{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn04023_021.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Grand Rapids, Michigan | 1952 | mapsnap generated fit (2026-10-18)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-18"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"77"},{"label":"placed","value":"52"},{"label":"unplaced","value":"25"},{"label":"fit sources","value":"georef-snap 30, georef 20, snap:0 2"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"19 sheet(s) cut into 42 panels"},{"label":"unplaced pages","value":"p543__1 (tier 3, 42.95174,-85.70796 +/-751m); p543__2 (tier 1, 42.95480,-85.70743 +/-222m); p544__1 (tier 1, 42.99238,-85.66028 +/-103m); p544__2 (tier 1, 43.01228,-85.64447 +/-244m); p544__3 (tier 1, 43.00701,-85.64831 +/-146m); p545__2 (tier 1, 43.03038,-85.67055 +/-185m); p545__3 (tier 1, 43.03680,-85.66549 +/-174m); p546__1 (tier 4, 42.99237,-85.67481 +/-7930m); p546__2 (tier 1, 43.02635,-85.66788 +/-103m); p548__2 (tier 1, 42.99126,-85.68935 +/-100m); p551__2 (tier 1, 42.99495,-85.68803 +/-115m); p552__2 (tier 1, 42.99862,-85.68565 +/-152m); p555 (tier 2, 42.99387,-85.68369 +/-208m); p557__1 (tier 1, 42.98953,-85.68404 +/-100m); p558__2 (tier 1, 42.98662,-85.68136 +/-100m); p560__2 (tier 1, 42.99397,-85.71789 +/-106m); p562__2 (tier 2, 42.98665,-85.71003 +/-100m); p562__3 (tier 1, 42.99226,-85.72758 +/-100m); p563 (tier 3, 43.00136,-85.71014 +/-751m); p903__2 (tier 1, 42.99410,-85.66081 +/-100m); p908__2 (tier 2, 42.99729,-85.65893 +/-100m); p908__3 (tier 2, 42.99729,-85.65893 +/-100m); p910__1 (tier 3, 43.01696,-85.65794 +/-751m); p910__2 (tier 3, 43.01696,-85.65794 +/-751m); p921 (tier 1, 42.96426,-85.63968 +/-274m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0545__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p545 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.18"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4769.6"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0545__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0545","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"737.3,1794.7 956.1,1788.6 1006.2,1635.9 979.0,1390.1 688.3,502.6 791.9,268.4 461.7,218.9 263.8,59.4 183.7,153.7 216.3,237.7 129.9,503.9 225.4,1840.6 324.9,1915.3 568.4,1916.6 737.3,1794.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0545__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":[-85.66601555567365,43.03499996404578]}},{"type":"Feature","properties":{"resourceCoords":[1192.4,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.66365558316151,43.03355544305858]}},{"type":"Feature","properties":{"resourceCoords":[1192.4,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.6669776710617,43.03061434506997]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.66933764357384,43.03205886605717]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p547 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"46.0,1484.3 218.0,1494.2 518.1,1600.2 523.9,1757.4 1060.7,1783.5 1339.7,1799.1 1496.6,1667.2 1497.2,1559.8 1509.8,1560.2 1503.7,1067.9 1504.5,1034.4 1497.2,573.5 1493.5,243.4 1422.1,244.2 1422.0,221.5 1421.1,97.2 1217.0,81.5 1217.0,82.6 1026.8,97.0 1028.3,97.6 985.4,376.6 967.1,369.1 966.5,446.4 933.0,482.8 565.5,472.3 164.4,509.2 109.0,541.9 115.6,1468.4 45.9,1465.9 46.0,1484.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1221.0,255.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69212832706927,42.99371685283959]}},{"type":"Feature","properties":{"resourceCoords":[774.0,1525.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6943153793551,42.98904271055584]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p547 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.84"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"3771.2"},{"label":"split_canvas_h","value":"1888.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"867.7,424.5 866.9,390.5 941.7,342.4 941.2,268.5 940.8,218.7 861.3,119.6 860.6,119.6 860.3,98.1 858.8,1.0 850.4,1.0 847.5,59.4 739.1,32.7 570.7,58.2 286.5,42.0 241.4,90.5 162.8,108.9 154.1,415.6 257.1,456.6 450.5,441.1 450.4,440.0 658.2,455.0 658.2,453.7 867.7,424.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0547__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[242.9,128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69318584895977,42.995475037168156]}},{"type":"Feature","properties":{"resourceCoords":[864.8,128.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69011952372173,42.99548444064723]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0548__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p548 [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":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0548__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0548","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"417.0,1609.9 705.4,1629.0 1008.6,1649.2 1008.6,1671.8 1192.5,1748.2 1192.7,1818.9 1310.6,1821.4 1434.0,1820.5 1448.2,1820.6 1448.2,1799.1 1447.6,1383.0 1447.8,697.2 1385.6,692.6 1664.0,527.2 1664.0,422.0 1445.3,422.0 1229.5,422.0 1229.5,142.8 1229.5,134.7 708.8,173.3 708.7,74.9 705.9,48.4 606.1,1.1 600.7,1.0 490.0,1.0 355.5,84.2 355.7,117.4 150.9,142.4 150.2,267.0 150.1,289.4 220.9,289.6 220.5,617.1 222.1,1074.4 220.8,1107.6 220.7,1596.0 417.0,1609.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0548__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[149.0,295.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69112514139474,42.99374237493817]}},{"type":"Feature","properties":{"resourceCoords":[711.0,1093.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68819826615554,42.99083556301929]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0549/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p549","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.59"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0549/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0549","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"758.2,1637.2 821.9,1637.9 1024.3,1782.5 1122.3,1783.0 1135.2,1792.0 1664.0,1773.1 1664.0,1728.8 1433.7,1713.9 1411.9,763.3 1408.6,175.7 1292.2,161.1 1282.4,165.1 1282.0,246.7 900.5,259.3 798.0,207.8 694.9,287.4 453.1,286.1 408.1,1317.3 329.1,1266.0 317.4,1277.5 1.0,1051.5 1.0,1121.3 35.8,1147.7 2.7,1284.1 1.0,1291.1 1.0,2017.0 4.0,2017.0 5.0,2002.0 60.0,2002.0 81.0,2008.0 82.0,2017.0 417.0,2017.0 418.0,2008.0 774.0,2007.0 793.0,2008.0 794.0,2017.0 806.0,2017.0 807.0,2008.0 825.0,2008.0 826.0,2017.0 870.0,2017.0 871.0,2007.0 886.9,2006.7 892.7,1997.8 951.8,1908.4 960.8,1894.8 975.9,1871.9 985.1,1866.3 1011.7,1849.9 1033.4,1847.9 1054.5,1855.0 758.2,1637.