Offshore sediment thickness data in California State Waters between Refugio and Hueneme Canyon, California (sbsedthkpt).

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Frequently anticipated questions:

What does this data set describe?

Title:
Offshore sediment thickness data in California State Waters between Refugio and Hueneme Canyon, California (sbsedthkpt).
Abstract:
As part of the USGS's California State Waters Mapping Project, sediment thickness for the seafloor within the 3-nautical mile limit between Gaviota and Hueneme Canyon was extracted from seismic-reflection data collected in 2007 (USGS activity (Z-3-07-SC) and 2008 (S-7-08-SC). Sediment thickness ranges from 0 to 65 m with a mean of 12 m and a standard deviation of 15 m.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at
https://cmgds.marine.usgs.gov/activity_info.php?fan=z307sc https://cmgds.marine.usgs.gov/activity_info.php?fan=s708sc
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 Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Wong, Florence L., Phillips, Eleyne L., Johnson, Samuel Y., and Sliter, Ray W., 2012, Offshore sediment thickness data in California State Waters between Refugio and Hueneme Canyon, California (sbsedthkpt).: Open-File Report 2012-1161, U.S. Geological Survey, Menlo Park, California.

    Online Links:

    This is part of the following larger work.

    Wong, Florence L., Phillips, Eleyne L., Johnson, Samuel Y., and Sliter, Ray W., 2012, Modeling of depth to base of Last Glacial Maximum and seafloor sediment thickness for the California State Waters Map Series, eastern Santa Barbara Channel, California: Open-File Report 2012-1161, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -120.206232
    East_Bounding_Coordinate: -119.123028
    North_Bounding_Coordinate: 34.492447
    South_Bounding_Coordinate: 34.027787
  3. What does it look like?
    sbsedthkpt.jpg (JPEG)
    map of sediment thickness points rendered by color
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2007
    Ending_Date: 2009
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (924661)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. 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.
  7. How does the data set describe geographic features?
    sbsedthkpt
    sediment thickness at point locations (Source: this study)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    SEDTHKPTLL
    line number in Seisworks export file (Source: none) line numbers in file
    X_UTM1184
    X-coordinate in UTM zone 11 coordinates (Source: standard usage) Coordinates defining the features.
    Y_UTM1184
    Y-coordinate in UTM zone 11 coordinates (Source: standard usage) Coordinates defining the features.
    THK_M
    sediment thickness THK_M0 <= 0.1 increased to 0.1 (Source: this study) sediment thickness value
    THK_M0
    sediment thickness in meters as exported from Seisworks (Source: ESRI) sediment thickness value
    LONG84
    x-coordinate (longitude) in geographic coordinates, WGS84 (Source: standard usage) Coordinates defining the features.
    LAT84
    Y-coordinate (latitude) in geographic coordinates, WGS84 (Source: standard usage) Coordinates defining the features.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Florence L. Wong
    • Eleyne L. Phillips
    • Samuel Y. Johnson
    • Ray W. Sliter
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2011 (process 1 of 9)
    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, rsliter@usgs.gov)
    Date: 2011 (process 2 of 9)
    Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson, sjohnson@usgs.gov)
    Date: 2011 (process 3 of 9)
    Data exported and converted with 1500m/sec velocity in water and 1600 m/sec velocity in sediment. (Ray Sliter, rsliter@usgs.gov).
    Date: 2011 (process 4 of 9)
    X, Y locations and sediment thickness value Z imported to ArcGIS format as points (Florence Wong, fwong@usgs.gov)
    Date: 09-Jun-2011 (process 5 of 9)
    Metadata imported. Data sources used in this process:
    • Q:\sbsedthk\metadata\covsfinal\sedthick\metadata.xml
    Date: 09-Jun-2011 (process 6 of 9)
    Metadata imported. Data sources used in this process:
    • d:\TEMP\xml257.tmp
    Date: 17-Jul-2018 (process 7 of 9)
    Corrected Larger_Work section of metadata so that each author had a separate originator tag Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geologist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7545 (voice)
    scochran@usgs.gov
    Date: 19-Oct-2020 (process 8 of 9)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 21-Oct-2021 (process 9 of 9)
    Edited metadata to add USGS Thesaurus keywords and perform minor edits to bring the metadata up to current PCMSC standards. No data were 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:
    U.S. Geological Survey
    Attn: Susan Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data points are approximately 1 m apart along tracklines and 1000-2000 m apart between tracks.
  2. How accurate are the geographic locations?
    The chirp sonar instrument is deployed under the research vessel with about 10m of variation in position. The sparker position may vary as much as 20m from the navigation reference on the vessel.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All points exported from Seisworks present
  5. How consistent are the relationships among the observations, including topology?
    Point features present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None.
Use_Constraints: Not to be used for navigation.
  1. Who distributes the data set? (Distributor 1 of 1)
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Attn: Florence L. Wong
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data. USGS OF 2012-1161
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 21-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/SeriesReports/OFR/OFR_2012-1161/sbsedthkpt.faq.html>
Generated by mp version 2.9.50 on Fri Oct 22 09:18:53 2021