{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03985_048.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1949 | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"102"},{"label":"placed","value":"80"},{"label":"unplaced","value":"22"},{"label":"fit sources","value":"georef-snap 39, georef 37, snap:0 2, georef-street 1, snap:2 1"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"14 sheet(s) cut into 30 panels"},{"label":"unplaced pages","value":"p2__3 (tier 1, 42.37542,-83.02565 +/-100m); p30__2 (tier 1, 42.37739,-83.01602 +/-100m); p37 (tier 1, 42.37535,-83.04249 +/-258m); p38 (tier 1, 42.37748,-83.03765 +/-261m); p42 (tier 2, 42.37889,-83.03138 +/-1437m); p48 (tier 1, 42.38473,-83.02058 +/-252m); p60__2 (tier 1, 42.39394,-83.00528 +/-100m); p62 (tier 3, 42.38069,-83.04132 +/-540m); p63 (tier 2, 42.38057,-83.03734 +/-100m); p64 (tier 2, 42.38275,-83.03396 +/-155m); p65__2 (tier 1, 42.38545,-83.02756 +/-100m); p66__2 (tier 1, 42.38869,-83.02889 +/-100m); p67 (tier 2, 42.37773,-83.05394 +/-100m); p68 (tier 2, 42.38496,-83.04235 +/-100m); p69 (tier 2, 42.38548,-83.04073 +/-100m); p70__1 (tier 1, 42.38552,-83.03654 +/-259m); p73 (tier 2, 42.38578,-83.04866 +/-100m); p74 (tier 2, 42.38640,-83.04331 +/-100m); p78 (tier 1, 42.38938,-83.04602 +/-263m); p80 (tier 2, 42.39011,-83.04939 +/-100m); p81b__2 (tier 1, 42.39023,-83.04159 +/-100m); p81e__2 (tier 1, 42.38802,-83.03114 +/-139m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p10","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0010/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0010","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"240.4,1379.8 233.7,876.0 238.9,239.9 1413.0,240.0 1411.0,692.0 1471.3,691.9 1185.4,819.8 1113.3,965.2 1259.6,1268.4 1240.9,1572.0 1290.9,1720.4 910.4,1457.7 755.5,1520.9 600.3,1485.1 353.2,1618.0 227.1,1578.5 240.4,1379.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0010/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[823.0,240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.022416,42.369783]}},{"type":"Feature","properties":{"resourceCoords":[1413.0,240.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.021108,42.370262]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p11","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0011","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"476.7,33.0 900.5,37.4 1568.8,41.5 1598.0,41.7 1601.0,669.9 1603.5,669.9 1593.5,1295.2 1595.6,1295.2 1586.1,1920.7 1552.2,1920.5 23.5,1909.8 28.1,725.3 32.0,725.0 32.0,677.0 28.3,676.6 28.4,663.0 30.0,663.0 31.0,619.0 28.6,619.0 28.9,540.2 97.1,209.5 55.0,115.4 55.7,31.8 476.7,33.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[890.0,669.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03612952475437,42.366082673985915]}},{"type":"Feature","properties":{"resourceCoords":[890.0,1898.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03474408847362,42.36403779265539]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p12","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0012","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"540.0,18.0 633.0,16.0 633.0,15.0 637.9,14.8 638.0,17.0 693.0,19.0 846.4,15.1 1078.0,19.0 1375.0,19.0 1590.1,25.4 1583.0,265.0 1586.2,676.2 1584.3,850.0 1558.0,850.0 1556.0,898.0 1583.8,898.5 1579.6,1292.5 1579.2,1511.7 1578.2,1930.4 604.1,1929.0 604.0,1926.0 542.8,1928.9 491.6,1928.8 184.9,1928.0 147.0,1926.0 31.8,1927.7 37.9,1291.3 35.7,1291.3 42.4,654.4 39.9,654.4 33.3,25.4 46.0,27.0 130.0,28.0 355.7,14.6 458.6,14.6 459.0,16.0 479.0,16.0 479.2,14.6 502.4,14.6 540.0,18.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1017.0,1292.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.031663,42.366419]}},{"type":"Feature","properties":{"resourceCoords":[1583.0,265.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.031532,42.368559]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0013","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.2,1518.8 65.0,1300.4 69.8,686.2 65.4,276.5 72.0,28.2 555.5,29.0 626.0,33.0 941.0,28.1 1595.3,27.0 1588.8,662.3 1586.2,662.3 1596.1,1297.8 1581.6,1933.7 1388.1,1934.0 1377.5,1934.0 1377.0,1932.0 1301.0,1929.0 1299.9,1934.0 1288.7,1934.1 1288.0,1930.0 1257.0,1929.0 1256.5,1934.1 1046.2,1934.4 1046.0,1932.0 992.0,1932.0 991.9,1934.4 939.2,1934.5 939.0,1930.0 846.0,1926.0 378.0,1923.0 232.0,1933.0 65.6,1930.3 65.2,1518.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[765.0,1910.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02818971674881,42.36643386533817]}},{"type":"Feature","properties":{"resourceCoords":[440.0,69.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03092373961744,42.36920281459133]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p14","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0014","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"840.5,26.7 1546.2,28.6 1543.3,655.4 1542.8,923.9 1540.0,924.0 1537.0,951.0 1539.0,969.0 1542.8,969.0 1542.2,1294.5 1537.5,1926.2 953.8,1926.5 116.0,1924.0 51.7,1924.0 68.7,1290.8 61.2,657.9 63.8,657.9 72.7,28.6 200.0,28.0 213.8,26.5 274.6,25.6 840.5,26.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[958.0,1300.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02500971699179,42.36882305528917]}},{"type":"Feature","properties":{"resourceCoords":[958.0,672.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02570360558258,42.36985922465137]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p15","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0015","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"265.0,542.3 285.7,102.9 532.2,102.8 875.4,101.5 1465.0,102.0 1469.3,539.5 1463.5,1177.6 1459.4,1815.8 282.6,1820.1 281.6,1175.0 282.6,542.3 265.0,542.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[868.0,1818.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.022416,42.369783]}},{"type":"Feature","properties":{"resourceCoords":[1465.0,102.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02296,42.373072]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p16 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6436.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"23.4,1801.7 478.1,1793.8 480.0,1892.2 668.9,1783.7 779.9,1584.2 1009.8,1408.7 1509.9,1263.8 1608.0,741.2 1608.0,513.5 1556.5,517.4 1563.5,473.1 1608.0,301.3 1603.8,246.5 1599.0,246.0 1596.0,147.0 1598.5,81.4 1566.6,81.9 909.3,93.8 875.7,89.5 663.1,89.9 7.2,99.0 17.1,533.6 19.4,1167.7 23.4,1801.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[452.0,1175.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02081454717695,42.371638548555886]}},{"type":"Feature","properties":{"resourceCoords":[887.0,1175.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01983839733562,42.371981242740524]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p16 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4071.6"},{"label":"split_canvas_y","value":"5050.8"},{"label":"split_canvas_w","value":"2364.4"},{"label":"split_canvas_h","value":"2745.2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1218.1,1948.0 1280.1,1920.4 1528.2,1891.0 1579.7,1803.9 1502.2,1765.3 1595.5,1610.5 1608.0,1603.6 1608.0,1507.1 1162.2,1506.5 1159.2,1948.0 1206.7,1948.0 1218.1,1948.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0016__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1174.7,1859.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02068127038389,42.36968179925563]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,1511.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02015218579461,42.37060340639161]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p17","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0017","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"40.8,1030.9 101.0,1029.0 100.0,983.0 41.7,983.0 55.0,303.1 904.5,318.1 1564.7,328.8 1622.1,329.9 1603.0,803.1 1611.1,803.2 1613.0,1237.9 1609.2,1237.8 1603.0,1672.2 1556.3,1671.5 881.6,1660.4 453.7,1651.6 28.7,1646.1 40.8,1030.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[898.0,790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.037773,42.368583]}},{"type":"Feature","properties":{"resourceCoords":[1320.0,1233.