United States Geological Survey (USGS), 2005 XYZ http://pubs.usgs.gov/of/2005/1153/ci-data.html http://pubs.usgs.gov/of/2005/1153/ci-data.html/bathyxyz.zip Peter Dartnell Guy Cochrane Mary Elaine Dunaway 2005 1.0 Open-File Report 2005-1153 Western Coastal and Marine Geology, Menlo Park, CA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/of/2005/1153/ci-index.html XYZ ASCII format data generated from the 2004 multibeam sonar survey of the Northeastern Channel Islands, CA Region. The data include high-resolution bathymetry. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display bathymetry data of the Northeastern Channel Islands, CA Region. Information for USGS Coastal and Marine Geology related activities are online at < http://walrus.wr.usgs.gov/infobank/e/e104sc/html/e-1-04-sc.meta.html> 20040806 20040815 ground condition Complete As needed -119.72 -119.03 34.33 33.88 None Marine Geology Multibeam Bathymetry Water Depth Ocean Floor Topography elevation U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP ISO 19115 Topic Category oceans and estuaries imageryBaseMapsEarthCover None Santa Barbara Channel Channel Islands CA Southern California USA None Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Peter Dartnell United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Physical Scientist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5460 (650) 329-5411 pdartnell@usgs.gov Not determined. Point features present. Complete 0.5 meters 0.05 percent of the water depth. Depths corrected to mean lower low water datum. The multibeam bathymetry and acoustic backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam sonar system. The data are cleaned of bad navigation and depth readings and corrected for tides to mean lower low water datum using a predictive tide model. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command. The GRID was converted to an XYZ ASCII file by using the GRIDPOINT, ADDXY, and Tables' UNLOAD commands. 20041130 Peter Dartnell United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Physical Scientist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5460 (650) 329-5411 pdartnell@usgs.gov Point Point 0.00015 0.00015 Decimal degrees WGS84 WGS84 6378137.00 meters 0.003352811 Example of Bathymetry XYZ ASCII file > Longitude, Latitude, Depth > (decimal degrees, decimal degrees, meters) >-119.54763,33.72052,-132.661 >-119.54747,33.72052,-132.673 >-119.54731,33.72052,-132.684 >-119.54715,33.72052,-132.684 >-119.54699,33.72052,-132.684 >-119.54683,33.72052,-132.727 >-119.54668,33.72052,-132.764 >-119.54652,33.72052,-132.756 >-119.54636,33.72052,-132.739 none United States Geological Survey (USGS) Information Services mailing and physical address

345 Middlefield Rd., MS-999

Menlo Park CA 94025 USA (650)329-5460 E-1-04-SC data sets These data not intended for navigational purposes. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. ASCII none None 20050130 Peter Dartnell United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Physical Scientist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5460 (650) 329-5411 pdartnell@usgs.gov Content Standard for Digital Geospatial Metadata ("CSDGM version 2") FGDC-STD-001-1998 universal time