{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03985_026.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Detroit, Michigan | 1921 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"112"},{"label":"placed","value":"97"},{"label":"unplaced","value":"15"},{"label":"fit sources","value":"georef 49, georef-snap 43, snap:0 3, georef-street 2"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"3 sheet(s) cut into 6 panels"},{"label":"unplaced pages","value":"p10 (tier 1, 42.32960,-83.05126 +/-257m); p18 (tier 1, 42.32453,-83.05578 +/-126m); p42__1 (tier 1, 42.33123,-83.04996 +/-100m); p42__2 (tier 1, 42.32838,-83.07877 +/-514m); p58 (tier 1, 42.32373,-83.07894 +/-255m); p59 (tier 1, 42.31945,-83.08427 +/-142m); p60 (tier 1, 42.32143,-83.07714 +/-252m); p62 (tier 2, 42.31820,-83.07787 +/-116m); p73__2 (tier 1, 42.33117,-83.09831 +/-100m); p74 (tier 1, 42.33016,-83.09828 +/-259m); p8 (tier 1, 42.32803,-83.04639 +/-257m); p84 (tier 2, 42.30884,-83.08640 +/-204m); p85 (tier 1, 42.31243,-83.08568 +/-255m); p9 (tier 1, 42.32783,-83.05290 +/-253m); p90 (tier 1, 42.32769,-83.10396 +/-508m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p1","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0001/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0001","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"389.2,366.1 387.2,127.5 379.9,20.9 865.7,292.4 914.2,300.6 836.8,443.4 812.1,541.1 802.2,631.0 804.2,763.8 826.4,829.5 820.8,1014.5 1314.5,1012.5 1308.0,1560.0 816.7,1559.5 397.0,1560.0 397.8,1058.0 390.8,486.5 389.2,366.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1308.0,1560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0487506,42.3301201]}},{"type":"Feature","properties":{"resourceCoords":[397.0,1560.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0507199,42.3292721]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0100/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p100","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0100/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0100","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"100.2,1883.8 418.3,1773.4 418.4,1810.8 952.5,1807.8 952.5,1811.5 1569.0,1808.7 1569.7,1926.0 1595.5,1926.0 1607.0,1905.7 1607.0,1891.0 1627.0,1869.6 1627.0,260.5 1611.9,260.6 1591.2,1.0 1563.4,1.0 1563.4,47.5 152.7,59.1 135.8,59.2 141.9,904.7 160.9,904.0 100.2,1883.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0100/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[956.0,877.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09446,42.31596]}},{"type":"Feature","properties":{"resourceCoords":[956.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09542,42.3173]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0101/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p101","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.25"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0101/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0101","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"94.8,1717.9 56.7,523.0 115.3,117.6 155.6,117.6 157.1,72.3 716.4,78.1 716.3,78.6 1271.3,62.6 1271.5,55.8 1497.3,102.7 1440.5,696.5 1479.9,697.8 1457.2,1159.9 1449.2,1159.3 1498.5,1807.8 1494.1,1808.0 735.5,1807.5 100.8,1816.6 43.3,1816.1 94.8,1717.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0101/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1195.0,1808.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0937854,42.3107351]}},{"type":"Feature","properties":{"resourceCoords":[658.0,1808.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.094896,42.310264]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0102/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p102","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0102/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0102","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"166.4,1815.0 100.7,1196.0 108.4,1196.3 116.9,753.6 79.1,753.5 115.6,197.5 433.8,88.5 433.7,125.8 967.4,124.8 967.3,128.5 1583.2,128.1 1583.4,245.2 1609.2,245.3 1583.5,290.5 1585.8,761.4 1578.2,1136.9 1579.0,1755.6 496.1,1796.0 279.1,1808.5 166.4,1815.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0102/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[971.0,1787.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09142295073288,42.31174590036981]}},{"type":"Feature","properties":{"resourceCoords":[1581.0,1787.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09008272076633,42.31227569275476]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0103/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p103","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0103/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0103","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"158.0,146.9 767.8,121.8 1497.0,102.6 1494.3,707.9 1488.5,1674.5 1487.7,1691.0 1196.9,1686.9 1196.2,1699.6 685.3,1710.5 686.1,1684.1 150.0,1741.5 150.3,1616.0 115.4,1729.8 59.0,1198.1 111.8,650.0 58.0,470.6 65.4,224.0 102.7,147.9 158.0,146.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0103/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[155.0,949.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09510165756961,42.30846434150959]}},{"type":"Feature","properties":{"resourceCoords":[1492.0,124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0931524798265,42.31095871279618]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0104/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p104","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0104/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0104","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.9,105.5 461.5,93.2 1547.6,53.6 1564.5,53.0 1546.5,1926.0 1536.7,1926.0 1521.5,1926.0 1521.4,1741.0 922.8,1721.1 922.5,1695.5 120.6,1765.6 120.7,1700.7 121.6,1681.4 125.3,716.5 126.6,112.2 243.9,105.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0104/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[934.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09143547270686,42.31174838089087]}},{"type":"Feature","properties":{"resourceCoords":[1532.0,81.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0901260372509,42.31226703915552]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0105/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p105","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0105/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0105","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1472.3,71.3 1490.5,1705.4 1491.0,1756.0 1203.6,1862.3 1202.7,1763.2 689.3,1687.7 689.5,1702.0 157.0,1799.1 156.0,1684.0 154.3,1504.8 60.7,1884.1 107.7,571.4 59.4,521.5 89.2,314.0 108.8,299.8 108.5,196.6 141.4,12.7 142.8,137.6 675.2,72.9 674.7,99.1 1182.7,81.1 1183.2,68.5 1472.4,68.5 1472.3,71.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0105/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[147.0,703.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.093521,42.306259]}},{"type":"Feature","properties":{"resourceCoords":[1491.0,1756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0893366,42.3056805]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0106/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p106","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0106/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0106","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1563.8,342.1 1564.2,306.9 1595.5,307.0 1568.8,356.3 1525.0,1331.7 1473.8,1331.5 1420.2,1359.8 926.0,1533.9 851.2,1562.3 117.0,1814.3 117.3,1763.1 125.9,173.7 935.2,106.6 935.4,132.4 1539.3,155.4 1538.6,342.0 1563.8,342.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0106/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[124.0,1803.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08933472689725,42.30570471206777]}},{"type":"Feature","properties":{"resourceCoords":[1536.0,1322.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08684173097345,42.30769908806292]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0107/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p107","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0107/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0107","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1605.5,1715.8 1550.2,1714.1 1523.0,234.4 1521.5,234.9 1222.3,337.2 1223.8,235.0 696.2,143.8 696.1,158.6 144.2,245.1 146.2,126.3 148.1,1.0 132.8,1.0 42.7,330.2 1.0,357.1 1.0,393.8 37.6,447.0 19.1,1558.0 72.8,1898.2 1495.6,1899.4 1598.2,1869.8 1568.7,1767.2 1605.5,1715.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0107/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[693.0,516.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0907603,42.304525]}},{"type":"Feature","properties":{"resourceCoords":[138.0,710.