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Ventura Santa Barbara Morro Bay Orange County Los Angeles County North San Diego San Diego South Channel Islands SoCal Map
Lat/Lon/Depth zipped data file (2.77 MB)
Fledermaus iView3D zipped .sd file (2.24 MB)
Click on a region to view its bathymetry map

3 arc-second grid resolution ~ Apprx. 90m horizontal resolution. Elevation in meters.

To view the iView4D .sd files, you will need to download the iView4D viewing software which is provided free-of-charge from their website (registration required).

Additionally, you may also download our Google Earth .kmz file containing rasterized bathymetry images.

Data provided by: The National Geophysical Data Center (NGDC)
Visualization by: The Scripps Institution of Oceanography's Visualization Center

Metadata for the regions is available here.

How to Cite These Data:

Divins, D.L., and D. Metzger, NGDC Coastal Relief Model, Retrieved date goes here, Download provided by the Southern California Coastal Ocean Observing System

3 Arc-Second Coastal Relief Model Development

Currently, the soundings used to create the East Coast grids are referenced to two vertical datums and various horizontal datums. The vertical datums are mean low water (89% of the surveys) and mean lower low water (11%) of the surveys). The primary horizontal datums used were the NAD27 ellipsoid for soundings collected up until 1987-88, and the NAD83 ellipsoid for soundings collected since then. Despite their lack of uniformity, the different horizontal and vertical datums do not significantly alter the accuracy of the East Coast grids. This is because there is little difference in elevation between mean low water and mean lower low water in the gridding region, and the horizontal differences between the ellipsoids is less than the horizontal resolution of the cells within the grids (i.e.,<90m).

Alternate Sources of Bathymetry Data

  • Multibeam Bathymetry and Selected Perspective Views Offshore San Diego, California By Peter Dartnell, William R. Normark, Neal W. Driscoll, Jeffrey M. Babcock, James V. Gardner, Rikk G. Kvitek, and Pat J. Iampietro
  • U.S. Geological Survey mapped from the La Jolla Canyon south to the US-Mexico border using a Kongsberg Simrad multibeam echosounder system (MBES) (March - April 1998). Data and metadata available at
  • Woods Hole Oceanographic Institution and SCRIPPS Institution of Oceanography mapped the majority of the La Jolla Fan Valley including the sea floor to the north and south of the valley using a Seabeam 2100 MBES. Data available at Survey ID, AT07L09, Chief Scientists, Barrie Walden and Joseph Coburn (April 2002).
  • California State University, Monterey Bay, mapped Scripps Canyon and the head of La Jolla Canyon using a Reson 8101 MBES (October 2001). Data and metadata available at This work was funded by the California Department of Fish and Game
  • California Coastal Conservancy, San Diego Association of Governments (SANDAG), California Department of Fish and Game, and Fugro Pelagos mapped the nearshore region out to about 35-40 m.
  • The sea floor within this image that has not been mapped with MBES is filled in with interpreted bathymetry gridded from single-beam data available at Depths are in meters below sea level, which is referenced to Mean Lower Low Water.
SoCal Map