{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Christopher Holmquist-Johnson", "hasEmail": "mailto:h-johnsonc@usgs.gov"}, "description": "The U.S. Geological Survey collected low-altitude airborne natural color imagery via a fixed-wing uncrewed aircraft system (UAS) for mapping channel and vegetation change along a 2-mile reach of the Middle Green River at Grays Canyon near Green River, UT. Visual imagery was collected in jpg format and Structure-from-Motion (SfM) photogrammetry techniques were applied (Over et. al. 2021) using Agisoft Metashape Professional (v. 2.1.2 build 18358) to derive time-specific high-resolution 5 centimeter natural color orthomosaics of the study reach annually from 2021 to 2023. Ground control points (2ft x 2ft ground targets) were also surveyed in the field using Trimble RTK GPS survey units and were used in georectification in the SfM process.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P1YK827D", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.66b3a891d34eebcf8bb33bd2.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_66b3a891d34eebcf8bb33bd2", "keyword": ["Grays Canyon", "Green River", "UAS", "USGS:66b3a891d34eebcf8bb33bd2", "Utah", "aerial photography", "drone", "environment", "geoscientificInformation", "hydrology", "image collections", "imageryBaseMapsEarthCover", "remote sensing", "riparian", "surface water (non-marine)", "uncrewed aircraft system", "unoccupied aircraft system"], "modified": "2024-08-27T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-110.11910, 39.11020, -110.09640, 39.13850", "theme": ["geospatial"], "title": "High resolution natural color imagery collected by uncrewed aircraft system (UAS) for mapping channel and vegetation change along a 2-mile reach of the Middle Green River at Grays Canyon near Green River, Utah from 2021-2023"}