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.036332,42.368212]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p18","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0018","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"485.5,1658.0 29.4,1659.2 27.5,1216.9 31.3,1216.9 21.1,774.5 12.9,774.5 23.3,292.4 482.0,293.0 1576.3,290.9 1582.4,771.6 1582.5,1042.3 1550.0,1044.0 1551.0,1088.0 1582.7,1086.3 1583.6,1656.1 1583.3,1665.8 1366.2,1660.0 1066.5,1660.8 832.6,1657.5 677.9,1661.9 622.2,1657.8 485.5,1658.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[482.0,1216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.034686,42.368811]}},{"type":"Feature","properties":{"resourceCoords":[482.0,293.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.035681,42.370311]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0019","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"63.8,774.5 63.6,289.8 274.8,292.2 1611.0,307.5 1601.2,791.8 1606.3,791.8 1586.9,1238.0 1600.1,1683.9 941.5,1677.0 619.7,1678.0 547.9,1673.0 54.0,1666.0 60.1,1091.7 38.0,1092.6 38.0,1081.0 35.4,1080.3 28.6,1048.6 60.5,1047.3 63.8,774.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[798.0,784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03114166363736,42.37098878662957]}},{"type":"Feature","properties":{"resourceCoords":[73.0,745.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03275671461414,42.37046425027822]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p1 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"17"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6536.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"161.4,108.0 93.9,458.6 94.9,1656.5 136.5,1720.3 179.2,1694.8 574.9,1696.1 577.8,1904.9 608.8,1904.0 797.4,1889.1 998.0,1534.4 1463.8,1278.0 1633.0,1323.6 1633.0,1247.1 1455.2,1247.3 1458.5,1127.6 1453.2,940.0 1458.1,109.5 587.1,110.0 161.4,108.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[139.0,1327.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.031794,42.355915]}},{"type":"Feature","properties":{"resourceCoords":[1456.0,518.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.029769,42.358303]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p1 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.66"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4068.8"},{"label":"split_canvas_y","value":"5563.6"},{"label":"split_canvas_w","value":"2467.2"},{"label":"split_canvas_h","value":"2232.4"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1184.0,1465.8 1153.0,1489.5 1153.8,1504.7 1056.5,1600.9 1041.9,1819.9 1090.4,1919.3 1115.2,1919.0 1115.2,1947.0 1255.4,1941.8 1256.1,1923.0 1320.1,1924.0 1322.1,1932.0 1323.1,1925.0 1359.1,1925.0 1361.1,1936.0 1363.1,1926.0 1404.1,1926.0 1492.4,1931.9 1600.5,1927.3 1612.2,1699.3 1581.4,1698.3 1589.9,1491.8 1196.7,1466.7 1184.0,1465.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1017.2,1390.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03178115175747,42.355304384348344]}},{"type":"Feature","properties":{"resourceCoords":[1634.0,1390.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0304548574025,42.35586686363717]}},{"type":"Feature","properties":{"resourceCoords":[1634.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.02977006357241,42.35497265284723]}},{"type":"Feature","properties":{"resourceCoords":[1017.2,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03109635792738,42.354410173558406]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p20","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0020","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.7,304.5 382.9,303.4 383.7,330.9 1368.2,323.9 1368.5,323.1 1486.9,317.4 1539.1,322.7 1545.4,782.0 1552.0,782.0 1550.7,1224.5 1552.8,1224.5 1534.2,1670.1 829.9,1674.0 250.9,1677.5 34.9,1678.8 14.3,1234.1 26.3,788.6 21.2,788.6 22.9,305.2 174.7,304.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1552.0,1670.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.025101,42.3714009]}},{"type":"Feature","properties":{"resourceCoords":[1552.0,782.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.026044,42.3728384]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p21","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0021","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"287.8,1263.7 290.1,806.7 347.2,807.4 344.6,212.5 911.1,241.9 911.8,210.5 1498.5,217.6 1498.2,233.7 1476.2,1719.3 881.7,1710.7 535.6,1707.3 285.6,1704.0 294.4,1263.8 287.8,1263.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[308.0,1259.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02601959731068,42.37285734488798]}},{"type":"Feature","properties":{"resourceCoords":[884.0,790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0252826304516,42.37408515046584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p22","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0022","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"21.9,248.9 253.5,246.5 468.8,247.7 894.6,240.6 1549.8,239.2 1607.8,239.2 1608.0,251.0 1617.0,252.0 1617.0,350.0 1608.0,351.0 1608.0,372.0 1617.0,373.0 1617.0,1165.0 1555.0,1166.0 1554.0,1213.0 1617.0,1213.0 1617.0,1711.9 1603.9,1712.0 941.8,1721.5 908.0,1717.0 693.9,1716.5 33.2,1723.1 21.9,248.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[475.0,1277.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0224538,42.3741533]}},{"type":"Feature","properties":{"resourceCoords":[908.0,1717.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0210212,42.3737719]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0023","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.1,1218.7 106.0,1217.0 105.0,1170.0 51.3,1167.8 54.9,55.3 1356.5,57.9 1601.5,57.5 1625.0,57.5 1625.0,98.0 1625.0,176.7 1623.2,246.4 1618.4,694.5 1622.2,694.5 1621.3,1336.2 1614.6,1336.2 1616.1,1894.7 1582.5,1894.6 911.9,1894.8 49.0,1893.8 51.1,1218.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[917.0,1336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0388915,42.3702756]}},{"type":"Feature","properties":{"resourceCoords":[917.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04028,42.372357]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p24","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0024","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3.9,703.9 9.8,1350.0 3.1,1350.1 10.6,1912.6 496.2,1909.1 1595.5,1897.7 1591.0,1278.9 1559.0,1280.0 1557.0,1267.0 1559.0,1235.0 1590.7,1233.9 1587.5,690.2 1582.0,45.5 480.1,56.4 2.9,62.2 1.0,62.3 1.0,703.9 3.9,703.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[490.0,699.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0369707101934,42.37227178239328]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,699.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03457197020822,42.373121718727205]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0025","type":"ImageService3","width":1626,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1591.6,52.0 1593.7,412.2 1590.7,412.2 1591.2,701.0 1603.3,701.0 1609.1,1345.2 1593.2,1345.1 1579.8,1909.7 250.2,1897.9 39.3,1896.0 46.0,1276.1 13.9,1276.6 14.8,1231.5 46.6,1231.0 53.2,686.4 59.5,40.4 1591.6,52.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[752.0,696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03303654694082,42.37368936346752]}},{"type":"Feature","properties":{"resourceCoords":[752.0,410.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.033348944189,42.374148929611756]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p26","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0026","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"34.1,1894.7 42.4,1337.3 58.0,1337.3 46.5,701.5 34.6,701.6 31.6,416.6 34.5,416.6 29.2,61.0 155.6,60.8 404.4,60.4 1556.2,61.0 1558.5,61.0 1592.2,1916.7 1484.0,1914.0 1367.0,1919.0 1366.8,1919.8 394.6,1921.8 393.9,1894.7 188.3,1894.7 34.1,1894.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0026/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0320448,42.375478]}},{"type":"Feature","properties":{"resourceCoords":[1618.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0284633,42.3767769]}},{"type":"Feature","properties":{"resourceCoords":[1618.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.02634540000001,42.373589800000005]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0299269,42.3722909]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0027","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"37.0,649.4 37.7,96.2 45.8,9.9 439.0,18.0 621.0,27.0 1429.0,17.0 1587.9,22.3 1594.8,28.5 1615.0,82.3 1608.2,656.0 1605.6,1154.7 1607.0,1277.7 1605.2,1896.0 1520.0,1895.1 881.5,1889.2 466.4,1891.5 256.6,1888.0 30.8,1887.8 33.2,1349.3 49.0,1349.0 50.0,1301.0 33.5,1300.7 33.6,1268.2 37.0,649.