{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn00813_035.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"San Francisco, California | 1950 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"105"},{"label":"placed","value":"90"},{"label":"unplaced","value":"15"},{"label":"fit sources","value":"georef 42, georef-snap 41, snap:0 5, georef-street 1, snap:2 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"8 sheet(s) cut into 16 panels"},{"label":"unplaced pages","value":"p545__1 (tier 1, 37.76592,-122.39397 +/-187m); p546__1 (tier 1, 37.76634,-122.38908 +/-162m); p546__2 (tier 1, 37.76659,-122.38960 +/-100m); p547 (tier 3, 37.76702,-122.38646 +/-403m); p548 (tier 1, 37.76717,-122.38647 +/-248m); p562 (tier 1, 37.73269,-122.37846 +/-239m); p582 (tier 1, 37.75759,-122.41003 +/-263m); p591 (tier 2, 37.76110,-122.38676 +/-110m); p592 (tier 2, 37.76100,-122.38306 +/-100m); p601 (tier 1, 37.75448,-122.40797 +/-260m); p610 (tier 2, 37.75641,-122.38656 +/-1008m); p617 (tier 1, 37.75118,-122.40946 +/-262m); p620 (tier 1, 37.75314,-122.40383 +/-264m); p622 (tier 1, 37.75213,-122.40053 +/-507m); p637 (tier 2, 37.75264,-122.38224 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p541 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3869.6"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"3926.4"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.9,1806.2 800.5,1808.5 1507.8,1801.8 1502.1,1047.3 1489.8,1049.3 474.1,995.5 322.8,1062.4 193.1,1038.1 168.5,1063.8 174.9,1806.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[167.0,1786.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41040874819276,37.76435472177262]}},{"type":"Feature","properties":{"resourceCoords":[1530.0,1786.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40739729634956,37.76451713844582]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p541 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.16"},{"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":"6648.0"},{"label":"split_canvas_h","value":"3918.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1505.5,32.7 1422.3,99.8 1192.7,39.5 687.0,80.2 172.1,53.5 175.3,339.7 165.5,905.0 249.1,867.6 581.7,864.8 958.8,867.2 1508.0,865.5 1505.5,32.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0541__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[524.0,865.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4123255,37.7642072]}},{"type":"Feature","properties":{"resourceCoords":[1508.0,865.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4103883,37.7643204]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p542 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.83"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3896.0"},{"label":"split_canvas_w","value":"6580.0"},{"label":"split_canvas_h","value":"3900.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"336.6,1072.7 616.5,1948.0 1042.0,1948.0 1046.0,1928.0 1160.0,1923.0 1240.5,1929.3 1344.0,1082.9 1344.4,1017.5 534.5,1092.2 471.2,1073.8 336.6,1072.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,1076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.404633,37.7659639]}},{"type":"Feature","properties":{"resourceCoords":[1344.0,1076.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4036662,37.7660239]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p542 [2]","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":"6580.0"},{"label":"split_canvas_h","value":"3896.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"290.4,127.9 285.9,873.6 1330.0,878.9 1438.0,879.2 1204.6,141.2 1315.8,142.5 935.5,30.8 290.4,127.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0542__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40625232387791,37.76457937781736]}},{"type":"Feature","properties":{"resourceCoords":[278.0,865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40746322064906,37.76450101661288]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p543 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.18"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3869.6"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"3926.4"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"392.7,1787.0 1352.0,1786.3 1351.2,1264.0 1342.9,1051.9 1317.6,1062.2 813.5,1077.1 581.5,1059.2 562.4,974.1 556.7,974.2 522.9,974.4 511.2,974.5 323.7,1786.2 392.7,1787.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[836.0,1786.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4006424,37.7649123]}},{"type":"Feature","properties":{"resourceCoords":[318.0,1786.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4016266,37.7648521]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p543 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6648.0"},{"label":"split_canvas_h","value":"3910.4"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543","type":"ImageService3","width":1662,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1192.1,877.5 1197.0,877.7 1364.8,181.2 1408.7,181.3 1402.4,152.2 1260.7,93.5 653.3,56.4 333.7,83.2 332.9,137.7 236.5,876.0 711.2,878.2 1192.1,877.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0543__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,865.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40242395321329,37.764818433869934]}},{"type":"Feature","properties":{"resourceCoords":[314.0,159.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40370264701683,37.76597219267158]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p544 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3924.0"},{"label":"split_canvas_w","value":"6580.0"},{"label":"split_canvas_h","value":"3872.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"293.0,1804.0 767.7,1809.7 993.6,1806.6 987.3,1012.3 903.6,1038.9 406.2,1060.4 293.1,1108.4 296.1,1518.8 293.0,1804.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[293.0,1804.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3977419,37.7650824]}},{"type":"Feature","properties":{"resourceCoords":[293.0,1083.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.397869,37.7663773]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p544 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.07"},{"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":"6580.0"},{"label":"split_canvas_h","value":"3924.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"307.3,894.4 804.9,896.2 1320.8,897.6 1324.0,555.4 1319.6,63.0 1203.9,112.3 457.7,91.7 297.1,157.2 305.8,370.1 307.3,894.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0544__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[821.0,147.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39879655951272,37.76614932618708]}},{"type":"Feature","properties":{"resourceCoords":[291.0,147.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39980038367348,37.7660889972006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0545__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p545 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.03"},{"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":"6604.0"},{"label":"split_canvas_h","value":"3923.6"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0545__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0545","type":"ImageService3","width":1651,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1468.4,586.5 1422.4,190.8 1166.7,55.5 360.3,56.6 183.8,115.2 198.7,814.8 281.6,812.5 323.5,811.4 997.1,805.8 1039.7,813.4 1055.6,832.0 1382.5,829.3 1382.2,827.0 1468.4,586.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0545__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[652.0,169.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3950865,37.7665527]}},{"type":"Feature","properties":{"resourceCoords":[404.0,-103.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3957718,37.7670753]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0549/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p549","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0549/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0549","type":"ImageService3","width":1651,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1297.5,982.3 1296.3,1202.3 1300.2,1888.0 1300.5,1926.8 1253.0,1927.0 1128.0,1921.0 967.0,1925.0 695.0,1922.0 524.0,1930.0 343.0,1925.0 278.9,1926.2 241.3,1794.8 235.6,785.0 186.6,720.4 291.7,93.0 1289.9,66.8 1297.5,982.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0549/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1016.0,1868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.42001905431417,37.76184064195396]}},{"type":"Feature","properties":{"resourceCoords":[920.0,99.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.42050975773593,37.76494945784336]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0550/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p550","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0550/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0550","type":"ImageService3","width":1639,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"237.0,1195.8 241.1,978.4 245.9,73.5 1214.9,60.4 1214.8,75.3 1301.9,76.1 1307.8,985.3 1303.1,985.3 1260.5,1881.8 1252.7,1881.8 231.6,1873.5 237.0,1195.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0550/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[814.0,1872.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41806844928946,37.761929991282265]}},{"type":"Feature","properties":{"resourceCoords":[756.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41853911282655,37.76513086919397]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0551/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p551","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0551/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0551","type":"ImageService3","width":1651,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1230.3,48.9 1230.4,82.3 1352.4,81.2 1307.0,986.8 1292.6,986.9 1366.5,1874.2 1301.5,1874.9 1192.7,1874.8 738.4,1882.7 351.4,1887.0 377.9,995.6 382.7,995.6 360.8,92.5 274.2,93.2 274.1,78.3 1230.3,48.