{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn07439_021.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Portland, Oregon | 1950 | mapsnap generated fit (2026-10-24)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-24"},{"label":"run","value":"corpus-v2.2"},{"label":"pages","value":"151"},{"label":"placed","value":"87"},{"label":"unplaced","value":"64"},{"label":"fit sources","value":"georef 58, georef-snap 25, georef-street 2, snap:0 2"},{"label":"key map","value":"georeferenced"},{"label":"split sheets","value":"23 sheet(s) cut into 65 panels"},{"label":"unplaced pages","value":"p10 (tier 1, 45.54060,-122.69200 +/-248m); p14 (tier 1, 45.52644,-122.69612 +/-261m); p1__2 (tier 1, 45.53525,-122.69241 +/-100m); p1__3 (tier 1, 45.52610,-122.69175 +/-100m); p1__4 (tier 1, 45.53103,-122.69686 +/-100m); p20__1 (tier 1, 45.53589,-122.68419 +/-280m); p20__2 (tier 1, 45.53538,-122.68601 +/-147m); p2__1 (tier 1, 45.53119,-122.69878 +/-267m); p2__2 (tier 1, 45.53043,-122.69825 +/-101m); p30__1 (tier 1, 45.55432,-122.73329 +/-100m); p30__2 (tier 1, 45.55366,-122.73257 +/-100m); p30__3 (tier 1, 45.55365,-122.73173 +/-100m); p30__4 (tier 1, 45.55511,-122.73310 +/-100m); p30__6 (tier 1, 45.55502,-122.73333 +/-100m); p38 (tier 1, 45.53017,-122.67787 +/-125m); p3__1 (tier 1, 45.54069,-122.69601 +/-100m); p3__2 (tier 1, 45.54180,-122.69914 +/-262m); p48 (tier 1, 45.53159,-122.70582 +/-230m); p49__1 (tier 1, 45.52841,-122.70612 +/-100m); p4__1 (tier 1, 45.52247,-122.67167 +/-239m); p4__2 (tier 1, 45.54181,-122.71063 +/-100m); p4__3 (tier 2, 45.53351,-122.69645 +/-1653m); p62 (tier 1, 45.52612,-122.67157 +/-262m); p77 (tier 1, 45.52297,-122.68226 +/-267m); p85 (tier 1, 45.52081,-122.67361 +/-260m); p86__2 (tier 4, 45.53066,-122.69335 +/-5662m); p87__1 (tier 1, 45.52385,-122.67615 +/-257m); p87__2 (tier 4, 45.53066,-122.69335 +/-5662m); p88__1 (tier 3, 45.54017,-122.74720 +/-511m); p88__2 (tier 3, 45.54017,-122.74720 +/-511m); p88__3 (tier 1, 45.54124,-122.74617 +/-135m); p89 (tier 3, 45.54908,-122.71986 +/-100m); p8__2 (tier 2, 45.53855,-122.69250 +/-100m); p90 (tier 3, 45.53862,-122.74346 +/-511m); p91__1 (tier 3, 45.52844,-122.70832 +/-511m); p91__2 (tier 1, 45.52755,-122.70707 +/-184m); p91__3 (tier 1, 45.52755,-122.70708 +/-170m); p92__1 (tier 3, 45.55026,-122.74863 +/-511m); p92__2 (tier 3, 45.55026,-122.74863 +/-511m); p93 (tier 3, 45.53556,-122.74152 +/-511m); p94__1 (tier 1, 45.52342,-122.69970 +/-188m); p94__2 (tier 1, 45.52474,-122.69687 +/-183m); p94__3 (tier 1, 45.52326,-122.69636 +/-183m); p95 (tier 4, 45.53066,-122.69335 +/-5662m); p96__1 (tier 3, 45.51947,-122.72498 +/-511m); p96__2 (tier 1, 45.52060,-122.72650 +/-116m); p97__1 (tier 3, 45.50814,-122.71237 +/-511m); p97__3 (tier 3, 45.50814,-122.71237 +/-511m); p98__2 (tier 1, 45.54085,-122.72289 +/-100m); p99D__1 (tier 3, 45.50534,-122.70913 +/-511m); p99E (tier 2, 45.54165,-122.70303 +/-100m); p99F (tier 1, 45.54096,-122.71728 +/-250m); p99G__1 (tier 2, 45.55449,-122.73310 +/-100m); p99G__2 (tier 1, 45.52503,-122.71028 +/-100m); p99G__3 (tier 1, 45.50305,-122.70920 +/-100m); p99G__4 (tier 1, 45.55179,-122.72692 +/-100m); p99G__5 (tier 1, 45.52632,-122.71188 +/-100m); p99H__2 (tier 2, 45.52902,-122.70949 +/-644m); p99J__1 (tier 1, 45.55291,-122.72861 +/-192m); p99J__3 (tier 1, 45.55296,-122.72792 +/-100m); p99__1 (tier 1, 45.54269,-122.71910 +/-121m); p99__3 (tier 1, 45.54353,-122.71911 +/-100m); p99__4 (tier 1, 45.53040,-122.71692 +/-103m); p99__5 (tier 1, 45.53815,-122.71767 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p11","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0011/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0011","type":"ImageService3","width":1630,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"260.7,1880.5 260.6,1873.2 124.2,1866.0 124.5,1855.3 51.9,1853.5 46.9,1758.9 52.7,804.4 89.0,804.0 92.0,785.0 91.0,758.0 53.0,756.3 54.0,593.1 78.7,593.7 145.2,371.3 132.3,355.6 167.8,23.5 197.5,23.8 197.7,69.6 1069.8,54.8 1177.5,108.3 1200.7,50.8 1404.6,34.0 1479.2,71.7 1479.3,138.6 1510.8,147.4 1542.6,719.2 1534.4,719.2 1577.5,1103.7 1564.0,1103.8 1585.7,1493.0 1608.2,1493.6 1609.8,1717.6 1073.2,1877.2 863.1,1877.3 260.7,1880.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1499.0,719.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7150296,45.5373486]}},{"type":"Feature","properties":{"resourceCoords":[1120.0,1107.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7160087,45.5366109]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p12","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0012/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0012","type":"ImageService3","width":1609,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"128.6,1574.3 341.5,1564.7 974.3,1744.2 1202.1,1810.2 1463.4,1889.3 1522.0,1500.0 1526.0,1500.4 1520.7,1216.4 1522.2,729.9 1511.7,729.8 1500.7,139.4 1473.1,145.2 1270.5,177.7 1123.5,190.5 562.7,215.7 463.6,215.2 467.8,137.0 62.1,106.5 1.0,75.6 1.0,142.8 31.7,151.5 63.1,727.5 54.8,727.5 97.8,1114.8 84.2,1115.0 105.5,1507.0 128.2,1507.7 128.6,1574.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1522.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.711023,45.5359962]}},{"type":"Feature","properties":{"resourceCoords":[1522.0,135.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.711116,45.5385117]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0013/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0013","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1317.5,1856.9 1155.2,1854.9 1123.5,1854.5 334.8,1849.6 238.6,1845.2 228.9,1842.2 291.8,1451.2 295.8,1451.5 293.4,1165.9 300.0,676.7 289.4,676.5 284.5,82.7 306.0,78.4 571.5,28.3 1446.8,123.2 1618.0,441.6 1618.0,1685.2 1317.5,1856.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0013/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[303.0,1450.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7109938873142,45.53599912941903]}},{"type":"Feature","properties":{"resourceCoords":[303.0,685.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.71106635209462,45.53740039825518]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0015/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p15","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0015/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0015","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1572.7,1745.3 1607.6,1028.0 1604.6,991.0 1554.8,989.2 1554.9,958.3 1586.1,959.0 1583.2,901.5 1586.3,586.1 1587.0,328.4 821.0,264.8 821.0,284.5 759.5,276.2 535.7,20.9 490.3,20.5 457.2,20.1 443.4,115.8 82.3,291.9 82.3,304.3 9.3,377.8 10.0,446.0 1.0,446.9 1.0,472.1 11.0,473.0 11.0,524.0 1.0,524.9 1.0,562.1 11.0,563.0 11.0,584.0 1.0,584.9 1.0,617.1 12.0,618.0 12.0,638.0 1.0,638.9 1.0,665.1 12.0,666.0 12.0,699.0 1.0,699.9 1.0,726.0 12.0,726.0 13.0,751.0 26.0,752.0 24.0,797.0 1.0,798.0 1.0,818.1 12.0,819.0 13.0,832.0 12.0,863.0 1.0,863.9 1.0,1607.7 71.7,1675.0 71.6,1693.7 71.2,1732.1 821.6,1739.8 1572.7,1745.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0015/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[93.0,577.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70488327055469,45.53752677441838]}},{"type":"Feature","properties":{"resourceCoords":[93.0,1726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70477816223098,45.53539865325905]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p16","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0016/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0016","type":"ImageService3","width":1611,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"19.6,1736.9 402.9,1736.8 1254.2,1744.1 1554.5,1746.1 1551.3,995.2 1530.0,996.0 1528.0,953.0 1551.1,950.7 1549.5,586.4 1569.3,586.8 1572.4,200.3 1210.2,197.2 1181.6,178.9 798.9,182.1 798.8,198.8 554.0,195.4 30.8,188.6 30.7,572.9 28.3,889.6 31.3,947.3 1.0,946.7 1.0,977.8 50.0,979.5 53.0,1016.5 19.6,1736.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[792.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6988949,45.5369185]}},{"type":"Feature","properties":{"resourceCoords":[792.0,1740.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6988293,45.535498]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p17","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0017/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0017","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1594.2,1782.8 1434.0,1744.7 1255.1,1738.0 453.0,1744.8 65.8,1744.5 57.2,1744.5 43.0,592.0 62.6,592.2 62.6,208.0 453.6,202.5 828.2,205.5 828.1,185.1 1592.7,203.3 1594.0,485.8 1594.3,972.9 1592.9,1260.8 1618.0,1432.1 1618.0,1462.5 1618.0,1591.3 1595.2,1731.5 1594.2,1782.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[828.0,591.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6948518,45.5377086]}},{"type":"Feature","properties":{"resourceCoords":[828.0,1742.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6947776,45.5355718]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p18","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"14"},{"label":"confidence","value":"0.75"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0018/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0018","type":"ImageService3","width":1611,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"99.1,151.2 551.2,96.9 924.5,194.1 1028.8,106.6 1400.4,96.7 1490.1,158.3 1549.7,429.6 1506.6,428.9 1529.2,1348.2 1572.9,1349.5 1564.2,1721.6 1223.0,1713.0 1031.5,1707.3 853.8,1716.1 813.1,1723.9 813.8,1694.8 61.3,1696.1 62.3,1675.7 88.2,1538.8 92.2,1382.6 71.9,1213.9 80.6,931.5 92.7,453.6 99.1,151.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1186.0,1338.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6897584,45.5363708]}},{"type":"Feature","properties":{"resourceCoords":[60.0,1726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6927442,45.5355306]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p19","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.51"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0019/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0019","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1300.2,1153.8 1200.6,1257.1 1212.9,1307.6 1248.5,1369.5 1178.1,1324.8 1124.5,1313.5 1086.1,1349.1 1017.0,1363.7 1015.2,1526.2 623.0,1554.1 622.2,1615.0 233.3,1397.4 233.9,1354.8 236.8,971.4 191.4,970.8 152.8,24.0 197.5,24.0 208.8,71.4 584.8,113.8 593.9,62.7 927.8,37.5 1209.9,223.6 1379.4,244.2 1550.0,661.6 1457.8,974.4 1462.5,1149.9 1300.2,1153.