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0549/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.68432138611972,42.999009166738766]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.6801354733165,42.999024834392564]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.68010969186436,42.99528802783117]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.68429560466758,42.995272360177374]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p550 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.90"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"117.3,804.8 135.5,1761.2 384.7,1778.5 748.8,1803.5 982.2,1819.7 1192.4,1830.7 1195.5,1489.9 1116.1,1350.0 1111.9,990.8 1129.7,639.1 1257.3,295.8 1169.7,258.4 1521.5,254.2 1515.0,95.5 1015.0,158.9 1014.6,102.3 562.6,88.3 562.4,74.5 116.1,91.7 116.2,195.2 1.0,198.4 1.0,203.4 116.3,213.6 117.3,804.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[568.0,821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67962748248013,42.99758655800175]}},{"type":"Feature","properties":{"resourceCoords":[1022.0,821.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67848498669028,42.997593954850274]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p550 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.57"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4728.0"},{"label":"split_canvas_y","value":"1324.4"},{"label":"split_canvas_w","value":"1932.0"},{"label":"split_canvas_h","value":"6747.6"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1664.0,1821.5 1560.3,1818.8 1555.7,1367.0 1569.5,1367.2 1596.5,910.6 1653.8,911.8 1603.8,404.4 1319.1,408.2 1207.8,1212.7 1275.6,1385.8 1314.7,1936.1 1664.0,1949.0 1664.0,1821.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0550__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1358.0,1358.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67965393649267,42.99932033308767]}},{"type":"Feature","properties":{"resourceCoords":[1358.0,911.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67854260752686,42.999350306839226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0551__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p551 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0551__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0551","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"78.8,914.4 253.8,1945.5 263.8,2004.7 313.0,2005.0 314.0,2017.0 318.0,2017.0 319.0,2005.0 356.0,2005.0 357.0,2017.0 362.0,2017.0 363.0,2005.0 402.0,2005.0 403.0,2017.0 411.0,2017.0 412.0,2005.0 454.0,2005.0 465.0,2008.0 466.0,2017.0 472.0,2017.0 473.0,2008.0 493.0,2008.0 494.0,2017.0 504.0,2017.0 505.0,2005.0 539.0,2005.0 540.0,2017.0 571.0,2017.0 572.0,2005.0 627.0,2005.0 628.0,2017.0 998.0,2017.0 999.0,2008.0 1033.0,2006.0 1034.0,2017.0 1052.3,2017.0 1058.3,2013.7 1059.0,2006.0 1072.4,2006.0 1450.6,1798.5 1529.8,1664.4 1372.8,1760.5 1606.9,770.5 1573.8,773.6 1556.3,54.1 1498.4,66.8 1475.0,87.8 947.8,102.3 949.0,118.3 758.3,136.2 716.4,140.1 716.5,141.4 563.9,284.7 563.8,284.7 479.1,570.7 445.3,674.8 403.0,677.1 327.3,885.1 275.0,895.6 78.8,914.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0551__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[747.0,834.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68838753191945,42.995477635178524]}},{"type":"Feature","properties":{"resourceCoords":[747.0,104.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69022555596946,42.995575800729]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0552__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p552 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.71"},{"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":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0552__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0552","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1034.0,163.4 927.7,191.1 884.0,202.4 837.7,214.1 423.2,317.5 176.1,379.1 164.3,382.2 88.8,1399.2 229.1,1279.2 158.3,1458.8 63.5,1535.5 1.0,1686.2 1.0,2017.0 446.1,2017.0 463.8,1977.0 503.5,1967.4 532.0,1960.5 1291.8,98.8 1292.7,96.7 1291.7,96.3 1165.8,129.1 1061.0,156.4 1034.0,163.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0552__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[842.0,218.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68840113846034,42.99835409116452]}},{"type":"Feature","properties":{"resourceCoords":[1436.0,76.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68840675119883,42.99947901253405]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0553/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p553","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.82"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0553/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0553","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1536.5,99.2 1511.8,105.2 1315.4,62.9 1271.8,70.4 857.9,80.3 226.5,164.2 132.5,237.5 121.6,237.6 113.9,446.0 104.5,621.3 101.5,677.6 82.1,1038.8 81.1,1056.9 125.2,1057.3 150.1,1580.6 141.2,1593.5 141.8,1690.5 1.0,1891.2 1.0,1954.3 213.8,1659.9 206.9,1680.8 209.2,1702.2 231.6,1737.5 268.2,1760.9 370.8,1826.5 409.5,1851.3 466.1,1873.0 640.5,1868.3 538.8,2017.0 1433.0,2017.0 1434.0,2008.0 1664.0,2007.0 1664.0,1976.2 1581.6,1825.6 1554.0,1826.8 1510.2,1346.5 1527.5,1345.7 1552.0,839.5 1556.7,837.2 1560.9,501.6 1541.5,139.8 1536.5,99.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0553/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[395.0,1366.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6809034352698,42.99524409569291]}},{"type":"Feature","properties":{"resourceCoords":[116.0,357.