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Seafloor mapping and benthic habitat GIS for southern California, volume III

January 15, 2008

From August 8-27, 2005, more than 75 km of the continental shelf (Fig. 1) in water depths of 20-70m southeast of Santa Barbara, were surveyed during the USGS cruise S-1-05-SC (http://walrus.wr.usgs.gov/infobank/s/s105sc/html/s-1-05-sc.meta.html). Both Interferometric sonar and 14 hours of both vertical and oblique georeferenced submarine digital video were collected to (1) obtain geophysical data (bathymetry and acoustic reflectance), (2) examine and record geologic characteristics of the sea floor, and (3) construct maps of seafloor geomorphology and habitat distribution. Substrate distribution is predicted using a modified version of Cochrane and Lafferty (2002) video-supervised statistical classification of sonar data that includes derivatives of bathymetry data. Specific details of the methods can be found in the meatadata of the bathymetry data file. Substrates observed are predominantly sand with some rock. Rocky substrates were restricted primarily to an east-west trending bathymetric high 2,000 m north of oil platforms.

This is an updated report (version 2.0) from the earlier 2007-1271 (version 1.0) open-file report. This updated report re-releases the data files in UTM, zone 11, WGS84 coordinates. Also, the bathymetry data has been corrected for a vertical offset discovered in the earlier 2007-1271 (version 1.0) report.

Citation Information

Publication Year 2007
Title Seafloor mapping and benthic habitat GIS for southern California, volume III
DOI 10.3133/ofr20071271
Authors Guy R. Cochrane, Nadine E. Golden, Pete Dartnell, Donna M. Schroeder, David P. Finlayson
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2007-1271
Index ID ofr20071271
Record Source USGS Publications Warehouse
USGS Organization Coastal and Marine Geology Program