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0551/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[258.0,1879.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41727310727896,37.761982509042376]}},{"type":"Feature","properties":{"resourceCoords":[1432.0,347.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41483406697539,37.764874466392136]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0552/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p552","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0552/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0552","type":"ImageService3","width":1639,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"608.4,1872.8 443.7,1872.7 379.3,984.5 393.6,984.5 448.7,79.5 326.7,79.3 326.9,45.8 376.7,44.8 1292.1,94.7 1294.2,342.9 1284.5,833.0 1282.5,1872.5 1133.3,1876.4 1132.7,1921.6 1114.0,1921.0 1045.0,1925.0 1046.0,1942.0 1132.4,1942.0 1132.3,1948.0 911.5,1948.0 962.8,1875.3 874.5,1874.8 821.9,1948.0 767.7,1948.0 768.0,1874.0 608.4,1872.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0552/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[327.0,984.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4151738,37.7637018]}},{"type":"Feature","properties":{"resourceCoords":[1292.0,82.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.413139,37.765454]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0553/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p553","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.27"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0553/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0553","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"156.7,204.7 171.3,1399.2 1.0,1406.0 1.0,1704.6 177.9,1834.8 177.5,1799.9 593.5,1794.8 1019.7,1785.1 1516.2,1785.3 1504.7,893.4 1493.2,149.9 946.2,157.9 570.6,159.8 239.4,166.5 156.7,204.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0553/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[142.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41296027689452,37.762907755812776]}},{"type":"Feature","properties":{"resourceCoords":[1534.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41020646893485,37.763043446848734]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0554/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p554","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0554/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0554","type":"ImageService3","width":1629,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"72.9,895.0 73.2,155.8 768.0,165.4 1553.6,165.8 1551.4,973.9 1522.3,1022.2 1516.9,1593.2 1517.3,1786.2 1111.0,1782.5 1046.0,1782.0 70.2,1781.8 72.9,895.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0554/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1046.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4083274,37.763156]}},{"type":"Feature","properties":{"resourceCoords":[1046.0,1782.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4082015,37.7618847]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0555/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p555","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.61"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0555/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0555","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1257.8,166.0 1363.4,165.7 1378.3,165.6 1373.3,150.2 1557.8,149.7 1558.2,1775.8 1504.5,1774.8 1434.0,1773.8 1134.3,1769.3 1073.5,1768.5 1073.6,1779.3 574.7,1759.2 533.9,1776.9 62.3,1774.2 61.4,1582.9 65.2,1016.7 93.9,968.7 93.9,167.4 1257.8,166.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0555/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[592.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.406324,37.7632775]}},{"type":"Feature","properties":{"resourceCoords":[1558.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4043871,37.7633932]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0556/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p556","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.66"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0556/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0556","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"300.1,145.7 303.9,127.5 407.9,123.1 481.4,129.0 477.1,164.4 996.1,163.6 1521.8,159.5 1525.6,618.1 1525.6,914.7 1536.0,1012.7 1541.1,1205.4 1538.1,1773.5 1041.5,1763.7 87.9,1759.6 95.0,146.2 300.1,145.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0556/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1062.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40229390329216,37.76221454491232]}},{"type":"Feature","properties":{"resourceCoords":[1062.0,148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40255756718514,37.76481149789574]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0557/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p557","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.52"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0557/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0557","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"172.0,162.1 1063.5,158.8 1524.5,159.7 1533.7,904.4 1532.8,1745.6 1084.3,1746.8 1044.6,1746.9 589.9,1747.8 128.0,1756.6 127.7,1195.0 121.6,1004.7 110.7,907.9 109.0,614.7 102.6,161.4 172.0,162.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0557/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1534.0,956.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3985786,37.7637396]}},{"type":"Feature","properties":{"resourceCoords":[584.0,160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4006424,37.7649123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0558/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p558","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.71"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0558/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0558","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"586.0,152.9 1125.9,156.8 1489.8,150.2 1543.9,149.2 1551.7,1013.0 1554.0,1771.0 1070.8,1772.2 108.0,1776.0 107.7,915.2 97.0,153.2 586.0,152.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0558/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[108.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3985786,37.7637396]}},{"type":"Feature","properties":{"resourceCoords":[108.0,1776.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.398461,37.762463]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0559/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p559","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0559/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0559","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1064.5,1767.4 568.4,1757.8 99.4,1760.2 105.5,1010.8 107.5,156.6 967.3,166.5 1021.5,177.3 1041.4,201.4 1458.6,206.3 1536.9,968.3 1526.6,968.2 1561.4,1773.6 1064.5,1767.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0559/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1065.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3937569,37.764035]}},{"type":"Feature","properties":{"resourceCoords":[106.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3956935,37.7639061]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0560/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p560","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.56"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0560/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0560","type":"ImageService3","width":1645,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"139.9,1009.8 149.6,1010.0 85.8,290.8 198.8,6.2 203.1,59.0 1420.7,35.5 1512.1,167.2 1524.4,185.0 1411.7,183.1 1390.1,1022.2 1505.2,1025.5 1502.3,1096.8 1501.9,1795.8 1053.5,1787.0 608.5,1776.8 609.1,1720.2 158.5,1644.7 139.9,1009.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0560/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[605.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39183315160278,37.7642335626594]}},{"type":"Feature","properties":{"resourceCoords":[1062.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39085149708569,37.76430978370667]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0561/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p561","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.06"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0561/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0561","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"391.2,1039.0 393.4,959.3 264.7,957.2 277.4,19.1 403.4,19.8 420.0,43.0 777.1,118.1 1249.7,87.7 1544.9,263.9 1488.3,303.3 1424.3,963.4 1416.0,964.0 1410.7,1103.7 1468.9,1871.4 1452.7,1922.0 1426.0,1921.0 1395.8,1922.0 1396.8,1818.8 1305.3,1804.8 920.0,1807.7 865.5,1823.0 522.1,1817.8 400.2,1820.1 391.2,1039.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0561/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[865.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3889802,37.764349]}},{"type":"Feature","properties":{"resourceCoords":[1416.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38792,37.764421]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0563/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p563","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0563/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0563","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1441.3,13.9 1441.4,9.0 1231.0,10.0 1007.0,24.0 852.0,19.0 853.0,2.0 548.6,1.0 244.4,1.0 252.0,58.8 159.6,632.7 194.0,1807.4 254.5,1858.4 241.8,1924.2 334.0,1923.0 489.0,1931.0 892.0,1926.0 1007.0,1920.0 1311.0,1927.0 1399.0,1920.0 1431.9,1920.0 1431.8,1890.5 1437.3,1018.5 1441.3,13.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0563/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[241.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4214395,37.7601014]}},{"type":"Feature","properties":{"resourceCoords":[1437.