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0917073,42.303742]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0108/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p108","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.68"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0108/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0108","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1525.8,1.0 1473.1,1.0 1421.8,28.2 931.6,203.1 857.5,231.6 130.6,484.1 174.3,1926.0 229.1,1926.0 265.1,1874.3 1456.4,1787.1 1432.8,1690.9 1326.1,1625.2 1381.5,1304.2 1525.2,1005.4 1564.6,667.4 1522.0,93.2 1525.8,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0108/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09018657931817,42.3063514470509]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08663074645263,42.307762753102416]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08437166411227,42.30465042688598]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08792749697781,42.30323912083446]}},{"type":"Feature","properties":{"resourceCoords":[932.0,203.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0879139,42.3068309]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0109/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p109","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0109/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0109","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"369.3,1897.4 373.3,1889.1 1237.0,1907.2 1552.8,1852.3 1595.0,690.9 1524.9,161.6 1229.8,117.7 1138.0,24.9 405.3,28.2 365.1,1.0 334.8,1.0 164.2,291.4 206.8,292.4 113.2,897.9 75.8,897.4 1.0,1025.2 1.0,1637.5 175.0,1866.2 1.0,1863.3 1.0,1864.3 369.3,1897.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0109/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08200969468824,42.31272836877773]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08007931597552,42.31011413036533]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0842343250251,42.30841247986555]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08616470373781,42.31102671827795]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p11","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.66"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0011","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"961.9,1761.7 442.5,1764.9 161.2,1794.7 136.5,1848.0 67.5,1854.7 189.8,1730.9 139.2,1268.5 286.4,936.1 320.2,742.9 254.2,679.8 397.9,413.3 529.8,420.6 710.0,268.5 924.3,280.3 1102.0,76.2 1141.7,83.9 1467.2,86.1 1627.0,85.5 1627.0,122.9 1552.1,123.3 1514.8,138.3 1504.1,165.9 1526.2,193.8 1468.0,193.7 1474.8,1106.8 1478.7,1106.0 1481.2,1762.2 1467.0,1762.0 961.9,1761.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[464.0,1161.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0604534,42.3316399]}},{"type":"Feature","properties":{"resourceCoords":[1467.0,1762.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0605144,42.3295038]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p12","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0012","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"700.7,1802.9 463.6,1800.9 139.3,1794.7 99.9,1786.6 145.1,1735.9 184.2,1204.7 311.5,929.8 287.5,796.4 388.2,378.0 539.5,236.6 869.9,371.0 998.9,142.2 1106.4,135.2 1346.9,134.1 1461.1,133.1 1478.5,731.5 1467.5,731.6 1464.7,1809.4 700.7,1802.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[957.0,1260.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0551392,42.3307436]}},{"type":"Feature","properties":{"resourceCoords":[957.0,722.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.053988,42.3312434]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p13","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0013","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"497.2,1778.2 301.2,1778.7 294.1,695.6 305.1,695.4 282.1,94.2 289.3,94.0 868.3,83.7 1376.8,81.5 1376.8,272.6 1383.8,1777.3 1324.1,1773.6 1100.0,1775.3 822.2,1769.4 551.4,1776.8 497.2,1778.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[822.0,694.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0527138,42.3295929]}},{"type":"Feature","properties":{"resourceCoords":[298.0,1236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.054519,42.329929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p14","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0014/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0014","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"272.6,1813.2 272.5,1776.0 275.1,279.4 276.3,89.3 835.0,84.0 835.6,46.8 835.4,25.9 1618.4,598.8 1613.3,605.2 1398.0,522.1 1329.7,609.9 1363.0,1369.6 1337.1,1720.4 1257.9,1805.7 272.6,1813.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[835.0,1235.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0524776,42.3273268]}},{"type":"Feature","properties":{"resourceCoords":[835.0,84.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0500096,42.3283914]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p15","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.65"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0015","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"806.0,1774.0 333.7,1774.3 311.2,1774.1 306.2,1116.7 302.4,1117.4 292.2,202.4 350.5,202.3 328.2,174.5 338.9,146.8 376.1,131.7 451.2,131.0 452.1,93.5 529.5,92.9 1298.2,87.1 1307.5,863.4 1310.4,934.5 1312.0,1251.7 1320.0,1768.6 806.0,1774.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[806.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.059896,42.328696]}},{"type":"Feature","properties":{"resourceCoords":[297.0,1774.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0605144,42.3295038]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p16","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0016","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1369.7,152.3 1367.1,392.3 1370.9,641.4 1368.8,883.8 1371.8,995.2 1372.6,1379.1 1378.5,1755.9 1307.6,1762.0 887.2,1765.1 751.6,1774.0 303.4,1774.8 299.8,1262.8 300.9,948.5 298.6,878.2 296.0,109.3 490.2,109.1 544.0,107.8 812.5,101.0 1087.9,107.2 1310.1,106.0 1369.3,109.8 1369.7,152.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1372.0,1172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0566291,42.3267359]}},{"type":"Feature","properties":{"resourceCoords":[821.0,1770.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.058605,42.327064]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p17","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.27"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0017","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"468.6,1781.5 323.0,1780.9 277.9,1782.9 254.0,1784.0 252.2,1385.2 255.9,978.9 253.9,861.0 259.1,604.5 258.0,340.8 263.5,86.9 263.5,81.0 1302.9,80.0 1367.4,267.1 1520.8,358.0 1522.1,1512.2 1555.1,1531.8 468.6,1781.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[254.0,1166.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0566291,42.3267359]}},{"type":"Feature","properties":{"resourceCoords":[254.0,1784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0578804,42.326188]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p19","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0019","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"414.2,77.3 1030.9,268.9 1255.5,280.9 1295.7,227.3 1440.0,312.4 1405.0,596.1 1398.4,772.8 1392.2,1574.3 193.6,1569.6 200.0,1063.0 201.6,548.0 289.1,550.5 348.6,74.6 377.4,50.9 414.2,77.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0675106,42.3297171]}},{"type":"Feature","properties":{"resourceCoords":[1396.0,1063.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.064968,42.330824]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p2","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0002","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"496.2,311.3 613.5,89.4 842.5,134.3 881.6,80.2 976.9,91.8 981.1,263.8 1301.2,462.2 1241.3,597.9 1389.8,931.2 1354.1,911.9 1366.0,995.6 1404.1,1534.5 772.0,1559.0 772.0,1005.0 272.6,1012.9 276.1,825.7 252.8,759.5 249.2,625.2 258.1,534.1 281.9,434.9 358.6,289.6 496.2,311.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[772.0,1005.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.049426,42.3310011]}},{"type":"Feature","properties":{"resourceCoords":[772.0,1559.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0487506,42.3301201]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p20","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0020/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0020","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"341.9,351.0 504.9,339.9 1256.9,744.3 1302.8,831.5 1260.5,920.5 1356.9,1010.5 1298.7,1142.5 1338.8,1182.3 1345.6,1253.0 1400.1,1278.3 1430.3,1566.2 786.9,1574.2 201.6,1579.0 197.9,760.4 202.4,579.8 234.7,289.6 341.9,351.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[809.0,1581.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06306047555117,42.33055278687565]}},{"type":"Feature","properties":{"resourceCoords":[210.0,1581.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06431610147916,42.330021324399425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p21","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0021/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0021","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"34.7,947.4 359.2,684.2 227.2,684.0 207.6,173.0 224.0,173.0 1421.0,173.0 1420.3,684.2 1422.2,943.4 1419.0,1193.8 1413.3,1193.8 1428.2,1703.2 1169.7,1701.9 858.0,1700.3 222.2,1703.1 207.3,1703.2 217.8,1197.0 309.1,1197.2 57.9,947.7 34.7,947.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[224.