SEDDATA database

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Frequently-anticipated questions:

What does this data set describe?

Title: SEDDATA database
Abstract: No formal abstract is given.
Supplemental_Information:
Data were collected at least as early as 1958. Data digitized by the USGS for inclusion into usSEABED (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    University of Southern California, and Foundation, Allan Hancock , Unpublished material, SEDDATA database.

    Other_Citation_Details:
    Data collected by the University of Southern California (USC) under public funding provided by Donn Gorsline, 2001. Some data may overlap other USC publications held within usSEABED.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -121.16
    East_Bounding_Coordinate: -117.35
    North_Bounding_Coordinate: 37.18
    South_Bounding_Coordinate: 31.50

  3. What does it look like?

    USC_SEDDATA (.jpg)
    Sample distribution with coastline and bathymetry for reference.

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1958
    Ending_Date: 2000
    Currentness_Reference: 2001

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Digital

  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 (2180)

    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 0.00167. Longitudes are given to the nearest 0.00167. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    Point
    SDTS point (Source: Source database)

    USC Sta. #
    University of Southern California and/or Allan Hancock Foundation station number (Source: University of Southern California)

    Sequential alpha numeric code

    Water depth
    Water depth of sample (Source: Source database)

    Range of values
    Minimum:6
    Maximum:3530
    Units:Meters
    Resolution:1.0

    Gravel
    Gravel (Source: Source database)

    Range of values
    Minimum:0
    Maximum:97
    Units:Percent
    Resolution:1.0

    Sand
    Sand (Source: Source database)

    Range of values
    Minimum:0
    Maximum:100
    Units:Percent
    Resolution:1.0

    Silt
    Silt (Source: Source database)

    Range of values
    Minimum:0
    Maximum:91
    Units:Percent
    Resolution:1.0

    Clay
    Clay (Source: Source database)

    Range of values
    Minimum:0
    Maximum:60
    Units:Percent
    Resolution:1.0

    Mean
    Mean grainsize (Source: Source database; assumed first moment)

    Range of values
    Minimum:0.0
    Maximum:8.4
    Units:Phi
    Resolution:0.1

    Std. dev.
    Standard deviation of grainsize distribution (sorting) (Source: Source database; assumed second moment)

    Range of values
    Minimum:0.3
    Maximum:4.3
    Units:Phi
    Resolution:0.01

    Skew
    Skewness of grain size distribution (Source: Source database; assumed third moment)

    Range of values
    Minimum:-2.8
    Maximum:5.2
    Units:Unitless
    Resolution:0.1

    Kurt
    Kurtosis of grain size distribution (Source: Source database; assumed fourth moment)

    Range of values
    Minimum:-1.7
    Maximum:39.0
    Units:Unitless
    Resolution:0.1

    CaCO3
    CaCO3 in sample (Source: Source database)

    Range of values
    Minimum:0
    Maximum:91.0
    Units:Percent
    Resolution:0.1

    TOC
    Total organic carbon (Source: Source database)

    Range of values
    Minimum:0.0
    Maximum:21.1
    Units:Percent
    Resolution:0.1

    Bulk
    Bulk density of sample (Source: Source database)

    Range of values
    Minimum:0.6
    Maximum:2.0
    Units:g/cm3
    Resolution:0.1

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Students of USC for collecting and analyzing the data, agencies of local, state, and federal government for supplied funding for the data collection and analyses. Donn Gorsline (USC) compiled and supervised much of the data collection. For usSEABED, formatting and formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado).

  3. To whom should users address questions about the data?

    Donn S. Gorsline
    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213-740-5125 (voice)
    gorsline@earth.usc.edu

Why was the data set created?

To compile USC's sediment data

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: Unknown (process 1 of 1)
    Depends on year of analyses. Unknown procedures.

    Person who carried out this activity:

    Donn S. Gorsline
    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213- 740-5125 (voice)
    gorsline@earth.usc.edu

    Data sources produced in this process:
    • SEDDATA database

  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?

    No estimate made for the accuracy of the data in the original report. Data digitized by the USGS and partners were visually compared to the source data, and corrected. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS.

  2. How accurate are the geographic locations?

    Navigational accuracy depends on techniques used and are not included in the SEDDATA database. More precise positions of some samples were located on the NGDC website (www.ngdc.noaa.gov); these positions were modified during the inclusion into usSEABED. Locations given at least to tenths of minutes.

  3. How accurate are the heights or depths?

    Depth determination techniques not noted in the database. Locations given to nearest meters.

  4. Where are the gaps in the data? What is missing?

    Data completely included in usSEABED

  5. How consistent are the relationships among the observations, including topology?

    Data fall within normal ranges for analytical results.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: Available from USC
Use_Constraints:
Cite Donn S. Gorsline and the University of Southern California as originators of the data.

  1. Who distributes the data set? (Distributor 1 of 1)

    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213-740-6106 (voice)

  2. What's the catalog number I need to order this data set?

    SEDDATA database

  3. What legal disclaimers am I supposed to read?

    Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of limitations of the data due to possible imprecision due to navigational inaccuracies and limitations of the statistical data.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    None

Who wrote the metadata?

Dates:
Last modified: 2005
Metadata author:
U.S. Geological Survey
c/o Jane A. Reid
Geologist
400 Natural Bridges Drive
Santa Cruz, CA 95060

831-427-4727 (voice)
jareid@usgs.gov

Contact_Instructions: Email preferred
Metadata standard:
CSDGM Version 2 (FGDC-STD-001-1998)

Generated by mp version 2.8.17 on Sat May 20 21:31:39 2006