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.419228,37.7602424]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0564/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p564","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0564/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0564","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.1,1862.4 238.8,1814.5 238.3,1720.8 241.2,1007.2 242.6,185.2 242.8,113.5 242.8,70.1 1262.3,73.0 1291.9,73.0 1327.5,967.5 1342.7,967.6 1260.0,1860.5 1257.2,1860.5 560.4,1860.8 292.4,1861.5 238.1,1862.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0564/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[834.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4178869970541,37.760322397689094]}},{"type":"Feature","properties":{"resourceCoords":[834.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4180453485353,37.76191984576333]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0565/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p565","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0565/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0565","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1265.0,1857.2 455.8,1860.0 303.9,1860.2 380.9,971.6 365.8,971.6 325.2,82.2 690.2,80.5 1144.2,75.6 1253.0,76.5 1482.5,75.6 1641.0,76.2 1641.0,356.5 1639.8,358.2 1548.0,358.4 1204.7,841.2 1205.4,968.0 1257.8,967.3 1286.4,967.3 1360.0,1856.9 1265.0,1857.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0565/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[824.0,971.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41572969712927,37.76044964793951]}},{"type":"Feature","properties":{"resourceCoords":[824.0,1855.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41558409667462,37.75886069820082]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0566/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p566","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0566/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0566","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1401.5,1847.5 1396.2,1135.5 1395.8,701.5 1394.5,115.8 1264.8,18.1 1103.0,9.0 1102.1,1.0 1054.9,1.0 1054.0,9.0 956.0,13.0 819.0,9.0 818.1,1.0 641.6,1.0 218.1,595.0 218.8,751.4 228.8,751.2 283.4,750.5 318.7,750.5 407.9,1847.9 758.3,1847.3 1401.5,1847.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0566/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[813.0,1848.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4136186,37.7589705]}},{"type":"Feature","properties":{"resourceCoords":[216.0,1848.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.414719,37.7589063]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0567/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p567","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.16"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0567/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0567","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"237.3,1810.0 175.4,1810.0 170.5,1135.6 170.2,724.4 169.0,134.1 591.7,133.7 1024.8,128.9 1529.2,135.1 1533.2,913.5 1532.5,1538.1 1546.0,1657.9 1588.5,1805.6 1132.5,1806.5 1012.6,1804.2 552.8,1807.8 237.3,1810.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0567/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[623.0,961.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4117852815372,37.76039145921206]}},{"type":"Feature","properties":{"resourceCoords":[1543.0,961.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40999535679994,37.76049615602544]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0568/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p568","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.06"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0568/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0568","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1303.2,1777.2 832.8,1774.0 381.2,1775.7 340.1,1632.0 327.3,1515.5 329.0,908.1 326.4,151.2 1296.0,148.9 1344.9,149.2 1365.9,956.1 1344.2,1777.0 1303.2,1777.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0568/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[812.0,958.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4090473,37.7605471]}},{"type":"Feature","properties":{"resourceCoords":[812.0,150.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4091697,37.7618251]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0569/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p569","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.45"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0569/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0569","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"172.9,957.6 153.7,176.0 168.9,176.2 560.0,179.2 1017.9,182.6 1057.5,165.4 1541.8,185.8 1541.9,225.0 1539.5,1695.5 1541.7,1709.3 1548.0,1719.2 615.4,1798.3 615.5,1751.5 557.9,1751.5 508.4,1751.6 150.8,1752.8 172.9,957.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0569/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[125.0,1787.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40790621808794,37.75925627607042]}},{"type":"Feature","properties":{"resourceCoords":[125.0,968.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40803672540976,37.76059344233849]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0570/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p570","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0570/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0570","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"85.0,147.7 146.2,148.7 519.5,154.7 573.8,155.7 1543.0,156.4 1541.8,1778.2 572.0,1777.0 513.0,1777.2 141.2,1774.5 92.9,1752.8 85.7,1741.4 83.4,1727.0 85.1,199.5 85.0,147.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0570/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4041442,37.7608389]}},{"type":"Feature","properties":{"resourceCoords":[572.0,1777.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4040206,37.7595642]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0571/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p571","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.61"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0571/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0571","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"127.2,1758.3 128.0,166.0 623.6,173.9 1090.0,166.0 1549.2,166.0 1580.0,166.0 1598.1,964.0 1565.3,964.0 1559.9,1758.7 601.8,1767.0 127.2,1758.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0571/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1090.0,166.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.400389,37.762346]}},{"type":"Feature","properties":{"resourceCoords":[128.0,166.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.402337,37.7622284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0572/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p572","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0572/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0572","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"89.9,962.4 123.1,962.4 104.3,153.6 113.6,153.5 572.7,152.8 1535.7,151.8 1533.5,1716.7 1544.1,1768.6 573.0,1769.0 84.9,1768.0 89.9,962.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0572/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[573.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3983381,37.7611851]}},{"type":"Feature","properties":{"resourceCoords":[573.0,1769.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3982161,37.7599106]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0573/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p573","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0573/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0573","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"114.3,1722.4 110.1,164.7 591.2,162.8 1063.5,154.5 1563.0,158.0 1567.2,1018.8 1564.0,1759.9 1073.5,1765.0 598.0,1772.8 125.0,1774.0 114.3,1722.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0573/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[125.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3962762,37.7600273]}},{"type":"Feature","properties":{"resourceCoords":[1563.0,158.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3936217,37.7627555]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0574/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p574","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.43"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0574/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0574","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1058.3,1791.3 387.4,1772.8 142.7,1768.6 157.8,1078.8 167.9,277.4 633.8,285.5 629.1,164.1 1079.7,235.5 1079.6,292.0 1524.0,298.2 1509.8,1440.1 1493.1,1721.1 1497.5,1803.5 1058.3,1791.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0574/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1078.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39153021476032,37.76172502260333]}},{"type":"Feature","properties":{"resourceCoords":[141.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39354772636409,37.76158261613419]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0575/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p575","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.59"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0575/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0575","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"104.5,1694.1 118.0,1394.3 116.0,177.4 593.2,175.8 709.2,172.2 1036.2,173.7 1088.0,158.7 1454.8,151.9 1542.0,164.4 1542.1,262.6 1596.3,262.1 1522.1,502.2 1589.3,954.4 1571.8,1636.4 1627.6,1638.7 1565.3,1762.4 1301.4,1767.8 585.5,1768.2 530.6,1783.7 110.4,1781.8 104.5,1694.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0575/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[580.0,1778.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38951619692867,37.760422353964856]}},{"type":"Feature","properties":{"resourceCoords":[1543.