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Spatial Extent of Data

USGS Data Source

USGS Thesaurus Keywords

aerial photography, remote sensing, geomorphology, topography, image mosaics, geospatial datasets, topographic maps

ISO 19115 Topic Category

elevation, geoscientificInformation

Other Subject Keywords

remote sensing, USGS, U.S. Geological Survey, CHMRP, UAS, Unmanned aerial system, altimetry, Bathymetry and Elevation, PCMSC, photography, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Structure-from-motion, orthophotography, aerial and satellite photography

Place Keywords

Fort Stevens, Pacific County, Columbia River, State of Oregon, Cape Disappointment, North Head, Clatsop Spit, Clatsop County, Benson Beach, State of Washington, Pacific Ocean

July 2021: Ground control point locations for UAS surveys of the beaches at Fort Stevens State Park, OR, and Cape Disappointment State Park, WA

This portion of the data release presents the locations of the temporary ground control points (GCPs) used for the structure-from-motion (SfM) processing of the imagery collected during the July 2021 unoccupied aerial system (UAS) surveys of the ocean beach at Fort Stevens State Park, OR, and Benson Beach at Cape Disappointment State Park, WA. Eighteen temporary ground control points (GCPs) were distributed throughout the survey area to establish survey control. The GCPs consisted of a combination of small square tarps with black-and-white cross patterns and "X" marks placed on the ground using temporary chalk. The GCP positions were measured using dual-frequency post-processed kinematic (PPK) GPS with corrections referenced to a static base station operating nearby. The GCP positions are presented in a comma-delimited text file.

Get Data and Metadata
Author(s) Joshua Logan orcid, Andrew Stevens orcid, Shawn R Harrison orcid, Cordell Johnson
Publication Date 2023-06-23
Beginning Date of Data 2021-07-22
Ending Date of Data 2021-07-23
Data Contact
PCMSC Science Data Coordinator
DOI https://doi.org/10.5066/P9BVTVAW
Citation Logan, J., Stevens, A., Harrison, S.R., and Johnson, C., 2023, July 2021: Ground control point locations for UAS surveys of the beaches at Fort Stevens State Park, OR, and Cape Disappointment State Park, WA: U.S. Geological Survey data release, https://doi.org/10.5066/P9BVTVAW.
Metadata Contact
PCMSC Science Data Coordinator
Metadata Date 2026-03-23
Related Publication
Citations of these data No citations of these data are known at this time.
Access public
License http://www.usa.gov/publicdomain/label/1.0/
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Harvest Source: Coastal and Marine Geoscience Data System
Harvest Date: 2026-04-01T04:10:43.059Z