{"resourceCoords":[469.0,514.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2273358,42.3683306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0015__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p15 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0015__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0015","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1571.3,1343.5 1402.2,974.4 1198.8,929.4 1146.2,929.1 1108.7,928.9 1106.5,928.9 1095.8,928.8 1095.8,928.8 1075.2,902.0 1071.1,51.6 516.4,23.1 520.6,1.0 111.2,1.0 108.8,244.3 104.3,759.0 102.5,1242.2 97.5,1624.1 102.0,1819.0 582.0,1822.2 581.9,1824.2 1361.5,1876.3 1361.3,1855.2 1531.4,1865.5 1571.3,1343.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0015__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[105.0,764.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.23309158197797,42.36817906707046]}},{"type":"Feature","properties":{"resourceCoords":[1362.0,1845.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2362829691666,42.366185760968385]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p16","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0016","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"77.0,737.6 25.1,219.2 11.6,84.8 492.8,50.9 492.8,53.0 1278.0,45.0 1276.2,23.9 1447.4,21.0 1487.4,99.1 1544.0,85.5 1563.8,43.4 1599.2,222.0 1609.8,1544.7 1555.5,1879.6 143.2,1859.3 69.3,1832.2 39.3,1644.7 42.4,753.0 57.2,739.8 77.0,737.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1278.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2363608,42.3661959]}},{"type":"Feature","properties":{"resourceCoords":[1132.0,1826.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.240619,42.3672295]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p17 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4010.8"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3641.2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1503.5,1032.5 1050.7,1034.5 967.4,1141.7 42.3,1057.6 42.1,1852.9 106.3,1905.8 836.6,1912.0 866.5,1912.0 1049.6,1859.0 1486.4,1907.6 1486.2,1912.0 1516.5,1912.0 1543.9,1572.2 1518.8,1571.7 1518.5,1434.2 1510.7,1045.6 1503.5,1032.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1020.0,1558.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24652864703536,42.376258905224965]}},{"type":"Feature","properties":{"resourceCoords":[1514.0,1558.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24649430996134,42.375346302278366]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p17 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.41"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"4266.4"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1468.6,45.0 1321.8,42.2 1285.9,92.4 261.4,25.7 80.2,72.5 46.7,152.2 33.4,756.0 118.0,825.8 47.9,864.9 73.8,985.0 866.8,1062.6 998.4,1047.9 1001.9,1002.3 1141.2,1004.6 1339.8,1007.8 1381.5,1008.5 1443.3,296.1 1502.0,295.6 1468.6,45.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0017__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[824.0,301.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.22954494358093,42.3710534199122]}},{"type":"Feature","properties":{"resourceCoords":[464.0,977.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.23087509965318,42.3721046961275]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0019__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p19 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.50"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3903.2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0019__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0019","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"651.7,51.9 322.4,87.8 61.9,228.8 73.4,949.5 934.3,962.6 991.8,598.3 1492.4,588.8 1553.9,510.9 1476.4,392.8 1612.0,163.2 1612.0,143.9 1104.6,108.9 1079.6,152.4 1007.2,118.2 800.5,32.2 722.1,1.0 681.2,1.0 651.7,51.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0019__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[936.0,414.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2464756,42.371435]}},{"type":"Feature","properties":{"resourceCoords":[299.0,756.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2474617,42.3702517]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p2 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.49"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"793.6,26.2 155.0,149.6 137.4,324.8 241.2,624.3 147.9,699.1 169.8,906.2 51.0,1012.6 53.0,1647.8 107.5,1685.3 86.1,1824.8 206.3,1869.8 722.8,1837.1 706.6,1477.8 824.2,1292.1 1488.8,1294.2 1570.6,942.1 1543.9,916.1 1528.6,153.4 1528.6,152.5 895.7,65.5 896.0,93.3 793.6,26.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1536.0,513.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.241518,42.3783479]}},{"type":"Feature","properties":{"resourceCoords":[911.0,893.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2423124,42.3795903]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0003__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p3 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0003__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1517.4,1221.8 1522.6,1221.6 1558.7,1220.4 1495.4,100.5 1462.2,100.7 686.9,105.0 660.0,104.7 660.0,131.8 693.2,140.0 666.7,736.0 660.0,736.2 660.0,739.0 529.7,739.0 242.5,745.2 44.3,902.5 89.8,1162.2 33.0,1423.8 64.0,1765.5 1.0,1779.4 1.0,1804.4 280.4,1765.4 516.3,1735.9 1097.1,1712.7 1097.2,1727.9 1481.8,1793.6 1517.4,1221.