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38769247052042,37.761842924897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0576/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p576","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.32"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0576/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0576","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1507.9,349.2 1521.2,1820.6 263.6,1814.9 290.2,249.2 74.6,278.0 132.5,118.1 594.2,23.6 1531.4,55.6 1605.9,174.8 1598.3,349.0 1507.9,349.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0576/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[809.0,1830.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3860005,37.7542239]}},{"type":"Feature","properties":{"resourceCoords":[1513.0,1830.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3858824,37.7529706]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0577/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p577","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0577/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0577","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"144.7,1868.5 1232.6,1876.4 1284.0,1877.0 1298.1,1877.2 1349.8,973.8 1323.2,973.4 1347.0,73.2 1309.4,73.0 1254.5,73.4 1255.7,25.0 1255.8,1.0 259.9,1.0 137.6,524.5 204.8,713.4 193.2,1627.2 157.4,1860.5 144.7,1868.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0577/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[832.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4198446928033,37.756986820610344]}},{"type":"Feature","properties":{"resourceCoords":[832.0,1858.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4196698377721,37.755413807869665]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0578/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p578","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0578/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0578","type":"ImageService3","width":1659,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1251.8,1869.2 541.1,1872.9 294.7,1873.9 332.2,975.7 305.8,975.7 315.6,81.3 546.9,79.3 1245.4,74.8 1277.6,74.8 1300.9,974.3 1317.7,974.3 1258.6,1869.2 1251.8,1869.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0578/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[818.0,1869.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41744338644331,37.75552851106358]}},{"type":"Feature","properties":{"resourceCoords":[818.0,84.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41773461368746,37.75871179454623]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0579/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p579","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0579/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0579","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1329.0,1863.3 1268.8,1863.5 1219.2,1863.5 697.7,1865.7 308.5,1865.5 368.4,968.9 351.7,968.9 329.1,67.3 453.1,67.3 1270.5,65.0 1340.3,64.8 1275.4,965.2 1293.0,965.1 1329.0,1863.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0579/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[825.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4154355723333,37.75725654462394]}},{"type":"Feature","properties":{"resourceCoords":[825.0,1857.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4152884636882,37.75566747356562]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0580/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p580","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0580/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0580","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"315.7,968.8 298.1,968.8 369.5,73.9 680.7,75.6 1204.6,79.3 1257.8,79.6 1289.3,79.6 1327.0,973.6 1338.2,973.6 1271.9,1866.6 1247.2,1866.5 1196.3,1866.3 680.5,1864.2 344.7,1862.3 315.7,968.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0580/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[818.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41324510999584,37.757382377489854]}},{"type":"Feature","properties":{"resourceCoords":[818.0,82.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4134077955414,37.75897397289196]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0581/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p581","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0581/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0581","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1003.2,1846.2 614.2,1848.2 311.5,1850.5 368.0,980.9 357.0,980.9 311.5,111.1 546.4,109.1 933.9,105.3 1035.0,107.1 1419.2,105.6 1426.9,158.7 1434.7,1846.3 1003.2,1846.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0581/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.4130799616973,37.75920968558274]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.4092880786517,37.75942564457801]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.4089661245674,37.75584212595457]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41275800761302,37.75562616695931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0583/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p583","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0583/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0583","type":"ImageService3","width":1631,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1429.7,1842.3 240.4,1854.0 222.4,165.6 214.3,112.5 605.8,107.2 1013.6,106.1 1369.3,100.9 1413.5,100.3 1422.9,1005.2 1426.7,1477.3 1429.7,1842.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0583/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41029703663153,37.75938329104152]}},{"type":"Feature","properties":{"resourceCoords":[1631.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.406531030251,37.7595793493989]}},{"type":"Feature","properties":{"resourceCoords":[1631.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40623677160045,37.75599629890624]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41000277798098,37.755800240548865]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0584/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p584","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0584/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0584","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"149.7,1186.1 142.2,262.1 194.4,261.6 194.8,304.1 1040.5,223.8 1041.0,224.8 1083.5,243.4 1408.3,242.6 1412.7,242.6 1459.8,241.9 1462.5,474.4 1493.3,560.2 1477.5,599.6 1437.0,607.9 1432.0,609.9 1429.8,610.7 1417.2,630.8 1435.0,668.3 1438.9,742.1 1415.9,782.1 1442.0,802.7 1446.0,877.7 1417.4,922.8 1449.4,943.0 1491.1,1739.2 1442.6,1809.3 1439.7,1796.6 1411.6,1715.9 208.8,1685.5 208.8,1668.0 152.5,1668.1 149.7,1186.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0584/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[176.0,1149.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4068055,37.7577763]}},{"type":"Feature","properties":{"resourceCoords":[1048.0,1664.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4047413,37.7569544]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0585/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p585","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.43"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0585/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0585","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"188.0,857.0 156.4,832.9 190.4,788.3 193.1,709.5 167.6,685.6 195.3,645.8 197.9,568.3 182.7,527.4 197.7,507.6 205.5,505.2 248.7,500.3 268.8,460.5 244.3,367.9 262.6,124.5 1149.6,194.0 1591.1,236.2 1513.8,1153.5 1471.3,1723.6 585.0,1656.0 582.0,1706.7 160.2,1669.4 188.0,857.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0585/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1088.0,926.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4019814,37.75842]}},{"type":"Feature","properties":{"resourceCoords":[585.0,1656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4028192,37.7570482]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0586/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p586","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0586/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0586","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1516.1,188.9 1511.5,1229.2 1509.9,1598.1 1509.8,1638.8 1065.5,1719.7 1065.4,1720.9 144.1,1726.4 139.8,1142.4 141.8,201.8 1056.5,189.8 1516.1,188.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0586/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[116.0,1144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40104133130323,37.75813993129558]}},{"type":"Feature","properties":{"resourceCoords":[1542.0,246.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39815244865778,37.759818053499586]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0587/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p587","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0587/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0587","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1575.5,1554.0 1047.9,1659.2 1047.5,1681.4 126.2,1634.2 129.5,1284.4 139.2,237.3 1059.8,237.9 1510.3,239.1 1509.3,1420.8 1513.7,1461.5 1575.5,1554.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0587/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,1197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39607856522895,37.758432142913186]}},{"type":"Feature","properties":{"resourceCoords":[1540.0,1197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39510927855753,37.75849094632137]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0588/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p588","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0588/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0588","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"549.0,247.2 994.1,231.4 1232.8,225.4 1507.4,221.3 1506.9,1681.5 1471.8,1682.3 1194.8,1689.6 981.9,1699.5 360.9,1717.4 313.8,1651.3 155.8,1429.6 150.5,1391.0 117.7,264.9 549.0,247.