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06689,42.328915]}},{"type":"Feature","properties":{"resourceCoords":[1421.0,173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.064336,42.330017]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p22","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0022","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1412.3,1702.3 268.9,1701.1 236.8,1700.9 222.5,1193.6 228.2,1193.6 231.5,944.2 229.8,686.1 231.0,177.0 800.9,177.6 1427.4,175.5 1425.2,693.0 1419.5,1196.3 1418.7,1232.8 1412.3,1702.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[828.0,689.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0624164,42.3297592]}},{"type":"Feature","properties":{"resourceCoords":[231.0,177.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.064336,42.330017]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p23","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0023","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"208.1,1668.2 205.3,1447.7 210.0,1173.0 204.6,911.1 203.7,657.0 195.5,657.0 194.1,142.8 208.8,142.7 843.0,139.0 1154.0,140.1 1384.9,141.0 1384.9,653.1 1391.6,653.1 1396.1,1169.9 1400.5,1169.9 1398.8,1727.9 627.6,1727.6 208.8,1729.5 208.1,1668.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[210.0,1173.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0637029,42.32487]}},{"type":"Feature","properties":{"resourceCoords":[843.0,139.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0636354,42.3270895]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p24","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0024","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"261.0,142.3 1404.0,143.0 1402.4,654.0 1400.9,1103.9 1409.1,1240.0 1410.2,1661.9 1415.9,1733.1 812.5,1733.7 645.6,1727.0 213.0,1726.0 215.7,1169.0 211.3,1169.0 207.8,653.2 201.1,653.2 202.0,142.0 261.0,142.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[213.0,1726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0604667,42.3250862]}},{"type":"Feature","properties":{"resourceCoords":[1404.0,143.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.059896,42.328696]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p25","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0025","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"11.9,1593.0 238.6,854.6 259.4,855.5 261.1,778.6 261.3,335.8 258.4,145.4 667.2,141.5 1420.0,138.2 1424.8,209.3 1422.8,905.4 1451.4,905.2 1327.4,1798.3 1279.8,1784.5 1194.1,1818.2 1032.0,1725.0 964.9,1827.3 693.1,1737.4 429.9,1776.8 401.2,1826.6 101.5,1828.5 67.2,1852.2 73.6,1920.2 15.3,1926.0 12.0,1926.0 5.9,1593.8 5.8,1592.8 11.9,1593.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[240.0,155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06304074764726,42.32395515782233]}},{"type":"Feature","properties":{"resourceCoords":[1431.0,155.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06042113130246,42.32506915844705]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p26","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.37"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0026","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"238.1,918.9 210.0,919.0 214.5,234.1 210.0,164.0 626.3,163.7 787.0,169.8 1367.6,167.4 1371.0,230.4 1371.7,363.3 1608.5,1352.7 1540.8,1469.3 1553.9,1869.6 1235.2,1897.4 833.6,1828.0 352.4,1867.9 112.8,1797.3 238.1,918.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[210.0,919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0594897,42.3238412]}},{"type":"Feature","properties":{"resourceCoords":[210.0,164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0604667,42.3250862]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0027","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"278.4,1740.0 274.6,882.0 285.0,276.8 278.0,49.2 875.4,277.9 1169.9,304.9 1407.0,493.9 1412.4,651.3 1415.8,1277.5 1413.2,1599.3 1415.1,1774.8 537.0,1774.9 277.2,1780.0 278.4,1740.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[808.0,1779.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07217723765261,42.32891505599799]}},{"type":"Feature","properties":{"resourceCoords":[285.0,57.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07500085057238,42.33143286958818]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p28","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0028","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"193.1,142.2 393.9,112.5 770.1,287.7 997.4,195.4 1196.6,246.8 1256.5,337.6 1458.0,422.6 1501.9,686.8 1534.6,704.2 1508.8,732.1 1512.7,1221.1 1424.0,1230.3 1491.8,1751.0 1334.0,1769.3 767.6,1764.4 153.9,1761.5 157.5,1410.8 155.9,1232.6 159.2,905.6 157.2,269.5 152.2,109.5 193.1,142.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[800.0,1246.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06952800407777,42.33006788110746]}},{"type":"Feature","properties":{"resourceCoords":[800.0,1756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06904787844272,42.32922744740393]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p29","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0029","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"663.0,1526.4 607.4,1516.0 551.8,1504.2 335.2,1479.7 284.0,1479.2 88.7,1458.4 164.8,856.4 237.1,301.1 238.0,144.1 748.6,144.6 748.8,161.2 1264.5,137.4 1263.5,4.2 1531.8,329.7 1524.4,1561.9 1376.8,1542.3 1378.1,1614.3 1365.4,1612.6 663.0,1526.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[168.0,846.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06908611121213,42.329195250199184]}},{"type":"Feature","properties":{"resourceCoords":[796.0,142.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06682680539619,42.328843051086444]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p3","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.77"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0003","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"669.5,980.0 648.5,979.9 611.0,979.0 611.0,416.0 1037.2,419.9 1031.8,714.0 995.4,982.1 992.8,1225.2 992.5,1249.9 943.3,1911.8 791.1,1821.1 159.8,1824.1 84.8,1763.5 669.5,980.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[611.0,979.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0500096,42.3283914]}},{"type":"Feature","properties":{"resourceCoords":[611.0,416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0507199,42.3292721]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p30","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0030/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0030","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"415.1,1617.0 1420.4,1757.2 1424.2,1686.4 1439.9,382.9 1442.9,131.1 929.3,126.7 425.1,111.2 426.1,20.3 175.0,268.1 145.3,1507.5 1.0,1485.7 1.0,1556.7 197.4,1585.9 415.1,1617.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0030/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.06593161642671,42.328067474955745]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0638621702149,42.32550548124894]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.06796316215278,42.3236941498557]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.07003260836458,42.3262561435625]}},{"type":"Feature","properties":{"resourceCoords":[1443.0,123.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0643591,42.325681]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p31","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0031","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"291.1,1703.6 295.0,1631.7 311.7,309.6 315.0,46.0 572.5,48.2 838.0,46.0 1116.3,54.2 1339.8,54.1 1389.1,54.1 1354.6,1781.0 1374.0,1783.7 1372.9,1864.1 874.4,1794.9 342.2,1711.6 291.1,1703.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[838.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0637029,42.32487]}},{"type":"Feature","properties":{"resourceCoords":[315.0,46.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0643591,42.325681]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p32","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0032","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"800.8,1898.9 800.9,1881.4 481.2,1852.3 224.7,1831.6 220.8,1752.7 201.7,1751.3 129.4,57.5 142.0,56.8 335.6,45.0 786.4,24.7 864.8,22.9 864.9,44.1 1627.0,240.6 1627.0,244.3 1627.0,246.8 1582.5,249.6 1512.2,369.9 1599.3,1239.5 1560.4,1714.2 1579.1,1789.8 1627.0,1818.2 1627.0,1889.0 800.8,1898.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0032/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0630489,42.3242683]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0611896,42.3216048]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0654535,42.3199776]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0673128,42.3226411]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p33","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0033","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"701.0,119.5 892.1,116.7 941.6,111.1 1153.7,109.4 1208.8,114.4 1214.6,238.1 1214.3,607.7 1209.7,723.8 1205.5,1503.2 1207.1,1742.6 1207.0,1791.0 1154.1,1791.5 969.6,1790.0 893.1,1773.8 397.5,1799.0 364.2,1785.0 366.0,1228.0 361.6,974.2 363.6,116.0 701.0,119.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[366.0,1228.