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[900.0,1267.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02328229886058,42.377245379170695]}},{"type":"Feature","properties":{"resourceCoords":[28.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0266297002635,42.37857012538747]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p28 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"21"},{"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":"6472.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1563.0 1.0,1570.7 51.6,1567.6 48.4,1794.2 50.4,1784.1 491.6,1651.0 634.4,1445.9 801.4,1378.0 924.4,1229.9 938.8,1227.2 938.8,1223.0 960.2,1223.0 1191.9,1178.2 1308.6,1093.8 1442.7,1109.7 1477.8,930.2 1479.8,833.6 1473.0,628.3 1472.0,201.0 539.6,203.8 38.4,202.6 33.6,574.4 1.0,574.8 1.0,622.6 33.1,623.0 28.9,1127.5 47.2,1127.5 43.6,1194.2 53.6,1351.5 5.8,1525.8 1.0,1563.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[540.0,1127.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01833,42.374748]}},{"type":"Feature","properties":{"resourceCoords":[1472.0,201.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.017289,42.376987]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p28 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3755.2"},{"label":"split_canvas_y","value":"4892.0"},{"label":"split_canvas_w","value":"2716.8"},{"label":"split_canvas_h","value":"2904.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1033.6,1908.3 1225.5,1846.1 1352.7,1906.4 1520.1,1845.4 1573.0,1412.4 1555.1,1413.0 1551.1,1366.0 1578.9,1364.3 1579.5,1359.9 1532.5,1342.5 1532.2,1299.3 1049.1,1282.8 1034.3,1705.2 1033.6,1908.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0028__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1036.7,1905.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01658711388126,42.375978685695536]}},{"type":"Feature","properties":{"resourceCoords":[1532.1,1497.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0159885299805,42.37706196984526]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p29","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0029","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"554.1,36.7 1486.7,27.3 1487.1,670.8 1496.5,1876.0 565.8,1885.6 65.5,1887.9 67.2,1324.5 86.6,1324.5 83.2,684.0 80.7,556.6 79.1,40.2 554.1,36.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[558.0,678.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.020628,42.378196]}},{"type":"Feature","properties":{"resourceCoords":[90.0,1888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02037,42.375862]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p2 [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":"0.0"},{"label":"split_canvas_w","value":"6404.0"},{"label":"split_canvas_h","value":"5936.8"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"226.9,1240.0 415.6,1238.8 416.1,1257.2 417.7,1319.0 492.1,1338.5 973.0,1251.4 1042.1,1177.8 898.0,1032.8 1031.8,759.3 1101.5,752.1 1182.0,452.4 1343.6,324.8 1343.3,294.3 1319.3,254.8 1314.5,98.3 972.7,99.7 454.8,97.7 224.0,98.0 223.3,931.7 229.7,1120.0 226.9,1240.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[224.0,508.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.029769,42.358303]}},{"type":"Feature","properties":{"resourceCoords":[224.0,98.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.030212,42.358972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p2 [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.87"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4766.4"},{"label":"split_canvas_y","value":"736.4"},{"label":"split_canvas_w","value":"1637.6"},{"label":"split_canvas_h","value":"3476.8"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1242.6,965.9 1581.7,1020.4 1558.7,293.8 1349.5,354.2 1221.5,676.4 1242.6,965.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1191.6,184.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04276002583643,42.421870067838526]}},{"type":"Feature","properties":{"resourceCoords":[1601.0,184.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04175005266899,42.421892152250415]}},{"type":"Feature","properties":{"resourceCoords":[1601.0,1053.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0416867524371,42.42030922041811]}},{"type":"Feature","properties":{"resourceCoords":[1191.6,1053.3],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04269672560454,42.42028713600622]}},{"type":"Feature","properties":{"resourceCoords":[1570.0,327.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.041816,42.42163]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__4/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p2 [4]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"1687.6"},{"label":"split_canvas_y","value":"5860.4"},{"label":"split_canvas_w","value":"4716.4"},{"label":"split_canvas_h","value":"1935.6"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__4/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1307.2,1588.3 513.0,1530.8 492.9,1544.3 472.0,1932.7 591.8,1931.0 592.8,1938.0 595.8,1931.0 613.8,1931.0 614.8,1939.0 905.5,1939.0 906.1,1944.1 911.0,1944.2 911.5,1939.0 939.5,1939.0 940.1,1944.2 947.9,1944.2 948.5,1939.0 1011.5,1939.0 1012.0,1944.3 1019.9,1944.3 1020.5,1939.0 1137.3,1939.0 1138.0,1944.5 1163.7,1944.6 1164.3,1939.0 1234.3,1939.0 1234.9,1944.7 1241.7,1944.7 1242.3,1939.0 1295.2,1939.0 1295.9,1944.8 1302.5,1944.8 1303.2,1938.0 1327.2,1939.0 1327.8,1944.9 1354.5,1944.9 1355.2,1938.0 1542.0,1937.0 1543.0,1913.0 1555.6,1913.0 1576.7,1516.6 1384.7,1494.8 1382.3,1561.4 1307.2,1588.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0002__4/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[421.9,1465.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03873737967949,42.4233995274737]}},{"type":"Feature","properties":{"resourceCoords":[1601.0,1465.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03583123378343,42.423476770778805]}},{"type":"Feature","properties":{"resourceCoords":[1601.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03578838803382,42.42259532170701]}},{"type":"Feature","properties":{"resourceCoords":[421.9,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03869453392988,42.4225180784019]}},{"type":"Feature","properties":{"resourceCoords":[1069.4,1538.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.037135,42.423309]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0003","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"30.7,1706.5 31.6,603.7 88.0,603.0 87.0,558.0 31.6,558.7 32.0,60.4 460.6,60.7 1563.8,66.0 1617.0,66.1 1615.9,452.3 1616.9,452.2 1611.0,915.0 1608.3,915.0 1606.3,1313.7 1600.4,1714.3 1539.2,1713.7 1311.9,1712.6 450.8,1712.3 30.0,1710.0 30.7,1706.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[883.0,914.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03205740732287,42.359939136050386]}},{"type":"Feature","properties":{"resourceCoords":[1274.0,59.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03213276037715,42.361672061098744]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0030__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p30 [1]","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6472.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0030__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0030","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"116.0,39.7 111.4,684.0 111.3,1890.7 600.3,1889.5 602.2,1933.2 651.7,1933.8 655.5,1889.1 1083.8,1883.5 1183.3,1715.6 1530.0,1469.5 1579.0,1303.1 1514.7,1304.7 1507.1,1195.2 1473.3,181.4 610.7,183.2 611.8,40.2 116.0,39.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0030__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[112.0,1325.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0178984,42.3779022]}},{"type":"Feature","properties":{"resourceCoords":[1500.0,982.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.015231,42.379564]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p31","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0031","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"90.5,1127.6 113.2,1058.4 105.0,538.0 92.5,95.1 565.8,70.8 565.9,77.9 1027.0,79.3 1027.0,82.1 1498.1,63.8 1505.2,517.2 1501.0,517.2 1504.1,1088.3 1512.5,1088.2 1525.6,1770.6 585.6,1786.7 106.9,1793.6 104.8,1194.5 82.9,1138.7 90.5,1127.