{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03836_004.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Salem, Massachusetts | 1957 | mapsnap generated fit (2026-10-24)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-24"},{"label":"run","value":"corpus-v2.2"},{"label":"pages","value":"104"},{"label":"placed","value":"79"},{"label":"unplaced","value":"25"},{"label":"fit sources","value":"georef-snap 43, georef 34, georef-street 1, snap:0 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"14 sheet(s) cut into 31 panels"},{"label":"unplaced pages","value":"p11__2 (tier 1, 42.54159,-70.88772 +/-107m); p20__1 (tier 1, 42.52411,-70.89462 +/-276m); p20__2 (tier 1, 42.51848,-70.89682 +/-100m); p21D (tier 1, 42.76830,-71.08326 +/-265m); p21E (tier 1, 42.52245,-70.88900 +/-275m); p22 (tier 1, 42.61690,-70.66139 +/-267m); p26 (tier 1, 42.51787,-70.89180 +/-281m); p34__2 (tier 1, 42.50639,-70.88920 +/-106m); p55__2 (tier 1, 42.62081,-70.94926 +/-104m); p65 (tier 1, 42.52465,-70.90643 +/-281m); p68__2 (tier 1, 42.51158,-70.88889 +/-192m); p72__2 (tier 1, 42.52727,-70.86811 +/-100m); p74__2 (tier 1, 42.50556,-70.88304 +/-100m); p75 (tier 1, 42.50027,-70.89642 +/-263m); p76__2 (tier 1, 42.50433,-70.89970 +/-281m); p77 (tier 1, 42.50931,-70.89508 +/-267m); p78 (tier 1, 42.52377,-70.88182 +/-241m); p79 (tier 1, 42.49628,-70.89657 +/-265m); p80__1 (tier 1, 42.52185,-70.90298 +/-100m); p80__2 (tier 1, 42.51244,-70.91516 +/-282m); p80__3 (tier 1, 42.50931,-70.91050 +/-100m); p80__4 (tier 1, 42.51868,-70.91619 +/-100m); p80__5 (tier 1, 42.51737,-70.91342 +/-100m); p81__2 (tier 1, 42.50890,-70.89064 +/-127m); p9__2 (tier 2, 42.51938,-70.88646 +/-1581m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p1","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0001","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1099.0,1133.0 915.0,1176.4 890.6,1182.0 891.8,1241.8 435.4,1232.9 388.9,1227.7 293.2,1229.4 107.7,1220.9 109.5,1219.8 112.5,1013.2 164.6,921.4 135.9,752.6 171.1,723.7 105.2,538.4 109.0,280.2 178.0,192.2 153.9,129.4 505.4,148.9 620.8,115.0 1048.6,182.3 1060.5,378.1 1090.5,377.0 1099.0,536.6 1099.0,564.9 1099.0,903.6 1092.5,903.9 1099.0,1010.6 1099.0,1133.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[880.0,651.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88755639766225,42.53416779983471]}},{"type":"Feature","properties":{"resourceCoords":[880.0,1230.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8883469589571,42.53264683717823]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0010","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"119.2,719.6 117.8,719.6 134.6,564.5 162.6,263.5 286.4,246.7 438.4,219.6 532.5,197.3 623.7,168.8 704.0,136.9 777.0,97.4 819.7,68.8 859.3,148.0 926.5,325.9 994.0,534.7 1020.5,635.8 1034.6,726.5 922.0,727.1 906.1,1187.1 737.6,1254.6 475.8,1256.3 96.2,1128.2 81.9,1171.5 119.2,719.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[873.0,722.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88343808450527,42.523032016044404]}},{"type":"Feature","properties":{"resourceCoords":[182.0,256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88660405612126,42.523119327683894]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0011__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p11 [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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0011__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0011","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"242.4,1109.5 330.7,1109.3 519.4,1128.3 735.7,1160.8 837.7,1182.0 925.0,1209.8 944.3,1160.9 1069.2,941.5 982.5,777.6 939.5,443.1 715.2,493.7 623.5,515.7 623.5,514.4 622.5,514.6 597.4,281.9 446.9,239.4 197.6,246.7 114.3,111.9 46.3,266.7 50.0,456.4 117.1,476.0 133.2,580.5 153.3,669.6 179.0,764.7 230.8,1035.8 242.4,1109.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0011__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[207.0,875.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88456572273837,42.525120487038436]}},{"type":"Feature","properties":{"resourceCoords":[953.0,875.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88214577711061,42.52401916293843]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p12","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.28"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0012","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"169.3,593.5 381.9,97.5 419.4,152.4 1092.1,211.3 1024.0,473.6 1070.1,1246.6 967.5,1248.9 969.0,1295.1 59.1,927.9 140.0,702.0 169.3,593.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[140.0,702.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8829074,42.5232602]}},{"type":"Feature","properties":{"resourceCoords":[29.0,1012.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8834046,42.5230299]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p13","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.26"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0013","type":"ImageService3","width":1100,"height":1363},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"211.5,1193.7 647.2,1282.8 860.1,1143.0 860.0,1147.7 924.8,1164.4 1007.8,735.7 982.9,731.6 990.0,703.0 1008.5,509.3 1013.5,396.4 1009.5,325.0 990.0,149.0 791.0,127.1 248.3,153.6 244.2,132.2 1.0,230.6 1.0,1073.8 106.5,1292.2 211.5,1193.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[990.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.892403,42.525507]}},{"type":"Feature","properties":{"resourceCoords":[990.0,149.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8911057,42.5267765]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p14","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0014","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"14.4,1133.6 1.0,1134.2 1.0,1337.0 44.0,1338.0 44.0,1356.0 36.0,1364.0 11.0,1365.0 10.0,1361.0 1.0,1361.0 1.0,1386.0 128.2,1386.0 156.4,1261.5 349.1,1386.0 914.6,1386.0 945.8,1188.3 908.0,1123.3 981.7,853.0 1051.1,628.1 1064.5,604.1 1097.5,621.5 1099.0,616.4 1099.0,1.0 945.4,1.0 972.1,87.5 885.4,213.8 847.7,210.7 135.4,104.5 156.8,173.6 179.6,285.7 208.9,480.4 209.0,510.2 234.4,508.1 258.0,949.3 190.3,948.8 189.3,944.1 14.4,1133.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[198.0,401.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8921922,42.5256727]}},{"type":"Feature","properties":{"resourceCoords":[852.0,1255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.893162,42.5227081]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0015","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"119.7,977.5 101.0,1037.5 13.5,377.4 136.6,433.8 267.1,357.6 297.4,356.4 480.3,362.5 473.4,275.2 458.5,192.4 760.0,182.3 915.6,179.4 947.6,531.8 950.0,589.0 966.9,779.9 968.3,795.5 985.3,996.3 981.2,1040.1 917.7,1032.3 775.9,1028.3 549.9,1025.9 344.1,1019.4 279.9,1013.7 259.9,1074.7 119.7,977.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[966.0,590.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8872227290098,42.521312242819064]}},{"type":"Feature","properties":{"resourceCoords":[67.0,1149.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89058573534587,42.522952521799]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p16","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.50"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0016","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"427.2,1071.0 303.3,1025.2 215.8,1001.8 122.0,971.0 129.3,928.2 127.7,729.3 127.7,728.7 127.5,713.9 125.2,524.6 127.1,468.2 122.0,119.0 122.0,117.6 568.3,132.2 877.5,217.9 1035.2,305.2 1054.5,700.9 665.5,1296.4 482.6,1257.0 509.2,1130.7 448.5,1072.8 427.2,1071.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[122.0,971.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8887572,42.5207468]}},{"type":"Feature","properties":{"resourceCoords":[122.0,119.