Reference marks, walking GPS surveys, CoastCam GCPs, and instrument location data in Pea Island National Wildlife Refuge, North Carolina in November 2020, April, September, and October 2021

Two PK nail reference marks, for use in QA/QC and keeping the base station in a consistent location for the length of the field activity, were established in the parking lot of the Pea Island National Wildlife Refuge boat launch. Each nail was occupied with the SP80 base station tripod for at least two hours three times. GPS location data from the SP80 was converted to RINEX using RINEX Converter v 5.0.8 (https://spectrageospatial.com/survey-office/) and parsed in teqc (https://www.unavco.org/software/data-processing/teqc/teqc.html, accessed February 2021) to be uploaded to OPUS (https://www.ngs.noaa.gov/OPUS/) at least 48 hours after collection date. OPUS solutions are provided as plain text documents in the zip folder 2021029FA_PINWR_ReferencemarkSolutions.zip that provide the location of the reference marks.

Over the field activity, the SP80 equipment was used to take the location information of stationary targets and equipment installed at the field site. At the end of the field activity all GPS points were corrected to the OPUS solution averages of the reference marks by shifting the XYZ in Carlson SurvCE v. 6.08 (https://www.survce.com/home, accessed August, 2021). A Garmin hand-held GPS was used to get the general location of equipment installed in the water.
Ground control points for the Helikite surveys (see larger citation Structure from Motion Data) were either black and white square plastic tarps with a number on them or AeroPoint yellow and black targets that were replaced every survey – a random letter was used for each survey to distinguish between surveys that used the same GCPs. The stationary targets were small black and white square nylon targets that were staked in place. On 2021-09-18, five plywood targets painted black and white were propped up in front of the CoastCam, a setup of two video cameras in stereo mounted on two poles on the dune (https://www.usgs.gov/media/images/coast-cam-installed-dune-overlooking-dunex-field-site), and the intersection of the targets black and white line with the sand was surveyed with the SP80.
The static GPS data is provided in two CSVs for: (1) Stationary tarps and plywood targets used for calibration of the CoastCam and (2) locations of the cross-shore poles and equipment installed for the DUNEX field activity.

Kinematic GPS data was also taken throughout the field activity. The SP80 or JAVAD equipment was used to take GPS points on a continuous setting as the equipment was walked in the field sites. At the end of the field activity all RTK GPS points were corrected to the OPUS solution averages of the reference marks by shifting the XYZ in Carlson SurvCE v. 6.08 (https://survece.com/home, accessed August, 2021). The PPK GPS data was processed in Inertial Explorer (v. 8.70.8722).
GPS walking data was then packaged by the survey date and provided as CSV files in the zip folder PINWR_GPS_walkingSurveys.zip.