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67833682434242,42.9957502622826]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0554/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p554","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0554/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0554","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"644.5,1836.4 637.8,1835.5 446.9,2017.0 310.3,2017.0 221.2,1839.8 193.5,1840.1 166.4,1355.6 183.7,1355.3 226.3,847.2 231.1,845.0 247.2,507.6 240.4,143.2 236.9,102.2 557.4,36.8 709.4,92.3 957.0,82.5 956.5,142.2 1276.9,144.8 1466.2,142.6 1470.0,623.1 1459.0,623.1 1411.1,1090.3 1422.5,1090.5 1437.8,1560.5 1441.2,1560.5 1407.3,1806.4 644.5,1836.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0554/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[-897.0,1351.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6809376,42.9951349]}},{"type":"Feature","properties":{"resourceCoords":[775.0,142.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6777669,42.992114]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0556/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p556","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0556/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0556","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1577.0,151.8 1574.0,402.1 1576.9,1094.3 1574.2,1556.6 1574.5,1604.3 1575.2,1759.5 699.0,1826.5 698.8,1790.7 699.0,1774.2 163.7,1800.7 194.7,1556.7 191.4,1556.7 171.4,1091.0 160.1,1091.0 202.8,627.4 213.7,627.3 205.1,151.1 384.0,147.2 661.4,152.9 946.2,151.7 1577.0,151.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0556/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[701.0,624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.678899,42.989899]}},{"type":"Feature","properties":{"resourceCoords":[701.0,1557.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.681274,42.989867]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0557__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p557 [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"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":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0557__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0557","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"174.7,219.3 167.9,218.5 1.0,383.3 1.0,1146.7 107.3,1321.1 115.2,1196.4 1490.2,1181.3 1490.2,1155.0 1488.2,697.9 1485.0,641.6 1481.2,414.9 1477.6,160.4 1477.7,143.8 174.7,219.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0557__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[149.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6845443195371,42.99229426569111]}},{"type":"Feature","properties":{"resourceCoords":[1477.0,1208.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68451072899683,42.98984478206668]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0558__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p558 [1]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0558__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0558","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"390.9,664.5 396.0,762.5 393.0,1194.0 1253.7,1187.9 1251.9,714.5 1254.3,189.2 1254.1,159.1 386.5,227.8 388.3,442.1 390.9,664.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0558__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[393.0,1194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.684443,42.989821]}},{"type":"Feature","properties":{"resourceCoords":[1254.0,416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.682409,42.988225]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0559/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p559","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0559/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0559","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"621.2,1887.5 621.3,1880.8 1010.0,1894.5 1547.1,1933.3 1611.2,1727.5 1588.8,244.4 1537.8,265.1 1504.4,119.8 1164.4,120.6 927.2,43.7 217.8,73.6 214.2,1.0 155.1,1.0 155.5,317.1 163.3,683.0 157.4,960.0 158.5,1244.2 158.0,1869.3 621.2,1887.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0559/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[158.0,1004.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6776981,42.9899067]}},{"type":"Feature","properties":{"resourceCoords":[158.0,1874.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6776558,42.988284]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0560__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p560 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0560__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0560","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1576.4,1203.2 1534.2,976.2 1481.1,864.8 1297.2,857.5 1210.0,800.6 1156.4,718.6 1104.1,547.2 1086.5,508.9 1081.3,497.4 1081.3,483.7 1081.3,472.6 1045.7,355.9 1038.8,142.3 814.8,115.8 595.6,30.6 149.7,62.5 93.9,94.5 74.4,149.3 110.4,1898.1 187.6,1903.3 1119.1,1884.5 1467.2,1848.3 1513.5,1803.7 1532.7,1804.2 1570.6,1572.6 1545.0,1572.0 1545.5,1342.6 1639.1,1345.2 1552.1,1235.5 1576.4,1203.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0560__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[509.0,1294.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.71530278454357,42.987757592798]}},{"type":"Feature","properties":{"resourceCoords":[1243.0,1780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.7115775953368,42.986028297921074]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0561/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p561","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0561/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0561","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1618.8,160.7 1585.3,1811.7 1359.5,1933.0 166.9,1910.8 118.7,162.4 154.8,159.8 641.8,123.0 1619.6,51.6 1620.2,160.7 1618.8,160.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0561/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[649.0,1033.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.7002540627741,42.98833979540753]}},{"type":"Feature","properties":{"resourceCoords":[649.0,108.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69790584817322,42.98824611761972]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0562__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p562 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.80"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0562__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0562","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.4,49.6 178.4,112.6 349.0,325.0 167.1,321.0 168.9,767.0 218.7,767.9 147.7,1218.6 110.5,1217.8 20.9,1305.1 39.5,1303.1 55.5,1718.2 118.0,1869.3 890.3,1893.8 1506.6,1816.0 1569.7,1373.2 1528.0,1279.7 1177.8,1253.6 1135.5,1203.0 1119.6,780.7 1168.0,359.2 1541.0,285.4 1543.0,135.2 1500.1,134.6 1472.3,69.9 1400.2,111.8 814.4,46.9 634.7,109.0 227.6,60.7 225.4,49.