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8858811,42.5219212]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p17","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0017","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"797.5,1311.4 801.5,1372.6 891.4,1149.7 1059.3,732.9 1016.1,629.8 1008.0,574.9 1049.5,387.5 1076.7,245.1 1081.3,199.1 1017.1,204.0 876.1,228.2 652.4,270.6 447.7,305.1 383.1,312.2 375.6,376.4 217.6,308.2 211.1,371.2 84.3,1.0 1.0,1.0 1.0,325.5 72.3,473.5 73.8,482.5 35.9,481.1 34.1,509.0 69.8,745.8 121.7,1026.2 185.1,1069.1 245.1,1268.1 580.5,1336.9 574.4,1332.7 788.5,1174.6 797.5,1311.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[55.0,488.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89071066673596,42.523344788563335]}},{"type":"Feature","properties":{"resourceCoords":[1063.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88877659000966,42.52079593541351]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p18 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"297.1,1219.8 732.5,1211.1 734.8,1247.7 736.6,1237.8 741.5,1211.0 748.1,1173.8 791.2,940.0 802.6,915.1 934.7,708.0 955.7,688.2 1004.0,691.4 1042.0,563.6 1038.6,563.0 1015.9,374.4 858.1,346.1 860.7,339.7 670.5,338.8 670.5,207.6 597.9,162.8 582.8,164.6 576.4,165.4 443.6,145.9 351.6,140.9 251.9,129.9 244.2,175.4 207.7,315.0 154.1,498.4 158.4,553.5 194.6,658.8 1.0,1059.5 1.0,1275.8 32.5,1268.1 268.1,1210.5 272.5,1210.9 296.1,1213.0 297.1,1219.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[253.0,849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89136536542438,42.52015227472877]}},{"type":"Feature","properties":{"resourceCoords":[244.0,144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88881709333194,42.520756254771705]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p18 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2682.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1718.0"},{"label":"split_canvas_h","value":"1363.2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1099.0,103.0 1099.0,65.1 675.2,52.4 682.5,119.3 687.2,175.7 688.5,211.9 690.4,256.1 865.1,299.5 896.8,306.4 1017.9,333.0 1044.2,338.8 1099.0,103.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0018__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1022.1,341.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8932601388837,42.51850862066772]}},{"type":"Feature","properties":{"resourceCoords":[701.5,263.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89340117168486,42.51945115983704]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0019","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1048.5,1064.3 1036.5,1180.1 1099.0,1177.1 1099.0,45.0 1067.9,1.0 553.6,1.0 470.9,55.3 396.4,79.8 408.4,66.8 134.4,139.2 72.4,1.0 39.8,1.0 128.8,202.6 78.5,226.3 208.1,561.4 235.2,560.5 214.1,721.1 192.3,866.0 181.3,968.1 192.7,1071.9 233.3,1081.1 531.7,1148.9 847.1,1221.0 897.0,1226.1 976.2,1226.6 977.2,1056.7 1048.5,1064.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[967.0,944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89596414066433,42.52312276898139]}},{"type":"Feature","properties":{"resourceCoords":[230.0,1101.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89862751300069,42.522476520968056]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p2","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.07"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0002","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"159.1,16.1 371.9,56.4 370.9,62.5 709.9,136.6 859.0,161.0 864.0,133.1 1047.3,161.6 1044.1,169.9 1078.0,999.2 1046.5,1214.9 65.4,1216.9 15.2,1128.2 30.9,779.0 46.5,780.7 132.9,360.5 165.0,374.0 159.1,16.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[165.0,374.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8860015,42.5325394]}},{"type":"Feature","properties":{"resourceCoords":[859.0,161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8864319,42.5346757]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021A/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21A","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021A/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021A","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"86.5,279.6 50.5,563.3 72.3,640.8 73.8,674.5 66.9,751.0 44.0,1005.6 244.2,1004.1 1009.1,1008.8 1065.7,1005.6 1056.5,923.6 1099.0,871.1 1099.0,1.0 955.4,1.0 989.7,339.2 831.5,355.2 731.0,355.7 86.5,279.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021A/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[46.0,1003.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8975659476356,42.52144622038714]}},{"type":"Feature","properties":{"resourceCoords":[1033.0,388.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89573609008372,42.52228825010932]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021B/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21B","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021B/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021B","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.0,134.2 988.5,138.8 1043.5,135.7 1080.7,223.2 1097.2,347.8 1099.0,576.6 1068.2,580.0 1099.0,859.7 1099.0,1133.6 1099.0,1211.2 1093.1,1283.3 922.3,1209.2 807.9,1197.5 628.0,1198.3 224.1,1169.7 73.5,1154.1 42.9,1152.5 48.6,955.1 48.5,946.5 47.9,825.8 38.2,615.4 22.8,136.4 50.3,135.7 245.0,134.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021B/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[71.0,133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8975301959504,42.52144650083395]}},{"type":"Feature","properties":{"resourceCoords":[1084.0,133.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89559716232964,42.521447736194695]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021C/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21C","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.37"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021C/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021C","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.8,730.3 81.0,731.8 74.2,860.0 66.3,980.5 679.5,1043.8 935.5,1037.1 1099.0,763.2 1099.0,1.0 161.9,1.0 131.4,174.6 81.8,217.6 77.0,296.0 98.0,386.6 92.7,509.4 91.9,524.4 55.8,730.2 56.8,730.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021C/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1041.0,1023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.893576,42.5206556]}},{"type":"Feature","properties":{"resourceCoords":[77.0,296.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8956743,42.5214439]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021F/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21F","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021F/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021F","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"749.6,1367.6 802.0,1247.8 825.3,1131.7 937.6,879.5 1026.6,662.3 1056.2,503.3 1057.0,418.9 1028.2,257.9 1002.9,145.9 966.4,1.0 907.5,1.0 456.0,154.8 393.4,176.2 377.9,1.0 262.2,1.0 188.3,196.3 177.8,76.0 171.2,1.0 1.0,1.0 1.0,296.5 239.7,450.7 237.3,711.2 150.9,1332.1 446.6,1367.2 546.9,1386.0 738.5,1386.0 749.6,1367.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021F/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[922.0,927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89439439242852,42.51952557536683]}},{"type":"Feature","properties":{"resourceCoords":[1075.0,465.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89346665920884,42.51945022799777]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2478.4"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"3069.6"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"214.0,780.7 225.3,858.6 228.0,1269.1 228.9,1296.8 553.8,1324.5 662.8,1301.2 941.1,1335.2 1017.3,655.7 519.0,702.5 200.6,731.8 214.0,780.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[519.0,702.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8986923,42.5218501]}},{"type":"Feature","properties":{"resourceCoords":[228.0,1269.