Nearshore Canyon Experiment Bathymetry and Topography
Bathymetry and Topography for the nearshore canyon experiment area
has been obtained
from different sources. The data have been combined into a
uniform grid for use by NCEX investigators. This
grid will evolve over time as new bathymetry data are obtained
or errors are corrected. The purpose of this web page is to
describe the data sources and gridding process,
and provide updated grid files with documented changes.
With each grid update, the data files will be assigned a new
version number, and will be referred to by a progressing
grid number: Grid 1, Grid 2, etc. The grid data are provided
in several formats and these will remain consitent with
each update of the grid data. Additional grids
may be added over time if needed or desired.
The initial grid, created by Mark Orzech at NPS and distributed
by Steve Elgar through May 2002, is "NCEX GRID 1".
Horizontal Data Convention: Latitude and Longitude (WGS84)
Vertical Data Convention: meters from MSL. Water depths are positive, land elevations are negative.
The Bathymetry Grids
Grid format description and code to read/view grids.
1.NCEX Grid 1. Original grid by Mark Orzech at NPS.
2.NCEX Grid 2. Created July 2002.
Removes numerous
data outliers and adds coastal land elevations.
3.NCEX Grid 3. Created April 2003.
Adds additional
CBASS survey data around the south branch of the north canyon head, SHOALS
data in shallow water south of SIO pier, and USGS swath survey data for
the deep portion of the canyon offshore.
4.NCEX Grid 4. Created August 29, 2003.
Updates shallow water bathymetry from SIO pier northward past
Blacks using
CBASS August 20-22, 2003 mini-grid survey data.
Description of data sources.
Description of the gridding process.