Bathymetry from multibeam echosounder data collected offshore of Point Buchon, California
This part of USGS Data Series 781 (Golden, 2019) presents 2-m-resolution bathymetry data for the Offshore of Point Buchon, California, map area. Bathymetry data were collected by Fugro Pelagos in 2008 using a combination of 400-kHz Reson 7125, 240-kHz Reson 8101, and 100-kHz Reson 8111 multibeam echosounder systems. The data were post-processed by the California State University Monterey Bay Seafloor Mapping Lab and the University of California Santa Cruz Center for Integrated Spatial Research. The bathymetry data are available as a georeferenced TIFF image.
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Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
Kvitek, Rikk, Cole, Aaron, and Cochrane, Guy R., 20220813, Bathymetry from multibeam echosounder data collected offshore of Point Buchon, California: data release DOI:10.5066/P9KBGELE, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.
Cochrane, Guy R., Cole, Aaron, and Sherrier, Meghan, 2022, Bathymetry, backscatter intensity, and benthic habitat offshore of Point Buchon, California: data release DOI:10.5066/P9KBGELE, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 10.0
Ordinates (y-coordinates) are specified to the nearest 10.0
Planar coordinates are specified in Meters
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_844.
The semi-major axis of the ellipsoid used is 6378137.00.
The flattening of the ellipsoid used is 1/298.257223563.
The surveys were conducted to map surficial geology and benthic habitat as part of the USGS California Seafloor Mapping Program (CSMP), a collaboration with California State University Monterey Bay (CSUMB) and the National Oceanic and Atmospheric Administration (NOAA). These data are intended to provide regional bathymetric information in California State waters for offshore resource and ecosystem management. These data are also intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to help identify geomorphologic features and surficial lithology. These data are not intended to be used for navigation.
Multibeam echosounder (MBES) data were collected by Fugro Pelagos in 2008 using a combination of 400-kHz Reson 7125, 240-kHz Reson 8101, and 100-kHz Reson 8111 multibeam echosounder systems. An Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to accurately position the vessels during data collection, and it also accounted for vessel motion such as heave, pitch, and roll, with navigational input from GPS receivers. Smoothed Best Estimated Trajectory (SBET) files were postprocessed from logged POS-MV files. Sound-velocity profiles were collected with an Applied Microsystems (AM) SVPlus sound velocimeter. Soundings were corrected for vessel motion using the Applanix POS-MV data, for variations in water-column sound velocity using the AM SVPlus data, and for variations in water height (tides) and heave using the postprocessed SBET data (California State University, Monterey Bay, Seafloor Mapping Lab, 2016). The raw bathymetry data were processed into mosaics using Caris HIPS. The bathymetry mosaics were then exported as two georeferenced TIFF images, a 2-meter resolution image for depths less than 80 meters and a 5-meter resolution image for deeper areas. The images were subsequently mosaiced into a single 2-meter resolution image for this data release.
Date: 2022 (process 2 of 2)
The 2-m-resolution bathymetry images were mosaiced and clipped into a single geotiff mosaic for the study area by the University of California Santa Cruz Center for Integrated Spatial Research using ArcGIS 10.
How accurate are the heights or depths?
Estimated to be no less than 20 cm, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey, the California State University Monterey Bay Seafloor Mapping Lab, and the University of California Center for Integrated Spatial Research as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
The downloadable data file has been compressed with the Windows 10 "zip" command and can be unzipped using Windows File Explorer or with Winzip (or other tools). To utilize these data, the user must have software capable importing and viewing a GeoTIFF file.