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8976221,42.5214416]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p21 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"2478.4"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1082.7,579.1 1087.6,177.6 1078.0,101.2 1070.3,71.0 143.5,146.0 68.8,615.0 79.6,584.6 274.3,593.0 401.9,594.2 609.7,587.5 1082.7,579.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0021__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,588.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89760369106794,42.52143799024574]}},{"type":"Feature","properties":{"resourceCoords":[97.0,588.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8975748939765,42.52003755712191]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0023","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1055.0,824.4 1099.0,464.6 1096.6,431.6 1086.8,426.9 1077.2,330.4 1081.7,278.9 1084.5,128.2 1084.5,66.1 1083.8,1.0 1055.2,1.0 1055.2,141.7 1035.7,317.6 1028.8,353.4 947.4,306.9 890.8,294.6 800.6,285.1 600.0,248.5 525.6,232.3 525.2,236.8 290.6,175.9 286.0,483.1 274.4,483.1 281.4,654.5 294.3,863.1 316.6,1022.1 344.0,1203.9 419.0,1164.2 563.7,1081.6 688.1,1015.3 709.0,1011.6 703.3,1079.8 747.3,992.1 792.5,958.6 849.7,947.4 1021.9,989.8 1018.5,952.3 1062.1,967.1 1055.0,824.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[513.0,238.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89756867537238,42.51999079045421]}},{"type":"Feature","properties":{"resourceCoords":[807.0,678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8962769213431,42.51886041058012]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0024","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"45.8,997.2 53.5,1058.1 247.7,1088.3 428.9,1149.0 647.7,1304.1 1017.0,1298.7 1099.0,1301.1 1099.0,1294.4 1099.0,1288.2 1095.3,1259.6 1062.0,1000.1 1023.0,774.5 972.5,423.8 932.3,77.9 853.9,94.8 700.2,100.4 480.1,63.1 222.6,11.4 110.1,13.9 7.7,1.0 1.0,1.0 1.0,738.4 45.8,997.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[945.0,111.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8933625732691,42.519439338123874]}},{"type":"Feature","properties":{"resourceCoords":[1105.0,1311.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89306612537305,42.51765327714548]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p25","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0025","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"545.7,1139.4 545.7,1139.7 545.7,1140.2 523.8,1142.7 387.1,1163.6 268.4,1187.1 228.5,930.6 218.5,866.6 182.9,632.8 185.5,605.6 242.3,367.8 255.7,342.4 302.1,329.6 296.3,197.1 526.9,163.4 853.6,154.0 871.7,455.1 890.1,577.0 911.0,695.0 981.2,1066.7 545.7,1139.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[532.0,761.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8916303,42.5176695]}},{"type":"Feature","properties":{"resourceCoords":[911.0,695.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.891429,42.516598]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p27","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0027","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.0,238.1 485.0,232.0 605.0,231.4 728.6,234.0 1029.0,267.4 983.2,614.1 976.7,680.9 975.1,771.5 981.7,864.8 918.2,872.0 1077.2,1133.6 1077.1,1134.9 518.9,1075.3 515.1,1049.7 107.8,1045.5 106.8,589.2 102.8,315.9 106.0,238.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[337.0,919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8916334,42.5146317]}},{"type":"Feature","properties":{"resourceCoords":[485.0,232.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.891429,42.516598]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p28","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0028","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"181.1,166.6 597.5,191.2 777.6,87.5 805.2,428.4 961.4,433.4 1051.5,391.1 1050.0,1039.5 969.5,1039.3 931.4,1124.4 822.5,1128.8 775.1,1185.5 604.6,1227.7 330.1,1189.2 331.7,1261.8 142.2,1027.3 203.2,1012.0 184.6,921.9 174.3,833.2 171.9,767.1 171.2,422.8 181.1,166.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[605.0,768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.887678,42.5157252]}},{"type":"Feature","properties":{"resourceCoords":[605.0,199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8876831,42.517347]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0029","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"440.3,1110.0 364.2,1086.9 219.4,1047.9 138.1,995.7 110.0,948.0 104.8,890.8 164.2,726.6 127.2,726.0 146.2,684.9 178.2,688.2 216.5,592.5 268.8,507.2 373.8,413.8 414.6,224.6 425.7,182.2 861.8,219.5 938.3,228.9 917.2,436.1 909.5,429.9 999.4,1076.3 1043.5,1092.3 1099.0,1113.5 1099.0,1138.5 440.3,1110.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[937.0,199.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89271609642132,42.51624128881683]}},{"type":"Feature","properties":{"resourceCoords":[760.0,982.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89580524540743,42.516255378423594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p3","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0003","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"801.0,1238.4 376.1,1238.0 374.6,1251.2 98.0,1079.3 200.9,880.9 174.6,720.9 255.4,342.9 184.2,157.8 133.8,160.3 121.8,97.9 209.1,46.6 395.9,59.5 492.4,60.0 539.2,66.4 999.1,86.0 1003.0,379.0 1009.6,561.5 1010.5,698.9 1014.5,1028.6 1020.1,1240.7 801.0,1238.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[801.0,1239.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8904939,42.5297604]}},{"type":"Feature","properties":{"resourceCoords":[1003.0,379.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8886799,42.5318305]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p30","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0030","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"333.1,1011.0 331.7,986.1 272.8,969.8 226.9,957.9 75.2,315.7 83.6,321.2 85.2,110.6 358.4,103.0 814.8,95.9 977.2,93.4 986.5,722.7 957.6,1131.3 664.9,1092.3 663.1,1074.3 408.0,1007.1 333.1,1011.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[90.0,330.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89365397059466,42.51613088247995]}},{"type":"Feature","properties":{"resourceCoords":[984.0,721.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89471590151744,42.51350764903249]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p31","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0031","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.2,676.6 254.6,48.2 939.5,59.2 931.5,723.3 927.9,976.5 925.9,1235.0 845.2,1260.5 202.4,1083.6 244.2,676.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[931.0,422.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89336092027986,42.51170278784282]}},{"type":"Feature","properties":{"resourceCoords":[253.0,695.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89478504225077,42.513467497149854]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0032","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"91.8,1001.9 89.4,317.8 88.8,155.8 495.2,159.3 499.0,184.9 1056.0,243.5 1040.8,378.9 1078.5,708.3 1044.7,887.6 1078.5,959.9 1099.0,958.0 1099.0,962.0 1099.0,982.6 1007.3,1098.4 445.6,1193.9 170.8,1240.1 92.6,1243.6 91.8,1001.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[85.0,155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89244779240691,42.51419355029743]}},{"type":"Feature","properties":{"resourceCoords":[85.0,1254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89188623664076,42.51112983266042]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p33","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0033","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"977.0,165.2 963.4,413.3 935.6,918.3 938.6,1023.4 926.3,1222.1 570.5,1180.7 327.3,1245.6 146.7,1190.8 159.2,932.3 173.1,679.0 208.2,14.8 450.3,28.6 987.3,59.1 977.0,165.