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0019/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.68941635299794,45.53815379092304]}},{"type":"Feature","properties":{"resourceCoords":[1608.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.6852319385824,45.538255745152554]}},{"type":"Feature","properties":{"resourceCoords":[1608.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.68505935735388,45.53473141367381]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.68924377176941,45.5346294594443]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0001__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p1 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.79"},{"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":"6460.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0001__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0001","type":"ImageService3","width":1615,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"353.4,1853.2 647.8,1816.0 797.1,1828.4 936.9,1873.0 1180.8,1838.7 1260.2,1599.3 1305.8,1578.8 1311.1,1559.3 1344.9,1561.2 1452.5,1512.6 1481.8,1471.4 1568.0,1105.4 1544.9,417.8 1487.8,256.1 1443.5,264.1 1379.6,113.5 1286.0,91.9 1043.3,137.6 816.3,76.6 594.1,97.1 117.2,57.1 53.6,305.1 55.6,663.2 117.8,738.9 328.6,788.0 330.4,788.0 330.4,788.4 345.1,791.9 378.1,864.8 379.2,999.9 287.6,1053.2 257.9,1553.2 122.3,1606.4 109.8,1675.9 151.9,1804.5 353.4,1853.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0001__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[464.0,625.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.71088376307436,45.54659744010365]}},{"type":"Feature","properties":{"resourceCoords":[464.0,1656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7059065968407,45.54502399007444]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p21 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"5559.2"},{"label":"split_canvas_w","value":"4132.0"},{"label":"split_canvas_h","value":"2120.8"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"64.9,1458.1 51.6,1892.6 937.5,1876.3 960.8,1875.5 962.3,1474.7 809.0,1473.9 202.3,1473.5 202.3,1466.1 64.9,1458.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[200.0,1473.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.71824153277153,45.53513497380741]}},{"type":"Feature","properties":{"resourceCoords":[200.0,1864.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.71821004708544,45.53441421952734]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p21 [2]","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.95"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6432.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"56.0,748.0 58.8,1117.5 126.2,1319.5 563.0,1311.4 730.8,1383.4 1041.2,1393.5 1110.8,1528.9 1109.1,1810.0 1190.4,1812.6 1210.2,1887.2 1414.2,1897.7 1557.0,204.5 1541.6,199.9 903.4,14.4 721.0,23.0 688.1,22.8 688.0,183.4 140.5,341.7 81.8,341.4 79.5,747.2 56.0,748.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0021__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1250.0,1877.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7130653,45.5324451]}},{"type":"Feature","properties":{"resourceCoords":[466.0,344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.715235,45.535194]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p22","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0022/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0022","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"51.1,1874.0 182.2,196.6 394.9,258.3 666.1,340.5 761.9,343.9 1546.5,340.9 1542.2,720.8 1541.5,1027.6 1545.3,1782.8 1571.4,1805.8 1605.1,1836.7 1605.0,1839.0 1316.4,1867.5 1272.6,1843.0 1232.2,1875.9 895.0,1909.3 875.8,1909.0 808.8,1860.6 760.0,1885.9 562.9,1887.5 520.1,1895.1 51.1,1874.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[710.0,1110.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7109566,45.5338559]}},{"type":"Feature","properties":{"resourceCoords":[710.0,726.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.710983,45.5345631]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p23","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0023/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0023","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"105.0,1666.5 138.7,1699.4 205.1,1757.4 210.2,1761.8 1568.2,1762.8 1550.8,583.8 1581.9,583.8 1580.1,198.2 1580.0,159.6 1579.8,140.8 1507.0,73.4 1506.0,1.0 1261.9,1.0 1261.0,9.0 1176.0,14.0 981.0,12.0 720.0,24.0 561.6,23.0 561.7,30.2 265.4,205.5 104.2,206.0 72.8,206.1 70.4,584.9 71.2,890.8 78.8,1643.7 105.0,1666.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[82.0,977.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7087428463068,45.53388887443534]}},{"type":"Feature","properties":{"resourceCoords":[82.0,591.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70876429049197,45.53460194898158]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p24","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0024/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0024","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"744.9,1731.2 5.2,1665.7 1.4,573.9 32.4,574.2 35.0,191.0 783.0,197.1 1531.6,201.1 1530.4,582.5 1521.5,1731.6 1317.0,1731.5 744.9,1731.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1525.0,1348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7007826,45.5333258]}},{"type":"Feature","properties":{"resourceCoords":[35.0,191.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7048352,45.535386]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p25","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0025/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0025","type":"ImageService3","width":1614,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"55.8,579.7 54.9,196.1 437.6,193.9 1287.5,196.6 1595.9,196.9 1592.4,1350.7 1594.9,1740.2 792.1,1736.9 53.3,1735.3 55.8,579.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[826.0,1737.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69872,45.532648]}},{"type":"Feature","properties":{"resourceCoords":[826.0,195.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6988293,45.535498]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p26","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0026/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0026","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"943.9,1748.1 786.1,1746.6 18.6,1750.8 16.7,1361.0 21.9,206.5 411.1,208.3 1217.3,204.7 1397.1,212.1 1558.0,251.1 1555.5,981.0 1557.8,1320.8 1553.9,1747.4 943.9,1748.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[788.0,979.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69472,45.534146]}},{"type":"Feature","properties":{"resourceCoords":[788.0,207.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6947776,45.5355718]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p27","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0027/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0027","type":"ImageService3","width":1614,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"74.3,217.8 850.9,196.2 850.9,226.2 892.7,217.1 1075.9,203.2 1273.5,204.0 1613.0,203.6 1613.0,1756.3 1594.6,1756.2 1228.4,1754.5 851.7,1757.3 76.0,1756.7 78.2,1326.8 74.4,984.3 73.8,248.7 74.3,217.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0027/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1230.0,1372.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6896483,45.5335229]}},{"type":"Feature","properties":{"resourceCoords":[1230.0,204.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6897219,45.5356635]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p28","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0028/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0028","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"44.6,193.4 1.0,1426.1 1.0,1707.8 4.5,1708.0 386.7,1718.1 758.4,1732.3 1136.5,1750.9 1518.4,1761.5 1527.4,1344.5 1539.6,1002.4 1557.9,621.9 1531.2,621.3 1527.7,244.4 1426.8,149.5 1430.1,71.3 1254.6,88.8 1254.5,23.0 1097.0,23.0 997.8,121.5 1008.5,171.2 1041.5,232.5 974.3,187.1 922.5,174.8 884.4,208.7 817.0,221.3 811.3,380.0 430.0,397.9 427.7,457.4 55.7,235.4 57.2,193.9 44.6,193.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[404.0,962.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6876351,45.5342797]}},{"type":"Feature","properties":{"resourceCoords":[43.0,573.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6886637,45.534969]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p29","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.83"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0029/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0029","type":"ImageService3","width":1614,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"160.8,1736.3 927.0,1733.8 926.5,1680.3 1238.1,1747.8 1548.4,1519.3 1543.5,1517.9 1557.2,746.8 1457.0,242.8 1282.5,239.7 1269.7,137.6 1029.7,133.3 842.3,28.1 347.4,33.8 149.7,103.1 1.0,28.9 1.0,108.7 106.2,199.7 125.7,581.2 152.7,580.6 150.2,966.7 150.9,1076.2 152.3,1313.6 160.8,1736.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[544.0,1348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.683528,45.5336369]}},{"type":"Feature","properties":{"resourceCoords":[544.0,1736.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6835097,45.5329177]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__5/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p30 [5]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.67"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4696.8"},{"label":"split_canvas_y","value":"1611.6"},{"label":"split_canvas_w","value":"1771.2"},{"label":"split_canvas_h","value":"4097.2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__5/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1487.8,1025.4 1465.0,1024.5 1475.9,445.1 1304.6,426.6 1364.4,913.1 1202.0,956.5 1202.4,1177.5 1533.5,1353.2 1535.2,1379.5 1544.7,1384.9 1466.1,1028.9 1487.8,1025.