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[577.0,1105.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.022047,42.380331]}},{"type":"Feature","properties":{"resourceCoords":[105.0,538.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0236703,42.3808854]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p32","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0032","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"626.2,1925.3 626.9,1783.6 135.6,1784.5 130.9,1112.6 122.6,1112.7 126.4,550.5 130.6,550.5 129.1,153.6 129.1,139.4 129.7,77.6 176.4,30.9 307.0,23.0 308.0,18.0 309.0,23.0 373.0,22.0 374.0,10.0 541.0,9.0 542.0,24.0 635.0,25.0 636.0,9.0 658.0,9.0 659.0,25.0 981.0,23.0 1166.0,31.0 1271.0,30.7 1428.0,437.8 1429.8,487.8 1435.9,660.5 1441.8,827.8 1451.1,1098.5 1455.1,1208.8 1480.8,1914.3 1474.0,1914.0 1440.0,1915.0 1439.0,1919.0 1415.0,1916.0 1410.0,1920.0 1410.1,1921.6 626.2,1925.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1453.0,454.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01780617853889,42.383211291295765]}},{"type":"Feature","properties":{"resourceCoords":[125.0,1098.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02004492867377,42.381096193658216]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p33","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0033","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1592.5,647.1 1596.0,1242.2 1635.0,1244.1 1635.0,1277.4 1635.0,1316.2 1602.3,1318.3 1584.6,1891.0 1544.3,1891.2 1305.5,1891.7 37.4,1889.8 38.4,1545.7 57.0,1546.0 58.0,1500.0 38.5,1499.7 42.3,46.0 1506.7,23.9 1586.8,110.5 1592.5,647.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[886.0,647.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0416451,42.3744425]}},{"type":"Feature","properties":{"resourceCoords":[26.0,647.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04359,42.3737354]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p34","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0034","type":"ImageService3","width":1618,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"291.4,26.8 305.0,26.0 305.1,25.7 1545.2,41.6 1545.2,29.8 1565.3,30.4 1565.5,175.2 1566.3,1558.6 1541.0,1559.0 1542.0,1599.0 1566.3,1599.4 1566.0,1903.9 474.0,1906.0 15.7,1908.0 32.6,1321.3 66.0,1319.0 65.9,1245.2 25.9,1243.4 21.0,633.7 14.0,84.1 291.4,26.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[474.0,1269.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.038359,42.374348]}},{"type":"Feature","properties":{"resourceCoords":[474.0,1906.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03767,42.373308]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p35","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0035","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1524.3,72.1 1551.8,72.0 1565.8,525.5 1567.5,525.5 1570.7,1150.7 1565.1,1150.8 1570.9,1812.1 36.5,1827.0 34.7,1519.2 10.1,1519.0 8.8,1478.5 34.4,1477.9 23.8,79.5 1524.3,72.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[750.0,533.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0350586,42.3768368]}},{"type":"Feature","properties":{"resourceCoords":[32.0,1167.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.035965,42.37525]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.74"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0036","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"181.3,1829.5 55.1,1828.3 58.5,1167.1 64.2,1167.2 69.8,542.2 68.1,542.1 60.5,88.4 241.9,91.0 411.4,93.5 449.9,133.8 1550.5,126.7 1567.8,1179.9 1591.3,1180.1 1593.0,1231.8 1580.1,1231.9 1593.3,1607.4 1579.0,1608.0 1579.0,1651.0 1594.9,1652.1 1601.8,1846.0 434.4,1832.0 181.3,1829.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0036/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03401266312868,42.378302204574275]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03049214408432,42.379616048865]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.02837653651768,42.37647869101979]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03189705556204,42.375164846729064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p39","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.53"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0039","type":"ImageService3","width":1636,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.6,1718.0 66.0,1718.0 67.0,1711.0 72.0,1710.0 72.0,1694.0 67.0,1693.0 67.0,1672.0 27.4,1670.8 20.8,164.3 99.0,54.3 1527.2,42.2 1589.3,110.6 1611.5,756.4 1635.0,877.1 1635.0,910.3 1635.0,970.9 1542.5,1003.7 1512.0,1580.8 1527.3,1579.0 1526.6,1837.7 48.0,1838.0 47.6,1718.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1124.0,1838.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03474,42.377865]}},{"type":"Feature","properties":{"resourceCoords":[48.0,1838.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03713,42.377006]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p4","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0004","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"11.8,459.1 6.9,65.8 453.3,59.2 1550.0,47.0 1553.5,441.0 1556.3,614.9 1552.0,615.0 1549.0,658.0 1557.0,658.0 1561.0,912.8 1563.9,1407.5 1576.7,1397.3 1566.5,1564.9 1451.0,1806.9 846.0,1897.7 846.6,1933.7 822.1,1894.3 815.8,1737.3 473.0,1742.0 15.8,1744.5 15.4,1336.5 11.3,930.5 14.0,930.5 11.8,459.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[473.0,1742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0285569,42.359567]}},{"type":"Feature","properties":{"resourceCoords":[3261.0,50.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0241795,42.3645076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.35"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0040","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"113.5,146.3 318.4,184.3 627.7,139.9 698.7,58.2 787.9,132.4 918.2,135.8 1102.4,41.3 1523.3,40.5 1589.5,235.1 1558.5,1076.9 1535.5,1077.4 1571.3,1857.8 481.0,1897.1 441.8,1858.2 273.8,1860.8 66.5,1864.0 62.0,1603.9 46.5,1606.0 65.5,1025.2 158.3,990.8 156.4,896.6 130.2,775.5 94.7,126.5 113.5,146.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03591326960812,42.381206709869616]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03234130571133,42.38244263635542]}},{"type":"Feature","properties":{"resourceCoords":[1613.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03033380612469,42.37923194041576]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03390577002148,42.37799601392995]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0041","type":"ImageService3","width":1628,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1521.3,1651.8 1479.2,1810.8 920.9,1801.0 781.4,1903.0 37.7,1885.0 51.6,1786.3 67.0,1787.0 68.0,1740.0 58.2,1739.6 100.8,1437.8 63.6,478.2 283.0,393.6 315.0,136.4 142.3,85.1 130.1,33.8 505.1,72.9 603.4,88.0 875.5,99.0 874.9,103.9 1132.4,101.0 1138.2,57.2 1142.2,25.1 1230.0,26.6 1232.0,308.4 1231.6,311.9 1218.6,418.8 1257.8,542.6 1587.8,576.5 1604.9,616.8 1586.8,790.0 1524.7,1385.0 1627.0,1522.6 1627.0,1665.0 1521.3,1651.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[829.0,484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03279583272152,42.385598503044754]}},{"type":"Feature","properties":{"resourceCoords":[476.0,484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03365998023936,42.3855190648609]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p43","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0043","type":"ImageService3","width":1628,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"277.8,1877.4 716.9,1870.3 818.6,1872.8 1440.2,1877.7 1441.9,1859.8 1445.0,1827.0 1440.2,1251.7 1445.0,353.0 1448.2,85.8 1427.0,119.0 1117.3,56.9 545.2,105.7 202.2,43.8 204.9,1.0 182.1,1.0 216.1,1826.0 239.4,1826.0 228.4,1877.4 228.4,1878.1 277.8,1877.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1445.0,353.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.028241,42.381051]}},{"type":"Feature","properties":{"resourceCoords":[1445.0,1827.