{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn03661_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Union Bridge, Maryland | 1910 | mapsnap generated fit (2026-10-20)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-20"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"8"},{"label":"placed","value":"3"},{"label":"unplaced","value":"5"},{"label":"fit sources","value":"georef-snap 2, georef 1"},{"label":"key map","value":"none"},{"label":"split sheets","value":"2 sheet(s) cut into 5 panels"},{"label":"unplaced pages","value":"p1__1 (tier 4, 39.56867,-77.17841 +/-256m); p1__2 (tier 1, 39.66333,-77.17414 +/-128m); p1__3 (tier 4, 39.56867,-77.17841 +/-256m); p4__1 (tier 1, 39.56582,-77.17865 +/-199m); p5 (tier 4, 39.56867,-77.17841 +/-256m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Union Bridge, Maryland | 1910 | sanborn03661_002 p2","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.80"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T01:04:44Z","modified":"2026-10-20T01:04:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0002/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0002","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"132.2,1679.1 148.2,1209.0 187.8,673.8 198.2,450.1 221.3,184.3 272.1,181.4 274.5,134.7 211.1,130.1 263.1,114.0 366.4,187.0 561.0,197.9 1040.5,65.9 1483.7,89.1 1528.2,149.5 1525.3,305.3 1510.5,724.0 1507.7,1167.9 1508.4,1483.3 1504.4,1748.9 1494.3,1824.5 1153.3,1861.9 780.8,1777.7 781.2,1770.7 632.0,1744.0 127.7,1743.2 132.2,1679.1\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1168.0,1160.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.1779948890381,39.56822813200495]}},{"type":"Feature","properties":{"resourceCoords":[192.0,705.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.17995283481562,39.56947349031119]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Union Bridge, Maryland | 1910 | sanborn03661_002 p3","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"},{"label":"confidence","value":"0.85"},{"label":"confidence_model","value":"corpus-v2"}],"created":"2026-10-20T01:04:44Z","modified":"2026-10-20T01:04:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0003/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0003","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"145.5,107.6 1356.7,75.0 1493.7,133.0 1563.8,1618.5 1500.3,1826.0 572.7,1734.4 91.7,1782.2 102.6,1706.5 109.3,1440.3 111.8,1124.2 119.1,679.2 138.2,259.7 142.6,103.6 145.5,107.6\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[402.0,690.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.17631595662913,39.5686962776187]}},{"type":"Feature","properties":{"resourceCoords":[1497.0,690.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.1738169659208,39.56821766238258]}}]}},{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0004__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Union Bridge, Maryland | 1910 | sanborn03661_002 p4 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"3"},{"label":"confidence","value":"0.29"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"3372.8"}],"created":"2026-10-20T01:04:44Z","modified":"2026-10-20T01:04:44Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0004__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0004","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"66.5,779.3 128.0,780.2 578.3,770.6 1092.0,780.2 1306.4,778.4 1561.7,786.4 1567.2,834.6 1612.0,834.4 1612.0,771.0 1576.8,675.8 1550.8,79.7 1518.8,119.7 1234.5,23.9 166.5,43.9 38.0,249.1 66.5,779.3\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd384m:g3844m:g3844um:g3844um_g036611910:03661_1910-0004__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1092.0,780.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.1799441,39.5695303]}},{"type":"Feature","properties":{"resourceCoords":[128.0,780.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-77.1806656,39.5677873]}}]}}]}