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__5/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1174.2,402.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73370278737309,45.554525244562626]}},{"type":"Feature","properties":{"resourceCoords":[1617.0,402.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73324249042354,45.5547696103646]}},{"type":"Feature","properties":{"resourceCoords":[1617.0,1427.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73244069280054,45.55401858597891]}},{"type":"Feature","properties":{"resourceCoords":[1174.2,1427.2],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73290098975009,45.55377422017693]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__7/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p30 [7]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.59"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"4956.4"},{"label":"split_canvas_w","value":"1676.8"},{"label":"split_canvas_h","value":"2723.6"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__7/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"87.2,1600.4 78.9,1593.8 58.5,1834.7 387.9,1777.9 391.7,1284.6 85.3,1241.8 63.5,1242.0 87.2,1600.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0030__7/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,1239.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73297075688052,45.55418689017522]}},{"type":"Feature","properties":{"resourceCoords":[419.2,1239.1],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.732583863321,45.554465907038335]}},{"type":"Feature","properties":{"resourceCoords":[419.2,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73194077927135,45.55402248181649]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.73232767283088,45.55374346495337]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0031/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p31","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0031/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0031","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"889.3,1745.7 455.2,1741.2 214.4,1744.5 173.6,1737.0 128.6,1684.2 113.7,1666.8 91.1,1640.3 75.0,128.1 827.7,189.3 1409.5,185.4 1599.0,184.2 1599.0,1313.8 1599.0,1745.0 1583.0,1744.7 889.3,1745.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0031/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[91.0,969.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7046899,45.5311075]}},{"type":"Feature","properties":{"resourceCoords":[91.0,579.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7047156,45.5318203]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p32","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0032/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0032","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"771.0,188.9 1577.9,191.3 1576.8,1313.0 1581.6,1403.0 1544.0,1406.0 1545.0,1453.0 1581.7,1451.2 1580.5,1741.0 1544.4,1741.0 30.2,1740.2 9.1,1739.7 9.9,188.3 28.2,188.2 771.0,188.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[805.0,1352.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6986414,45.5305095]}},{"type":"Feature","properties":{"resourceCoords":[805.0,189.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69872,45.532648]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p33","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0033/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0033","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"816.0,197.0 971.5,198.3 1572.7,196.8 1571.1,582.3 1575.0,1006.6 1576.3,1344.3 1572.6,1725.0 60.4,1722.8 61.8,1438.4 25.9,1440.2 24.9,1394.0 61.9,1391.2 57.3,1302.9 59.5,202.3 816.0,197.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[816.0,1344.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6945853,45.5305788]}},{"type":"Feature","properties":{"resourceCoords":[816.0,197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6946677,45.5327283]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p34","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0034/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0034","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"23.5,1355.3 23.1,1013.3 20.4,583.4 23.2,192.7 791.8,197.7 1165.0,197.0 1527.8,200.8 1547.0,201.0 1548.9,26.4 1550.0,26.3 1555.2,201.1 1559.8,201.1 1558.1,930.0 1558.2,1360.8 1555.6,1747.9 1514.8,1747.7 18.5,1741.1 23.5,1355.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[786.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6905679,45.5313639]}},{"type":"Feature","properties":{"resourceCoords":[1165.0,197.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6896284,45.5328219]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0035/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p35","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0035/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0035","type":"ImageService3","width":1598,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"250.4,1352.7 251.4,920.1 254.9,188.3 644.8,188.1 1024.0,192.3 1409.8,200.8 1411.7,587.2 1403.5,1749.4 246.8,1741.3 250.4,1352.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0035/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1014.0,970.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6865235,45.5314414]}},{"type":"Feature","properties":{"resourceCoords":[634.0,1744.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6874568,45.5299931]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0036/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p36","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"16"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0036/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0036","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"401.9,208.7 1164.3,193.2 1162.9,139.8 1474.1,201.7 1439.2,228.3 1500.2,565.9 1564.2,564.5 1573.2,905.1 1564.6,946.7 1583.9,1724.3 1267.0,1725.2 440.1,1745.6 59.0,1752.0 30.6,602.7 16.6,220.7 401.9,208.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0036/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[803.0,967.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6834559,45.5314923]}},{"type":"Feature","properties":{"resourceCoords":[59.0,1752.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6854332,45.5300291]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0037/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p37","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.84"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0037/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0037","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1475.5,1828.5 1415.8,1756.3 625.7,1801.0 273.0,1802.0 242.1,1813.3 138.0,1811.8 138.0,1023.0 147.8,981.0 147.3,635.5 82.3,635.3 29.1,291.6 380.0,37.2 623.0,108.2 896.9,27.0 1271.0,43.9 1474.9,115.2 1545.3,234.6 1583.8,1568.6 1489.8,1846.8 1475.5,1828.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0037/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[138.0,1023.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6814307,45.5315309]}},{"type":"Feature","properties":{"resourceCoords":[138.0,1768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6813809,45.5301628]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p39","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0039/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0039","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1413.4,111.7 1437.7,645.0 1499.9,602.7 1239.2,1919.0 1164.0,1919.0 1163.0,1910.0 1100.0,1905.0 898.0,1909.0 786.0,1902.0 633.0,1900.0 522.0,1907.0 516.6,1906.8 197.7,1622.0 203.8,1616.7 256.0,1571.0 263.1,1530.1 256.9,1289.3 256.1,855.2 246.5,161.5 246.8,124.3 635.1,117.5 1297.3,112.2 1413.4,111.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0039/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[256.0,894.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7026571,45.5297239]}},{"type":"Feature","properties":{"resourceCoords":[256.0,1571.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7044237,45.5297077]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p40","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.81"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0040/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0040","type":"ImageService3","width":1627,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"597.8,1777.3 518.3,1786.1 462.1,1831.8 454.2,1843.3 352.4,1890.0 328.6,1907.2 176.8,1903.2 173.0,1903.0 24.1,1909.7 275.6,616.2 214.1,658.5 193.2,216.6 188.9,127.3 195.9,127.2 342.0,125.7 342.9,183.4 1351.7,91.5 1417.4,48.9 1439.3,73.0 1578.5,527.2 1545.6,557.5 1557.0,616.3 1604.9,635.3 1605.0,638.0 1612.6,638.4 1617.8,655.1 1611.0,656.0 1608.2,673.4 1543.5,670.6 1505.0,861.4 1554.8,979.5 1612.0,981.8 1469.4,1084.5 1446.7,1112.9 1443.9,1331.2 1461.0,1411.0 851.9,1778.9 874.5,1663.0 912.7,1538.4 773.9,1616.8 753.7,1637.2 732.7,1715.4 597.8,1777.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0040/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70024807434189,45.52797864525006]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70020184573646,45.52497186874498]}},{"type":"Feature","properties":{"resourceCoords":[1627.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70523108056004,45.524933379678494]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70527730916547,45.527940156183575]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p41","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0041/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0041","type":"ImageService3","width":1617,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"76.8,1364.6 77.8,1242.7 80.8,586.9 79.0,202.4 1587.8,203.2 1616.0,203.2 1616.0,1187.7 1616.0,1744.5 1433.8,1744.4 74.8,1743.2 75.1,1702.1 82.0,1702.0 81.0,1652.0 75.4,1652.1 76.8,1364.