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0266354,42.3786561]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p44","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0044","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"228.8,635.2 226.5,635.2 222.3,635.2 213.7,438.2 195.8,29.0 245.0,28.0 245.0,27.3 682.5,18.1 683.0,23.0 775.0,22.0 775.6,16.2 783.5,16.0 784.0,20.0 1403.6,20.8 1399.7,65.3 1402.0,634.0 1402.0,1270.0 1419.0,1303.6 1418.2,1353.0 1402.1,1353.4 1402.5,1890.8 819.2,1893.5 819.1,1924.7 255.6,1904.9 228.8,635.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1402.0,1270.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.025247,42.376526]}},{"type":"Feature","properties":{"resourceCoords":[1402.0,634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.025933,42.377566]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0045","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1166.7,359.9 1398.0,276.6 1399.8,189.2 1405.3,179.6 1620.0,184.2 1620.0,193.8 1534.0,192.0 1545.2,223.8 1612.6,199.2 1613.5,779.0 1614.9,848.8 1618.2,1702.8 1088.2,1704.6 883.3,1707.0 883.5,1725.1 462.9,1776.2 462.9,1765.9 46.6,1777.0 60.1,753.4 76.1,753.8 97.5,753.2 1163.0,360.7 1166.7,359.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[778.0,479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02838202175545,42.38445574786102]}},{"type":"Feature","properties":{"resourceCoords":[859.0,1718.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02684027801429,42.38244897238172]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0046","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1005.9,1930.3 1006.0,1927.0 921.0,1929.0 917.8,1932.2 913.0,1932.3 912.0,1931.0 864.5,1933.5 813.5,1934.6 538.0,1929.0 420.1,1932.2 289.3,1928.8 249.0,1926.0 171.3,1925.7 28.1,1922.0 17.4,1365.3 12.3,495.6 12.6,237.0 27.0,214.1 27.9,123.2 440.8,111.2 440.9,121.5 857.9,69.9 857.7,51.9 1060.9,49.1 1586.6,46.3 1589.3,476.1 1544.0,477.0 1542.0,498.0 1546.0,525.0 1589.2,524.4 1587.6,920.0 1597.6,1357.0 1602.8,1854.4 1580.8,1920.5 1508.0,1917.0 1407.9,1921.2 1005.9,1930.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1551.0,39.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02522716856134,42.383072438275846]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,1902.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02310859970909,42.37995197595447]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p47","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0047","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.3,86.4 133.8,38.5 1126.2,23.5 1295.0,27.0 1478.9,21.8 1620.0,161.4 1620.0,1781.7 1529.2,1871.6 1528.5,1934.5 1528.3,1898.6 1055.8,1908.8 1055.9,1906.0 593.8,1896.6 593.9,1889.4 119.1,1905.6 118.9,1891.3 125.5,1476.3 80.3,1476.5 78.8,1426.1 126.3,1425.8 128.9,974.9 134.3,86.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[598.0,1436.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0236259,42.382724]}},{"type":"Feature","properties":{"resourceCoords":[1060.0,1436.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0226252,42.383091]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0049","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"139.6,1789.5 139.6,1893.7 605.0,1872.0 605.0,1868.6 1060.9,1877.2 1060.9,1882.4 1516.0,1898.1 1521.4,1143.8 1512.5,31.6 1060.4,33.5 137.2,39.6 137.3,52.4 1.0,56.9 1.0,473.0 8.0,473.0 13.0,480.0 13.0,497.0 1.0,497.9 1.0,498.1 10.0,499.0 10.0,515.0 14.0,516.0 14.0,538.0 1.0,539.9 1.0,579.1 15.0,580.0 15.0,600.0 1.0,603.8 1.0,719.9 140.1,1123.3 140.1,1173.7 139.9,1516.6 139.6,1789.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[142.0,1140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01785569153994,42.383192772795695]}},{"type":"Feature","properties":{"resourceCoords":[1065.0,52.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01712174431393,42.385710460013996]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0005","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"33.4,663.0 85.0,663.0 87.0,630.0 85.0,619.0 33.5,619.7 35.0,153.8 1573.4,163.5 1612.9,163.8 1610.9,790.6 1608.8,790.6 1627.0,1373.7 1607.5,1373.5 1608.0,1760.1 1557.4,1759.9 457.2,1751.9 29.8,1750.5 33.4,663.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[890.0,786.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.034060880021,42.36295736869145]}},{"type":"Feature","properties":{"resourceCoords":[55.0,786.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03593007944997,42.362267106860116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p50","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0050","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"137.8,1925.0 134.0,1817.0 135.6,817.5 136.3,108.8 136.4,101.8 595.6,81.1 595.6,77.8 1045.3,87.2 1045.3,92.2 1494.3,108.6 1494.2,125.5 1564.9,126.0 1506.2,1015.0 1526.7,1003.9 1507.3,1270.5 1240.4,1704.6 1039.1,1596.4 932.9,1731.8 512.5,1890.9 201.1,1925.7 199.0,1925.0 137.8,1925.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[590.0,822.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0151573,42.3812235]}},{"type":"Feature","properties":{"resourceCoords":[134.0,1817.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0149852,42.3792249]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0051","type":"ImageService3","width":1621,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"138.5,1169.4 137.6,47.0 1055.2,52.6 1515.1,52.8 1503.3,1643.5 1509.8,1847.5 1502.6,1915.5 1351.0,1932.8 1339.0,1932.0 1102.0,1938.0 1099.0,1948.0 1002.4,1942.2 1002.0,1939.0 862.0,1933.0 851.5,1933.1 584.5,1917.0 584.7,1885.0 202.8,1905.3 199.8,1948.0 127.3,1948.0 138.5,1169.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[593.0,1167.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01391562085588,42.38475434597812]}},{"type":"Feature","properties":{"resourceCoords":[1027.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0142745240529,42.38686423958027]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p52","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0052","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"134.9,1811.8 128.1,1612.7 135.0,60.0 1014.0,60.0 1411.9,61.4 1469.2,71.0 1466.2,868.8 1554.8,870.4 1464.2,1110.2 1458.2,1399.9 1313.7,1589.7 845.5,1604.3 411.7,1880.3 151.9,1865.4 144.9,1903.8 124.0,1918.6 134.9,1811.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1014.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.011327,42.388059]}},{"type":"Feature","properties":{"resourceCoords":[135.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.013245,42.387293]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p53 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3878.4"},{"label":"split_canvas_w","value":"6464.0"},{"label":"split_canvas_h","value":"3917.6"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"233.1,1045.8 218.3,1096.6 241.3,1775.5 331.9,1789.8 334.5,1828.8 185.9,1836.6 290.5,1932.5 506.0,1921.0 673.0,1929.0 833.0,1924.0 1027.0,1933.0 1281.0,1924.0 1287.0,1926.0 1287.0,1936.0 1305.0,1936.0 1307.0,1948.0 1308.0,1926.0 1435.5,1931.3 1463.9,1909.3 1444.8,1728.2 1404.5,978.3 545.6,1031.8 539.9,978.0 527.9,1027.2 233.1,1045.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1443.0,1426.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02087731008271,42.387287355272]}},{"type":"Feature","properties":{"resourceCoords":[251.0,1018.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02392364141676,42.38707580367072]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p53 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.74"},{"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":"6464.0"},{"label":"split_canvas_h","value":"3928.8"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1283.6,931.4 1468.5,931.5 1615.0,929.8 1615.0,890.2 1524.7,869.8 1546.8,183.9 1565.0,133.7 1070.0,132.1 867.3,123.5 731.2,121.8 573.1,135.8 461.0,176.2 154.9,273.9 57.6,268.0 68.1,301.6 139.5,278.7 117.0,884.7 116.6,909.6 1114.8,923.0 1283.6,931.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0053__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02597,42.386221]}},{"type":"Feature","properties":{"resourceCoords":[1070.0,132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.024989,42.386607]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p54","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0054","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"119.4,935.2 1.0,1013.6 1.0,1929.0 52.2,1931.3 65.2,1931.8 136.2,1926.0 136.3,1913.5 1037.0,1916.0 1467.0,1918.3 1467.0,1917.0 1478.1,1917.0 1484.1,1338.7 1488.8,1338.5 1483.7,928.8 1487.3,928.8 1495.2,56.3 1571.5,57.3 1616.0,57.9 1616.0,52.6 246.6,31.9 227.0,33.0 131.7,32.6 114.5,758.5 119.4,935.