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0562__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[675.0,1233.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.708764,42.985946]}},{"type":"Feature","properties":{"resourceCoords":[349.0,325.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.709635,42.98765]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0564/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p564","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0564/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0564","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1116.8,1878.2 233.9,1887.4 99.2,1776.6 112.9,1448.8 215.8,1449.5 160.4,526.8 131.7,67.1 452.3,69.6 1019.9,238.5 1045.2,530.1 1108.6,1449.1 1132.1,1880.4 1116.8,1878.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0564/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[177.0,988.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69794992500351,42.987350714518556]}},{"type":"Feature","properties":{"resourceCoords":[1111.0,1872.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6955327900333,42.98553244262084]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0565/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p565","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0565/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0565","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"98.8,1212.7 64.3,278.4 1078.8,309.3 1499.5,325.2 1545.5,790.4 1572.3,791.1 1616.0,792.3 1622.2,1018.0 1646.4,1684.5 1614.0,1682.5 1559.1,1745.5 1274.8,1782.8 788.6,1773.6 108.5,1651.0 98.8,1212.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0565/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1065.0,320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69290295491489,42.98808286381712]}},{"type":"Feature","properties":{"resourceCoords":[1041.0,1680.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69300090820428,42.98544070132506]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0566/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p566","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0566/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0566","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1583.4,1861.2 1149.3,1910.7 323.5,1877.1 283.2,1203.5 271.6,975.3 227.4,975.1 200.3,975.1 142.7,505.6 250.6,507.1 539.7,243.0 532.3,37.9 556.3,37.6 935.3,43.9 1491.9,50.6 1517.3,533.2 1544.1,989.2 1564.0,1378.7 1591.8,1862.6 1583.4,1861.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0566/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[528.0,530.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69073983000897,42.987993637897134]}},{"type":"Feature","properties":{"resourceCoords":[528.0,72.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.69070024798778,42.98887280685743]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0567/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p567","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0567/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0567","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1594.7,1889.7 555.0,1906.8 188.4,1850.3 157.9,1356.5 136.0,959.0 106.7,493.8 78.8,1.3 676.0,6.3 678.6,50.6 1048.3,179.4 1056.7,318.1 1288.3,309.6 1530.4,293.7 1562.4,968.4 1613.2,1906.9 1594.7,1889.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0567/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1097.0,954.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68564211820268,42.98699044656029]}},{"type":"Feature","properties":{"resourceCoords":[137.0,954.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6881100399422,42.987057361982096]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0568/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p568","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0568/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0568","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"153.5,813.0 124.3,132.7 152.5,131.2 669.1,104.2 929.3,94.1 1342.5,73.1 1390.1,70.5 1429.1,836.9 1416.6,1779.2 1133.4,1870.2 758.0,1889.6 256.4,1812.0 200.4,1759.5 153.5,813.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0568/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1426.0,834.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68120368842038,42.98681453577662]}},{"type":"Feature","properties":{"resourceCoords":[1426.0,1790.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6812830603152,42.98503109109026]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0569/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p569","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0569/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0569","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1582.3,1933.6 157.5,1880.5 139.8,1886.2 155.1,933.6 117.7,158.8 583.6,139.0 1280.8,102.5 1533.2,93.3 1565.8,659.5 1582.0,979.4 1615.7,1714.6 1622.1,1933.8 1582.3,1933.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0569/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1574.0,996.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67762066026187,42.986615729393016]}},{"type":"Feature","properties":{"resourceCoords":[641.0,127.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67990927631489,42.988270948104166]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0570/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p570","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0570/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0570","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"153.6,1668.3 115.0,937.7 96.8,619.9 60.5,57.4 60.2,52.6 525.7,45.0 525.4,38.2 916.0,30.3 1456.7,39.1 1452.3,56.5 1525.7,75.6 1600.3,327.2 1604.6,1831.3 1533.6,1877.5 655.1,1902.4 161.3,1886.1 153.6,1668.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0570/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[578.0,912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67642193191841,42.986662194781374]}},{"type":"Feature","properties":{"resourceCoords":[968.0,912.