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0733793,42.3285401]}},{"type":"Feature","properties":{"resourceCoords":[1207.0,1791.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0738603,42.326692]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p34","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0034","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.4,96.5 938.3,96.9 1149.4,98.6 1368.1,99.2 1413.8,99.2 1500.4,1818.2 187.4,1720.8 185.7,1494.7 189.2,708.0 193.9,590.9 193.9,217.9 188.0,93.0 243.4,96.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[187.0,1217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07255599135061,42.32709948464586]}},{"type":"Feature","properties":{"resourceCoords":[187.0,698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07136410592894,42.3274710370479]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p35","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0035","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1266.8,100.0 1426.5,1788.2 367.9,1798.0 270.1,107.5 1266.8,100.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[292.0,705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07016109008858,42.32535789713061]}},{"type":"Feature","properties":{"resourceCoords":[1453.0,1790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07156077649933,42.322608210799956]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p36","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0036","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"175.3,127.4 189.9,127.6 713.2,133.4 1202.1,130.5 1315.7,996.2 1422.1,1807.2 805.9,1806.4 331.1,1812.8 329.1,1666.5 315.2,1665.5 175.3,127.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[776.0,998.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06927180562386,42.32246445309356]}},{"type":"Feature","properties":{"resourceCoords":[867.0,1810.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07106898079817,42.32172691517898]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p37","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0037","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"389.5,628.8 456.3,118.7 1198.2,119.6 1537.2,120.4 1510.6,644.1 1482.8,643.0 1523.3,1839.2 1172.8,1882.3 506.4,1889.4 481.9,1926.0 316.9,1926.0 285.5,626.5 309.6,627.7 333.1,628.0 359.6,628.4 389.5,628.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[416.0,628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07155549751661,42.319263318632444]}},{"type":"Feature","properties":{"resourceCoords":[416.0,122.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07218134132665,42.32005694828813]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0038/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p38","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0038/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0038","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1378.4,1782.3 1270.6,1764.9 1228.8,1825.8 789.8,1785.7 554.0,1848.8 336.7,1771.3 298.4,1825.7 223.8,1836.8 153.8,655.6 181.3,656.0 194.6,137.8 687.7,126.5 1571.8,106.2 1544.2,362.8 1506.8,682.4 1489.2,681.8 1477.5,1510.0 1547.8,1512.8 1378.4,1782.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0038/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[635.0,655.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0682274568956,42.32064206836697]}},{"type":"Feature","properties":{"resourceCoords":[721.0,113.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.06868875935679,42.32159045711114]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p39","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.62"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0039","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"64.3,1666.2 648.1,219.4 789.3,158.5 1529.5,187.7 1576.8,1632.3 1627.0,1636.7 1627.0,1664.7 1361.6,1695.3 1028.7,1693.8 686.0,1692.2 181.6,1685.4 18.2,1674.4 64.3,1666.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[410.0,817.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.081932,42.331345]}},{"type":"Feature","properties":{"resourceCoords":[1569.0,176.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0793724,42.3298969]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p4","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0004/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0004","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"641.6,1486.6 583.9,1483.1 581.8,1302.8 579.6,1237.7 571.5,996.5 595.6,729.2 587.9,437.4 1082.7,420.8 1106.2,1469.1 641.6,1486.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1097.0,987.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04805411457545,42.32921710347547]}},{"type":"Feature","properties":{"resourceCoords":[1097.0,1468.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04748895334033,42.32843941465525]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__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 | 1921 | sanborn03985_026 p40 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6512.0"},{"label":"split_canvas_h","value":"7708.0"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"457.5,1874.7 846.5,1922.5 846.7,1926.0 860.8,1891.5 1435.2,1888.6 1436.0,1848.2 1427.3,983.6 1434.3,373.6 1425.9,144.3 1146.7,39.2 884.2,28.0 824.6,1015.1 432.3,1020.7 457.5,1874.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[353.0,1865.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07584105992791,42.32783470001731]}},{"type":"Feature","properties":{"resourceCoords":[353.0,-261.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.077820205753,42.331378064344854]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__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 | 1921 | sanborn03985_026 p40 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.52"},{"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":"3072.4"},{"label":"split_canvas_h","value":"3886.0"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"280.1,893.1 232.2,55.6 130.1,47.0 62.5,47.8 22.3,441.0 40.5,888.1 129.9,820.2 222.9,887.4 280.1,893.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0040__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.07703252882345,42.32923889776825]}},{"type":"Feature","properties":{"resourceCoords":[768.1,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.07526286747945,42.32974490413974]}},{"type":"Feature","properties":{"resourceCoords":[768.1,971.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.07440269148526,42.32807739231813]}},{"type":"Feature","properties":{"resourceCoords":[0.0,971.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.07617235282926,42.32757138594664]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0041","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"62.5,1834.7 1587.7,1836.1 1588.7,1650.5 1575.6,1011.2 1320.7,815.7 1242.1,678.2 1293.8,555.5 1050.8,541.5 535.0,260.2 183.3,6.4 83.6,1.0 65.0,1.0 64.5,415.5 62.5,1834.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1161.0,669.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07911930270318,42.32740261303797]}},{"type":"Feature","properties":{"resourceCoords":[78.0,-85.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0823020673048,42.32790366780335]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p43","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0043","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"190.8,1650.0 224.9,1650.6 1314.0,1643.6 1480.8,1640.9 1475.0,1198.0 1485.8,1197.9 1474.0,263.6 193.2,184.4 193.5,200.2 194.0,250.0 139.6,251.2 1.0,251.9 1.0,262.3 102.0,282.3 51.0,704.7 112.2,890.8 103.4,1427.1 75.2,1504.8 53.4,1521.2 27.0,1498.6 3.6,1651.2 190.8,1650.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1475.0,1198.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0748259,42.3239016]}},{"type":"Feature","properties":{"resourceCoords":[194.0,250.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0738603,42.326692]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p44","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0044","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"322.8,292.8 321.6,270.5 1373.4,266.0 1377.2,1204.0 1376.2,1638.3 338.8,1638.8 258.3,1637.9 257.0,1204.0 267.6,1204.0 265.1,288.6 322.8,292.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[257.0,1204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0748259,42.3239016]}},{"type":"Feature","properties":{"resourceCoords":[1376.0,1204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0737473,42.3219972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p45","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0045","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1520.5,197.1 1516.1,624.8 1434.6,624.0 1428.0,1272.8 1559.2,1274.2 1174.4,1865.3 152.2,1856.1 152.3,1766.9 153.1,1694.3 168.2,177.9 201.7,179.2 1275.2,194.5 1439.5,195.2 1520.5,197.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1511.0,184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07572753251584,42.32347803128928]}},{"type":"Feature","properties":{"resourceCoords":[1511.0,614.