LI 426, A Summary of Sediment Size, Composition, X-Radiography, Structure and Engineering Properties of 7 cores and 20 grabs from the east Pacific Nov-Dec 1971 (USNS DeSteiguer)

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Frequently-anticipated questions:

What does this data set describe?

Title:
LI 426, A Summary of Sediment Size, Composition, X-Radiography, Structure and Engineering Properties of 7 cores and 20 grabs from the east Pacific Nov-Dec 1971 (USNS DeSteiguer)
Abstract: No abstracted information given in report
  1. How should this data set be cited?

    U.S. Naval Oceanographic Office (NavOceanO), Kravitz, J.H., Ross, C.M., and Loomis, P.B., 1972, LI 426, A Summary of Sediment Size, Composition, X-Radiography, Structure and Engineering Properties of 7 cores and 20 grabs from the east Pacific Nov-Dec 1971 (USNS DeSteiguer): Laboratory Item 426, U.S. Naval Oceanographic Office, Washington D.C. 20373.

    Online Links:

    Other_Citation_Details:
    Geological Laboratory, Nearshore Surveys Division, Oceanographic Surveys Department;

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -123.784
    East_Bounding_Coordinate: -123.423
    North_Bounding_Coordinate: 38.204
    South_Bounding_Coordinate: 37.803

  3. What does it look like?

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

    Beginning_Date: 23-Nov-1971
    Ending_Date: 09-Dec-1971
    Currentness_Reference: Publication date

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

    Geospatial_Data_Presentation_Form: Digital and paper

  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):

      • Point (27)

    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 report)

    Sample number
    Sample number (Source: Source report)

    Alpha numeric number based on project number and core information

    Water depth
    Water depth at sample site (Source: Source report)

    Range of values
    Minimum:212
    Maximum:3274
    Units:Meters
    Resolution:1.0

    Color
    Wet sediment color determined in the lab (Source: Geological Society of America)

    Color and Munsell color code

    Sediment type
    Sample sediment (Source: Source report)

    Written description of sediment texture

    Remarks
    Remarks (Source: Source report)

    Additional comments about sample

    Grainsize percents
    Percent of sample in defined phi-size bins (Source: Source report)

    Range of values
    Minimum:< -4
    Maximum:> 10
    Units:Phi
    Resolution:1.0

    Gravel
    Amount of gravel in sample (Source: Source report)

    Range of values
    Minimum:0
    Maximum:22.441
    Units:Percent
    Resolution:0.001

    Sand
    Amount of sand in sample (Source: Source report)

    Range of values
    Minimum:0.301
    Maximum:98.376
    Units:Percent
    Resolution:0.001

    Silt
    Amount of silt in sample (Source: Source report)

    Range of values
    Minimum:0.597
    Maximum:55.353
    Units:Percent
    Resolution:0.001

    Clay
    Amount of clay in sample (Source: Source report)

    Range of values
    Minimum:0.828
    Maximum:79.986
    Units:Percent
    Resolution:0.001

    Mean
    First moment measure of grainsize) (Source: Source report)

    Range of values
    Minimum:1.655
    Maximum:9.416
    Units:Phi
    Resolution:0.001

    Standard deviation
    Second moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:0.984
    Maximum:2.949
    Units:Phi
    Resolution:0.001

    Skewness
    Third moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:-0.762
    Maximum:2.236
    Units:Phi
    Resolution:0.001

    Kurtosis
    Fourth moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:-1.629
    Maximum:31.826
    Units:Phi
    Resolution:0.001

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?

    United States Naval Oceanographic Office for the collection, analysis and archival of data; NGDC for archiving the report.. For inclusion into usSEABED: digitization and formatting April Villagomez (USGS); Corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

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

    National Geophysical Data Center (NGDC)
    c/o Robin R. Warnken
    E/GC3 325 Broadway
    Boulder, CO 80305-3328

    303-497-6338 (voice)
    Robin.R.Warnken@noaa.gov

Why was the data set created?

No specific purpose noted in report

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: 1973 (process 1 of 1)
    No process information given in report.

    Data sources produced in this process:

    • NavOceanO LI 426

  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?

    Statistical data was digitized by hand (typed in) at NGDC. For usSEABED, digital data and the scanned reported were downloaded via the web, visually compared to source and corrected. Additional data may have been included from the scanned report, also available online. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS.

  2. How accurate are the geographic locations?

    Navigational techniques not recorded in report; latitudes and longitudes given in degrees, minutes, hundredths.

  3. How accurate are the heights or depths?

    Water depth determination technique not noted in report. Water depths were given, subsample depths in centimeters from top of core.

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

    Textural and grainsize data available are included. Additional data available from scanned report.

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

    Data fall within normal ranges for the given parameters.

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:
Cite U.S. Naval Oceanographic Office and NGDC as originators of the data

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

    National Geophysical Data Center (NGDC)
    c/o Robin R. Warnken
    E/GC3 325 Broadway
    Boulder, CO 80305-3328

    303-497-6338 (voice)
    Robin.R.Warnken@noaa.gov

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

    MGGID 09635002

  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, limitations of the statistical data, and digitizing errors.

  4. How can I download or order the data?

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

    web browser and internet access preferred

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 Wed May 17 12:21:42 2006