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.67543222455963,42.9866356473547]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0571/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p571","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.58"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0571/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0571","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1516.2,1732.5 1477.1,1707.2 1471.3,1712.9 505.0,1023.4 504.0,1022.7 503.8,1023.2 506.4,1141.0 507.9,1209.1 508.4,1231.4 511.4,1466.2 512.9,1592.2 513.4,1614.6 157.1,1596.9 161.3,1626.0 109.3,1558.5 84.4,1247.1 135.6,801.8 117.8,562.8 208.4,504.9 208.5,374.6 100.0,312.9 111.1,121.0 143.7,84.8 426.1,125.0 607.0,208.5 1153.8,176.6 1352.8,238.4 1407.1,296.4 1497.6,296.5 1512.0,350.8 1577.2,350.9 1602.1,709.4 1580.1,912.2 1518.5,970.0 1532.7,1219.9 1536.5,1219.9 1516.2,1732.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0571/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[496.0,1247.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68847829686997,42.99837786956095]}},{"type":"Feature","properties":{"resourceCoords":[496.0,148.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.68848512109432,43.00247208202564]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0572/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p572","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0572/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0572","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"118.0,1765.2 64.2,437.0 115.2,73.5 932.1,60.5 1272.8,162.1 1558.1,116.8 1607.5,562.5 1554.6,656.2 1553.7,1071.8 1620.2,1758.6 1560.3,1837.6 1078.1,1886.3 984.5,1826.2 240.4,1840.5 118.0,1765.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0572/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[608.0,406.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.74914128700611,42.988761060133385]}},{"type":"Feature","properties":{"resourceCoords":[1021.0,1608.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.74803627248225,42.98655249320185]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0573/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p573","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.55"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0573/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0573","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1568.7,1072.4 1502.8,1245.5 1501.1,1577.7 1551.4,1628.5 1485.4,1823.2 1087.6,1936.8 842.7,1798.3 597.1,1789.8 590.4,1703.2 193.2,1679.5 142.4,1729.8 150.3,147.9 785.8,180.0 930.9,58.0 1566.1,140.6 1563.7,617.3 1522.5,636.5 1568.7,1072.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_05_1952-0573/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.76572702699748,42.97397423925028]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.76570560179444,42.970864706501615]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.77085631728255,42.97084570594304]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.7708777424856,42.97395523869171]}},{"type":"Feature","properties":{"resourceCoords":[954.0,272.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.766409,42.97219]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0901/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p901","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0901/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0901","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"782.7,212.9 781.6,270.4 1100.0,266.0 1535.3,268.4 1599.6,268.3 1601.2,749.6 1602.7,1239.5 1608.0,1239.5 1599.3,1723.9 1506.2,1723.2 1505.4,1774.5 1347.7,1827.3 141.4,1816.5 65.8,1497.5 112.1,995.7 58.3,676.5 127.4,283.5 119.8,202.4 782.7,212.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0901/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1100.0,752.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6696923,42.9936987]}},{"type":"Feature","properties":{"resourceCoords":[1100.0,266.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.669681,42.994601]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0902/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p902","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0902/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0902","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"109.4,1726.1 576.3,1860.0 931.9,1880.5 1211.4,1750.8 1566.4,1749.7 1606.9,1692.9 1594.1,1252.6 1582.2,726.3 1565.0,238.0 455.5,255.1 72.2,261.6 80.8,741.3 89.3,1229.7 94.6,1229.7 92.9,1712.7 1.0,1713.2 1.0,1764.1 109.4,1726.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0902/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[938.0,1706.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.666296,42.991861]}},{"type":"Feature","properties":{"resourceCoords":[526.0,1222.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6673156,42.9927802]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0903__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p903 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0903__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0903","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"95.7,311.1 104.2,803.2 106.4,1333.4 111.3,1777.0 113.0,1774.8 850.3,1865.7 1042.8,1813.9 1088.5,1733.0 1165.2,1596.4 1245.0,1454.0 1245.0,1434.5 1256.0,1434.5 1279.1,1393.2 1479.4,1036.5 1495.3,1036.7 1555.0,942.1 1578.8,957.1 1617.2,665.0 1579.1,351.5 1664.0,347.2 1664.0,318.1 1116.6,315.4 95.7,311.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0903__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1086.0,803.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.66211542435708,42.99364720178323]}},{"type":"Feature","properties":{"resourceCoords":[115.0,1772.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.66458315709538,42.99186523282555]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p904 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.01"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2830.8"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"5241.2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1.0,1898.8 1.0,1901.7 71.0,1881.9 372.6,1951.3 1563.3,1845.8 1573.5,1495.5 1494.9,1305.2 1555.8,995.6 1252.4,826.2 1031.7,1063.8 798.6,1093.1 563.6,1014.1 574.5,922.4 547.1,905.6 480.3,1014.6 462.0,1014.6 238.7,1425.0 111.5,1658.7 25.9,1816.0 1.0,1898.