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0041/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[851.0,975.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6985627,45.5283699]}},{"type":"Feature","properties":{"resourceCoords":[851.0,1364.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6985363,45.527652]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p42","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0042/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0042","type":"ImageService3","width":1627,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"29.7,176.2 1556.5,178.9 1557.3,561.4 1554.2,1330.4 1555.6,1712.0 25.2,1708.5 20.9,1708.5 19.9,1708.5 22.1,176.2 29.7,176.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0042/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[791.0,944.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6945071,45.5284441]}},{"type":"Feature","properties":{"resourceCoords":[791.0,1330.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6944793,45.5277276]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0043/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p43","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"15"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0043/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0043","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"68.4,1359.1 69.0,578.6 66.9,190.5 1580.1,188.3 1607.0,188.2 1607.0,1376.6 1607.0,1744.6 1398.7,1745.0 103.7,1746.3 86.1,1746.3 87.0,1707.0 70.7,1706.0 68.4,1359.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0043/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1228.0,1356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6894292,45.5278217]}},{"type":"Feature","properties":{"resourceCoords":[1228.0,189.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6895021,45.5299564]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0044/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0044","type":"ImageService3","width":1627,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"28.2,174.8 1176.3,173.7 1558.8,176.4 1561.0,1707.5 1177.5,1709.5 791.7,1705.8 791.6,1718.8 411.2,1723.3 411.9,1707.8 28.4,1708.5 14.2,1708.5 13.2,1708.5 14.0,174.8 28.2,174.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0044/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1169.0,1331.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68537751476819,45.527880671378256]}},{"type":"Feature","properties":{"resourceCoords":[1169.0,160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68545332180337,45.530054189633425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0045/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p45","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0045/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0045","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1036.0,1755.0 678.1,1753.2 252.7,1754.9 253.4,193.1 1100.0,194.0 1424.2,201.5 1423.3,1754.4 1036.0,1755.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0045/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1036.0,1755.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68228,45.527237]}},{"type":"Feature","properties":{"resourceCoords":[1036.0,194.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6823869,45.5300773]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p46","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0046/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0046","type":"ImageService3","width":1627,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"96.8,219.7 200.4,220.1 231.0,208.4 581.9,203.6 582.4,203.6 1367.3,150.6 1427.6,221.8 1468.3,272.9 1481.7,339.4 1528.3,339.5 1507.7,405.9 1496.7,486.9 1501.0,1034.7 1500.8,1345.2 1513.1,1734.2 1118.4,1732.0 634.1,1737.2 500.1,1743.5 113.9,1750.2 96.8,219.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[118.0,1358.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6812784238674,45.527981012609956]}},{"type":"Feature","properties":{"resourceCoords":[502.0,1358.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68026634009534,45.527991366955035]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p47","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.87"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0047/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0047","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"214.8,293.2 306.7,26.2 309.3,26.2 309.6,37.6 591.5,60.9 647.6,120.7 1518.7,75.4 1574.5,606.2 1491.1,1654.4 1556.0,1663.7 1566.5,1785.3 1403.0,1785.0 1024.4,1783.0 1024.3,1800.9 634.8,1786.2 634.8,1778.6 260.8,1776.0 255.0,1390.0 260.4,1082.2 265.1,539.0 277.2,459.0 298.9,393.4 252.6,392.6 240.4,326.4 214.8,293.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[255.0,1390.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6776343,45.528042]}},{"type":"Feature","properties":{"resourceCoords":[1403.0,1785.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6745512,45.5273735]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0049__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p49 [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":"6432.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0049__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0049","type":"ImageService3","width":1608,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"944.7,1536.3 935.2,1780.4 1053.0,1907.6 1067.0,1907.0 1162.0,1910.0 1163.0,1919.0 1260.4,1919.0 1581.5,1568.5 1571.8,1557.3 1549.5,1531.0 1535.2,108.7 170.8,101.1 209.3,134.5 319.1,229.4 555.0,775.1 908.1,1245.8 933.0,1295.8 950.4,1393.8 948.5,1439.7 809.5,1455.9 809.5,1497.3 809.5,1534.0 944.7,1536.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0049__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[532.0,382.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70739413135642,45.53194471736461]}},{"type":"Feature","properties":{"resourceCoords":[1727.0,1776.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70416274321393,45.52943850876637]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p5","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.68"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0005/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0005","type":"ImageService3","width":1630,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1559.8,1575.7 1629.0,1576.6 1619.0,1556.1 1570.8,1500.6 1629.0,1104.5 1629.0,667.8 1629.0,154.7 1516.5,150.4 1348.6,43.6 1.0,59.5 1.0,72.3 136.8,79.2 185.5,93.9 142.4,1081.5 71.0,1114.1 64.7,1654.1 179.9,1869.3 179.8,1897.0 310.0,1897.0 313.0,1892.0 355.0,1892.0 438.0,1905.0 502.0,1906.0 513.0,1902.0 517.0,1894.0 663.0,1891.0 868.0,1897.0 922.0,1903.0 956.0,1900.0 980.0,1904.0 1138.2,1905.7 1189.8,1854.1 1189.9,1841.9 1545.9,1669.8 1559.8,1575.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[401.0,919.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70715110855681,45.53973398926309]}},{"type":"Feature","properties":{"resourceCoords":[640.0,113.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70659153358554,45.541267572184985]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p50","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0050/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0050","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1059.4,1657.7 1373.6,1436.8 1363.6,1358.2 1373.6,1313.0 1375.1,954.9 1374.2,584.2 1373.2,199.5 229.0,198.0 228.9,382.5 228.4,1718.6 141.1,1718.1 1.0,1717.5 1.0,1773.8 994.2,1698.4 1059.4,1657.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[613.0,198.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.696455,45.5262655]}},{"type":"Feature","properties":{"resourceCoords":[229.0,198.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.696481,45.5269863]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p51","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0051/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0051","type":"ImageService3","width":1595,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"230.8,1698.5 247.0,416.5 249.7,195.1 724.8,201.2 1404.6,207.1 1400.1,595.3 1388.5,1745.0 1003.1,1741.0 619.0,1739.2 619.0,1749.0 230.4,1724.8 230.8,1698.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[628.0,973.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6903885,45.5263754]}},{"type":"Feature","properties":{"resourceCoords":[245.0,584.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.689401,45.5271098]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p52","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0052/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0052","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"225.6,1742.8 217.0,215.0 216.9,208.9 603.3,225.9 603.2,216.2 984.8,211.0 1367.8,207.9 1371.0,590.7 1380.7,1737.3 225.6,1742.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[612.0,977.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69442850863281,45.52629515435074]}},{"type":"Feature","properties":{"resourceCoords":[990.0,1744.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6964452756208,45.52556467890004]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p53","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0053/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0053","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1055.9,1549.0 601.1,1543.1 253.7,1542.2 254.7,865.1 257.4,391.8 641.2,393.3 640.4,408.9 1021.1,406.6 1021.3,393.5 1407.3,399.6 1401.5,1509.6 1397.8,1550.0 1055.9,1549.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[641.0,780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6873284,45.5264298]}},{"type":"Feature","properties":{"resourceCoords":[1021.0,1548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6862607,45.5250269]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p54","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.96"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0054/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0054","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"215.0,1515.2 217.4,412.8 598.5,411.8 1013.2,410.6 1361.9,412.6 1360.1,1175.2 1360.8,1556.7 211.6,1555.4 215.0,1515.