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[122.0,454.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0209217,42.3872957]}},{"type":"Feature","properties":{"resourceCoords":[1037.0,1916.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.017153,42.385736]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p55","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0055","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"159.4,1334.0 164.1,1333.8 155.1,918.9 158.7,918.9 158.3,35.1 235.6,35.5 280.6,30.3 281.6,30.3 1508.4,37.2 1510.5,186.3 1507.0,915.2 1507.5,1917.0 1057.3,1920.1 158.9,1921.1 159.4,1334.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,1918.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01520528763194,42.38651603010026]}},{"type":"Feature","properties":{"resourceCoords":[1062.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01638690471525,42.38990464081804]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p56","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0056","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1356.2,36.0 1472.0,84.7 1471.0,125.4 1476.0,903.0 1499.2,902.8 1484.6,1915.2 1483.5,1915.2 1482.5,1915.2 1424.9,1905.9 1025.5,1907.4 143.3,1913.7 140.1,911.2 141.5,181.8 139.0,32.6 1356.2,36.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[138.0,55.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01541280497419,42.39028441252956]}},{"type":"Feature","properties":{"resourceCoords":[1484.0,1915.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01031752280541,42.38843953665211]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p57 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3410.0"},{"label":"split_canvas_w","value":"6464.0"},{"label":"split_canvas_h","value":"4386.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1273.4,1013.1 1169.7,952.7 684.2,963.3 414.7,1035.8 379.0,1021.1 378.2,1062.8 387.1,1860.7 613.1,1858.3 983.4,1852.0 1061.1,1831.9 1404.8,1655.6 1560.5,1575.5 1269.6,1012.4 1273.4,1013.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[388.0,960.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.01251583931997,42.3914823706731]}},{"type":"Feature","properties":{"resourceCoords":[1242.0,960.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0106959518951,42.39218883021997]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p57 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"8"},{"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":"6464.0"},{"label":"split_canvas_h","value":"5158.8"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1275.8,32.4 1008.4,75.5 1006.7,86.8 448.0,131.1 443.4,96.6 35.2,176.1 76.9,789.2 82.0,788.8 86.0,814.8 85.0,832.8 79.9,833.2 105.7,1212.2 126.6,1196.9 124.0,1152.9 471.1,945.4 471.7,944.9 544.0,880.8 573.3,870.7 598.5,852.3 626.3,852.5 1095.7,571.8 1195.5,539.2 1364.4,602.6 1337.6,487.4 1445.2,317.6 1458.6,20.0 1454.9,20.2 1438.0,36.0 1437.5,21.0 1275.8,32.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0057__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1438.0,36.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.011076,42.384288]}},{"type":"Feature","properties":{"resourceCoords":[544.0,880.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.012278,42.38247]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0058","type":"ImageService3","width":1617,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"193.6,1126.7 195.8,1126.8 203.1,111.2 400.8,108.5 762.5,101.5 838.3,81.6 938.4,30.0 1462.9,1029.7 1259.4,1511.9 977.5,1523.5 555.6,1754.7 467.0,1892.3 297.6,1912.5 291.2,1930.2 248.0,1929.0 202.0,1929.8 193.6,1126.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[626.0,1140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.00936112194975,42.3887808572148]}},{"type":"Feature","properties":{"resourceCoords":[187.0,1994.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.00934550555728,42.387033329862206]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p59","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0059","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1399.8,1794.7 96.5,1895.4 81.3,1907.6 92.5,785.1 355.9,789.4 526.0,792.0 534.6,176.1 537.5,178.5 565.4,223.6 965.2,379.8 1230.8,351.0 1392.8,260.1 1236.8,441.1 1073.5,630.7 1186.9,726.7 1265.9,793.6 1415.5,1765.2 1471.2,1757.0 1399.8,1794.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[526.0,792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.009328,42.391484]}},{"type":"Feature","properties":{"resourceCoords":[969.0,792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0087116,42.3921549]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p6","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"17"},{"label":"confidence","value":"1.00"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0006","type":"ImageService3","width":1601,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"479.1,137.6 1575.0,141.1 1572.2,675.7 1559.0,676.0 1560.0,722.0 1571.9,722.0 1566.2,1769.8 469.9,1766.0 20.9,1766.1 19.2,1371.4 39.1,1371.5 18.6,776.4 20.7,776.4 20.8,136.4 479.1,137.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[480.0,782.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0314272,42.363906]}},{"type":"Feature","properties":{"resourceCoords":[1006.0,140.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.030971,42.365371]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0060__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p60 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6436.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0060__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0060","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"539.4,1864.8 614.4,1794.5 1590.0,1758.1 1588.3,1702.2 1569.3,1653.3 1571.3,952.8 1538.0,954.0 1537.0,906.0 1571.5,905.3 1573.0,346.9 1522.0,43.4 1027.4,28.9 796.1,91.7 689.1,155.8 646.0,310.4 475.6,490.1 94.5,787.9 25.3,956.1 40.5,1460.0 102.5,1608.4 263.3,1783.0 403.6,1935.2 448.9,1936.3 462.7,1936.7 539.4,1864.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0060__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[706.0,1704.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.00798803095759,42.392672796711174]}},{"type":"Feature","properties":{"resourceCoords":[1553.0,-299.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.00380269245046,42.3952236623441]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p61","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.34"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0061","type":"ImageService3","width":1616,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"277.2,585.1 279.8,476.9 205.2,440.2 288.0,202.8 419.9,191.7 470.1,123.7 900.4,208.6 1062.2,136.4 1539.6,193.9 1612.4,920.7 1567.4,1732.9 62.0,1726.7 54.1,1090.8 277.2,585.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1297.0,922.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.052432,42.376539]}},{"type":"Feature","properties":{"resourceCoords":[1297.0,1746.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.051555,42.37522]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0065__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p65 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0065__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0065","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1388.2 1.0,1393.4 56.4,1553.8 13.1,1690.6 98.6,1729.8 133.8,1885.5 248.4,1921.8 248.5,1936.9 265.0,1937.0 287.1,1936.0 1373.4,1510.5 1377.1,1509.7 1612.0,1419.6 1612.0,961.5 1488.0,635.9 1572.2,603.9 1527.5,27.6 1463.0,23.0 1412.1,23.4 1382.1,89.6 984.4,33.7 980.1,42.9 932.8,41.1 888.2,20.9 723.0,24.0 669.0,21.0 667.1,1.0 661.0,1.0 665.0,3.0 664.0,21.0 645.0,21.0 637.4,1.0 128.8,1.0 46.4,267.4 45.0,270.6 1.0,367.1 1.0,500.6 306.6,633.2 310.8,677.1 240.7,837.9 1.0,1388.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0065__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1470.0,577.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02837895961936,42.386572518113596]}},{"type":"Feature","properties":{"resourceCoords":[586.0,1791.