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1140.0,1870.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6596605,42.9918065]}},{"type":"Feature","properties":{"resourceCoords":[-3.0,1870.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6621879,42.9918409]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p904 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.21"},{"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":"6660.0"},{"label":"split_canvas_h","value":"4058.4"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"222.1,103.8 65.1,250.7 41.0,867.5 99.2,975.1 485.3,998.6 542.9,912.1 547.1,905.2 547.4,905.4 547.9,904.6 718.9,1005.8 1054.7,980.1 1238.5,707.3 1338.2,667.8 1397.8,721.0 1371.1,770.0 1453.3,783.5 1404.5,679.9 1478.9,635.0 1543.1,448.1 1420.4,158.5 1192.4,49.2 568.7,27.7 222.1,103.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0904__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[502.0,88.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6585464,43.022116]}},{"type":"Feature","properties":{"resourceCoords":[580.0,315.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6591678,43.022138]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0905/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p905","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0905/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0905","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1514.0,1901.4 1090.0,1891.0 779.8,1889.4 781.9,1833.5 136.4,1810.9 86.0,1132.1 112.2,135.4 824.2,243.0 825.3,205.2 1090.8,231.4 1090.8,220.2 1615.8,315.5 1615.0,470.4 1606.7,944.7 1597.5,944.4 1582.8,1422.0 1587.3,1422.1 1600.5,1902.8 1514.0,1901.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0905/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1090.0,1891.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.669681,42.994601]}},{"type":"Feature","properties":{"resourceCoords":[1090.0,458.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6697176,42.9973316]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0906/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p906","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0906/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0906","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"462.4,1904.9 101.0,1905.8 78.1,1411.0 73.4,1410.9 79.2,918.8 88.6,918.9 88.0,430.3 85.7,270.8 488.6,336.1 486.1,214.9 1560.7,284.8 1561.5,394.7 1561.8,435.0 1579.2,1903.7 462.4,1904.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0906/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[495.0,920.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.667331272326,42.99640488634385]}},{"type":"Feature","properties":{"resourceCoords":[1562.0,1403.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6646438289359,42.99549307988985]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0907/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p907","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0907/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0907","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"121.0,252.0 161.9,242.0 1094.9,267.2 1095.4,191.1 1664.0,252.7 1664.0,773.9 1646.8,773.5 1597.5,1261.6 1610.3,1751.8 1128.6,1741.5 108.7,1720.6 121.0,252.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0907/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1094.0,760.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6621463,42.9963638]}},{"type":"Feature","properties":{"resourceCoords":[121.0,252.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6646217,42.9972838]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0908__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p908 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"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":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0908__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0908","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"213.6,1766.8 213.5,1796.2 450.8,1785.1 664.0,1490.2 796.6,1445.8 862.4,1077.4 1248.5,360.8 1232.7,359.8 1277.2,282.0 1110.8,196.6 1005.2,184.4 576.0,184.0 575.9,196.9 162.8,90.8 182.3,251.0 188.8,777.6 171.4,777.4 127.6,1271.2 146.7,1766.2 213.6,1766.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0908__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[576.0,184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6597326,42.9974358]}},{"type":"Feature","properties":{"resourceCoords":[576.0,1278.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6597362,42.9954324]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0909/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p909","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0909/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0909","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.5,1810.8 86.4,1394.9 92.2,903.1 115.7,153.2 116.1,141.3 638.9,144.6 638.6,151.9 1110.2,112.4 1110.8,86.2 1379.1,237.1 1582.3,337.2 1566.7,916.5 1519.8,915.2 1618.6,1868.4 1050.0,1800.6 1048.8,1876.7 116.5,1841.6 75.5,1851.1 76.5,1810.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0909/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[638.0,-169.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.66330950775486,43.00104458801899]}},{"type":"Feature","properties":{"resourceCoords":[1578.0,888.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.66087296496056,42.99912643519197]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0911/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p911","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0911/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0911","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1581.0,1896.0 1040.5,1860.4 1041.7,1921.4 566.2,1843.9 566.3,1849.7 428.5,1838.7 428.3,1858.3 58.4,1809.2 70.4,326.6 130.8,95.0 248.2,101.3 255.9,145.2 326.1,203.3 480.1,202.1 508.9,128.4 629.8,112.8 728.2,42.2 1571.8,46.1 1635.4,192.3 1631.0,343.0 1582.5,493.4 1576.9,493.4 1572.8,623.4 1576.0,881.2 1575.9,1116.9 1575.5,1494.4 1580.0,1742.0 1581.0,1896.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0911/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1303.0,1472.