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[598.0,794.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6842883,45.5264859]}},{"type":"Feature","properties":{"resourceCoords":[216.0,1172.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.685279,45.5257606]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0055/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p55","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0055/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0055","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"814.2,413.1 1197.0,410.9 1197.0,1561.0 813.6,1560.9 436.1,1560.7 435.0,1178.2 435.9,413.8 814.2,413.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0055/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1197.0,796.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6802297,45.5265622]}},{"type":"Feature","properties":{"resourceCoords":[1197.0,1561.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6801764,45.5251371]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p56","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0056/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0056","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"425.1,422.8 897.5,424.8 1282.5,432.9 1284.2,465.4 1280.4,1562.9 290.3,1559.0 294.3,426.9 425.1,422.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0056/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1282.0,1183.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.677528,45.5259044]}},{"type":"Feature","properties":{"resourceCoords":[293.0,806.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6802297,45.5265622]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p57","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0057/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0057","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1020.3,207.2 1020.2,238.6 1017.2,1383.2 1017.8,1739.6 646.0,1738.0 646.6,1355.2 647.8,239.1 646.0,206.0 1020.3,207.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[646.0,1738.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6774757,45.5244732]}},{"type":"Feature","properties":{"resourceCoords":[646.0,206.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.677587,45.5273239]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p58","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0058/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0058","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"616.1,1370.8 617.8,223.8 617.9,199.9 1008.5,212.8 1008.5,228.4 1007.6,1307.2 1005.9,1375.3 1008.3,1728.4 617.0,1728.0 616.1,1370.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0058/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[617.0,960.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6765417,45.5259152]}},{"type":"Feature","properties":{"resourceCoords":[617.0,1728.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6764882,45.5244891]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p59","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"confidence","value":"0.94"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0059/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0059","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"636.1,1378.8 637.8,1310.2 636.9,224.3 636.9,190.5 1019.0,190.0 1019.0,1733.0 639.1,1734.2 636.1,1378.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1019.0,1733.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6744509,45.524527]}},{"type":"Feature","properties":{"resourceCoords":[1019.0,190.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6745512,45.5273735]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p6","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"7"},{"label":"confidence","value":"0.17"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0006/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0006","type":"ImageService3","width":1605,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"440.1,1902.4 438.2,1883.7 1175.4,1866.3 1163.0,1747.0 1385.0,1726.7 1244.7,1367.8 1286.3,1363.7 1250.3,859.9 1171.4,867.0 1342.8,444.5 1400.8,429.0 1575.8,380.4 1575.6,348.1 1548.8,358.4 1541.8,162.9 1457.1,57.0 1183.0,41.6 434.8,151.4 207.3,104.7 119.8,153.0 88.0,295.4 1.0,301.6 1.0,479.6 83.0,1223.3 68.9,1613.3 380.6,1900.8 433.5,1902.2 440.1,1902.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[985.0,540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7012174,45.5406645]}},{"type":"Feature","properties":{"resourceCoords":[1163.0,1747.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7009663,45.5383146]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p60","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0060/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0060","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"612.5,1729.2 600.6,178.2 766.5,176.1 802.8,183.2 918.4,230.9 961.2,300.4 961.6,378.6 981.4,597.5 996.2,647.9 1001.1,1337.2 997.8,1727.3 612.5,1729.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[602.0,957.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67451284490626,45.52594402216313]}},{"type":"Feature","properties":{"resourceCoords":[602.0,1341.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67449568996611,45.52523918456303]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p61","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.88"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0061/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0061","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"447.0,1392.7 441.6,717.2 427.0,667.9 407.5,453.4 406.9,376.8 364.9,308.7 251.7,262.0 331.2,273.3 519.3,225.9 527.9,139.6 973.4,204.4 985.2,363.1 1070.9,407.7 1083.2,537.5 1178.9,593.4 1203.0,626.1 1285.5,944.1 1185.9,1756.3 1211.5,1755.0 1179.8,1766.8 825.3,1769.4 444.0,1775.0 447.0,1392.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[444.0,1013.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6734746,45.5259698]}},{"type":"Feature","properties":{"resourceCoords":[444.0,1775.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6734416,45.5245425]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p63","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0063/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0063","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"313.9,1727.4 311.9,1336.4 306.0,182.0 712.4,181.8 1186.4,183.5 1300.4,191.6 1212.0,826.4 1229.7,1338.1 1170.9,1351.3 1082.4,1714.5 1092.3,1725.9 313.9,1727.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[695.0,1334.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6963783,45.5241309]}},{"type":"Feature","properties":{"resourceCoords":[306.0,182.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6933642,45.5248974]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p64","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0064/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0064","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"483.6,1763.0 429.8,1740.8 419.6,1683.7 452.1,1655.0 323.5,1213.7 302.6,1189.9 613.8,971.9 604.0,894.1 614.0,849.3 616.0,495.0 615.7,128.2 1373.5,130.0 1446.6,213.6 1490.7,428.1 1327.8,1198.9 1403.4,1293.3 1398.7,1471.0 1325.3,1554.3 1039.0,1624.9 877.3,1819.7 493.7,1797.5 483.6,1763.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[616.0,495.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6984313,45.5247991]}},{"type":"Feature","properties":{"resourceCoords":[1130.0,1301.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7005765,45.5237829]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p65","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0065/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0065","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1393.3,1846.2 1337.0,1757.5 1296.5,1725.7 1247.5,1721.8 994.2,1720.7 304.1,1727.0 261.1,1731.9 257.9,1346.5 254.3,1000.1 254.4,546.8 251.0,205.9 290.8,210.4 440.0,208.1 535.8,216.0 574.5,188.1 670.9,182.2 837.6,193.1 1257.3,188.6 1316.8,193.1 1389.3,215.9 1510.2,707.5 1427.7,1278.8 1455.4,1764.9 1425.7,1880.5 1393.3,1846.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0065/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.6847278,45.5255183]}},{"type":"Feature","properties":{"resourceCoords":[1600.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.684653,45.5225406]}},{"type":"Feature","properties":{"resourceCoords":[1600.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.68975309999999,45.522477699999996]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.6898279,45.5254554]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0066/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0066","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1248.9,878.5 1276.9,1311.9 1219.6,1735.2 1106.9,1727.7 638.6,1727.8 237.2,1729.6 233.7,1348.9 223.5,212.6 266.4,207.7 953.1,202.1 1205.2,203.4 1254.0,207.3 1294.3,239.1 1350.2,327.4 1382.4,361.5 1248.9,878.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0066/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[615.0,203.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68927120246728,45.524243946284024]}},{"type":"Feature","properties":{"resourceCoords":[235.0,203.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68929005953706,45.52495447996116]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p67","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"24"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0067/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0067","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"255.0,1697.0 255.2,1315.5 255.9,314.4 636.4,314.7 1332.2,316.0 1429.5,318.8 1422.2,670.1 1418.5,961.8 1396.3,997.1 1398.4,1249.3 1381.9,1279.4 1380.7,1358.1 1398.6,1387.0 1394.8,1698.2 255.0,1697.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[636.0,938.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6791411,45.524443]}},{"type":"Feature","properties":{"resourceCoords":[255.0,1697.