| Description |
This portion of the data release presents the raw aerial imagery collected during the uncrewed aerial system (UAS) survey conducted on the ocean beaches adjacent to the Columbia River Mouth at the Oregon-Washington border in August 2017. The imagery was acquired using a Department of Interior-owned 3DR Solo quadcopter fitted with a Ricoh GR II digital camera featuring a global shutter. The camera was mounted using a fixed mount on the bottom of the UAS and oriented in an approximately nadir orientation. The Fort Stevens State Park survey was conducted under Oregon Parks and Recreation Department Scientific Research Permit #024-17. Five flights were conducted at Fort Stevens State Park on 7 August 2017, between 16:32 and 20:22 UTC (9:32 and 13:22 PDT). A total of 785 aerial images from these flights are presented in this data release. The Benson Beach survey at Cape Disappointment State Park was conducted under Washington State Parks and Recreation Commission Scientific Research Permit #170603. Seven flights were conducted at Benson Beach on 8 August 2017, between 17:13 and 22:28 UTC (10:13 and 15:28 PDT). A total of 1492 aerial images from these flights are presented in this data release. All flights were conducted at an approximate altitude of 120 meters or less above ground level, depending on operational restrictions related to the cloud ceiling. Before each flight, the camera’s digital ISO, aperture, and shutter speed were adjusted for ambient light conditions. For all flights the camera was triggered using a built-in intervalometer. After acquisition, the images were renamed to include flight number and acquisition time in the file name. The coordinates of the approximate image acquisition locations were added ('geotagged') to the image metadata (EXIF) using the telemetry log from the UAS onboard single-frequency autonomous GPS. The image EXIF were also updated to include additional information related to the acquisition. The data release includes a total of 2,277 JPG images. Images from takeoff and landing sequences as well as other images not used for processing have been omitted from the data release. To facilitate bulk download, the images from each flight are provided in a zip file named with the flight number. In addition to the provided zip files, the images are also available for browsing and individual download on the USGS Coastal and Marine Hazards and Resources Program Imagery Data System at the following URL: https://cmgds.marine.usgs.gov/idsviewer/data_release/10.5066-P9BVTVAW. [More]
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