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[183.0,726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89466352918141,42.5115190615616]}},{"type":"Feature","properties":{"resourceCoords":[950.0,1130.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89560768173936,42.50918880429078]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0034__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p34 [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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0034__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0034","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"779.3,919.6 802.8,771.4 823.1,640.5 833.1,580.5 830.7,580.1 860.4,347.4 859.4,347.2 844.3,345.0 829.1,378.4 696.7,333.0 517.9,91.8 353.4,51.9 156.5,52.4 72.2,97.4 69.2,140.9 93.7,144.9 193.8,254.7 197.9,828.1 199.4,1108.6 190.3,1186.8 723.5,1271.7 758.0,1065.8 779.3,919.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0034__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[197.0,822.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89053205892286,42.51144066767341]}},{"type":"Feature","properties":{"resourceCoords":[771.0,927.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89027889160013,42.50982036026489]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p35","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0035","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.7,898.8 139.2,661.3 139.0,432.6 240.3,432.1 240.0,163.0 488.8,162.8 595.4,167.3 803.6,169.4 951.0,167.7 952.0,417.3 946.0,1138.5 594.0,1133.8 343.0,1130.0 135.3,1130.2 134.7,898.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[240.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8929217,42.5095408]}},{"type":"Feature","properties":{"resourceCoords":[343.0,1130.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8920239,42.5068973]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p36","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0036","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.2,412.6 73.5,172.8 73.6,164.9 222.1,166.6 347.0,167.6 353.2,167.7 413.4,168.7 413.4,166.3 645.5,161.9 645.5,145.8 856.1,206.5 863.9,507.1 902.8,633.8 1010.8,654.8 1016.5,873.0 1009.5,920.3 844.3,958.2 664.2,1095.3 658.1,1136.1 589.0,1131.4 588.8,1137.0 298.3,1129.6 58.9,1128.0 72.2,412.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[138.0,1129.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8894488,42.5071386]}},{"type":"Feature","properties":{"resourceCoords":[304.0,652.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.889092,42.5085407]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0037","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"93.1,1163.1 137.7,1170.0 154.7,1123.8 350.0,1154.2 446.0,1227.6 708.9,1263.5 715.7,1372.8 912.6,996.4 937.3,844.1 947.8,755.2 986.7,492.5 1005.9,381.7 990.4,381.7 909.9,137.8 847.0,152.9 813.9,240.5 711.6,239.3 404.4,206.2 179.7,112.8 149.0,59.3 81.1,87.8 96.3,304.8 45.8,536.1 1.0,519.7 1.0,574.3 70.7,609.8 99.3,565.0 93.1,1163.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[692.0,394.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89724955033957,42.50762496897407]}},{"type":"Feature","properties":{"resourceCoords":[996.0,394.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8961094762245,42.50775537181064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p38","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0038","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"945.5,991.5 683.9,957.5 573.4,940.4 573.7,955.8 332.8,1040.1 304.6,931.8 89.4,844.3 81.1,843.8 81.8,645.5 72.7,541.1 70.8,37.3 338.6,36.1 339.4,136.9 567.0,136.0 803.3,139.7 1033.6,138.3 1033.5,616.4 1035.5,790.8 1034.0,1000.3 945.5,991.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[81.0,871.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.896072,42.509194]}},{"type":"Feature","properties":{"resourceCoords":[567.0,136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8930384,42.5081187]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p39","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0039","type":"ImageService3","width":1100,"height":1363},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"354.9,834.0 297.1,731.7 251.1,652.4 203.7,568.4 157.8,491.6 120.0,412.4 106.0,397.4 78.9,350.4 78.4,344.2 172.4,154.6 183.1,78.5 288.1,78.9 375.5,77.6 615.2,76.8 718.8,75.9 844.0,77.0 844.0,159.7 847.0,379.7 851.0,416.8 871.6,472.4 916.3,586.6 933.3,631.0 977.0,821.8 988.8,870.2 996.6,909.7 1000.2,947.0 1000.3,978.8 997.9,1019.0 996.2,1108.3 990.0,1107.1 970.0,1148.1 900.7,1177.6 481.9,1155.8 378.9,1074.2 322.1,882.5 292.4,877.0 354.9,834.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[494.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8937206,42.5067248]}},{"type":"Feature","properties":{"resourceCoords":[844.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8910771,42.5069842]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p4","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0004","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"747.0,1203.0 749.8,1193.8 570.6,1143.6 570.5,1149.0 83.1,1127.5 84.6,992.8 81.2,813.9 82.5,526.6 83.7,467.6 108.0,463.0 658.8,356.2 650.7,391.7 1099.0,404.3 1099.0,420.7 1026.5,430.2 1003.5,718.0 1039.2,1061.1 819.3,1165.3 832.6,1204.8 747.0,1203.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[583.0,699.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8867018,42.5316839]}},{"type":"Feature","properties":{"resourceCoords":[82.0,582.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8883909,42.5324551]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0040","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"161.9,1115.0 74.1,881.3 33.6,767.4 26.5,691.9 26.6,243.9 28.9,75.6 386.5,82.9 631.6,83.7 929.0,90.3 929.1,84.5 1000.0,89.1 986.2,182.7 1043.5,196.1 1006.8,378.5 1068.8,595.2 1039.5,996.1 1099.0,1018.3 1099.0,1019.2 1068.4,1034.9 1047.0,1180.4 778.2,1188.2 637.4,1136.4 573.9,1121.9 507.4,1129.4 333.2,1201.0 194.8,1205.0 161.9,1115.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[430.0,636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88928660982891,42.505615657980805]}},{"type":"Feature","properties":{"resourceCoords":[994.0,1258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88685935950495,42.50414433051406]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0041","type":"ImageService3","width":1100,"height":1363},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"942.7,1096.3 897.8,1074.1 770.9,1010.1 710.5,1118.0 539.4,1134.0 539.6,1124.5 281.4,1128.2 244.7,179.1 595.6,190.4 605.1,165.7 741.6,246.0 863.6,321.0 951.3,369.9 930.4,424.9 926.8,456.8 951.7,1075.7 942.7,1096.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[775.0,1014.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90132911995035,42.522374158824455]}},{"type":"Feature","properties":{"resourceCoords":[933.0,329.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89875901537505,42.52292510534179]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0042","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"179.7,789.7 180.9,765.5 201.3,367.8 224.6,356.8 789.0,90.0 820.0,80.8 879.3,78.5 890.4,180.7 882.5,591.3 891.9,589.8 885.6,1093.3 598.6,1146.2 598.9,1153.8 291.3,1220.9 182.5,1240.7 141.1,802.8 178.9,805.9 179.7,790.9 155.6,804.0 153.8,803.9 179.7,789.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[591.0,1162.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89950067534679,42.51973840016877]}},{"type":"Feature","properties":{"resourceCoords":[887.0,604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89861717937168,42.52137218845556]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p43","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0043","type":"ImageService3","width":1100,"height":1363},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"212.2,678.5 202.1,620.2 182.7,543.1 132.9,282.8 247.5,279.5 356.0,275.8 664.0,254.2 664.9,246.7 951.0,236.1 907.8,507.8 896.5,506.1 879.3,674.0 862.8,879.0 862.4,1037.0 713.5,1025.6 390.6,1013.0 363.9,848.8 354.3,774.2 341.7,711.0 232.4,747.5 212.2,678.