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02910514534928,42.383910069368355]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0066__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p66 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6508.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0066__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0066","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"442.0,26.0 387.2,71.5 360.4,59.5 329.2,129.2 36.2,420.7 98.7,1217.6 13.8,1250.0 139.1,1578.2 140.4,1948.0 141.0,1948.0 146.0,1939.0 402.0,1939.0 673.0,1834.3 781.4,1787.7 937.0,1764.5 1071.7,1758.2 1105.7,1678.1 1304.5,1257.1 1376.5,1092.0 1390.8,927.5 1408.0,935.4 1489.8,893.2 1464.5,880.8 1560.2,527.5 1533.7,43.9 1543.2,22.0 1515.8,22.3 1493.0,126.3 976.3,224.2 631.3,72.9 529.6,28.4 442.0,26.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0066__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1125.0,771.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02630996633467,42.388100577235335]}},{"type":"Feature","properties":{"resourceCoords":[402.0,1098.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02757533829377,42.38702714596052]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p7","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0007","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1601.3,155.4 1594.4,796.7 1599.9,796.7 1616.8,1388.8 1628.5,1388.8 1632.2,1732.0 1609.8,1721.0 1583.7,1816.8 46.7,1798.2 46.7,1783.2 48.6,723.0 86.0,723.0 87.0,678.0 48.7,676.7 49.6,156.1 49.6,150.3 217.9,153.2 365.6,143.3 838.9,146.8 933.2,155.5 1387.1,155.5 1601.3,155.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[754.0,163.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02816117054964,42.36637872306589]}},{"type":"Feature","properties":{"resourceCoords":[61.0,1390.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.02835999028783,42.36382827166976]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0070__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p70 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.65"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"3787.2"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2720.8"},{"label":"split_canvas_h","value":"2928.4"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0070__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0070","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1594.7,253.1 1125.4,23.7 1057.7,24.2 968.2,287.2 1007.2,390.6 1441.2,639.0 1597.4,661.1 1610.4,260.6 1594.7,253.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0070__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[946.8,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03781491122523,42.38609966041421]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03633275314263,42.38666652652015]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,732.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03551359074952,42.38548148668528]}},{"type":"Feature","properties":{"resourceCoords":[946.8,732.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03699574883211,42.38491462057934]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p71","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0071","type":"ImageService3","width":1613,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.9,1247.1 208.0,685.8 221.7,476.8 285.4,278.4 609.9,385.0 921.1,28.5 1529.0,16.8 1552.3,18.0 1572.2,394.0 1575.6,394.0 1562.3,773.0 1580.5,772.7 1548.2,1900.1 1550.1,1910.1 836.2,1922.6 832.8,1922.6 827.0,1920.0 715.0,1923.0 706.8,1923.8 538.2,1925.3 534.0,1925.0 524.8,1925.4 454.6,1926.0 446.0,1924.0 406.0,1926.5 372.8,1926.8 373.1,1928.5 327.2,1931.3 231.4,1932.5 219.7,1919.7 22.4,1294.6 74.0,1291.0 75.0,1248.0 19.9,1247.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[314.0,278.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03917653584708,42.389189007074506]}},{"type":"Feature","properties":{"resourceCoords":[1548.0,1908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03612527793307,42.3862337998221]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p72","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0072","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"977.5,25.5 999.5,56.6 1370.5,88.2 1370.5,23.1 1400.0,26.0 1422.3,22.0 1468.8,21.0 1599.9,1305.0 1551.0,1305.0 1550.0,1350.0 1604.7,1352.0 1606.4,1368.7 1604.0,1369.0 1604.0,1414.0 1611.0,1414.3 1613.1,1434.8 1614.0,1478.0 1617.5,1478.0 1618.2,1484.8 1616.0,1485.0 1613.0,1525.0 1622.4,1525.7 1626.0,1561.0 1626.0,1713.0 1612.0,1714.0 1612.0,1731.0 1615.0,1735.0 1626.0,1735.0 1626.0,1867.6 1371.3,1902.6 1371.3,1897.7 1099.6,1920.7 1000.0,1918.0 906.4,1920.0 905.0,1920.0 811.1,1922.0 804.0,1921.0 779.7,1922.7 668.3,1925.1 621.9,1924.5 618.8,1916.2 33.2,1924.5 40.7,1940.3 23.4,1940.8 21.4,1930.8 48.2,804.3 30.0,804.7 41.5,426.0 38.0,426.0 16.3,50.5 16.2,48.8 977.5,25.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1000.0,416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.033709,42.389002]}},{"type":"Feature","properties":{"resourceCoords":[1000.0,1918.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.033714,42.386269]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.60"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0075","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"126.2,143.8 575.5,204.5 576.2,15.0 587.6,15.0 898.9,173.4 1328.7,175.6 1607.5,531.0 1608.0,689.1 1608.0,979.8 1137.5,1435.6 1093.7,1478.0 941.4,1625.4 970.9,1735.1 45.4,1435.7 151.1,1310.4 41.2,1134.2 48.3,195.2 127.8,96.7 126.2,143.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0075/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0458641002735,42.3900657263349]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04239730443425,42.39143504725358]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0401672754409,42.38831159702475]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04363407128015,42.386942276106076]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.63"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0076","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1539.0,1902.7 1208.3,1914.7 245.9,1907.1 50.6,1778.5 135.5,1315.5 45.1,1006.6 107.7,929.7 121.9,423.8 39.4,218.0 71.0,68.1 101.4,29.6 1035.8,297.9 1002.7,189.3 1150.0,37.1 1219.6,30.9 1385.3,384.2 1306.4,465.9 1626.0,892.3 1626.0,910.5 1626.0,918.5 1567.2,978.4 1616.8,1003.5 1597.2,1041.8 1548.8,1022.3 1454.7,1672.3 1459.8,1689.0 1589.4,1749.8 1539.0,1902.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0443776860067,42.387770935208344]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04081023996686,42.38906883250701]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03871999147313,42.385890140904685]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04228743751297,42.38459224360602]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0077","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"118.8,229.3 1608.0,204.6 1569.5,238.3 1517.4,837.5 1577.0,969.4 1530.9,1656.3 1186.5,1751.1 790.4,1582.8 581.4,1594.5 502.8,1732.0 418.6,1731.3 180.8,1567.7 76.3,1573.6 96.3,772.0 41.7,448.1 141.0,253.6 118.7,235.1 118.8,229.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0077/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[888.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04958988786753,42.387468230560515]}},{"type":"Feature","properties":{"resourceCoords":[1333.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04862880446889,42.38783048263098]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p79","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0079","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"32.2,1618.2 40.3,105.4 197.7,24.7 1552.2,34.9 1541.8,838.1 1607.8,1112.4 1586.7,1835.4 1564.5,1855.1 79.3,1895.3 79.2,1901.0 47.7,1875.8 44.4,1820.5 45.0,1807.0 43.5,1806.8 32.2,1618.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0079/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.05385927544165,42.39042525421544]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.05035765604295,42.3917107526709]}},{"type":"Feature","properties":{"resourceCoords":[1609.