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Gulf of the Farallones Seafloor Mapping:Regional Bathymetry and Sidescan-Sonar Digital Mosaics

[Gulf of the Farallones: Seafloor Shaded Relief Image] The availability and use of remotely sensed digital image data have increased rapidly over the last two decades. One application where remotely sensed image data are becoming a critical component is that of environmental analysis and monitoring. As an example, USGS partnered with the Gulf of the Farallones National Marine Sanctuary to use remotely sensed sidescan-sonar images to detect and map the location of 55-gallon drums that were dumped near and around the Farallon Islands from 1946 until 1970. Approximately 48,000 drums containing low-level radioactive waste were dumped in water depths ranging from about 100 to 2,500 meters covering an area of at least 1,400 sq. km (Karl et al., 1994). Because of the high number of drums littering the seafloor and the large disposal area involved, remotely sensed image data are one of the few promising tools for detecting and mapping barrel locations.

Full Report:

Visit the Gulf of the Farallones Regional Bathymetry and Sidescan-Sonar Digital Mosaics web page for a full report and imagery.

Imagery

Shaded relief, anaglyph 3D stereo, bathymetry, and sidescan-sonar.

Related Internet Resources

USGS: Gulf of the Farallones Disposal Issues
USGS: Gulf of the Farallones Atlas
USGS Coastal & Marine Geology Program
Central California Internet Resources


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Last Modified: Thu Oct 31 15:08:21 MST 2002		FirstGov: Your First Click to the U.S. Gov ernment