Nearshore Canyon Experiment Bathymetry/Topography
Data Sources
1. NOS (1936, 1972)
NOAA National Ocean Survey (NOS) data for the La Jolla region.
Provides complete survey
coverage of the NCEX region to roughly the 5m depth contour, and
is used where no recent survey data exists.
2. RACAL (2001)
Commercial swath survey of both the north and south canyon branches.
3. NEW HORIZON (2001)
Partial swath survey of canyons by Christian DeMoustier at SIO.
The offshore portion of this survey follows the canyon axis after
the two branches of the canyon merge.
The shoreward portion overlaps
with the RACAL survey over the two canyon branches.
4. CBASS (2001)
DGPS waverunner survey of the nearshore bathymetry, and land dolly survey
of the beach areas. Overlaps with the shoreward end of the RACAL survey
in the water, and the NASA ATM lidar survey on land.
5. NASA ATM (1998)
Surface contouring lidar data from NASA/USGS. It covers the beach
and cliff areas. Overlaps with CBASS land dolly data. Only elevations
above 0.5m are used to eliminate water surface points.
All data has been converted to the following coordinate system:
Horizontal Data Convention: Latitude and Longitude (WGS84)
Vertical Data Convention: meters from MSL. Water depths are positive, land elevations are negative.
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FUTURE DATA
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1. CBASS survey of southern edge of the north canyon head. This would
fill in a small area that is poorly surveyed to date.
2. U. Texas lidar survey of beach and cliffs (May 2002). Would update
NASA ATM data.
3. SHOALS survey (land and shallow water depths to 15m, Summer 2002).
This may fill in the missing or old shallow water data north and south
of the CBASS data.