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0588/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[104.0,1363.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39524359563391,37.75815946491093]}},{"type":"Feature","properties":{"resourceCoords":[1535.0,1670.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39204305992804,37.757738949483816]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0589/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p589","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0589/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0589","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"179.9,1660.1 218.0,166.6 606.6,170.6 1045.0,175.2 1438.4,175.6 1489.8,161.0 1489.3,886.6 1494.7,1594.8 1493.8,1657.5 1442.0,1657.4 535.1,1661.2 183.1,1660.1 179.9,1660.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0589/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1044.0,1660.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3902368,37.7578228]}},{"type":"Feature","properties":{"resourceCoords":[144.0,1660.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3921817,37.7577122]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0590/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p590","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0590/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0590","type":"ImageService3","width":1663,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"809.5,214.1 1052.5,210.5 1110.5,96.9 1508.0,115.2 1524.3,202.0 1462.0,214.5 1466.4,642.8 1460.2,687.4 1455.5,707.8 1449.4,734.5 1439.1,791.0 1444.5,855.2 1472.7,897.0 1473.2,897.4 1547.1,1685.7 1067.3,1684.3 912.9,1679.8 652.2,1683.5 141.7,1682.4 143.1,1620.8 143.9,924.4 150.5,210.9 809.5,214.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0590/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.3898745,37.7607837]}},{"type":"Feature","properties":{"resourceCoords":[1663.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.386222,37.7610167]}},{"type":"Feature","properties":{"resourceCoords":[1663.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.3858766,37.7576325]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.3895291,37.7573995]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0593/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p593","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0593/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0593","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"553.9,1656.8 445.9,858.1 445.2,857.7 414.9,816.4 406.7,751.3 414.8,693.4 423.8,645.0 428.3,599.4 406.0,164.0 609.3,155.4 609.3,154.2 1184.9,135.1 1273.0,164.0 1292.3,674.7 1313.8,673.9 1288.7,1592.3 1260.2,1593.4 1088.2,1606.9 876.1,1644.5 553.9,1656.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0593/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[406.0,164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3866253,37.7606161]}},{"type":"Feature","properties":{"resourceCoords":[1273.0,164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38475,37.7606747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0594/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p594","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.27"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0594/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0594","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.0,184.0 67.6,688.4 88.8,688.1 39.9,1593.5 94.8,1592.8 540.1,1936.6 616.0,1938.4 617.6,1913.4 1601.8,1885.0 1633.9,460.4 1580.5,90.4 1350.7,28.4 480.8,95.5 249.5,56.8 48.2,152.6 1.0,161.6 1.0,162.1 62.0,184.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0594/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[486.0,1594.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3836175,37.7582837]}},{"type":"Feature","properties":{"resourceCoords":[62.0,184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38475,37.7606747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0595/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p595","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0595/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0595","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1425.5,80.0 1428.7,921.4 1431.0,1888.5 1431.1,1923.1 1319.0,1929.0 1064.0,1923.0 928.0,1929.0 682.0,1926.0 505.0,1931.0 407.1,1930.4 390.7,1878.8 201.0,1820.3 143.7,1480.5 207.7,1216.7 207.9,187.6 360.1,88.2 1425.5,80.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0595/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[496.0,1854.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.42060104100891,37.75211225921312]}},{"type":"Feature","properties":{"resourceCoords":[833.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41997717462917,37.75375564380526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0596/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p596","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0596/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0596","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"241.5,929.7 237.7,81.9 288.4,81.7 547.1,80.7 1253.1,76.7 1306.5,76.6 1296.5,968.6 1316.0,968.6 1277.6,1860.7 1276.6,1860.7 1132.8,1861.3 958.3,1862.0 958.8,1900.9 959.0,1933.0 797.0,1932.0 680.0,1937.0 338.0,1930.0 244.6,1935.1 244.6,1904.2 241.5,929.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0596/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[820.0,976.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41730131880672,37.75391368464406]}},{"type":"Feature","properties":{"resourceCoords":[820.0,83.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41744729641299,37.755516837493275]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0597/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p597","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.75"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0597/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0597","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1091.2,1857.7 767.6,1859.1 691.9,1859.5 324.8,1860.9 363.0,972.3 343.5,972.2 353.4,83.8 691.2,83.4 1206.2,80.7 1205.3,927.5 1209.2,1857.2 1091.2,1857.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0597/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[834.0,1850.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41495873048963,37.75247012590644]}},{"type":"Feature","properties":{"resourceCoords":[834.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41524743120513,37.755645771195425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0598/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p598","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0598/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0598","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"457.6,938.4 457.9,92.8 506.9,92.6 899.2,91.1 1410.7,88.4 1413.7,404.7 1415.1,1434.0 1429.1,1860.1 1170.7,1863.3 462.0,1866.8 457.6,938.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0598/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[829.0,1856.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41326633914248,37.752572356771864]}},{"type":"Feature","properties":{"resourceCoords":[829.0,91.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41355344688118,37.75575812819016]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0599/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p599","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0599/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0599","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"226.1,1422.7 222.3,419.6 218.7,111.5 268.2,111.1 592.6,108.0 978.8,105.2 1407.0,104.3 1408.4,538.8 1424.6,816.2 1426.7,1087.1 1417.5,1201.3 1421.8,1831.5 240.8,1837.8 226.1,1422.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0599/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41275277536351,37.75601604836296]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40893201626122,37.75622719228299]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40861725300421,37.75261624141871]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.4124380121065,37.75240509749867]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0600/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p600","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.48"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0600/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0600","type":"ImageService3","width":1660,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1275.5,1839.8 1015.6,1841.6 631.6,1840.3 598.8,1840.0 229.3,1837.8 231.2,1206.9 241.4,1092.7 242.0,821.5 228.4,543.6 231.3,108.7 1412.3,113.2 1410.3,975.7 1354.0,975.5 1322.0,1839.4 1275.5,1839.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0600/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.4100190902227,37.75617092875838]}},{"type":"Feature","properties":{"resourceCoords":[1660.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40616337482496,37.75641376083783]}},{"type":"Feature","properties":{"resourceCoords":[1660.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40580529797836,37.752809283572816]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40966101337611,37.752566451493365]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0602/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p602","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0602/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0602","type":"ImageService3","width":1670,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"145.0,1672.4 143.7,1512.8 140.4,609.6 140.2,230.0 197.6,230.2 197.4,247.9 1422.3,285.6 1450.4,367.9 1462.6,422.6 1477.8,576.1 1484.0,1342.5 1481.2,1667.2 1484.4,1927.5 1462.0,1928.0 1450.8,1927.9 1083.2,1667.7 1053.2,1667.6 145.0,1672.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0602/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[178.0,1503.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40648893579852,37.75459445667027]}},{"type":"Feature","properties":{"resourceCoords":[1474.0,1668.