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07670668447423,42.32316566557014]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p46","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0046","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2.4,1870.8 1.0,1903.2 1.0,1926.0 1608.0,1926.0 1608.0,1890.0 1627.0,1889.0 1627.0,1813.6 1483.7,1813.6 1257.5,1813.6 1388.5,1600.5 1243.2,1275.3 1376.0,1275.3 1376.0,217.8 1376.0,198.0 331.5,198.0 331.5,626.0 249.9,626.0 250.0,1275.3 381.4,1275.3 2.4,1870.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1376.0,626.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0757251,42.321384]}},{"type":"Feature","properties":{"resourceCoords":[1376.0,198.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0747468,42.3216873]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p47","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0047","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1592.5,1529.8 1595.4,804.0 1591.4,804.0 1597.8,235.8 1589.6,235.8 536.1,235.8 536.2,103.5 212.3,248.2 1.0,118.5 1.0,1737.7 84.0,1726.9 790.0,1634.2 1079.5,1596.5 1401.7,1554.5 1592.5,1529.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1183.0,804.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0751784,42.32042]}},{"type":"Feature","properties":{"resourceCoords":[1183.0,1583.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0744289,42.3190983]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p48","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0048/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0048","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"774.2,1413.2 137.2,1502.0 116.0,1505.0 112.3,784.6 108.3,784.7 109.5,220.8 120.9,220.7 553.2,217.9 1486.8,205.9 1486.9,214.9 1627.0,201.1 1627.0,215.0 1480.2,218.1 1490.1,694.4 1493.8,1312.6 774.2,1413.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[552.0,782.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07321404786133,42.32102631877532]}},{"type":"Feature","properties":{"resourceCoords":[1496.0,782.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07102309845004,42.32168809864378]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p49","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0049/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0049","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"484.2,633.6 416.1,644.1 333.6,656.8 372.2,73.1 374.7,8.3 691.9,10.2 1389.5,13.6 1513.2,14.3 1501.2,474.9 1476.0,479.0 1428.8,1898.1 356.1,1898.5 226.0,1886.8 484.2,633.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[336.0,634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07678702249362,42.31672367306833]}},{"type":"Feature","properties":{"resourceCoords":[336.0,35.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07755923828996,42.317693001108154]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0005","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1154.0,583.4 1171.5,1144.6 1167.3,1639.8 517.0,1642.3 528.5,600.8 1154.0,583.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1175.0,1157.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04665506058889,42.32983179896554]}},{"type":"Feature","properties":{"resourceCoords":[1175.0,594.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04736211343601,42.33073120498591]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p50","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0050","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1550.0,1802.5 1583.9,1829.5 1512.0,1871.1 176.9,1907.3 186.1,497.9 211.1,493.3 210.7,35.9 371.8,32.5 687.6,25.9 895.6,21.6 1525.6,8.5 1472.4,499.3 1443.7,499.5 1395.7,500.0 1372.6,499.4 1430.4,1745.3 1588.1,1742.8 1550.0,1802.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[688.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07393110455223,42.31927265215789]}},{"type":"Feature","properties":{"resourceCoords":[1566.0,44.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07196548284602,42.320077330060144]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p51","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.10"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0051","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"276.8,65.0 637.8,225.6 929.3,324.0 1049.9,125.9 1132.0,121.7 1328.0,264.8 1263.7,492.6 1428.2,635.0 1436.8,717.4 1415.7,869.3 1375.8,1340.1 1351.7,1660.1 1346.6,1727.9 270.9,1846.5 224.8,358.8 268.2,136.6 275.8,64.6 276.8,65.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0051/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08837259800187,42.331302442272616]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0846542498088,42.33276403450979]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08233047687135,42.32948733043071]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08604882506441,42.32802573819353]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0052","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"244.5,1199.2 256.0,255.8 1365.7,108.5 1350.2,370.8 1366.5,639.9 1394.8,641.5 1329.2,1105.3 1335.7,1176.4 1382.7,1215.5 1262.5,1200.8 1232.8,1624.7 1033.7,1629.2 624.0,1629.5 239.2,1633.3 243.5,1199.2 244.5,1199.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1282.0,1162.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08225032751658,42.327828974442184]}},{"type":"Feature","properties":{"resourceCoords":[1282.0,1634.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08173814075295,42.32707762297996]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p53","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0053","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1627.0,862.6 1619.0,923.6 1573.3,1158.6 1592.1,1751.8 1376.0,1770.2 37.1,1777.6 32.0,1044.2 28.0,348.8 29.0,103.1 54.3,40.9 56.8,47.0 814.8,354.2 849.0,305.2 1001.0,385.3 1326.4,280.2 1398.7,335.1 1335.0,536.2 1526.5,637.1 1606.2,838.3 1627.0,847.6 1627.0,862.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0053/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0921477735703,42.331424475199555]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08862815833182,42.332805288711945]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08643281570157,42.32970371194346]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08995243094006,42.32832289843107]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p54","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.20"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0054","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1025.8,1860.5 1026.6,1846.0 568.0,1851.5 568.0,1821.0 70.0,1821.0 70.0,1857.6 49.6,1857.9 70.1,1067.4 70.4,1067.4 70.4,1055.9 71.2,616.0 71.7,405.7 70.5,236.5 70.8,134.4 71.0,99.5 95.2,99.5 1312.8,98.0 1513.4,81.7 1533.2,993.4 1571.7,989.3 1539.4,1850.7 1025.8,1860.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[568.0,1821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08674,42.326093]}},{"type":"Feature","properties":{"resourceCoords":[70.0,1821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0878982,42.3256339]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p55","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0055","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"47.6,1114.4 46.0,686.2 45.8,21.4 582.0,21.0 582.0,53.9 1075.8,47.5 1075.0,63.2 1627.0,52.2 1627.0,70.7 1627.0,78.8 1612.3,479.0 1589.3,478.6 1576.8,1106.8 1535.5,1106.6 1627.0,1709.8 1627.0,1884.0 1606.0,1885.0 1606.0,1926.0 1345.0,1926.0 898.8,1735.1 892.2,1773.8 617.4,1743.2 276.4,1709.2 46.1,1683.5 47.6,1114.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[582.0,667.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.085993,42.325061]}},{"type":"Feature","properties":{"resourceCoords":[582.0,21.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08674,42.326093]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p56","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0056","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"353.1,1915.0 352.1,1873.9 373.1,1872.4 368.8,1697.6 261.9,1094.5 303.4,1093.7 300.3,462.9 703.3,458.8 1108.0,458.4 1304.7,453.8 1205.2,1883.9 1131.6,1878.8 845.4,1861.3 841.5,1926.0 409.2,1926.0 375.2,1915.5 353.1,1915.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[810.0,464.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08292154725471,42.32663505061513]}},{"type":"Feature","properties":{"resourceCoords":[1245.0,464.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08197310826928,42.32698815701466]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p57","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0057","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"278.0,1729.0 278.0,1281.9 278.0,731.5 277.2,149.3 506.6,175.2 846.3,209.2 1120.0,239.8 1126.6,201.3 1573.3,392.7 1627.0,392.8 1627.0,1883.0 1606.0,1885.0 1607.0,1926.0 447.1,1926.0 302.4,1807.6 286.4,1729.0 278.0,1729.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[278.0,693.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.085342,42.322108]}},{"type":"Feature","properties":{"resourceCoords":[278.0,1729.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.084138,42.320447]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p6","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0006","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"577.5,604.8 587.5,1170.7 576.5,1669.8 1053.4,1697.5 1126.6,1624.2 1209.8,1399.5 1204.6,1164.8 1354.7,928.6 1438.0,961.4 1479.6,892.0 1329.4,784.8 1379.7,428.8 1278.7,239.6 1045.1,99.6 824.2,53.0 718.2,101.0 585.7,21.6 577.9,3.0 555.9,1.0 544.8,1.0 552.5,66.5 577.5,604.