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[345.0,706.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9002274870373,42.5182949790463]}},{"type":"Feature","properties":{"resourceCoords":[144.0,264.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90140363723779,42.51936641436731]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0044","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"834.2,1191.1 586.2,1144.0 517.8,1233.8 188.4,1211.5 98.5,1172.0 48.3,1096.5 315.1,944.1 249.8,714.2 167.4,389.1 146.0,317.9 93.3,115.9 416.7,101.2 566.2,100.0 582.8,280.3 658.9,245.6 805.9,172.5 932.1,114.3 952.9,112.0 943.4,178.7 911.3,325.4 891.8,402.5 894.9,1136.8 816.8,1386.0 799.0,1386.0 834.2,1191.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[423.0,726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89811788256415,42.515936656610364]}},{"type":"Feature","properties":{"resourceCoords":[395.0,485.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89837956023598,42.51659653902418]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p45","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0045","type":"ImageService3","width":1100,"height":1363},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1099.0,1219.1 1099.0,1129.3 1065.8,1003.3 1045.0,904.5 1031.5,819.9 1015.4,674.4 1025.5,572.8 1037.2,521.0 1060.4,446.4 1092.1,387.0 1099.0,376.4 1099.0,347.2 1078.5,334.7 742.8,129.2 691.0,97.0 571.3,21.3 501.1,122.5 329.9,121.8 331.1,112.4 74.7,91.3 76.1,66.6 1.0,265.4 1.0,342.4 39.8,691.1 30.4,852.2 30.3,853.2 37.3,853.2 251.0,1193.6 271.8,1184.8 365.2,1148.5 434.0,1130.4 498.3,1126.9 633.0,1149.5 689.4,1149.7 712.7,1150.9 1046.0,1215.0 1099.0,1219.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[716.0,665.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90303,42.521021]}},{"type":"Feature","properties":{"resourceCoords":[691.0,97.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9013008,42.5219911]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0046","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1061.4,1073.0 1040.0,1145.2 1034.3,1186.9 877.6,1147.1 704.5,1097.6 610.9,1067.5 505.8,1042.8 353.7,997.2 314.7,989.8 253.2,989.2 230.1,989.8 219.8,900.3 173.6,778.0 142.6,681.5 120.3,598.6 89.2,455.1 88.6,352.6 95.0,299.8 110.4,222.9 135.8,160.4 552.4,289.3 527.0,402.4 794.4,418.6 874.7,418.8 934.4,423.4 1007.0,420.9 1037.6,764.0 1049.2,939.3 1056.0,1007.4 1061.4,1073.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[698.0,1087.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90339835486151,42.51795927172977]}},{"type":"Feature","properties":{"resourceCoords":[795.0,415.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90097675947295,42.518630395216796]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p47","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0047","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"352.0,101.0 157.8,291.9 1.0,441.4 1.0,463.4 11.1,456.1 224.8,594.9 286.6,738.2 276.3,886.4 310.4,948.6 380.3,885.1 525.5,979.4 553.1,1060.4 981.9,1247.2 1030.1,437.8 1014.7,437.9 944.2,411.3 903.0,402.5 954.1,249.0 1016.1,79.7 940.9,93.3 707.6,125.8 477.1,154.2 428.8,157.2 401.4,145.9 352.0,101.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1007.0,798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.901962,42.516225]}},{"type":"Feature","properties":{"resourceCoords":[235.0,377.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9052992,42.5160358]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p48","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0048","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"504.2,1214.1 301.3,1042.5 177.4,868.2 196.2,64.3 246.2,62.1 314.1,57.8 488.4,52.7 829.9,34.9 945.4,30.7 939.6,95.2 927.7,169.7 906.9,335.2 882.7,542.8 876.8,617.1 835.5,950.5 813.0,1188.8 508.6,1234.0 504.2,1214.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[884.0,530.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.899452,42.516978]}},{"type":"Feature","properties":{"resourceCoords":[181.0,65.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.902684,42.517084]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0049","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"854.4,1178.7 570.4,1158.3 519.8,1181.6 492.3,1200.8 419.8,1104.1 363.1,1026.1 301.6,941.0 271.7,891.5 238.7,810.8 228.7,772.9 208.2,656.3 195.7,563.8 177.2,485.7 113.5,269.8 69.7,161.2 280.7,60.6 341.7,146.1 383.9,184.2 423.4,208.7 454.7,140.0 939.1,98.9 939.2,747.6 977.1,755.0 939.9,1180.9 854.4,1178.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[256.0,859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90950858938713,42.519023922913085]}},{"type":"Feature","properties":{"resourceCoords":[98.0,147.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91154026597006,42.52043419117753]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0005","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1023.7,1255.0 1043.8,1071.9 1039.5,880.4 1051.8,859.2 1050.8,729.4 1035.0,682.0 1006.1,193.1 786.6,196.9 361.1,208.3 359.9,221.6 78.2,57.1 1.0,216.7 1.0,1061.3 289.0,1029.7 287.1,1052.0 832.6,1177.6 1023.7,1255.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[803.0,533.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89089531821183,42.52887294980731]}},{"type":"Feature","properties":{"resourceCoords":[371.0,985.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89303528316437,42.528135345219546]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0050","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"804.1,1211.0 804.1,1154.5 826.4,1019.6 822.6,955.2 804.3,886.5 767.7,793.0 758.8,772.2 1099.0,557.2 1099.0,550.2 1017.3,545.8 828.7,120.3 764.4,103.6 751.5,124.0 345.8,129.7 232.8,40.1 248.4,1.0 218.8,1.0 226.1,51.6 207.7,97.7 179.3,99.9 175.1,750.1 212.9,757.7 172.9,1184.3 401.4,1191.6 628.6,1201.4 804.1,1211.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[421.0,340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9077018058541,42.52170989143634]}},{"type":"Feature","properties":{"resourceCoords":[791.0,1197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90468151875058,42.52031558589232]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0051","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"98.1,780.7 102.3,730.0 103.5,716.0 116.1,538.8 109.7,255.9 103.5,60.8 326.1,96.3 404.8,113.2 493.7,141.8 608.0,173.7 646.5,180.8 733.7,185.8 791.4,180.2 894.9,161.2 988.0,144.0 998.6,310.8 1002.6,404.3 1026.0,468.7 1046.4,495.9 1099.0,812.2 1099.0,1037.1 1037.6,1073.0 975.9,1214.4 685.2,1134.5 591.1,1172.9 311.1,1158.9 211.8,1216.9 210.4,1386.0 165.2,1386.0 128.0,1386.0 98.1,780.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[119.0,840.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91267776881385,42.518255564098446]}},{"type":"Feature","properties":{"resourceCoords":[119.0,275.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91158891654172,42.51962943271338]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p52","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0052","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1048.5,1010.0 1032.7,995.0 1031.4,776.8 1025.7,504.2 1022.2,418.7 1005.8,291.5 982.2,256.4 968.6,191.4 967.9,151.6 691.5,123.5 567.4,108.2 233.1,59.2 112.0,48.0 72.5,211.5 49.5,302.7 53.5,371.4 65.4,403.5 24.4,729.4 1.0,807.8 1.0,929.9 50.2,917.9 130.9,1086.5 250.8,1131.6 927.3,1061.0 993.6,1089.4 1041.7,1062.9 1048.5,1010.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[112.0,48.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.908463,42.518712]}},{"type":"Feature","properties":{"resourceCoords":[990.0,153.