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6811959,45.5251186]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p68","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.99"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0068/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0068","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1310.9,1688.3 1251.2,1683.6 830.4,1686.7 663.4,1675.3 566.7,1680.9 527.8,1708.8 431.8,1700.5 282.2,1702.3 242.3,1697.6 236.3,541.4 234.5,162.5 1384.0,157.4 1378.5,167.2 1365.0,813.7 1430.5,1156.7 1383.4,1711.5 1310.9,1688.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1385.0,1314.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68418307428995,45.5229381525228]}},{"type":"Feature","properties":{"resourceCoords":[622.0,539.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68217193654974,45.52438468335736]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p69","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"28"},{"label":"confidence","value":"0.78"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0069/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0069","type":"ImageService3","width":1600,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"527.8,1256.6 579.6,1178.1 588.7,1079.9 634.7,376.5 1008.3,401.5 961.8,1104.7 952.7,1169.5 923.5,1263.9 829.9,1448.1 778.9,1523.5 723.0,1473.4 559.8,1397.7 476.5,1378.2 465.0,1330.0 527.8,1256.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[610.0,762.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6774494,45.5237594]}},{"type":"Feature","properties":{"resourceCoords":[465.0,1330.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6776959,45.5226897]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p7","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0007/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0007","type":"ImageService3","width":1630,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"185.2,845.0 408.9,434.6 469.7,425.5 653.8,396.3 657.3,363.4 1034.5,266.0 1625.8,303.4 1600.0,684.9 1597.3,865.4 1591.2,1380.4 1584.8,1766.6 1229.8,1760.1 1202.0,1742.0 827.0,1741.5 826.7,1757.8 586.9,1752.2 302.8,1745.8 201.6,1363.8 244.5,1364.5 266.4,847.0 185.2,845.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[465.0,852.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7000166,45.5400178]}},{"type":"Feature","properties":{"resourceCoords":[1202.0,1380.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.697977,45.5390823]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p70","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0070/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0070","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"926.2,1443.2 923.0,1451.9 523.4,1372.4 572.2,1260.7 596.0,1164.3 601.3,1098.8 606.6,391.4 1001.4,393.8 997.2,809.5 996.4,1100.6 999.9,1254.3 990.6,1296.2 928.4,1437.9 926.2,1443.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[977.0,1413.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67543107276587,45.522630376923395]}},{"type":"Feature","properties":{"resourceCoords":[609.0,1154.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67641907364518,45.523085783194595]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p71","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.76"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0071/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0071","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"666.8,1280.5 674.3,1239.7 665.2,1091.0 655.5,809.2 644.5,406.6 1013.1,394.1 1031.0,1044.6 1046.0,1345.0 1036.0,1445.0 939.3,1423.2 611.7,1420.0 666.8,1280.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1036.0,1445.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.674406,45.5225294]}},{"type":"Feature","properties":{"resourceCoords":[1036.0,1144.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6744011,45.5231015]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p72","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0072/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0072","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"630.6,1352.0 620.7,1044.7 614.0,379.4 994.5,375.5 1004.4,918.2 1011.1,1517.4 1000.1,1605.0 618.6,1454.0 630.6,1352.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[993.0,766.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67343357033496,45.52381647086969]}},{"type":"Feature","properties":{"resourceCoords":[993.0,385.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67344521508467,45.52452476362777]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p73","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.92"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0073/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0073","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1019.6,234.2 1036.0,621.0 1042.5,928.9 1053.6,1206.3 1094.4,1383.9 1089.8,1463.2 1026.3,1627.1 649.0,1482.0 659.3,1393.8 647.6,790.9 633.1,244.9 1019.6,234.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[649.0,1482.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.673389,45.5222568]}},{"type":"Feature","properties":{"resourceCoords":[1036.0,621.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6723759,45.52385]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.95"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0074/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0074","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"950.6,1768.0 606.4,1633.6 670.5,1469.2 675.2,1389.5 634.6,1211.1 624.0,932.5 618.0,623.2 602.3,234.8 963.2,228.2 972.3,614.6 1003.0,614.1 1014.1,848.6 1024.4,1292.5 1052.1,1446.8 1054.5,1499.3 1042.6,1586.5 978.9,1779.1 950.6,1768.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0074/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[618.0,1000.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67237081148464,45.523156867349044]}},{"type":"Feature","properties":{"resourceCoords":[618.0,237.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67238115352558,45.52456066411008]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0075/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p75","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"11"},{"label":"confidence","value":"0.86"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0075/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0075","type":"ImageService3","width":1629,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"604.8,1640.8 673.1,1451.8 687.2,1365.8 686.2,1313.8 663.0,1160.3 664.9,720.6 660.2,488.1 629.8,487.9 631.4,105.1 663.5,93.7 1091.1,78.7 1083.7,165.5 1042.2,490.5 1036.5,673.0 1035.7,1019.4 1037.4,1233.9 994.6,1231.5 958.5,1301.5 909.4,1768.1 855.4,1745.5 751.9,1702.2 731.9,1693.9 604.8,1640.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0075/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[983.0,1784.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6703977,45.5214837]}},{"type":"Feature","properties":{"resourceCoords":[645.0,488.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6714054,45.5238699]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.56"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0076/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0076","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"603.5,1235.1 646.6,1240.0 657.4,1023.0 678.5,673.0 695.0,488.9 755.9,162.8 768.4,75.6 854.3,77.5 878.4,22.6 889.6,22.2 892.2,66.2 1020.1,122.1 1472.0,185.2 1548.2,974.5 1471.1,1580.1 1227.5,1661.3 1179.6,1620.1 1153.0,1669.4 999.2,1655.4 900.1,1853.1 707.1,1865.2 702.7,1898.9 695.0,1899.0 690.6,1900.0 557.2,1814.3 559.4,1792.8 490.9,1774.8 485.9,1772.4 562.9,1303.8 603.5,1235.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0076/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[664.0,521.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67042555602839,45.52382550555291]}},{"type":"Feature","properties":{"resourceCoords":[611.0,1218.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67039905905385,45.52254284942671]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0078/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p78","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0078/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0078","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"404.4,646.0 424.3,618.3 497.8,589.1 532.0,592.9 765.1,493.9 806.5,500.8 1078.4,391.9 1407.1,263.4 1395.3,355.9 1371.6,448.6 1334.2,562.0 1336.7,1786.4 784.1,1786.0 731.7,1689.9 446.5,1714.3 338.4,1655.0 234.6,981.8 143.2,828.3 114.3,762.4 404.4,646.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0078/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[839.0,479.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67904772052212,45.522993244651545]}},{"type":"Feature","properties":{"resourceCoords":[337.0,1618.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.68138249821735,45.52134697670885]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0079/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p79","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"confidence","value":"0.97"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0079/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0079","type":"ImageService3","width":1629,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"694.5,516.0 778.1,497.5 958.5,495.2 1030.7,516.2 1026.7,847.0 1019.5,1238.0 1015.3,1833.5 614.8,1829.3 624.3,591.6 663.2,477.4 694.5,516.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0079/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1024.0,889.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.677185,45.5217457]}},{"type":"Feature","properties":{"resourceCoords":[616.0,1658.