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0003__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1094.0,117.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24152774852647,42.37832241319008]}},{"type":"Feature","properties":{"resourceCoords":[1094.0,1693.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24188439367644,42.375421468920955]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p4","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"128.1,1885.7 70.6,794.6 39.1,794.6 136.7,169.8 109.1,169.6 177.3,69.5 180.8,88.9 525.0,108.9 896.6,33.7 1452.2,21.1 1547.9,55.5 1580.8,285.4 1496.5,794.0 1523.0,794.0 1513.7,1235.8 1508.8,1749.3 1604.5,1742.7 1612.0,1743.0 1610.2,1762.4 1597.2,1769.2 1538.5,1789.5 1174.5,1830.7 1048.0,1827.3 424.1,1874.9 168.3,1884.5 128.1,1885.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[763.0,1328.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2388708,42.3771635]}},{"type":"Feature","properties":{"resourceCoords":[1523.0,794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2368071,42.3780479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0005__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p5 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0005__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0005","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1569.3,1710.1 1570.3,1712.0 1528.1,1269.1 1586.6,950.8 1474.2,957.1 1414.6,972.4 1352.7,975.6 1140.0,232.0 1090.5,238.9 881.3,243.3 538.8,250.4 539.1,255.4 371.1,73.7 359.7,19.3 335.5,1.0 334.6,1.0 390.7,123.1 173.7,151.4 80.2,288.6 122.8,730.9 28.4,1313.0 82.2,1703.4 57.7,1706.3 576.3,1805.0 577.0,1777.8 1029.0,1798.0 1554.5,1815.4 1550.0,1717.3 1550.5,1709.7 1569.3,1710.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0005__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1029.0,1798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2369292,42.3772142]}},{"type":"Feature","properties":{"resourceCoords":[1140.0,232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2330261,42.3768256]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0006__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p6 [2]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.78"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0006__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0006","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"722.3,1856.3 1336.5,1880.5 1551.2,1856.2 1593.1,1775.6 1579.6,617.3 1435.1,289.1 1476.2,121.0 1406.0,59.0 880.2,27.0 749.1,166.2 439.9,232.3 366.7,263.3 343.6,263.0 311.9,262.6 100.7,385.3 105.6,386.1 38.8,717.5 1.0,904.6 1.0,968.7 16.9,967.9 450.7,964.9 605.4,966.1 620.3,1057.2 656.7,1057.8 655.4,1272.4 741.2,1798.0 708.0,1798.1 721.8,1859.3 722.3,1856.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0006__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1041.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2303968,42.3771322]}},{"type":"Feature","properties":{"resourceCoords":[-6.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2330261,42.3768256]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0007","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"71.4,246.1 70.6,184.8 82.0,124.4 848.7,93.0 855.5,53.5 871.8,92.3 1308.0,97.2 1463.5,101.1 1476.8,193.0 1513.5,194.2 1508.3,409.9 1585.0,939.9 1551.7,939.5 1564.4,1001.3 1521.6,1203.3 1593.7,1751.3 1527.2,1879.0 1387.4,1839.7 389.6,1883.8 154.0,1805.6 70.4,1864.2 49.8,1647.9 84.8,1618.0 42.7,1522.0 102.9,1305.2 40.5,868.9 57.1,358.4 51.2,355.8 71.4,246.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1315.0,99.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.23186254851247,42.37696579393458]}},{"type":"Feature","properties":{"resourceCoords":[95.0,929.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.23453596131742,42.375043588874895]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0008","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1439.5,1831.1 1445.5,1867.0 1250.5,1876.8 1089.1,1865.4 955.9,1839.6 691.7,1779.2 696.3,1818.6 33.2,1670.2 33.9,1665.0 43.4,1588.3 74.0,1327.5 124.2,687.7 147.6,560.0 163.2,184.6 151.8,122.0 488.5,144.7 1547.0,55.5 1593.0,131.7 1582.8,1687.7 1601.4,1692.0 1439.5,1831.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1088.0,472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.2375509777884,42.37442074924618]}},{"type":"Feature","properties":{"resourceCoords":[712.0,1789.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24090493117339,42.3749503575738]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Waltham, Massachusetts | 1892 | sanborn03873_001 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T00:40:39Z","modified":"2026-10-20T00:40:39Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0009","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.8,1784.6 52.1,1784.2 60.8,1784.6 66.0,1310.6 72.0,1075.3 135.0,503.4 149.9,505.5 271.0,138.8 374.7,161.1 369.9,122.1 632.0,179.7 764.3,204.2 924.3,214.1 1117.3,202.7 1111.1,167.2 1270.3,28.0 1480.5,73.7 1584.0,282.4 1584.5,1006.2 1531.5,1169.5 1586.0,1592.5 1536.4,1855.5 1056.8,1844.3 1059.7,1852.5 60.4,1819.0 60.8,1784.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764wm:g038731892:03873_1892-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[685.0,1273.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24374074583977,42.37427467917291]}},{"type":"Feature","properties":{"resourceCoords":[350.0,97.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-71.24082364957908,42.375028784252464]}}]}}]}