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9053139,42.5178439]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0053","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"965.6,964.8 864.9,883.3 823.2,874.1 768.0,836.1 739.7,807.5 518.2,979.7 416.8,1055.0 138.3,1252.2 118.1,1224.8 93.0,1174.0 106.0,884.9 105.4,566.1 107.5,335.5 111.3,157.3 135.0,157.7 475.4,210.2 553.9,213.5 615.9,218.2 654.8,228.3 805.2,284.7 909.8,316.7 1002.1,353.5 1016.4,429.5 1050.6,665.2 1080.8,898.1 1084.1,946.9 1072.9,974.5 1027.8,1024.8 965.6,964.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1026.0,519.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90389819031638,42.51762545761378]}},{"type":"Feature","properties":{"resourceCoords":[123.0,167.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90461693840382,42.52026213115656]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p54","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0054","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"193.2,1073.9 135.6,1122.6 110.4,1083.8 88.5,1031.3 69.7,928.2 60.2,770.9 48.2,109.4 47.5,68.1 402.5,32.3 490.4,49.7 601.0,161.9 895.6,87.7 899.2,46.8 925.7,119.8 1010.8,141.7 1033.9,594.0 890.0,679.0 844.4,761.5 868.5,830.5 816.3,1033.2 846.2,1093.2 753.0,1181.6 725.7,1169.0 710.8,1218.8 674.9,1252.7 193.2,1073.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0054/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.914346,42.5220893]}},{"type":"Feature","properties":{"resourceCoords":[1100.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.9122017,42.5247639]}},{"type":"Feature","properties":{"resourceCoords":[1100.0,1387.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.9076257,42.52277120000001]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1387.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.90977,42.5200966]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0055__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p55 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0055__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0055","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"100.0,28.9 144.6,81.2 197.8,136.4 241.2,172.8 239.8,202.7 188.0,248.2 140.5,287.1 85.2,320.4 107.5,446.4 135.8,590.3 150.8,694.5 154.8,806.7 156.3,1155.6 159.4,1267.0 160.0,1284.3 538.1,1131.4 534.6,959.5 759.5,852.7 760.5,910.0 760.9,935.2 1099.0,902.6 1085.1,894.5 1080.5,277.5 1037.9,46.3 858.4,23.8 625.6,71.2 216.1,72.5 158.6,1.0 82.4,1.0 100.0,28.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0055__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[529.0,712.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91521383250988,42.5218604743449]}},{"type":"Feature","properties":{"resourceCoords":[755.0,821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91441738743556,42.52225526331531]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p56","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0056","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.5,514.9 622.1,368.9 621.7,197.1 848.3,94.4 848.3,151.6 848.0,218.3 845.3,880.6 851.3,1038.2 617.6,1034.0 608.4,1150.8 413.5,1153.5 131.1,1155.1 140.3,965.9 217.9,968.8 267.7,958.2 248.7,910.5 242.7,621.8 241.5,514.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[231.0,1155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91192,42.519238]}},{"type":"Feature","properties":{"resourceCoords":[622.0,62.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.914836,42.521709]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p57","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0057","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"924.9,54.8 945.5,82.4 994.5,131.6 1052.5,182.8 1099.0,216.1 1099.0,247.2 1051.4,296.0 1006.8,339.0 953.8,376.9 986.2,501.8 1026.1,644.3 1049.4,748.0 1062.3,860.5 1091.5,1211.3 975.4,1213.7 673.4,1225.8 543.0,1229.5 315.9,1232.0 212.9,1228.8 112.8,1229.7 240.2,1162.0 69.6,933.8 21.1,314.6 72.8,84.6 216.5,37.5 894.0,30.8 1001.3,48.8 924.9,54.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[739.0,780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91657440223067,42.52020198633047]}},{"type":"Feature","properties":{"resourceCoords":[503.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91620476074392,42.51920902511776]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0058","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"83.7,979.2 95.5,874.6 111.8,642.9 119.0,509.7 131.6,201.0 138.9,82.5 253.8,79.6 381.9,76.2 679.9,65.5 728.9,45.1 740.5,96.3 738.8,176.5 934.1,183.1 920.8,365.7 915.1,432.3 944.5,1056.0 1029.5,1056.2 1028.8,1123.2 825.1,1224.5 131.9,1210.7 76.2,1081.3 83.7,979.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[379.0,85.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91370382747694,42.51998632018692]}},{"type":"Feature","properties":{"resourceCoords":[898.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.91220403968157,42.51906554860031]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p59","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0059","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"465.7,1050.8 334.9,937.9 296.4,784.1 162.0,668.0 128.6,677.3 32.6,574.5 49.9,532.2 71.5,513.2 159.9,459.4 205.2,437.8 446.6,371.7 491.9,349.7 560.0,293.7 557.2,241.1 545.2,149.8 540.0,72.9 622.7,92.6 711.9,107.2 788.8,125.3 873.2,156.7 900.4,168.4 994.5,237.4 1036.8,272.2 1040.4,422.7 1039.8,489.9 1045.7,996.0 1048.5,1180.0 599.7,1187.2 599.3,1102.5 417.4,1106.7 465.7,1050.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[773.0,1191.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90646217672702,42.524946632687126]}},{"type":"Feature","properties":{"resourceCoords":[1045.0,244.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90803690596759,42.52746050457781]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p6","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0006","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.8,621.5 77.2,412.0 82.3,86.5 573.0,113.5 573.2,108.0 753.1,160.5 750.2,169.8 836.4,172.5 885.5,323.2 889.9,552.8 823.5,750.1 893.6,1014.6 774.4,1196.0 763.2,1194.1 580.5,1172.8 349.6,1140.8 214.4,1117.0 124.4,1105.6 78.2,1104.2 76.8,621.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[302.0,555.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8888149,42.5295322]}},{"type":"Feature","properties":{"resourceCoords":[78.0,907.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8900492,42.5287822]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p60","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0060","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"129.8,656.0 76.4,564.4 66.2,300.2 107.9,209.2 262.4,287.6 349.7,188.2 531.4,185.6 531.0,270.2 979.1,267.1 980.5,485.8 975.0,814.0 978.6,814.4 938.1,1105.5 959.8,1120.4 965.1,1147.1 947.8,1172.3 928.1,1177.5 919.0,1242.5 509.4,1241.0 268.8,1199.0 131.4,754.6 69.5,730.4 129.8,656.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[531.0,267.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9069798,42.5246432]}},{"type":"Feature","properties":{"resourceCoords":[975.0,814.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.904327,42.524312]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p61","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0061","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"60.3,1262.3 128.5,1262.2 641.9,1251.9 1050.7,1242.2 1082.0,1242.2 1072.8,967.2 1075.7,967.2 1075.3,709.4 1076.3,418.7 1077.5,418.7 1055.0,42.6 1048.1,42.9 931.1,48.4 799.4,59.7 642.8,61.2 337.0,78.5 144.5,105.2 187.1,265.6 228.6,435.9 241.5,550.8 239.6,599.9 225.9,667.4 191.4,773.4 172.1,822.4 71.9,1037.2 41.7,1097.3 1.0,1152.5 1.0,1225.5 34.0,1253.2 60.3,1262.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[636.0,429.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90381666490516,42.527349234068474]}},{"type":"Feature","properties":{"resourceCoords":[636.0,711.