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1068.0,1164.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04566469495839,42.33031163111586]}},{"type":"Feature","properties":{"resourceCoords":[598.0,60.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.04807129198353,42.33160451027834]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p61","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.08"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0061","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"999.3,1458.3 1627.0,1369.1 1627.0,16.0 1600.0,16.0 1599.0,1.0 368.6,1.0 357.4,298.4 367.8,296.8 284.4,1459.0 822.0,1459.0 999.3,1458.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[822.0,1459.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0798694,42.3167505]}},{"type":"Feature","properties":{"resourceCoords":[291.0,1459.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0810776,42.316232]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p63","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0063","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1780.1 1.0,1797.2 121.3,1887.9 138.5,1850.3 171.8,1852.5 188.4,1885.8 559.4,1813.8 555.3,1877.3 936.1,1901.5 1452.0,1879.4 1593.6,819.1 1586.7,785.3 1615.3,32.6 1064.1,31.9 1066.3,1.0 179.3,1.0 38.2,8.9 38.0,11.0 1.0,11.0 1.0,34.5 84.8,34.8 68.1,1431.1 21.3,1429.1 7.8,1564.0 1.0,1780.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[65.0,1358.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08159614012953,42.31309703723304]}},{"type":"Feature","properties":{"resourceCoords":[64.0,42.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08329738239733,42.31525409833301]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p64","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0064","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"304.8,31.8 290.2,803.1 297.9,837.6 173.8,1926.0 250.6,1926.0 322.2,1852.0 1291.8,1915.2 1522.6,638.9 1489.9,644.8 1453.8,651.2 1370.6,666.1 1395.3,73.7 1396.2,8.0 1063.1,1.0 657.8,1.0 490.8,27.8 304.8,31.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[284.0,822.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07895159072757,42.31545271882286]}},{"type":"Feature","properties":{"resourceCoords":[1394.0,35.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.07748089670774,42.3177272296516]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p65","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0065","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"965.8,1828.3 966.8,1828.3 967.2,1808.3 1445.1,1813.2 1537.5,1814.2 1550.1,1333.8 1627.0,1329.6 1627.0,1267.7 1627.0,1220.5 1547.5,1206.1 1550.8,915.9 1562.0,916.1 1562.4,510.2 1566.5,510.2 1563.0,89.4 1251.6,85.9 1007.6,80.8 946.0,54.6 614.4,178.9 575.5,250.1 315.9,310.2 203.0,517.4 101.7,487.4 100.2,1276.1 156.7,1357.3 76.8,1750.5 1.0,1772.8 1.0,1796.8 312.4,1801.7 799.8,1806.7 966.1,1808.3 965.8,1828.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[504.0,909.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09436307407857,42.33136669491183]}},{"type":"Feature","properties":{"resourceCoords":[927.0,84.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09207015332632,42.3314096557713]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0066","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"789.0,1878.5 1187.3,1819.7 1311.5,1264.6 1363.5,1265.7 1518.0,62.7 1372.7,63.8 1263.5,63.5 495.5,61.6 115.2,60.2 119.4,483.8 115.4,483.9 115.7,892.5 104.4,892.5 101.6,1184.7 181.4,1198.5 181.6,1308.4 104.5,1313.2 92.7,1797.0 1.0,1796.7 1.0,1823.7 709.4,1835.7 789.0,1878.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09133285508801,42.330621038979]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08943778158404,42.32800368534946]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0935989908357,42.32633365818142]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09549406433968,42.32895101181096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p67","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0067","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1158.0,1813.0 929.0,1814.3 148.6,1799.8 119.2,1799.2 232.7,1246.8 284.4,1247.2 416.1,51.5 451.7,50.8 675.8,48.3 1157.0,42.6 1157.0,42.9 1573.4,48.1 1587.4,670.8 1574.6,670.9 1588.8,1243.5 1583.3,1243.6 1578.9,1810.2 1198.8,1812.7 1158.0,1813.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1158.0,673.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.090221,42.326397]}},{"type":"Feature","properties":{"resourceCoords":[1158.0,1813.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.092726,42.325436]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.69"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0068","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1287.2,1819.0 69.0,1832.9 74.1,1263.0 79.7,1263.0 66.0,687.1 78.9,687.0 65.5,60.7 492.7,64.0 492.1,42.2 1112.2,31.2 1536.7,22.2 1537.5,72.2 1537.9,100.8 1546.5,705.2 1539.6,862.4 1547.9,987.7 1550.2,1820.6 1287.2,1819.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0068/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.088315559507,42.32640649990069]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0864788791759,42.32375974918261]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09068652849189,42.322141066552696]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09252320882298,42.32478781727078]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p69","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0069","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"106.0,1000.6 98.2,875.8 105.7,719.5 99.6,118.1 98.8,40.0 662.5,37.2 1241.4,31.8 1470.4,29.9 1478.8,1828.1 929.9,1829.0 657.9,1822.5 377.4,1829.3 104.8,1829.2 106.0,1000.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1477.0,1219.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08762611185053,42.320654285834166]}},{"type":"Feature","properties":{"resourceCoords":[1477.0,1828.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08895984435574,42.32013598702399]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p7","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0007","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"324.5,1745.4 330.2,1688.0 330.0,1225.0 330.0,573.0 352.9,98.4 387.2,131.9 969.0,65.8 1251.9,104.3 1327.0,207.8 1335.9,1697.8 1127.1,1779.0 785.2,1739.7 759.0,1784.4 324.5,1745.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[330.0,1225.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0474675,42.3284456]}},{"type":"Feature","properties":{"resourceCoords":[330.0,573.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0460654,42.3290533]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0070","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"746.5,37.6 1188.5,42.8 1196.5,348.8 1200.7,659.5 1190.5,1277.9 1183.8,1835.3 950.5,1828.8 403.2,1821.9 430.1,34.0 746.5,37.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1211.0,40.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08410502945804,42.32041326210271]}},{"type":"Feature","properties":{"resourceCoords":[1211.0,1831.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08800800190298,42.31882328292679]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p71","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0071","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1610.8,1149.2 1627.0,1149.2 1627.0,1051.6 1627.0,965.2 1441.4,1.0 177.1,1.0 48.0,27.9 47.9,36.3 60.8,347.1 69.9,662.5 69.2,1290.9 71.1,1857.2 382.6,1858.6 1318.3,1862.0 1568.3,1862.9 1627.0,1862.1 1627.0,1618.8 1625.7,1285.3 1610.8,1149.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[87.0,665.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08545304534644,42.31985049957342]}},{"type":"Feature","properties":{"resourceCoords":[87.0,1855.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08802696475632,42.31883971647267]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p72","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.11"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0072","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"224.8,1348.7 237.0,1209.0 253.3,1212.2 290.2,1027.4 296.8,8.9 1511.7,294.2 1365.2,1215.6 1341.7,1436.9 1366.9,1441.0 1347.1,1551.5 1303.0,1845.8 1203.4,1926.0 305.5,1926.0 127.1,1906.2 111.2,1926.0 159.3,1684.1 224.8,1348.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[237.0,1209.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08475,42.3170023]}},{"type":"Feature","properties":{"resourceCoords":[1304.0,1839.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.084303,42.314837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0073__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 | 1921 | sanborn03985_026 p73 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.72"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6512.0"},{"label":"split_canvas_h","value":"7708.0"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0073__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0073","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"661.3,131.3 588.4,154.7 477.1,480.9 310.5,578.0 148.9,585.9 208.1,775.3 77.2,1266.7 67.2,1637.2 238.8,1801.5 1515.1,1754.7 1524.7,1225.4 1604.2,1024.5 1619.8,164.4 1627.0,164.4 1627.0,154.7 1627.0,144.4 1460.8,146.6 973.8,152.8 661.7,155.1 661.3,131.