Title:Sediment thickness--Santa Barbara Channel, California Abstract:
This part of DS 781 presents data for the sediment-thickness map of the Santa Barbara Channel, California, region. The raster data file is included in "SedimentThickness_SantaBarbaraChannel.zip," which is accessible from https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html.
As part of the USGS's California Seafloor Mapping Program, a 50-m grid of sediment thickness atop the bedrock at the Last Glacial Maximum horizon for the seafloor within the 3-nautical-mile limit of California's State Waters from the Offshore of Refugio Beach map area to the Hueneme Canyon and vicinity map area was generated from seismic-reflection profile data, collected in 2007 and 2008 (USGS activities Z-3-07-SC and S-7-08-SC), supplemented with outcrop and geologic structure data from DS 781. The resulting grid covers an area of approximately 600 sq km. Sediment thickness contours (isopachs) at 2.5-meter intervals were derived from this grid and are also available in this data release
Additional information about the field activities from which this data set was derived are available online at:
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 50.000000
Ordinates (y-coordinates) are specified to the nearest 50.000000
Planar coordinates are specified in meters
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
These data are intended for science researchers, students, policy makers, and the general public. This information is not intended for navigational purposes.The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.
U.S. Geological Survey (USGS), Coastal and Marine Geology Program (CMGP), 2007, Seismic-reflection data acquisition data of field activity Z-3-07-SC in Santa Barbara Channel region: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG), Menlo Park, CA.
Type_of_Source_Media:ASCII lat/long shot point files Source_Contribution:
Digital seismic data used to interpret subsurface geologic structure
S-7-08-SC (source 2 of 2)
U.S. Geological Survey (USGS), Coastal and Marine Geology Program (CMGP), 2013, Seismic-reflection data acquisition data of field activity S-7-08-SC in Santa Barbara Channel region: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG), Menlo Park, CA.
Chirp and sparker seismic-reflection data from USGS field activity Z-3-07-SC and chirp data from field activity S-7-08-SC were imported to SEISWORKS. (Ray Sliter, email@example.com)
Date: 2011 (process 2 of 5)
Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson, firstname.lastname@example.org)
Date: 2011 (process 3 of 5)
Data exported and converted with 1,500 m/sec velocity in water and 1,600 m/sec velocity in sediment. (Ray Sliter, email@example.com).
Date: 2011 (process 4 of 5)
X, Y locations and sediment thickness value Z imported to ArcGIS format as points, interpolated to preliminary surface with TopoRaster. Supplemental manually generated contours were combined for secondary calculation. Final surface treated as grids separated by the Oak Ridge Fault, then recombined. (Florence Wong, firstname.lastname@example.org; Eleyne Phillips, email@example.com)
Date: 28-Mar-2023 (process 5 of 5)
Metadata was modified to bring up to current USGS PCMSC standards. USGS Thesaurus and keywords were added, added keywords section with USGS persistent identifier as theme keyword, Point of Contact and Metadata Contact information was updated, and Process Steps were refined. Information about the data available for download and different Network Resource Name links and details were given in the Standard Order Process section. Minor typos were corrected. No data information was changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent.
Person who carried out this activity:
Susan A Cochran
U.S. Geological Survey, Pacific Coastal and Marine Science Center
How well have the observations been checked?
Data points are approximately 1 m apart along tracklines and 1,000-2,000 m apart between tracks. 50-m cell size for interpolation is better supported along track than between.
How accurate are the geographic locations?
The chirp sonar instrument is deployed under the research vessel with about 10 m of variation in position. The sparker position may vary as much as 20 m from the navigation reference on the vessel.
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 as the originator(s) 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 "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap TIFF. Users should download the ArcGIS Project File, SantaBarbaraChannelGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for the Santa Barbara Channel region, and has all the data symbolized as on the map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.