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40356589752423,37.754468936930294]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0603/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p603","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0603/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0603","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"146.7,1336.2 146.8,533.2 132.1,372.1 122.7,328.4 175.5,254.3 174.6,229.8 604.9,236.2 604.1,184.6 1507.6,187.3 1511.5,1583.1 1510.9,1694.1 1053.9,1684.7 470.4,1682.7 313.9,1681.2 302.1,1933.5 260.0,1932.0 224.0,1932.5 230.5,1679.6 141.1,1676.5 146.7,1336.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0603/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[580.0,1662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40261686267287,37.754555191703034]}},{"type":"Feature","properties":{"resourceCoords":[580.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4028597475222,37.756938096332945]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0604/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p604","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0604/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0604","type":"ImageService3","width":1670,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1054.8,1683.9 1054.9,1652.6 818.9,1938.1 711.0,1939.0 710.0,1948.0 607.5,1948.0 598.0,1908.4 548.5,1814.2 547.8,1698.8 131.8,1696.4 132.7,1583.5 131.9,163.7 1064.2,168.3 1064.3,167.1 1514.8,90.2 1514.1,132.8 1522.1,888.2 1513.0,1689.0 1054.8,1683.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0604/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1081.0,1676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39864216744732,37.7547915492162]}},{"type":"Feature","properties":{"resourceCoords":[1540.0,1676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3976805699213,37.75485453081292]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0605/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p605","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0605/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0605","type":"ImageService3","width":1642,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"150.7,940.2 154.3,243.8 156.7,166.6 157.3,146.8 1009.9,209.1 1010.8,188.6 1501.7,101.8 1533.6,151.8 1514.3,1728.7 1411.1,1739.8 1412.3,1717.9 914.2,1693.4 860.6,1701.8 695.1,1695.8 632.6,1719.0 578.0,1782.8 520.5,1745.3 439.5,1709.8 364.8,1689.4 284.0,1681.5 130.7,1678.1 150.7,940.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0605/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1094.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39586915487614,37.757566143947564]}},{"type":"Feature","properties":{"resourceCoords":[136.0,1662.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39772636148183,37.75485926921502]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0606/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p606","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.03"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0606/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0606","type":"ImageService3","width":1670,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1578.0,420.1 1612.0,521.5 1599.5,700.4 1594.5,975.8 1596.9,1087.5 1581.0,1089.0 1583.0,1139.0 1598.0,1139.0 1602.7,1348.4 1578.8,1483.0 1589.3,1773.5 1082.9,1783.2 1082.9,1777.7 201.4,1798.8 188.3,73.0 254.9,173.0 306.3,250.3 1016.6,252.6 1260.2,249.0 1577.2,250.8 1578.0,420.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0606/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1085.0,251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3931329,37.7576527]}},{"type":"Feature","properties":{"resourceCoords":[581.0,251.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.394107,37.757592]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0607/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p607","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0607/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0607","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"220.4,258.4 554.7,259.4 1415.5,255.5 1431.7,255.5 1480.2,1674.5 1461.4,1674.7 1047.4,1676.4 580.8,1673.8 208.2,1676.4 206.4,1634.6 192.2,1304.8 211.7,1190.4 202.4,873.9 205.1,640.0 214.6,487.9 185.1,402.0 183.4,258.2 220.4,258.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0607/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[629.0,1674.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3909362,37.7552216]}},{"type":"Feature","properties":{"resourceCoords":[626.0,259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.391174,37.757768]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0608/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p608","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0608/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0608","type":"ImageService3","width":1670,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1531.7,233.1 1492.1,1731.7 1020.2,1657.2 1020.1,1690.1 670.5,1693.3 249.5,1692.4 157.1,1692.5 110.2,239.5 144.0,239.7 648.6,237.2 906.2,231.8 1058.9,235.1 1531.7,233.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0608/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1078.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38707049350793,37.75673347261302]}},{"type":"Feature","properties":{"resourceCoords":[119.0,248.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38931926796629,37.757864443828566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0609/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p609","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.10"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0609/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0609","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"713.5,33.3 473.3,1.0 409.1,1.0 154.3,1537.3 1.0,1515.8 1.0,1517.0 11.3,1531.3 15.0,1532.0 15.0,1536.3 1653.0,1790.8 1653.0,1576.2 1631.2,1564.8 1522.2,1328.4 1603.3,1163.2 1557.8,666.6 1602.7,457.4 1531.2,445.2 1157.6,58.4 1078.9,47.9 916.8,32.7 713.5,33.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0609/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[622.0,1446.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.385007,37.7555761]}},{"type":"Feature","properties":{"resourceCoords":[1022.0,45.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3847844,37.758213]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0611/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p611","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0611/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0611","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1414.0,11.0 1331.0,9.0 1330.1,1.0 1151.9,1.0 1151.0,9.0 1133.0,9.0 1132.1,1.0 305.9,1.0 305.0,14.0 283.0,14.0 282.1,1.0 259.9,1.0 259.0,18.0 199.0,16.0 167.0,17.2 177.5,50.8 118.0,827.0 189.8,1089.7 172.3,1676.2 277.8,1858.8 272.7,1925.2 307.0,1925.0 412.0,1931.0 750.0,1927.0 934.0,1932.0 1057.0,1928.0 1298.0,1937.0 1415.5,1932.9 1415.4,1819.0 1412.9,966.0 1413.7,103.0 1414.0,11.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0611/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[826.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4194007,37.7505801]}},{"type":"Feature","properties":{"resourceCoords":[230.0,966.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4205077,37.750513]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0612/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p612","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0612/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0612","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"909.6,20.1 927.0,21.0 1000.4,19.7 1174.5,28.7 1271.2,26.7 1271.1,39.9 1270.5,86.5 1264.4,411.6 1249.7,488.5 1204.0,589.0 1171.4,638.6 1292.7,648.1 1496.9,801.6 1411.9,1268.2 1490.4,1320.7 1436.5,1746.9 847.8,1648.0 566.1,1750.9 472.6,1863.5 335.6,1873.7 169.1,1790.5 188.2,1580.4 115.9,1482.3 207.4,1203.9 231.3,192.5 321.4,117.5 329.6,26.5 337.4,26.6 343.0,27.0 458.0,27.0 627.0,15.0 875.2,20.3 909.6,20.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0612/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[723.0,1334.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41913630351385,37.746806065703986]}},{"type":"Feature","properties":{"resourceCoords":[1392.0,131.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41787430697597,37.74906005667106]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0613/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p613","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0613/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0613","type":"ImageService3","width":1654,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"229.9,100.0 229.2,972.1 231.8,1834.0 231.9,1914.1 535.5,1865.7 821.3,1924.6 903.0,1933.0 1037.0,1927.0 1206.6,1932.8 1300.5,972.1 1279.7,972.1 1200.0,1.0 1153.9,1.0 1153.0,9.0 1137.0,9.0 1136.1,1.0 230.2,1.0 229.9,100.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0613/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[822.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4172209,37.7507122]}},{"type":"Feature","properties":{"resourceCoords":[1416.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.416129,37.7507783]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0614/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p614","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0614/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0614","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"378.9,969.8 362.1,969.8 294.2,188.0 223.9,188.3 223.4,125.3 222.9,86.6 285.4,86.3 396.3,85.9 539.1,85.3 906.2,83.9 981.8,83.4 1230.3,82.3 1305.6,964.8 1294.6,964.9 1272.0,1853.9 1182.2,1853.5 954.0,1852.7 371.4,1858.0 296.3,1858.4 231.3,1858.8 231.2,1756.4 305.8,1756.0 378.9,969.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0614/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[824.0,972.