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9046249436776,42.52684387376194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p62","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0062/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0062","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"700.0,1303.3 694.7,1283.4 669.4,1265.9 642.6,1271.2 627.4,1292.9 334.7,1251.3 334.2,1254.9 35.0,1249.0 31.6,976.6 34.4,976.6 39.4,721.4 46.3,433.5 47.5,433.6 32.9,60.6 83.0,59.3 114.0,58.9 471.0,61.2 739.6,65.0 773.9,79.3 775.6,80.0 804.9,88.2 1044.6,136.9 872.7,1104.4 765.4,1312.6 700.0,1303.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[430.0,446.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90178696902731,42.525610627524756]}},{"type":"Feature","properties":{"resourceCoords":[478.0,64.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90058043317256,42.52621805233565]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p63","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0063","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1021.9,925.2 1096.6,1119.8 1053.9,1165.4 985.5,1106.4 919.5,1062.4 840.8,1017.5 769.9,970.0 747.9,1044.2 727.3,1134.2 711.4,1184.7 627.9,1213.5 577.5,1218.3 327.4,1196.1 277.2,1200.5 175.2,1220.2 148.3,1230.5 117.2,1264.3 50.4,1104.0 78.5,995.1 50.6,944.5 105.1,903.5 125.2,810.1 118.0,346.9 189.9,257.9 200.3,136.8 571.5,92.2 726.6,144.3 1033.4,162.5 1032.1,850.2 1053.9,895.1 1021.9,925.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[453.0,1206.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.909715,42.525801]}},{"type":"Feature","properties":{"resourceCoords":[453.0,180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.913132,42.527185]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p64","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0064","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"965.9,699.6 904.9,755.5 877.1,887.2 931.6,908.5 912.7,997.9 808.4,1142.8 761.3,1132.9 706.8,1204.9 253.6,1256.5 124.7,1239.1 94.0,1198.2 57.8,532.3 92.0,416.7 53.0,275.9 102.8,109.5 441.4,18.9 876.9,27.4 967.5,66.3 964.5,120.6 1033.0,160.2 1063.8,117.0 1025.3,712.1 965.9,699.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[491.0,715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.901036,42.504924]}},{"type":"Feature","properties":{"resourceCoords":[491.0,471.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.901228,42.505594]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p66","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0066","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"579.0,1123.8 537.7,1160.9 454.3,1244.5 438.4,1269.9 384.6,1237.1 207.7,1350.8 171.5,1325.4 281.9,1240.4 89.2,1059.8 156.5,375.8 119.5,332.5 167.8,322.6 180.3,198.9 337.4,162.9 378.2,155.4 725.3,81.4 997.0,16.7 1013.4,181.4 1027.3,355.8 1021.7,471.0 1012.0,519.1 987.8,583.4 937.0,682.4 910.2,727.5 777.3,923.3 738.0,977.7 688.0,1026.7 676.7,1096.5 705.6,1130.0 730.1,1143.2 579.0,1123.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[609.0,378.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.906079,42.528905]}},{"type":"Feature","properties":{"resourceCoords":[247.0,1150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.909005,42.527929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p67","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0067","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"121.2,1163.3 156.0,1164.0 270.8,1152.2 441.0,1109.3 697.5,1085.1 725.6,1080.3 677.4,1150.8 683.0,1166.8 881.9,1188.5 989.9,1145.2 1009.6,1051.9 1051.7,1028.6 1082.2,627.1 1031.1,177.4 771.0,184.0 575.5,138.4 507.7,164.9 292.1,103.0 126.3,101.3 86.2,326.8 104.6,816.6 68.5,880.5 1.0,917.9 1.0,967.5 117.4,1003.9 121.2,1163.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90809487326334,42.532014169035925]}},{"type":"Feature","properties":{"resourceCoords":[117.0,1174.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90630215519084,42.52982378861908]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0068__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p68 [1]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.08"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2128.8"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"3419.2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0068__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0068","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"944.5,862.4 824.6,929.4 519.0,664.4 386.1,708.3 326.4,654.7 210.7,572.8 150.7,532.2 138.3,551.1 166.2,832.8 214.2,1019.6 227.6,1145.8 227.0,1184.0 272.1,1184.7 658.0,1179.9 961.5,1168.8 940.0,1108.9 934.6,1056.5 959.7,944.0 979.8,753.2 944.5,862.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0068__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[133.0,520.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.905492,42.531445]}},{"type":"Feature","properties":{"resourceCoords":[227.0,1184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9063301,42.5298486]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0069","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"93.8,1013.6 85.4,882.3 87.4,726.5 77.0,422.0 54.6,229.9 100.0,193.3 143.8,172.8 248.8,160.6 420.0,120.3 546.1,92.8 658.8,78.1 668.7,67.9 703.8,61.0 712.5,708.0 741.8,708.1 741.5,1244.8 426.1,1226.3 98.5,1218.5 98.1,1187.4 96.7,1130.1 93.8,1013.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[739.0,66.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.9025606041316,42.53057365992054]}},{"type":"Feature","properties":{"resourceCoords":[431.0,1223.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.90053027696766,42.527594916839135]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0007","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"944.2,1226.9 292.3,914.1 282.2,734.5 262.2,554.0 216.7,370.6 224.0,347.5 195.1,222.8 169.6,180.7 214.4,169.4 304.2,155.9 440.9,141.9 672.0,109.7 853.7,80.2 887.3,76.8 978.6,71.1 889.0,337.0 805.0,609.4 1027.8,748.9 1018.2,845.6 1026.9,830.5 1099.0,959.7 1099.0,1146.3 979.5,1241.1 944.2,1226.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[804.0,606.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88917144064285,42.5262571223476]}},{"type":"Feature","properties":{"resourceCoords":[881.0,70.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88778249386145,42.527392839447025]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p70","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0070","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"189.3,1026.2 115.4,1025.5 85.9,952.7 87.2,850.3 64.3,822.6 52.8,692.1 57.5,502.2 85.8,356.8 72.7,276.7 99.0,168.3 75.1,113.8 123.9,117.1 228.2,214.0 312.4,220.9 381.4,181.5 439.6,118.9 457.7,64.5 577.3,29.9 667.2,55.2 747.1,38.8 816.8,106.8 836.0,173.2 907.7,249.5 932.0,362.7 926.4,529.1 949.7,570.2 946.0,650.9 1070.7,757.1 1099.0,728.3 1099.0,877.2 977.0,946.6 989.9,960.6 948.2,1000.6 918.5,1015.5 883.1,1024.2 881.6,1120.3 618.9,1114.1 618.6,1128.4 301.7,1125.4 304.7,1142.7 189.3,1026.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[619.0,578.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.897912,42.531316]}},{"type":"Feature","properties":{"resourceCoords":[619.0,863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.899523,42.530213]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p71","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0071","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"827.1,1154.2 844.4,1127.9 989.8,1151.2 1076.3,891.9 1080.4,908.4 1099.0,839.1 1099.0,212.2 925.8,1.0 531.4,1.0 292.1,156.8 319.6,183.3 241.1,268.1 183.7,301.5 114.0,323.0 122.7,515.1 115.9,824.5 120.2,1145.2 471.3,1135.0 735.5,1129.3 771.4,1142.8 800.5,1149.8 827.1,1154.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[324.0,1139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.900963,42.526554]}},{"type":"Feature","properties":{"resourceCoords":[114.0,323.