Joshua B. Logan Andrew W. Stevens Shawn R. Harrison 20230623 comma-delimited text data release DOI:10.5066/P9BVTVAW Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9BVTVAW https://www.sciencebase.gov/catalog/item/64384d99d34ee8d4addf02a8 Joshua B. Logan Andrew W. Stevens Shawn R. Harrison Cordell D. Johnson 2023 data release DOI:10.5066/P9BVTVAW Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey Suggested Citation: Logan, J.B., Stevens, A.W., Harrison, S.R., and Johnson, C.D., 2023, Aerial imagery and structure-from-motion data products from 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. https://doi.org/10.5066/P9BVTVAW 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 August 2017 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 real-time kinematic (RTK) or 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. These data were obtained to evaluate changes in shoreline position and coastal morphology. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic features on the sub-aerially exposed portions of the beaches surveyed. Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-666-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20170807 20170808 ground condition at time data were collected Complete None planned -124.07881 -123.99639 46.29649 46.20298 ISO 19115 Topic Category elevation geoscientificInformation Data Categories for Marine Planning Bathymetry and Elevation USGS Thesaurus topography topographic maps remote sensing geomorphology aerial photography image mosaics geospatial datasets Marine Realms Information Bank (MRIB) keywords photography remote sensing aerial and satellite photography altimetry orthophotography None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CHMRP Pacific Coastal and Marine Science Center PCMSC UAS Unmanned aerial system Structure-from-motion USGS Metadata Identifier USGS:64384d99d34ee8d4addf02a8 Geographic Names Information System (GNIS) State of Washington State of Oregon Pacific Ocean Columbia River Clatsop County Pacific County Cape Disappointment Fort Stevens Benson Beach Clatsop Spit North Head None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/64384d99d34ee8d4addf02a8?name=F01_20170807T163326Z_RA007716.JPG&allowOpen=True Aerial image showing example of ground control point used for the UAS surveys. JPEG Microsoft Windows 10, Trimble Access, Trimble Business Center. No formal attribute accuracy tests were conducted. No formal logical accuracy tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a single GPS base station concurrently occupying a nearby benchmark with published horizontal coordinates relative to the North American Datum of 1983. The horizontal positions of the geodetic reference network meet first-order specifications established by the National Geodetic Survey with a horizontal accuracy of 2 cm or better. Manufacturer reported accuracy for the differentially corrected horizontal positions for the GNSS rover is 0.8 cm + 1 ppm. Baselines from the GNSS base station varied between 0.8 km and 5.8 km with a mean of 2.8 km, suggesting the average horizontal accuracy of rover positions to be about 1 cm. Combining the uncertainty in the benchmark and rover yields a total uncertainty of 3 cm. Uncertainty in the horizontal positions associated with tripod centering, antenna height measurement errors, and errors from the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent rebound of the center of the tarp after removal is unknown. GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a single GPS base station concurrently occupying a nearby benchmark with published vertical coordinates relative to the North American Datum of 1983. The vertical positions of the geodetic reference network meet 2 cm local ellipsoid height specifications established by the National Geodetic Survey. Manufacturer reported accuracy for the differentially corrected vertical positions for the GNSS rover is 1.5 cm + 1 ppm. Baselines from the GNSS base station varied between 0.8 km and 5.8 km with a mean of 2.8 km, suggesting the average vertical accuracy of rover positions to be about 1.8 cm. Combining the uncertainty in the benchmark and rover yields a total uncertainty of 3.8 cm. Uncertainty in the vertical positions associated with tripod centering, antenna height measurement errors, and errors from the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent rebound of the center of the tarp after removal is unknown. Ground control was established using ground control points (GCPs) consisting of a combination of small square tarps with black-and-white cross patterns and temporary "X" marks placed with chalk on the ground surface throughout the survey area. The GCP positions were measured using either real-time kinematic (RTK) or post-processed kinematic (PPK) GPS, using corrections from GPS base stations located near the survey area. For each GCP measurement the GPS receiver was placed on a fixed-height tripod and set to occupy the GCP for a minimum occupation time of one minute. Post-processing was conducted using the Trimble Business Center software package. 201708 Joshua Logan U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7519 jlogan@usgs.gov The metadata title was modified to move the data collection month and year to the beginning of the title. This was done to meet new system requirements as ScienceBase is migrated to a new platform, and to keep datasets grouped by collection date on the new data release landing page.(20260323). 20260323 Manda Au U.S. Geological Survey Data Management Specialist Mailing

2885 Mission Street

Santa Cruz CA 95060 831-460-7575 mau@usgs.gov Point Point 68 State Plane Coordinate System 1983 4602 47.33333 45.83333 -120.50000 45.33333 500000.0 0.0 row and column 0.001 0.001 meters North American Datum of 1983 (EPSG:4269) GRS 1980 (EPSG:7019) 6378137.0 298.257222101 North American Vertical Datum of 1988 (EPSG:5703), derived using GEOID12B 0.001 meters Explicit elevation coordinate included with horizontal coordinates Attribute Table Table containing attribute information associated with the dataset Producer defined pid Point ID producer defined A unique identification code for the point. northing_m Northing coordinate of data point relative to the North American Datum of 1983, projected in Washington State Plane, South (zone 4602) coordinate system, in units of meters (EPSG:32149) Producer defined 102644.840 113293.869 meters easting_m Easting coordinate of data point relative to the North American Datum of 1983, projected in Washington State Plane, South (zone 4602) coordinate system, in units of meters (EPSG:32149) Producer defined 224161.840 230257.288 meters orthometric_ht_m Orthometric height of data point in meters relative to the North American Vertical Datum of 1988 (EPSG:5703), derived using the National Geodetic Survey GEOID12B. Producer defined 0.578 7.025 meters latitude_dd Latitude in decimal degrees, relative to the North American Datum of 1983 (EPSG:4269). Producer defined 46.20298168 46.29648156 decimal degrees longitude_dd Longitude in decimal degrees, relative to the North American Datum of 1983 (EPSG:4269). Producer defined -124.07881931 -123.99639056 decimal degrees ellipsoid_ht_m Ellipsoid height in meters, referenced to the GRS 1980 ellipsoid (EPSG:7019). Producer defined -23.902 -17.124 meters The first row of the csv file is a header line. Each following row represents one ground control point. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov The GCP locations are available in a comma-delimited text format. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. comma-delimited text The csv file contains coordinates of ground control point locations. No compression applied 0.005 https://www.sciencebase.gov/catalog/file/get/64384d99d34ee8d4addf02a8?name=FortStevens_BensonBeach_2017-08_GCP_positions.csv https://www.sciencebase.gov/catalog/item/64384d99d34ee8d4addf02a8 https://doi.org/10.5066/P9BVTVAW Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to the comma-delimited text file. The second link points to a landing page with the comma-delimited text file, metadata, and a browse image. The third link points to the landing page for the entire data release, including links to pages of the various data files. None. The downloadable data file is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel. 20260323 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998