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41532346321303,37.75081889082947]}},{"type":"Feature","properties":{"resourceCoords":[824.0,1859.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41517800709707,37.749215906501334]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0615/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p615","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0615/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0615","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1442.5,1740.5 967.4,1783.2 967.3,1850.7 548.2,1851.8 340.4,1850.4 339.5,1850.4 365.0,968.8 375.9,968.8 304.2,93.2 377.9,93.2 494.5,93.1 1196.5,92.4 1452.5,90.2 1442.3,967.6 1442.5,1614.5 1442.5,1740.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0615/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[863.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41310143678852,37.75095875758613]}},{"type":"Feature","properties":{"resourceCoords":[225.0,1851.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.41441862493832,37.749266460423954]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0616/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p616","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0616/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0616","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1407.9,93.5 1411.6,965.4 1417.4,1838.4 1012.3,1841.2 214.7,1852.5 214.3,1807.2 212.9,1617.8 208.4,973.9 212.7,100.5 1407.9,93.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0616/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41240078184126,37.75279924546823]}},{"type":"Feature","properties":{"resourceCoords":[1657.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40859079706705,37.753008384637035]}},{"type":"Feature","properties":{"resourceCoords":[1657.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40828185900563,37.749440047645706]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.41209184377983,37.7492309084769]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0618/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p618","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0618/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0618","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"594.0,95.5 627.2,95.6 1016.0,95.8 1279.0,93.2 1368.5,92.3 1412.7,87.5 1409.5,579.6 1410.1,773.0 1421.1,954.6 1528.2,1629.0 1508.7,1638.8 1043.1,1800.2 1053.6,1832.8 1020.0,1843.5 843.0,1844.2 627.6,1845.0 216.9,1841.5 217.4,967.3 220.0,94.2 594.0,95.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0618/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40967015527207,37.75294730135999]}},{"type":"Feature","properties":{"resourceCoords":[1657.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40586731203646,37.75317797109605]}},{"type":"Feature","properties":{"resourceCoords":[1657.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40552656697932,37.74961634652885]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.40932941021494,37.74938567679279]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0619/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p619","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.33"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0619/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0619","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"270.1,979.8 301.4,93.2 358.9,93.2 359.4,249.6 1249.5,249.0 1278.9,249.2 1642.0,508.8 1642.0,1416.2 1543.2,1415.9 1363.8,1671.3 459.1,1668.9 353.7,1669.5 353.3,1473.4 357.2,974.5 312.9,979.4 270.1,979.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0619/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[826.0,964.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4053461,37.7530682]}},{"type":"Feature","properties":{"resourceCoords":[826.0,1670.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.405222,37.7517957]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0621/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p621","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0621/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0621","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"247.6,1726.0 248.0,1682.0 659.8,1686.9 1068.0,1685.1 1135.2,1708.2 1626.2,1535.2 1642.0,1539.4 1642.0,509.6 1526.1,510.5 1517.0,473.6 1471.1,388.1 1469.7,282.9 1090.5,283.6 666.6,277.2 125.6,278.3 1.0,277.8 1.0,313.1 12.0,314.0 12.0,331.0 1.0,331.9 1.0,626.1 12.0,627.0 12.0,653.0 1.0,654.8 1.0,676.1 12.0,677.0 12.0,748.0 1.0,748.9 1.0,758.0 8.0,758.0 10.0,768.0 19.0,769.0 19.0,785.0 13.0,786.0 13.0,797.0 1.0,797.9 1.0,820.1 15.0,822.0 15.0,849.0 1.0,850.9 1.0,872.0 20.0,872.0 21.0,901.0 1.0,902.0 1.0,921.2 21.0,925.0 21.0,948.0 15.0,952.0 17.0,1006.0 1.0,1009.8 1.0,1027.2 17.0,1031.0 16.0,1052.0 10.0,1061.0 1.0,1061.0 1.0,1074.2 16.0,1078.0 17.0,1104.0 9.0,1105.0 10.0,1121.0 19.0,1122.0 19.0,1158.0 1.0,1159.9 1.0,1181.0 18.0,1182.0 20.0,1209.0 14.0,1210.0 15.0,1232.0 21.0,1234.0 21.0,1257.0 16.2,1257.7 247.6,1726.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0621/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[248.0,1682.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.402323,37.75197]}},{"type":"Feature","properties":{"resourceCoords":[248.0,278.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4025654,37.7545227]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0623/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p623","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0623/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0623","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1538.2,1427.7 1537.0,1827.7 1308.8,1826.8 1311.4,1902.7 1324.0,1931.9 1064.0,1926.0 802.0,1929.0 781.0,1925.0 725.0,1928.0 673.0,1924.0 539.0,1932.0 377.0,1931.0 295.0,1924.0 197.7,1924.5 71.8,1821.2 100.7,1821.2 103.8,1398.5 104.2,1245.0 110.6,1164.1 129.5,1088.9 163.5,1007.1 199.9,949.0 134.9,895.5 110.5,833.4 113.3,667.8 103.9,614.3 118.7,115.4 1452.9,163.2 1439.0,167.4 1539.2,835.5 1538.3,1379.1 1538.2,1427.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0623/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1525.0,1829.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3984571679638,37.75221543987359]}},{"type":"Feature","properties":{"resourceCoords":[1525.0,121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39457703279714,37.75245834975035]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0624/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p624","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.64"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0624/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0624","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"84.0,1587.8 115.1,251.1 219.9,236.4 217.6,124.5 981.0,96.9 981.0,101.8 1419.5,88.0 1423.6,172.6 1425.6,215.2 1506.3,1663.5 1394.5,1664.8 907.8,1666.8 491.6,1676.2 105.0,1674.0 90.2,1607.6 84.0,1587.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0624/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[556.0,1674.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.393619,37.752485]}},{"type":"Feature","properties":{"resourceCoords":[105.0,1674.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3946262,37.752432]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0625/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p625","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0625/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0625","type":"ImageService3","width":1643,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1181.1,1718.6 416.1,1821.4 350.9,1830.0 83.8,332.6 478.6,279.9 974.0,219.8 1412.9,162.3 1526.0,910.0 1554.4,1124.9 1614.5,1666.5 1181.1,1718.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0625/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1068.0,946.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3898673,37.754039]}},{"type":"Feature","properties":{"resourceCoords":[1526.0,910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.388887,37.7540576]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0626/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p626","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0626/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0626","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"185.1,1666.6 194.3,1159.5 193.8,957.8 179.0,254.0 287.6,254.0 696.9,255.4 1036.8,252.6 1036.8,220.7 1495.5,293.5 1492.5,402.9 1336.6,402.4 1354.3,420.9 1470.9,422.9 1465.1,1661.2 1037.8,1665.0 989.7,1681.4 672.5,1686.3 582.1,1658.2 239.1,1665.5 185.1,1666.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0626/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1456.0,960.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3860005,37.7542239]}},{"type":"Feature","properties":{"resourceCoords":[179.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3890412,37.7553279]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p627 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"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":"3710.0"},{"label":"split_canvas_w","value":"6576.0"},{"label":"split_canvas_h","value":"4086.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"92.0,1717.7 251.2,1830.6 710.0,1821.4 1374.3,1924.0 1538.7,1899.7 1574.0,1687.3 1574.0,1113.4 1574.0,1068.1 1574.1,1004.1 1100.1,1046.0 1100.0,1113.3 682.0,1113.7 474.8,1112.0 385.0,1111.3 159.3,1109.3 160.2,1288.9 147.6,1317.2 101.6,1351.8 87.8,1382.7 92.0,1717.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[629.0,1113.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4137963,37.7493025]}},{"type":"Feature","properties":{"resourceCoords":[1574.0,1113.