Elwha River Delta, Washington, Acoustic Backscatter (Cruise ID: S-6-10-PS)

Title:: Elwha River Delta, Washington, Acoustic Backscatter (Cruise ID: S-6-10-PS)
Abstract:: Between February 22, 2010 and March 3, 2010 the U.S. Geological Survey, Pacific Coastal and Marine Science Center mapped the bathymetry and acoustic backscatter of the Elwha River Delta, Strait of Juan de Fuca, Washington State. In addition to the main survey, 3 small surveys of interest to USGS partners were conducted on February 26, 2010. The first is the area surrounding the abandoned Rayonier Pier site in Port Angeles Harbor, the second is a former log-storage facility on the southern side of Ediz Hook near the Port Angeles Coast Guard station. Both of these smaller surveys were conducted during a weather day where sea conditions were too rough for surveying outside the harbor breakwaters. In addition, several lines of data were collected on the outer face of Ediz hook as the vessel transited to and from the Elwha river delta to inspect failure features along the northen edge of Ediz Hook first observed in 2005 during USGS cruise K-1-05-PS.
The surveys were conducted using the research vessel R/V Parke Snavely outfitted with an interferometric sidescan sonar for swath mapping and Real-Time Kinematic navigation equipment for accurate shallow water operations.
Supplemental_Information:: The URL for USGS field activity S-6-10-PS is <http://walrus.wr.usgs.gov/infobank/s/s610ps/html/s-6-10-ps.meta.html> The URL for USGS field activity K-1-05-PS is <http://walrus.wr.usgs.gov/infobank/k/k105ps/html/k-1-05-ps.meta.html>

Data format:	The ASCII file consists of header information containing a set of keywords, followed by cell values in row-major order. The file format is: <NCOLS xxx> <NROWS xxx> <XLLCENTER xxx \| XLLCORNER xxx> <YLLCENTER xxx \| YLLCORNER xxx> <CELLSIZE xxx> {NODATA_VALUE xxx} row 1 row 2 . . . row n where xxx is a number, and the keyword nodata_value is optional and defaults to -9999. Row 1 of the data is at the top of the grid, row 2 is just under row 1 and so on. The nodata_value is the value in the ASCII file to be assigned to those cells whose true value is unknown. In the grid they will be assigned the keyword NODATA. Cell values are be delimited by spaces. No carriage returns are necessary at the end of each row in the grid (although they are included in this case). The number of columns in the header is used to determine when a new row begins. The number of cell values is equal to the number of rows times the number of columns. in format ESRI ASCII Grid (version 1.0) Size: 381 MB
Network links:	<https://pubs.usgs.gov/of/2011/1226/>

Data format:

The ASCII file consists of header information containing a set of keywords, followed by cell values in row-major order. The file format is:


<NCOLS xxx>
<NROWS xxx>
<XLLCENTER xxx | XLLCORNER xxx>
<YLLCENTER xxx | YLLCORNER xxx>
<CELLSIZE xxx>
{NODATA_VALUE xxx}
row 1
row 2
.
.
.
row n

where xxx is a number, and the keyword nodata_value is optional and defaults to -9999. Row 1 of the data is at the top of the grid, row 2 is just under row 1 and so on. The nodata_value is the value in the ASCII file to be assigned to those cells whose true value is unknown. In the grid they will be assigned the keyword NODATA. Cell values are be delimited by spaces. No carriage returns are necessary at the end of each row in the grid (although they are included in this case). The number of columns in the header is used to determine when a new row begins. The number of cell values is equal to the number of rows times the number of columns. in format ESRI ASCII Grid (version 1.0) Size: 381 MB

Network links:

<https://pubs.usgs.gov/of/2011/1226/>

Elwha River Delta, Washington, Acoustic Backscatter (Cruise ID: S-6-10-PS)

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