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.899047,42.528489]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0072__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p72 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0072__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0072","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"959.5,1034.2 964.0,360.0 983.0,357.9 946.9,107.6 693.9,30.5 556.6,29.6 469.6,96.5 361.8,110.6 165.7,58.6 138.0,102.8 205.2,158.2 425.0,132.2 440.8,299.1 429.5,315.8 429.8,328.2 421.0,328.3 419.4,330.6 216.7,333.5 121.2,396.2 59.0,539.4 37.7,883.5 115.7,1230.3 183.0,1264.5 517.1,1201.3 547.9,1217.0 876.5,1067.3 959.5,1034.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0072__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[597.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8701591,42.5344978]}},{"type":"Feature","properties":{"resourceCoords":[964.0,360.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8666319,42.534643]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p73 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.8,1131.2 256.5,1096.3 310.2,1218.5 315.1,1251.8 330.7,1221.0 500.0,1204.8 603.3,1128.3 819.9,1071.8 871.8,1001.4 848.7,909.1 898.7,789.5 783.0,424.7 731.3,103.1 632.4,160.3 306.9,156.3 220.9,209.4 161.2,191.2 198.0,445.1 178.8,447.3 174.8,1131.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[411.0,756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8672827,42.5336663]}},{"type":"Feature","properties":{"resourceCoords":[411.0,427.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8661612,42.5340855]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p73 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.38"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3191.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"1208.8"},{"label":"split_canvas_h","value":"2907.6"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"821.9,98.6 835.2,115.0 833.4,397.3 916.1,610.0 965.7,686.0 1062.2,688.6 1083.1,406.4 1060.2,305.4 1072.3,200.8 1094.4,182.6 1099.0,166.1 1099.0,107.9 1099.0,98.1 1054.0,97.6 1007.9,96.0 821.9,98.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0073__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[960.4,354.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8707391,42.5330099]}},{"type":"Feature","properties":{"resourceCoords":[840.7,234.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8708596,42.5339481]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0074__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p74 [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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0074__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0074","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"160.1,254.3 235.9,632.5 256.6,728.6 269.8,806.9 274.9,880.5 273.5,943.0 266.4,1022.2 258.4,1197.9 505.8,1251.5 590.2,1174.0 708.5,1183.4 762.5,1086.7 923.5,1069.4 986.7,825.6 1038.8,829.2 1044.1,796.5 1081.5,385.5 1045.8,279.1 981.9,259.2 984.9,240.9 724.6,244.9 589.0,193.0 527.8,178.2 463.4,184.5 293.8,251.5 159.8,253.6 160.1,254.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0074__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.0,500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88702293448397,42.50359163393381]}},{"type":"Feature","properties":{"resourceCoords":[301.0,1008.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88884487967923,42.501908694602804]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0076__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p76 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.20"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3358.8"},{"label":"split_canvas_w","value":"1486.8"},{"label":"split_canvas_h","value":"2189.2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0076__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0076","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"64.5,870.9 59.2,1191.5 181.1,1239.5 286.0,1194.6 355.2,890.7 64.5,870.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0076__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,839.7],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.90713402220825,42.48632704267719]}},{"type":"Feature","properties":{"resourceCoords":[371.7,839.7],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.90609668031603,42.48700069134491]}},{"type":"Feature","properties":{"resourceCoords":[371.7,1387.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.90476043568101,42.48586582521478]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1387.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-70.90579777757324,42.48519217654706]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p8","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0008","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"843.2,1236.7 760.1,1386.0 584.0,1386.0 600.6,1312.0 511.5,1291.9 447.6,1277.5 454.8,1370.0 453.8,1370.9 439.3,1183.2 356.7,1058.9 349.2,1074.8 351.2,976.8 116.4,853.9 179.6,573.5 249.1,299.2 157.7,312.0 135.4,316.1 184.9,102.6 225.8,160.9 311.6,160.7 383.5,104.0 535.1,156.2 912.5,97.7 985.4,126.7 984.2,208.7 951.1,212.5 926.7,640.0 921.5,753.2 1000.4,846.6 912.7,918.8 898.0,1096.3 891.5,1202.1 878.0,1255.0 843.2,1236.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[466.0,1041.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88857330806478,42.52523001638402]}},{"type":"Feature","properties":{"resourceCoords":[672.0,251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.88609949465827,42.526608897922515]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0081__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p81 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.73"},{"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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0081__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0081","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"817.4,1187.4 974.0,1174.0 975.0,930.6 973.5,740.5 974.4,540.9 970.7,355.5 983.9,174.2 974.0,132.8 973.5,20.3 919.4,137.2 669.2,178.2 640.0,224.7 646.5,586.1 584.5,757.8 406.6,1016.3 264.9,914.8 152.3,1079.2 219.6,1130.4 187.4,1181.0 322.4,1233.7 792.7,1166.5 817.4,1187.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0081__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[756.0,544.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.896051,42.503408]}},{"type":"Feature","properties":{"resourceCoords":[974.0,1174.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.89401,42.502407]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0009__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Salem, Massachusetts | 1957 | sanborn03836_004 p9 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.39"},{"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":"4400.0"},{"label":"split_canvas_h","value":"5548.0"}],"created":"2026-10-24T15:18:53Z","modified":"2026-10-24T15:18:53Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0009__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0009","type":"ImageService3","width":1100,"height":1387},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"23.1,812.9 1.0,822.1 1.0,998.7 120.3,1082.7 133.7,1109.0 202.3,1273.4 276.8,1232.0 344.1,1185.2 437.7,1107.8 549.4,1007.7 615.6,941.1 676.2,870.8 726.3,803.4 766.3,733.4 786.9,687.9 815.0,620.8 911.0,369.7 938.5,277.7 967.5,193.5 1007.8,98.7 962.2,48.0 813.0,75.9 799.7,53.0 749.4,114.7 721.9,97.7 445.8,408.7 373.7,491.7 376.9,587.9 377.6,610.4 356.6,610.8 276.3,612.4 267.4,612.5 149.2,739.0 80.6,815.6 38.5,847.8 23.1,812.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd376m:g3764m:g3764sm:g038361957:03836_1957-0009__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[813.0,154.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8848199,42.5260472]}},{"type":"Feature","properties":{"resourceCoords":[127.0,1073.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-70.8875013,42.5233958]}}]}}]}