Open-File Report 2011–1226
Bathymetry and Acoustic Backscatter—Elwha River Delta, Washington
Geodetic control for the survey was established using a shore-based Global Positioning System (GPS) base station broadcasting real-time kinematic (RTK) corrections to the survey vessel by UHF radio link. The base station was located at the base of Ediz Hook (fig. 1). The base station was programmed using the WGS84 (G1150) reference frame with an Epoch of 2010.1548. Average National Geodetic Survey Opus Solution coordinates for the station are shown in table 2. Post-processed analysis of the base station coordinates using the precise ephemeris data showed the base station broadcast coordinates were in error by approximately -0.00007" in latitude, +0.00011" in longitude and +0.004m in height. These values are insignificant compared to the positional uncertainty of the vessel and sonar system and were neglected (see Data Processing for details).
If you have trouble reading these tables, please contact the WCMG team.
For more information, contact the PCMSC team.