Topography data from the Elwha River delta, Washington, July 2015
Dataset Identification:
Resource Abstract:
This portion of the USGS data release presents topography data collected during surveys performed on the Elwha River delta,
Washington, in July 2015 (USGS Field Activity Number 2015-648-FA). Topography data were collected on foot with global navigation
satellite systems (GNSS) equipment mounted on backpacks operating primarily in Real-Time Kinematic (RTK) mode. A total of
5 GNSS backpacks, each equipped with a dual-frequency GNSS receiver and handheld data collector, were used during the survey.
Differential corrections were transmitted at 1-Hz intervals by a VHF radio to the backpack GNSS receivers from a GNSS base
station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983
(CORS96 realization) and North American Vertical Datum of 1988.<br> <br> Prior to data collection, vertical distances between
the GNSS antenna and the ground were measured using a tape measure for each topographic surveyor. Hand-held data collectors
were used to log raw data and display navigational information allowing surveyors to navigate along predefined survey lines
spaced at 25- to 50-m intervals along the delta. Profiles were surveyed from the landward edge of the primary dune over the
beach foreshore, to wading depth on the same series of transects as nearshore bathymetric surveys that were conducted during
the same time period. Additional topography data were collected between transects to better characterize morphologic
variability within the study area. <br> <div> <div>The estimated vertical uncertainty of the topographic measurements
is 5 cm. The final point data are provided in comma-separated text format and are projected in Cartesian coordinates
using the Washington State Plane North, meters coordinate system.</div> </div>
Citation
Title Topography data from the Elwha River delta, Washington, July 2015
Title Marine Realms Information Bank (MRIB) Keywords
revision Date
2017-08-01
Theme
Keywords
GPS (Global Positioning System)
thesaurus name >
Title Global Change Master Directory (GCMD)
revision Date
2017-08-01
Place
Keywords
Olympic Peninsula
Strait of Juan de Fuca
Elwha River
thesaurus name >
Title Geographic Names Information System (GNIS)
revision Date
2017-08-01
Place
Keywords
Clallam County
purpose:
Data were obtained to assess the coastal geomorphic response following the removal of two dams on the Elwha River. 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 and shallow-water bathymetric features.