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4116135,37.7494348]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p627 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"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":"6576.0"},{"label":"split_canvas_h","value":"3710.0"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"364.4,869.3 369.4,837.7 804.0,777.9 1470.5,800.6 1486.6,811.8 1479.2,474.9 1492.8,443.8 1538.8,408.6 1551.2,380.0 1548.6,199.5 969.2,207.3 829.8,208.7 829.3,106.9 903.5,106.2 904.6,93.2 768.9,89.8 661.7,95.6 596.2,89.5 367.1,44.4 124.6,85.4 125.5,172.1 127.0,491.5 114.3,567.4 71.8,667.2 40.8,716.7 160.2,723.1 364.4,869.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0627__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1073.0,205.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4159742,37.7491743]}},{"type":"Feature","properties":{"resourceCoords":[1486.0,751.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4149402,37.7482325]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p628 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"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":"3697.2"},{"label":"split_canvas_w","value":"6596.0"},{"label":"split_canvas_h","value":"4098.8"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"20.1,1616.2 47.4,1621.3 50.9,1743.9 244.9,1892.4 1295.9,1870.7 1322.7,1889.0 1334.2,1891.2 1367.4,1844.3 1397.0,1849.8 1557.1,1239.0 1494.7,1247.8 1001.5,1249.8 1000.6,1284.3 965.4,1283.5 867.9,1250.4 797.9,1226.5 594.0,1157.2 207.0,1020.3 171.9,1052.4 117.2,1216.1 127.8,1246.2 69.7,1420.2 82.9,1446.8 20.1,1616.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[594.0,1157.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4079073,37.7496631]}},{"type":"Feature","properties":{"resourceCoords":[207.0,1020.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4088504,37.7496123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p628 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.42"},{"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":"6596.0"},{"label":"split_canvas_h","value":"3697.2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.0,753.8 1058.1,917.0 1535.0,850.1 1540.9,639.2 1516.3,614.9 1515.2,400.6 1492.2,371.2 1491.3,169.8 1518.0,121.0 1044.8,118.7 113.0,121.0 117.0,753.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0628__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[113.0,121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4116135,37.7494348]}},{"type":"Feature","properties":{"resourceCoords":[1518.0,121.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4088504,37.7496123]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0629/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p629","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0629/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0629","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1593.5,1778.1 1518.7,1870.6 1261.4,1881.6 492.7,1869.5 295.2,1815.8 307.1,1814.0 323.3,1758.0 353.6,1753.5 303.9,1114.1 266.6,1133.2 157.2,444.3 145.8,258.7 252.1,257.8 1164.2,258.0 1330.9,19.4 1529.2,23.2 1498.7,1585.3 1518.0,1588.8 1549.7,1597.1 1510.2,1626.0 1389.3,1621.4 1345.6,1630.0 1312.2,1660.0 1350.7,1650.8 1435.2,1649.1 1643.0,1677.0 1643.0,1775.6 1593.5,1778.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0629/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[622.0,258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.405222,37.7517957]}},{"type":"Feature","properties":{"resourceCoords":[1048.0,258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4042586,37.7518525]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0630/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p630","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.68"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0630/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0630","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"29.9,1635.2 74.5,1626.3 197.7,1630.6 237.9,1601.1 205.5,1592.7 202.1,1592.1 185.9,1589.1 212.4,21.1 470.6,28.5 595.2,278.6 595.5,233.0 1022.5,236.8 1445.7,233.6 1441.8,294.1 1443.0,735.4 1480.2,975.0 1446.0,988.5 1452.4,1690.8 1496.3,1837.5 468.3,1775.7 334.5,1782.7 333.2,1682.2 121.3,1654.3 35.2,1656.3 29.9,1635.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0630/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[560.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.4023984713918,37.751928682011695]}},{"type":"Feature","properties":{"resourceCoords":[108.0,254.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.40340133993054,37.75187166784668]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0631/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p631","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.61"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0631/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0631","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1550.7,1862.1 1506.0,1685.0 1566.9,1684.4 1549.8,881.9 1533.4,881.9 1502.1,256.1 1493.9,256.2 1092.0,258.0 1091.2,28.8 1015.0,31.9 975.5,49.3 868.2,106.6 877.2,1.0 798.2,1.0 798.6,111.0 781.5,106.6 282.9,284.0 214.5,260.8 210.8,320.2 212.0,753.0 248.5,987.9 215.0,1001.2 221.3,1689.9 264.4,1833.9 547.9,1851.0 997.5,1785.2 1550.7,1862.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0631/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1092.0,883.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3983505,37.751076]}},{"type":"Feature","properties":{"resourceCoords":[1092.0,258.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.398452,37.752194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0632/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p632","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0632/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0632","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"176.8,256.6 718.5,254.4 1383.6,150.7 1393.8,184.0 1407.8,249.1 1426.3,842.3 1433.8,842.2 1442.7,1671.2 1501.7,1674.3 1336.0,1804.8 262.6,1766.3 182.2,1849.7 138.2,1674.0 198.6,1673.5 182.8,877.4 166.6,877.4 136.4,256.7 176.8,256.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0632/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[570.0,878.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39643185517266,37.75118701199311]}},{"type":"Feature","properties":{"resourceCoords":[570.0,1663.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39630053491635,37.749771381631554]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0633/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p633","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.71"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0633/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0633","type":"ImageService3","width":1644,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"287.6,1699.9 227.6,1695.7 232.8,850.3 225.1,850.2 216.7,245.1 602.2,256.4 1017.7,256.8 1503.3,266.4 1548.2,266.9 1562.8,1649.3 1588.0,1649.6 1643.0,1656.3 1643.0,1761.7 1583.8,1751.7 1555.6,1894.2 992.8,1782.3 444.5,1847.3 116.4,1830.0 287.6,1699.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0633/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39382923424344,37.75246235027455]}},{"type":"Feature","properties":{"resourceCoords":[572.0,1672.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.39354425475932,37.749968805276694]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0634/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p634","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.50"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0634/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0634","type":"ImageService3","width":1647,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"232.8,1633.8 207.8,1633.5 195.5,267.7 323.3,269.4 1049.1,278.6 1459.5,289.4 1466.6,289.4 1435.0,999.0 1452.0,999.2 1439.6,1749.1 1375.1,1742.0 1058.6,1818.5 913.0,1759.8 607.4,1799.7 287.9,1744.8 288.0,1640.7 232.8,1633.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0634/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1031.0,1694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38946266102332,37.7501940836923]}},{"type":"Feature","properties":{"resourceCoords":[1464.0,1694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38848394464492,37.75026524514949]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0635/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p635","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0635/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0635","type":"ImageService3","width":1649,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"271.5,275.3 614.6,271.9 704.7,301.0 1021.8,299.7 1070.1,283.9 1461.6,284.9 1462.8,1688.4 1475.1,1688.6 1474.2,1798.8 911.9,1795.1 206.1,1720.5 214.1,978.4 197.3,978.2 224.6,275.7 271.5,275.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0635/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1472.0,1676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38564398511917,37.75044035074137]}},{"type":"Feature","properties":{"resourceCoords":[1047.0,262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.38689345468315,37.7529287607888]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0636/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"San Francisco, California | 1950 | sanborn00813_035 p636","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.18"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T02:11:10Z","modified":"2026-10-17T02:11:10Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0636/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0636","type":"ImageService3","width":1657,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"200.0,1672.0 187.8,1671.9 173.5,270.3 379.2,268.9 1656.0,260.4 1656.0,272.5 1656.0,349.2 1589.6,346.3 1516.7,1100.7 1573.7,1328.7 1571.0,1850.0 1136.7,1779.4 200.1,1782.0 200.0,1672.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd436m:g4364m:g4364sm:g4364sm_g00813195006:00813_06_1950-0636/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1672.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3856344,37.750418]}},{"type":"Feature","properties":{"resourceCoords":[200.0,262.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.3858824,37.7529706]}}]}}]}