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0073__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":[-83.09730051355264,42.332606468835316]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09545256268467,42.32995770302599]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09966383318383,42.32832924911192]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.1015117840518,42.33097801492124]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p75","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0075","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.9,1572.0 49.0,744.9 43.9,187.4 46.0,129.1 64.9,144.4 105.1,67.7 178.1,130.4 371.9,117.9 563.3,234.5 1118.7,216.0 1532.5,343.3 1558.5,293.7 1615.7,833.8 1601.2,1473.8 1601.6,1698.0 983.0,1694.4 983.5,1748.7 54.0,1746.0 51.9,1572.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[61.0,1256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09669613575198,42.32483095198335]}},{"type":"Feature","properties":{"resourceCoords":[991.0,1256.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09461267118107,42.325638087928056]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p76","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0076","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"34.8,135.1 34.9,49.2 975.1,58.5 974.9,3.5 1600.6,11.5 1600.5,51.9 1593.8,1632.3 1588.2,1892.2 962.6,1891.0 418.4,1891.5 32.2,1889.8 34.8,135.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[424.0,53.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0952736,42.3243454]}},{"type":"Feature","properties":{"resourceCoords":[975.0,31.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0940836,42.3248603]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0077/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p77","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0077/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0077","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"44.7,1891.3 44.2,1803.0 981.8,1820.8 981.8,1828.2 1615.4,1797.6 1612.7,1435.0 1611.4,887.4 1617.8,616.1 1610.8,336.2 1610.8,64.3 977.5,63.4 426.8,64.2 35.8,62.6 1.0,62.6 1.0,1912.6 44.7,1891.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0077/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09412867069449,42.321079004907816]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09057847523465,42.322476186623355]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.08835744779455,42.319347184471276]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.09190764325439,42.31795000275574]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0078","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"41.9,372.9 1.0,393.0 1.0,1875.4 35.6,1926.0 44.2,1926.0 43.8,1824.6 613.5,1760.8 613.6,1773.2 962.3,1760.7 1595.8,1838.8 1597.2,1000.1 1598.0,693.9 1600.4,460.9 1599.5,275.2 971.2,307.5 971.2,300.2 41.8,285.1 41.9,372.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[977.0,752.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08935015199013,42.31823396872255]}},{"type":"Feature","properties":{"resourceCoords":[57.0,1331.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09070254515723,42.31649872958689]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p79","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0079","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"383.6,1206.5 383.5,1843.5 810.1,1843.5 1235.2,1852.5 1235.0,1765.6 1233.4,1587.5 1233.3,740.9 1230.0,170.2 1232.4,110.5 1193.3,78.6 473.8,49.3 458.9,1.0 381.8,1.0 383.3,532.0 383.6,1206.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[384.0,1336.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09849150926217,42.32398113707433]}},{"type":"Feature","properties":{"resourceCoords":[384.0,1837.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09791330733579,42.32317195929342]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p80","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0080","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"415.2,1850.8 413.0,966.5 413.0,324.2 413.0,71.0 837.5,71.0 1260.5,80.0 1264.2,1847.0 1228.5,1847.2 1228.4,1926.0 863.3,1926.0 864.1,1848.9 461.6,1850.5 415.2,1850.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[413.0,1191.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.096608,42.321343]}},{"type":"Feature","properties":{"resourceCoords":[413.0,71.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.097907,42.323161]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p81","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0081","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"487.8,1824.2 778.6,1812.6 1274.7,1787.7 1274.5,1280.3 1283.4,1280.0 1285.7,781.8 1271.8,781.9 1277.4,127.3 1264.3,128.8 1265.2,235.1 1256.1,235.2 1094.7,1.0 682.6,1.0 660.1,784.5 572.5,784.9 586.9,1.0 553.0,1.0 534.0,785.0 496.2,785.2 492.4,92.3 428.4,206.8 419.4,207.3 380.9,291.7 387.1,785.7 382.2,1179.7 388.1,1828.7 487.8,1824.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1245.0,1818.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08833397532125,42.313040709338196]}},{"type":"Feature","properties":{"resourceCoords":[385.0,1818.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.09014243811333,42.31233913580317]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p82","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.40"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0082","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"11.4,1816.7 318.4,1799.9 318.6,1812.3 502.1,1926.0 1074.8,1926.0 1247.8,1750.6 1331.8,1746.2 1567.6,1659.0 1627.0,1656.8 1627.0,567.0 1624.3,567.2 1622.4,493.6 1619.8,235.3 1619.0,150.2 951.9,75.8 585.4,93.2 585.1,80.2 1.0,152.6 1.0,808.7 13.9,808.5 15.8,1307.8 7.0,1308.2 11.4,1816.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[976.0,625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0875625,42.3157417]}},{"type":"Feature","properties":{"resourceCoords":[976.0,1765.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.086328,42.313965]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p83","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.30"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0083","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1092.2,1715.9 974.1,1735.2 925.8,1825.1 797.3,1756.0 572.0,1759.1 521.2,1822.9 338.9,1807.7 275.3,1926.0 259.4,1926.0 244.5,1926.0 265.1,100.9 342.9,98.1 619.1,89.9 1090.2,71.1 1381.2,60.7 1381.2,72.4 1554.4,184.3 1627.0,185.7 1627.0,1441.6 1370.9,1641.3 1341.4,1833.9 1092.2,1715.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0083/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0907913,42.3122728]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0872042,42.3136991]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0849211,42.3105593]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.0885082,42.309133]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0086/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p86","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0086/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0086","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"227.2,76.1 1.0,288.9 1.0,1513.0 134.6,1513.9 262.3,1590.2 261.3,1627.5 861.7,1724.5 863.1,1682.0 1164.0,1862.4 1213.8,1790.1 1338.5,1881.2 1342.4,1640.3 1354.2,1500.6 1402.7,1501.9 1397.5,57.9 1309.9,59.0 1309.6,40.5 1299.7,59.1 1191.5,58.6 904.9,65.6 831.2,1.0 532.6,1.0 307.5,74.8 227.2,76.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0086/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1296.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08346324830713,42.31517198425764]}},{"type":"Feature","properties":{"resourceCoords":[279.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.08566358332124,42.31425812752887]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0087/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p87","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0087/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0087","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1591.0,789.0 1560.7,1869.9 1000.8,1833.5 1000.8,1836.9 94.7,1848.1 98.1,112.1 257.9,31.3 1100.1,432.7 1257.2,217.2 1218.8,413.1 1471.0,548.2 1525.1,493.9 1593.4,790.3 1591.0,789.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0087/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[106.0,863.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.110485,42.329796]}},{"type":"Feature","properties":{"resourceCoords":[106.0,1848.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.109328,42.3282]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0088/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p88","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0088/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0088","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"989.9,73.0 989.9,69.6 1554.2,110.2 1533.1,819.9 1574.8,820.8 1548.9,868.7 1459.7,862.2 1348.2,1161.5 1165.9,1062.8 1014.6,1139.8 896.1,1343.2 964.8,1480.8 778.0,1639.0 676.5,1826.5 348.9,1824.8 71.4,1699.6 76.7,77.7 989.9,73.