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6660007,42.9991297]}},{"type":"Feature","properties":{"resourceCoords":[1576.0,389.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.664582,43.003104]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0912/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p912","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0912/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0912","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1390.8,1648.0 1395.4,1768.6 1093.1,1740.7 956.9,1723.8 623.5,1733.9 412.2,1745.8 455.6,1587.6 563.2,967.7 184.4,762.1 163.2,750.6 424.6,277.6 480.7,306.8 528.1,331.4 536.1,335.5 810.9,478.3 827.9,416.9 1365.3,643.0 1366.2,668.9 1401.5,666.1 1405.4,788.8 1539.2,858.4 1415.8,1113.2 1434.5,1694.0 1390.8,1648.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0912/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1364.0,605.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6533862,43.0026309]}},{"type":"Feature","properties":{"resourceCoords":[140.0,738.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.653619,43.004917]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0913/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p913","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0913/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0913","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"353.3,1903.9 364.5,1873.2 1461.4,1885.8 1517.7,1917.6 1603.5,1918.8 1610.0,1496.0 1612.4,977.2 1596.0,977.1 1550.9,1.0 1427.2,1.0 1353.7,131.8 1104.1,1.0 518.4,1.0 89.7,382.0 246.7,382.9 221.1,748.8 246.4,749.0 237.6,1400.1 226.2,1403.7 219.1,1406.0 321.7,1904.6 353.3,1903.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0913/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1355.0,145.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.654042719101,43.002296449731084]}},{"type":"Feature","properties":{"resourceCoords":[353.0,1870.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.65659468460119,42.99909666803764]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p914 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4000.8"},{"label":"split_canvas_w","value":"3113.6"},{"label":"split_canvas_h","value":"4071.2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"116.2,1750.0 380.8,1745.7 380.7,1749.4 618.8,1724.0 618.8,1710.7 619.1,1693.3 621.0,1549.6 622.0,1470.1 556.3,1134.5 516.6,1133.7 509.5,1133.7 405.1,1133.6 305.5,1131.1 296.7,1044.8 175.9,1022.9 169.0,1004.6 127.7,1129.7 121.9,1129.7 116.8,1260.2 118.1,1519.3 116.2,1750.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[624.3,1141.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6620692875503,43.002676386956786]}},{"type":"Feature","properties":{"resourceCoords":[119.0,1141.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.66459643339286,43.00267788241639]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p914 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.86"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"8072.0"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"790.6,1820.6 871.0,1864.3 1064.3,1868.0 1239.6,1864.9 1532.0,1804.7 1527.1,1349.0 1536.3,1349.0 1568.8,896.5 1571.7,896.5 1577.3,728.0 1514.4,210.1 1515.6,210.1 1514.7,126.2 1159.2,132.5 1142.5,118.4 1049.8,92.7 581.8,87.1 492.9,120.9 328.4,123.8 324.8,103.0 270.2,376.4 266.5,378.8 344.2,401.4 649.5,459.6 668.6,425.8 754.1,274.1 760.0,263.7 991.5,396.6 976.6,424.1 962.0,451.2 889.3,585.7 919.5,594.6 803.5,858.2 790.7,858.4 821.8,1356.8 829.9,1356.7 832.7,1612.2 832.9,1820.5 790.6,1820.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0914__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[746.0,849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6537786,43.0026695]}},{"type":"Feature","properties":{"resourceCoords":[217.0,1823.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6565941,42.9990337]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0915/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p915","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"19"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0915/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0915","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"502.4,1694.3 366.7,1622.4 366.9,1605.2 369.1,1385.0 303.4,1054.0 264.3,1053.3 154.3,1053.5 56.1,1051.3 47.2,966.2 88.1,973.5 119.4,595.2 250.3,587.4 304.7,554.5 333.6,503.5 332.9,310.8 587.5,324.4 586.7,106.2 673.8,51.3 1557.5,99.0 1587.7,292.2 1528.3,569.3 1524.5,571.6 1527.2,677.8 1527.2,845.2 1516.7,913.2 1498.1,1064.5 1558.7,1064.0 1320.1,1276.8 1398.7,1277.1 1386.2,1460.3 1398.9,1460.4 1395.1,1786.3 1389.5,1788.1 1375.7,1792.5 1144.1,1826.0 1018.9,1838.0 949.6,1834.7 844.0,1817.0 769.0,1800.3 677.8,1771.6 605.0,1741.7 502.4,1694.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0915/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[844.0,1062.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6596676,43.002664]}},{"type":"Feature","properties":{"resourceCoords":[844.0,1817.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6596816,42.9998632]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0916/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p916","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0916/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0916","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1664.0,741.0 1587.8,697.2 1503.7,860.2 1491.6,963.8 1490.6,1384.7 1503.2,1384.8 1398.6,1789.7 613.4,1888.2 613.6,1841.8 39.3,1838.7 99.2,1694.4 157.1,1513.5 190.7,1364.5 226.7,1154.7 233.7,1017.2 210.8,768.4 146.2,308.1 139.8,287.8 635.7,186.8 635.1,155.3 635.0,148.6 850.3,180.3 1160.9,115.3 1507.7,129.8 1565.4,671.6 1664.0,724.9 1664.0,741.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0916/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[625.0,814.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6582759,42.9990524]}},{"type":"Feature","properties":{"resourceCoords":[1066.0,1385.