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6788994,45.5206801]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0080/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p80","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"confidence","value":"0.89"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0080/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0080","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"594.2,425.9 595.9,341.6 990.5,263.8 998.2,479.9 997.5,811.1 1001.8,1230.5 999.5,1821.0 569.2,1817.4 571.9,1228.7 578.0,842.1 581.2,515.1 594.2,425.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0080/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[998.0,886.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6761342,45.5214641]}},{"type":"Feature","properties":{"resourceCoords":[998.0,502.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6757742,45.5221347]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0081/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p81","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"5"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0081/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0081","type":"ImageService3","width":1624,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"586.0,339.3 586.1,333.6 901.9,220.5 1002.5,207.2 999.4,1780.4 999.2,1894.0 991.0,1894.0 877.0,1905.0 779.0,1904.0 693.0,1893.0 595.6,1899.2 597.9,1320.3 593.5,898.8 594.2,565.9 586.0,339.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0081/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[594.0,974.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6761342,45.5214641]}},{"type":"Feature","properties":{"resourceCoords":[594.0,588.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6757742,45.5221347]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0082/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p82","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.93"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0082/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0082","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"577.4,199.4 990.9,190.8 994.4,226.6 1013.6,927.7 1018.6,1232.4 1034.7,1831.8 997.5,1832.5 825.0,1896.7 805.0,1896.0 619.5,1906.5 616.5,1781.9 577.4,199.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0082/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[604.0,1728.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67585785814623,45.51989903287055]}},{"type":"Feature","properties":{"resourceCoords":[604.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.67434160767567,45.522509934876226]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0083/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p83","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.98"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0083/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0083","type":"ImageService3","width":1625,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"624.5,1845.5 624.6,1249.2 627.9,946.2 627.5,248.7 625.0,213.0 1027.7,214.8 1024.0,907.4 1024.0,1333.0 1021.5,1754.5 1025.3,1848.8 624.5,1845.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0083/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[625.0,1750.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6748203,45.5195878]}},{"type":"Feature","properties":{"resourceCoords":[625.0,213.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.673389,45.5222568]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0084/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p84","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"},{"label":"confidence","value":"0.91"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0084/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0084","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"615.8,1730.3 616.0,1316.1 613.9,897.8 614.0,217.0 974.2,217.9 972.1,936.0 974.9,974.7 997.5,974.3 998.1,1314.4 1013.4,1563.2 1015.0,1813.9 1014.9,1824.2 620.0,1823.0 615.8,1730.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0084/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[614.0,596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6727566,45.5213227]}},{"type":"Feature","properties":{"resourceCoords":[614.0,217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6723926,45.521991]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0086__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p86 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.73"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6504.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0086__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0086","type":"ImageService3","width":1626,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"204.3,1863.6 255.7,1874.4 723.7,1877.5 1187.5,1718.0 1439.3,1701.1 1402.7,1003.2 1174.0,1019.2 1008.5,933.0 783.0,257.6 613.4,237.2 606.0,217.0 536.7,230.6 472.3,230.5 337.4,230.2 198.6,229.9 168.3,229.7 163.5,964.8 166.2,1004.4 189.4,1004.0 188.8,1352.2 203.6,1607.0 204.3,1863.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0086__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[606.0,617.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6707695,45.5207938]}},{"type":"Feature","properties":{"resourceCoords":[606.0,217.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6703977,45.5214837]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0008__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p8 [1]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"2"},{"label":"confidence","value":"0.64"},{"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":"6420.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0008__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0008","type":"ImageService3","width":1605,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"9.7,901.8 39.0,1425.6 59.0,1818.4 450.8,1793.2 826.5,1777.4 825.5,1757.0 1584.2,1737.0 1584.0,1733.0 1592.8,1730.8 1592.5,1727.4 1584.0,1727.0 1584.3,1712.3 1540.6,1721.0 1526.2,1159.5 1593.2,1181.3 1593.0,1166.9 851.9,526.7 853.8,524.6 348.2,79.8 328.9,30.9 282.0,76.7 310.1,111.0 94.6,240.6 75.0,328.7 1.0,328.9 1.0,737.5 9.7,901.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0008__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1192.0,1370.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.6938838,45.5391601]}},{"type":"Feature","properties":{"resourceCoords":[1545.0,1370.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.692952,45.5391433]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p9","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.40"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0009/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0009","type":"ImageService3","width":1619,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"54.4,1812.6 81.6,825.7 84.5,825.8 109.3,147.5 135.2,101.2 69.5,93.8 77.2,55.5 865.9,36.3 1219.3,120.0 1339.6,45.6 1413.1,108.5 1571.0,89.0 1592.6,148.0 1618.0,1110.8 1618.0,1127.7 1528.0,1842.7 1247.4,1899.9 818.1,1899.2 654.0,1898.0 642.7,1898.9 178.8,1898.1 65.5,1879.2 47.8,1833.5 43.2,1822.0 54.4,1812.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[93.0,107.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69613175583301,45.54161137542227]}},{"type":"Feature","properties":{"resourceCoords":[490.0,107.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.69545341902858,45.542163434651236]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0097__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p97 [2]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.67"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2906.0"},{"label":"split_canvas_w","value":"2041.6"},{"label":"split_canvas_h","value":"4774.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0097__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0097","type":"ImageService3","width":1615,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"479.6,1865.2 457.1,757.5 42.4,791.5 86.8,1248.8 32.1,1345.1 38.4,1638.5 66.0,1640.1 68.0,1680.1 48.0,1687.1 39.4,1687.1 43.5,1877.4 479.6,1865.2\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0097__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[479.4,1119.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7476359,45.5649625]}},{"type":"Feature","properties":{"resourceCoords":[479.4,759.5],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7482865,45.56541]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0098__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p98 [1]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.30"},{"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":"6552.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0098__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0098","type":"ImageService3","width":1638,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1524.1,1659.0 1553.5,1325.4 1583.4,1325.1 1572.5,861.0 1486.2,540.0 1361.5,539.3 1288.5,466.1 1090.5,472.3 1089.9,466.4 1088.5,466.4 1088.5,452.4 1062.6,188.0 968.1,34.5 307.9,45.5 80.1,117.2 42.7,240.8 88.9,1210.0 49.5,1727.0 136.9,1822.2 268.9,1830.2 599.5,1751.8 804.6,1789.4 936.2,1884.8 1449.6,1894.8 1449.7,1898.8 1474.6,1898.9 1537.4,1674.5 1524.1,1659.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0098__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":[-122.72269992201967,45.541017515941]}},{"type":"Feature","properties":{"resourceCoords":[1638.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7183999416035,45.54103376599112]}},{"type":"Feature","properties":{"resourceCoords":[1638.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.71837293759556,45.53747853667654]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.72267291801174,45.53746228662641]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099A/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99A","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.70"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099A/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099A","type":"ImageService3","width":1642,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"482.2,1637.9 221.4,1703.7 217.4,1638.5 220.9,754.4 218.6,227.7 1249.4,151.0 1250.2,164.1 1390.2,162.4 1441.0,174.3 1460.0,1185.5 1389.1,1223.2 1417.2,1775.0 1358.1,1679.5 482.2,1637.9\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099A/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[966.0,1459.