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0088/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.10960998158818,42.32824825433217]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.10608324588794,42.32967001039701]}},{"type":"Feature","properties":{"resourceCoords":[1628.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.1038228933238,42.326562043051034]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1927.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-83.10734962902403,42.3251402869862]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0089/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p89","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0089/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0089","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"173.5,1926.0 159.2,1926.0 184.8,119.1 187.2,120.3 189.2,128.1 858.5,383.1 1132.4,241.1 1124.9,304.0 1281.9,452.1 1295.3,667.8 1547.7,873.7 1522.4,1019.2 1321.8,1132.4 1236.5,1297.0 1261.4,1410.1 1144.9,1441.5 977.0,1362.9 886.6,1424.6 738.2,1823.7 447.0,1789.7 233.7,1862.8 201.0,1926.0 173.5,1926.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0089/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[724.0,395.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.1058263,42.3312111]}},{"type":"Feature","properties":{"resourceCoords":[167.0,110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.1073663,42.3312053]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0091/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p91","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0091/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0091","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"98.3,1603.3 1171.5,1594.3 1242.7,1592.2 1511.5,1589.8 1518.1,1111.1 1540.0,700.8 1588.4,700.6 1428.3,98.1 1367.5,57.4 1212.4,99.1 1053.3,288.2 329.4,275.3 141.1,332.6 117.2,1341.3 1.0,1384.7 1.0,1395.5 93.1,1386.5 98.3,1603.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0091/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[144.0,1125.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.10523,42.322531]}},{"type":"Feature","properties":{"resourceCoords":[144.0,305.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.106192,42.323863]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0092/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p92","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0092/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0092","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"122.0,124.3 563.0,147.2 842.4,81.8 857.6,115.3 1349.1,199.5 1543.2,121.0 1619.5,381.6 1543.0,380.4 1536.6,911.2 1527.0,1584.0 767.0,1584.0 128.8,1583.3 140.4,1102.0 166.6,689.5 215.3,689.9 60.5,82.2 122.0,124.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0092/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[767.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.100293,42.323522]}},{"type":"Feature","properties":{"resourceCoords":[1527.0,1584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.098642,42.32419]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0093/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p93","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0093/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0093","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"245.6,711.5 244.3,640.0 245.4,127.2 750.5,140.1 750.5,133.8 1015.3,137.5 1507.4,144.4 1486.5,682.6 1458.5,682.3 1498.5,1220.9 1504.5,1221.0 1489.7,1759.8 1589.0,1761.0 1439.9,1820.6 1358.3,1810.8 1293.6,1867.7 1354.6,1909.6 1285.2,1913.5 815.9,1866.0 732.5,1803.5 563.2,1836.5 557.8,1892.3 413.5,1788.0 242.5,1790.2 245.6,711.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0093/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[751.0,1212.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.102907,42.321407]}},{"type":"Feature","properties":{"resourceCoords":[751.0,1751.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.104078,42.320932]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0094/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p94","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0094/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0094","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"318.8,1770.7 219.5,1770.5 228.9,1231.8 222.9,1231.8 177.5,694.0 205.5,694.1 220.9,156.0 456.0,157.0 1109.5,157.9 1380.0,160.1 1381.7,270.5 1386.5,600.0 1405.7,1775.9 617.1,1880.4 170.4,1831.8 318.8,1770.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0094/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[456.0,1771.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.102941,42.319355]}},{"type":"Feature","properties":{"resourceCoords":[456.0,157.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.099413,42.320752]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0095/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p95","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0095/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0095","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"243.8,1120.7 237.3,364.4 869.8,368.4 1122.4,370.0 1482.2,372.2 1457.0,978.0 1491.7,978.2 1479.2,1519.3 1013.3,1517.2 749.6,1516.0 749.7,1522.2 246.7,1514.2 243.8,1120.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0095/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[244.0,1125.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.10030220890606,42.32351781325063]}},{"type":"Feature","properties":{"resourceCoords":[244.0,368.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0986419609691,42.32417604801112]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0096/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p96","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0096/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0096","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1369.2,535.0 1379.8,1519.3 1109.6,1516.4 456.8,1513.5 197.8,1511.5 211.7,969.1 176.9,968.8 203.7,361.6 485.5,364.0 1369.9,369.6 1369.2,535.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0096/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[710.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.097934,42.320814]}},{"type":"Feature","properties":{"resourceCoords":[710.0,366.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.096608,42.321343]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0097/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p97","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0097/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0097","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"148.5,541.8 98.8,432.3 148.7,276.1 147.2,265.1 1318.7,243.1 1485.7,240.1 1464.5,1729.2 1262.2,1730.7 685.2,1732.6 149.0,1731.0 135.9,1674.8 148.5,541.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0097/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1220.0,1731.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.097769,42.316362]}},{"type":"Feature","properties":{"resourceCoords":[149.0,1731.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.100122,42.315436]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0098/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p98","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0098/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0098","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1560.0,1715.0 159.1,1715.3 134.5,1715.4 164.5,236.8 324.6,235.0 433.9,233.8 1408.8,223.6 1572.6,224.4 1618.6,224.6 1627.0,224.7 1627.0,1889.0 1607.0,1890.0 1607.0,1926.0 1606.4,1926.0 1587.9,1668.0 1560.4,1667.8 1560.0,1715.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0098/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[423.0,1715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.096598,42.316831]}},{"type":"Feature","properties":{"resourceCoords":[1560.0,1715.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0940906,42.3178322]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0099/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Detroit, Michigan | 1921 | sanborn03985_026 p99","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-17T03:09:29Z","modified":"2026-10-17T03:09:29Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0099/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0099","type":"ImageService3","width":1628,"height":1927},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"129.9,1.0 129.7,1.0 129.4,14.4 66.8,456.6 98.9,1901.7 96.0,1926.0 134.7,1926.0 134.9,1882.5 672.3,1873.5 672.2,1874.0 1204.9,1844.2 1205.0,1837.7 1423.1,1876.9 1489.5,908.2 1470.5,908.9 1469.9,60.8 1259.0,61.4 680.4,60.6 142.5,56.4 129.9,1.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114dm:g03985192101:03985_01_1921-0099/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1207.0,1490.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.0961102,42.3140456]}},{"type":"Feature","properties":{"resourceCoords":[137.0,1490.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-83.098448,42.313115]}}]}}]}