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04826411513639,42.38855596134831]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0517657345351,42.38727046289284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p8","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0008/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0008","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"97.3,1387.8 85.6,1387.8 68.5,798.0 63.0,798.0 69.3,159.2 50.9,159.2 116.0,158.9 963.5,158.3 1554.0,156.0 1562.9,662.1 1550.3,861.7 1541.0,858.8 1387.2,1121.9 1301.0,1129.2 1183.2,1319.0 1054.2,1363.2 941.2,1324.2 797.6,1617.1 198.7,1777.5 101.2,1729.7 97.3,1387.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[960.0,798.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.023641,42.366738]}},{"type":"Feature","properties":{"resourceCoords":[1554.0,156.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0230235,42.3682629]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081","type":"ImageService3","width":1609,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1769.8 1.0,1818.9 454.7,1861.4 448.5,1669.8 460.1,1669.3 779.1,1816.5 1212.0,1800.7 1193.0,1778.2 1380.0,1641.3 1362.4,1633.3 1499.8,1245.5 1475.8,1234.7 1498.0,996.5 1502.5,998.6 1551.9,323.2 1470.9,262.0 1082.0,149.6 928.8,33.8 217.9,33.7 47.6,143.9 30.8,386.7 41.1,1556.7 61.0,1557.0 66.0,1566.0 64.0,1600.0 41.5,1600.0 42.5,1714.0 1.0,1769.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[474.0,768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04550023438051,42.392006150984216]}},{"type":"Feature","properties":{"resourceCoords":[474.0,1651.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04456964179829,42.3905821758794]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081a/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81a","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081a/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081a","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1269.2,1884.7 1262.7,1824.2 1480.6,1739.1 1478.4,597.4 1413.8,455.4 1419.1,151.6 1353.2,83.7 1.0,65.3 1.0,88.1 191.2,91.8 220.6,494.9 248.6,495.4 232.9,1041.9 221.3,1041.8 284.2,1480.8 282.2,1480.8 279.7,1869.0 1165.0,1855.4 1269.2,1884.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081a/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04081612416996,42.39401711558209]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03683541932105,42.39406946767263]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.03675109917434,42.390522875711184]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.04073180402325,42.39047052362064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081b__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81b [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6388.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081b__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081b","type":"ImageService3","width":1597,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,416.8 1.0,759.4 67.9,832.6 30.3,1505.2 445.4,1693.2 438.9,1811.3 979.0,1932.3 996.8,1933.0 1029.7,1423.5 987.7,1209.1 999.0,992.0 1354.7,1012.8 1573.5,570.1 1551.2,576.5 1545.9,249.8 1453.8,18.9 1341.4,18.6 461.0,280.0 41.0,405.0 1.0,416.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081b__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[999.0,992.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.039247,42.389188]}},{"type":"Feature","properties":{"resourceCoords":[41.0,405.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.041084,42.390599]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081c/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81c","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081c/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081c","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1093.0,1863.2 804.7,1867.2 372.1,1665.1 482.7,1465.3 463.7,1465.4 426.4,1061.6 400.4,1061.8 321.8,839.5 326.8,839.5 91.8,214.7 216.0,241.8 350.0,221.8 552.9,76.7 776.2,43.3 1234.0,49.2 1234.0,72.0 1424.1,75.6 1453.6,479.4 1481.5,479.9 1466.2,1027.4 1454.6,1027.3 1517.5,1467.1 1515.5,1467.0 1513.2,1856.0 1093.0,1863.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081c/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[594.0,77.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0423860177937,42.393828066449935]}},{"type":"Feature","properties":{"resourceCoords":[1525.0,1835.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04002285021512,42.39066359172091]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081d/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81d","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081d/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081d","type":"ImageService3","width":1597,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"428.4,459.6 428.0,525.4 52.8,491.1 30.6,459.4 40.1,459.3 64.2,129.2 139.6,69.5 829.9,50.4 1564.7,128.9 1580.8,89.2 1579.0,287.7 1563.5,1931.0 1559.0,1932.8 1379.0,1937.0 1199.0,1932.0 1105.0,1938.0 939.0,1931.0 669.0,1929.4 527.9,458.0 428.4,459.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081d/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,87.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0336838688591,42.39038248072119]}},{"type":"Feature","properties":{"resourceCoords":[809.0,87.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.03187294992398,42.39038891464808]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081e__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p81e [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"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":"6508.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081e__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081e","type":"ImageService3","width":1627,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"27.7,1929.1 409.0,1818.7 409.3,1746.8 455.0,1725.9 515.0,1703.9 413.6,1517.5 559.0,1139.4 559.0,1064.5 587.8,1064.5 618.6,1001.8 698.0,968.8 806.9,968.0 1176.1,965.2 1599.3,670.7 1578.1,568.5 1602.5,557.2 1598.8,189.8 1526.2,71.2 287.6,74.8 66.2,95.0 52.0,129.5 49.4,324.5 27.7,1929.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0081e__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[412.0,971.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.029084,42.388858]}},{"type":"Feature","properties":{"resourceCoords":[1484.0,100.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.026448,42.390469]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p9 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.45"},{"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":"6536.0"},{"label":"split_canvas_h","value":"7796.0"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.6,517.4 57.0,740.2 93.0,741.0 95.0,775.0 93.0,789.0 58.4,789.0 63.9,984.3 72.9,1474.0 85.5,1463.8 91.7,1335.7 387.2,1245.9 563.8,1060.0 980.5,815.4 1123.4,613.9 1540.2,263.8 1572.6,133.4 42.5,142.3 50.6,517.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__1/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0281927466251,42.36335605946174]}},{"type":"Feature","properties":{"resourceCoords":[1634.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.02454648180951,42.364619864104284]}},{"type":"Feature","properties":{"resourceCoords":[1634.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0225206424763,42.36138360915239]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1949.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.02616690729188,42.36011980450985]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1949 | sanborn03985_048 p9 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"2451.2"},{"label":"split_canvas_y","value":"3771.2"},{"label":"split_canvas_w","value":"4084.8"},{"label":"split_canvas_h","value":"4024.8"}],"created":"2026-10-18T10:29:40Z","modified":"2026-10-18T10:29:40Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009","type":"ImageService3","width":1634,"height":1949},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"662.5,1817.0 860.6,1806.1 1342.8,1760.7 1633.0,1733.3 1633.0,1608.2 1616.6,1490.0 1593.9,1544.9 1539.0,1522.2 1578.5,1096.4 1528.2,1043.4 1282.5,1054.3 1064.0,957.2 1025.2,958.2 964.0,992.7 946.7,985.5 938.7,1148.4 873.7,1314.0 693.0,1736.8 662.5,1817.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985194907:03985_07_1949-0009__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[860.6,1806.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.024989,42.386607]}},{"type":"Feature","properties":{"resourceCoords":[1538.1,1232.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.023989,42.38804]}}]}}]}