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Aerial images from a UAS survey of the debris flow at South Fork Campground, Sequoia National Park, CA

This portion of the data release presents aerial images of the debris flow at South Fork Campground in Sequoia National Park. The images were acquired during an uncrewed aerial systems (UAS) survey on 30 April 2024, conducted under authorization from the National Park Service. The imagery was acquired with a Ricoh GR II digital camera featuring a global shutter. The camera was mounted to the UAS using a fixed mount, in an approximately nadir orientation. The camera was set to acquire images at 1 hertz, using an external intervalometer. The UAS was flown on pre-programmed autonomous flight lines spaced to provide approximately 70 percent overlap between images from adjacent lines, from an approximate altitude of 110 meters above ground level (AGL), resulting in a nominal ground-sample-distance (GSD) of 2.9 centimeters per pixel. The images were geotagged using positions from the UAS onboard single-frequency autonomous GPS. The original images were acquired in Adobe DNG format but have been converted to JPG format to reduce their size and to facilitate distribution. During the conversion, adjustments were made to the exposure value (EV), to improve image brightness. Only the images which were used for the creation of the topographic data products (also presented in this data release) have been included. Images of the takeoff and landing sequence, as well as images from outside the area of interest have been omitted.

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Author(s) Joshua Logan orcid, Amy East orcid
Publication Date 2024-12-19
Beginning Date of Data 2024-04-30
Ending Date of Data 2024-04-30
Data Contact
DOI https://doi.org/10.5066/P144KDGN
Citation Logan, J., and East, A., 2024, Aerial images from a UAS survey of the debris flow at South Fork Campground, Sequoia National Park, CA: U.S. Geological Survey data release, https://doi.org/10.5066/P144KDGN.
Metadata Contact
Metadata Date 2024-12-19
Related Publication
Citations of these data No citations of these data are known at this time.
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License http://www.usa.gov/publicdomain/label/1.0/
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Harvest Source: Coastal and Marine Geoscience Data System
Harvest Date: 2025-01-22T04:21:20.072Z