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6597336,42.9982287]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0917/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p917","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0917/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0917","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"120.5,1866.9 222.9,1844.9 849.4,1895.0 1597.4,1809.5 1581.7,59.2 345.4,32.3 185.0,87.9 187.2,1.0 181.2,1.0 121.9,930.5 103.0,930.7 120.5,1866.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0917/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[128.0,930.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.64973595066579,43.000732520996195]}},{"type":"Feature","properties":{"resourceCoords":[1585.0,1843.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.64614142259282,42.998989205575505]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0918/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p918","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0918/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0918","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"65.5,1761.5 44.2,1385.0 118.6,643.1 74.9,562.6 42.5,303.1 64.5,222.7 166.8,226.5 210.5,321.6 342.1,321.9 360.4,259.7 481.1,201.5 572.7,70.0 645.9,40.9 1347.5,34.8 1599.6,79.1 1631.4,704.2 1614.8,1804.4 1552.6,1862.8 1497.9,1833.4 1198.2,1825.6 1106.9,1829.1 920.4,1898.2 523.2,1890.2 524.0,1804.4 160.8,1803.8 144.1,1789.2 50.0,1761.0 65.5,1761.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0918/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[239.0,1010.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.65119626380057,43.00827280963789]}},{"type":"Feature","properties":{"resourceCoords":[684.0,1180.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.64894886689868,43.0076482402271]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0919/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p919","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.67"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0919/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0919","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1534.3,1587.9 1223.4,1603.0 1146.8,1811.0 436.6,1911.6 93.0,1759.9 148.3,850.8 112.3,156.4 482.1,92.0 1547.6,273.3 1534.3,1587.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0919/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.64028260509241,42.97287046833992]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.6360337677486,42.97293586057714]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.63592545025003,42.96916785508267]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.64017428759384,42.96910246284545]}},{"type":"Feature","properties":{"resourceCoords":[189.0,1552.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.639717,42.96998]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p920 [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":"4003.6"},{"label":"split_canvas_w","value":"6660.0"},{"label":"split_canvas_h","value":"4068.4"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"99.5,1905.0 145.0,1858.9 1255.8,1908.4 1548.9,1827.7 1633.7,1877.7 1620.5,1001.5 1618.4,1001.5 1614.1,1001.6 1615.5,1097.2 1486.5,1090.9 1416.5,1334.8 950.5,1273.6 899.3,1130.8 612.0,1025.4 82.7,1072.0 99.5,1905.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1623.0,1883.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.63379962777799,42.962762155563226]}},{"type":"Feature","properties":{"resourceCoords":[109.0,1883.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.63769558191046,42.96278194650165]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p920 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.89"},{"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":"6660.0"},{"label":"split_canvas_h","value":"4097.6"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1468.5,985.9 1462.5,138.4 1360.6,50.5 996.3,113.8 632.6,82.5 486.7,147.1 86.7,108.3 61.1,727.0 81.6,952.8 183.2,1004.4 1394.5,1004.7 1422.4,1004.3 1468.5,985.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0920__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1080.0,438.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6387128,42.9637514]}},{"type":"Feature","properties":{"resourceCoords":[95.0,973.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6411996,42.9627487]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0922/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p922","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0922/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0922","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"91.3,51.5 1490.5,26.6 1577.5,78.3 1612.0,319.0 1621.6,1812.7 1562.9,1863.2 834.0,1893.7 156.4,1888.1 96.9,1851.8 97.0,959.7 90.5,959.7 91.3,51.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0922/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1150.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.63110773833026,42.962793276694214]}},{"type":"Feature","properties":{"resourceCoords":[124.0,1849.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-85.6337035869541,42.962777716590125]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0923/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Grand Rapids, Michigan | 1952 | sanborn04023_021 p923","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-18T18:46:54Z","modified":"2026-10-18T18:46:54Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0923/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0923","type":"ImageService3","width":1665,"height":2018},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"155.9,1865.6 79.8,1595.4 46.3,994.9 47.4,792.9 116.5,701.9 66.9,671.0 99.5,585.7 69.4,432.9 118.5,124.5 98.8,73.2 172.2,54.5 263.0,144.9 489.7,110.9 771.0,165.8 1284.0,64.1 1537.4,89.0 1588.3,264.3 1584.8,704.5 1532.8,731.2 1526.3,889.8 1599.0,1066.0 1566.7,1851.4 1171.6,1914.6 400.9,1919.0 155.9,1865.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd411m:g4114m:g4114gm:g04023195205:04023_09_1952-0923/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.62786773983417,42.9732328105455]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.62364485249996,42.97336071799312]}},{"type":"Feature","properties":{"resourceCoords":[1665.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.62343446533816,42.96958934105826]}},{"type":"Feature","properties":{"resourceCoords":[0.0,2018.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-85.62765735267237,42.96946143361064]}}]}}]}