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70914432043448,45.5389285615507]}},{"type":"Feature","properties":{"resourceCoords":[966.0,200.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.70906368814244,45.541244949587394]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099B/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99B","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.52"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099B/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099B","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"24.0,1875.6 31.2,1809.0 79.0,1809.0 81.0,1760.0 36.9,1756.0 45.6,1675.0 25.7,1622.4 85.1,1557.5 91.3,1193.8 62.7,1148.8 92.8,1107.2 97.9,808.0 165.2,749.9 208.8,710.1 318.2,609.8 899.9,435.1 1419.4,132.4 1473.1,113.0 1574.7,107.0 1620.0,114.2 1620.0,1033.1 1608.1,1128.4 1584.3,1582.3 1580.5,1583.8 1557.1,1906.1 1521.7,1906.3 1511.6,1872.8 155.1,1883.2 43.8,1814.3 29.6,1901.5 25.2,1895.6 24.0,1875.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099B/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1430.0,1600.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7100776,45.5299816]}},{"type":"Feature","properties":{"resourceCoords":[1018.0,1435.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7098077,45.5307578]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099C/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99C","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.71"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099C/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099C","type":"ImageService3","width":1642,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"206.9,1900.4 283.5,1901.5 327.1,1849.7 338.6,1857.9 1462.7,1289.5 1473.2,1252.0 1480.2,1240.1 1485.2,1231.6 1541.2,1177.0 1549.7,1159.3 1549.0,1104.1 1489.3,935.6 1509.2,808.5 1507.0,752.5 1485.3,672.5 1502.6,594.0 1561.5,516.4 1571.9,472.3 1560.4,412.9 1523.2,458.3 1504.2,469.5 1359.2,16.9 1350.3,16.5 1330.5,15.7 1325.7,154.1 1275.7,188.0 1276.0,108.5 1264.4,14.8 1139.0,19.0 970.0,15.0 927.0,9.0 926.1,1.0 886.9,1.0 886.0,9.0 817.0,13.0 596.0,10.0 594.2,1.0 524.9,1.0 524.0,9.0 496.0,9.0 495.1,1.0 325.8,1.0 242.6,80.8 1.0,75.6 1.0,796.9 21.6,950.8 22.6,1052.1 58.3,1492.5 54.8,1494.4 73.9,1808.0 45.5,1825.4 68.7,1876.8 206.9,1899.9 206.9,1900.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099C/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7060327,45.5298431]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7059949,45.5268025]}},{"type":"Feature","properties":{"resourceCoords":[1642.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.71106999999999,45.526771600000004]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7111078,45.5298122]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099D__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99D [2]","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.21"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"4079.6"},{"label":"split_canvas_y","value":"5130.0"},{"label":"split_canvas_w","value":"2360.4"},{"label":"split_canvas_h","value":"2550.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099D__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099D","type":"ImageService3","width":1610,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1565.2,1312.7 1054.5,1304.6 1097.2,1899.6 1105.8,1896.0 1199.8,1901.7 1259.5,1900.0 1269.5,1898.0 1348.4,1896.0 1350.7,1897.3 1578.5,1890.8 1530.1,1501.9 1577.3,1479.8 1565.2,1312.7\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099D__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[1019.9,1282.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70507685171641,45.503218197077416]}},{"type":"Feature","properties":{"resourceCoords":[1610.0,1282.5],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70552056661563,45.502184493821204]}},{"type":"Feature","properties":{"resourceCoords":[1610.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70710163258629,45.502522571346276]}},{"type":"Feature","properties":{"resourceCoords":[1019.9,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.70665791768707,45.50355627460249]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099H__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99H [1]","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.20"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3477.2"},{"label":"split_canvas_w","value":"6480.0"},{"label":"split_canvas_h","value":"4202.8"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099H__1/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099H","type":"ImageService3","width":1620,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"234.9,1187.4 239.2,1199.7 251.3,1324.6 244.0,1324.0 251.3,1397.1 287.0,1398.2 251.5,1426.5 245.1,1608.5 203.5,1622.0 189.8,1637.5 188.5,1670.0 256.9,1649.3 293.4,1758.5 410.2,1729.0 481.8,1728.8 443.6,1752.0 329.8,1806.8 415.1,1885.2 457.2,1909.2 458.7,1905.0 1256.4,1905.5 1297.0,1874.8 1521.1,1875.1 1548.0,1641.4 1500.8,1563.7 1487.2,1550.9 1375.2,1541.0 1333.5,1546.8 1168.4,1217.8 1227.0,1233.9 1289.5,1258.5 1254.7,1183.7 1245.0,1172.4 1205.6,1158.5 1179.1,1086.5 1177.7,1045.0 1156.5,1014.2 1150.8,1009.7 1130.8,955.2 1117.0,932.6 1121.5,873.6 976.9,874.9 976.4,881.3 919.7,883.9 878.5,880.5 894.1,907.8 965.6,915.8 963.8,930.6 723.5,987.5 728.6,997.9 750.6,1018.9 719.4,1022.5 697.0,1015.4 659.1,981.7 619.1,969.6 576.9,977.6 547.7,976.5 482.7,961.1 393.1,985.3 364.4,983.4 234.9,1187.4\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099H__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[686.0,1320.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.707284,45.525857]}},{"type":"Feature","properties":{"resourceCoords":[287.0,1398.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7092725,45.5254578]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099I/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99I","metadata":[{"label":"streets","value":"18"},{"label":"intersections","value":"13"},{"label":"confidence","value":"0.73"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099I/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099I","type":"ImageService3","width":1623,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1069.0,41.8 1067.4,80.8 1093.2,103.8 1088.9,109.5 1364.2,690.6 1383.2,696.4 1393.4,702.9 1420.5,732.2 1429.3,736.6 1312.7,943.5 1317.5,955.4 1335.7,1077.3 1328.5,1077.1 1339.5,1148.5 1374.5,1147.7 1341.1,1177.3 1344.0,1356.2 1303.9,1371.6 1291.2,1387.5 1291.6,1419.5 1357.7,1395.7 1399.0,1501.1 1512.2,1466.2 1582.3,1462.3 1546.0,1487.1 1437.2,1546.6 1524.9,1619.3 1567.4,1640.7 1509.4,1842.8 1224.1,1807.0 998.7,1869.9 83.5,1868.0 59.4,840.4 100.4,82.8 249.5,76.7 314.3,30.6 384.1,55.3 1059.0,42.0 1069.0,41.8\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099I/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[557.0,332.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.713649,45.528313]}},{"type":"Feature","properties":{"resourceCoords":[824.0,32.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7123207,45.5294341]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099J__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99J [2]","metadata":[{"label":"streets","value":"2"},{"label":"intersections","value":"1"},{"label":"confidence","value":"0.60"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"3167.6"},{"label":"split_canvas_w","value":"6524.0"},{"label":"split_canvas_h","value":"4512.4"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099J__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099J","type":"ImageService3","width":1631,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"50.5,1814.5 79.0,1898.1 183.1,1905.0 271.0,1905.0 284.0,1910.0 284.2,1911.7 378.9,1918.0 398.6,1816.7 903.3,1833.5 890.5,1626.0 990.8,1529.7 1002.4,1529.6 1541.9,1440.0 1578.3,1354.4 1517.6,966.3 1216.2,1004.9 824.2,844.9 551.0,843.6 318.6,1010.0 130.5,1028.9 65.0,1121.9 50.5,1814.5\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099J__2/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,791.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7311746037917,45.55916047771066]}},{"type":"Feature","properties":{"resourceCoords":[1631.0,791.9],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.72737099882153,45.55772381550578]}},{"type":"Feature","properties":{"resourceCoords":[1631.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.72879049634993,45.55587924443136]}},{"type":"Feature","properties":{"resourceCoords":[0.0,1920.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-122.7325941013201,45.55731590663624]}},{"type":"Feature","properties":{"resourceCoords":[386.0,1374.4],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7310086,45.5578684]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Portland, Oregon | 1950 | sanborn07439_021 p99 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"},{"label":"confidence","value":"0.92"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"1668.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4816.0"},{"label":"split_canvas_h","value":"7680.0"}],"created":"2026-10-24T15:10:41Z","modified":"2026-10-24T15:10:41Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099","type":"ImageService3","width":1621,"height":1920},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"455.0,1719.3 454.6,1797.2 553.0,1792.9 1108.7,1740.5 1254.1,1720.7 1453.6,1678.6 1501.8,1666.0 1497.9,1601.2 1502.4,723.7 1500.8,200.8 831.8,249.8 765.8,542.4 786.9,825.8 693.3,885.4 693.1,916.3 644.9,916.3 514.5,999.5 494.8,1720.4 455.0,1719.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd429m:g4294m:g4294pm:g4294pm_g07439195001:07439_01_1950-0099__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[970.0,1753.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7125285,45.5383733]}},{"type":"Feature","properties":{"resourceCoords":[970.0,215.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-122.7124343,45.5412241]}}]}}]}