DOI: 10.5061/dryad.n02v6wx1b
title: Shoreline survey data collected at Hobuck, Tsoo-Yess, and Ozette, on Makah Tribal Lands, 2018–2022

description: Survey grade location and elevation data were collected on three beaches
 on the Makah Tribe's lands on the northwest tip of the Olympic
 Peninsula between 2018 and 2022 for the purpose of evaluating trends and
 patterns in shoreline morphology. Data were collected with an RTK-DGPS
 system, connected to the Washington State Virtual Reference Network and
 providing sub-decimeter vertical precision, along cross-shore oriented
 transects on Hobuck, Tsoo-Yess beaches, and on the shoreline fringing the
 Ozette reservation. During some surveys, oblique photos of the shoreline
 were also collected, frequently from near the average low tide elevation
 looking landward, but in some cases, from other elevations or with other
 perspectives of the beach.  Text files for each survey date are
 provided here, containing all points collected during the survey.
 Horizontal positions are provided in latitude and longitude, referenced to
 NAD83(2011), and the vertical data are referenced to meters relative to
 NAVD88(Geoid18). All survey data were collected either with the GNSS
 system mounted on a 2.05 m rover pole, held level as a transect line was
 traced in a cross-shore orientation on the beach, or with the system
 mounted on a survey backpack.   The associated text
 files include the horizontal (HRMS) and vertical (VRMS) root-mean-square
 errors estimated by the GNSS system, the date and time of collection
 (referenced to local Pacific time), as well as the RTK-DGPS status
 reported by the GNSS system at the time each point was collected. The
 description assigned to each point at the time of collection is also
 provided. Most data in these files are intended to be used to calculate
 beach profiles and assigned a "topo" designator in the text
 file, but other data descriptions were assigned in some cases, notably the
 location and number of large pieces of wood intersecting a profile, the
 first occurrence of vegetation on a profile, the first occurrence of dense
 vegetation on a profile, or in some instances the location of storm wrack
 lines observed during surveys.
description: Data were collected using GNSS survey methods, with a
 differential GPS operating in Real Time Kinematic (RTK) mode. All data
 were collected with either an AshTech ProMark 200 or an iGage IG8 RTK-DGPS
 system connected to the Washington State Reference Network. Horizontal
 positions are referenced to NAD83(2011), and the vertical data are
 referenced to NAVD88(Geoid18). All survey data were collected with the
 GNSS system mounted on a 2.05 m rover pole, held level as a transect line
 was traced in a cross-shore orientation on the beach, or mounted on a
 backpack worn by a walking surveyor. The horizontal position of each
 survey point was initially exported from the survey controller in
 Washington State Plane Zone North metric coordinates, but converted to
 latitude and longitude using Andrew Steven's sp_proj in Matlab R2022a
 (available at SP_PROJ - File Exchange - MATLAB Central (mathworks.com)) The associated text files include the horizontal (HRMS) and vertical (VRMS) root-mean-square errors estimated by the GNSS system, as well as the RTK-DGPS status reported by the GNSS system at the time each point was collected. Times are referenced to local Pacific time (either PST or PDT). Most data in these files are intended to be used to calculate beach profiles, but other data types were collected during each survey: The location of the most seaward presence of large wood on the profile.  The number of large pieces of wood intersecting the transect was also logged as a description attribute for that point. The location of the most seaward presence of vegetation, and the location of the most seaward location of a vegetation line (vegetation coverage &gt; 50%). Location of storm-deposited debris (typically large and small wood) encountered in dunes. Additionally, digital photographs of the beach collected during each survey are also available in this archive.
description: Data as presented can be easily visualized in a GIS.  To convert
 the survey data into profile views a transect origination point is
 necessary.  Those are available in a table in the project report included
 in the archive.