Sediment sample information from USGS cruise L486NC

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   U.S. Geological Survey, Unpublished material, Sediment sample information from USGS cruise L486NC.

   Online Links:

   • <http://walrus.wr.usgs.gov/infobank/l/L486NC/html/l-4-86-nc.meta.html>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -126.35

   East_Bounding_Coordinate: -123.547

   North_Bounding_Coordinate: 46.407

   South_Bounding_Coordinate: 38.098

3. What does it look like?

   Cruise_L486NC (JPG)

   Screen grab of GIS-produced sample distribution, with bathymetry and land for reference.

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

   Beginning_Date: 23-Aug-1986

   Ending_Date: 03-Sep-1986

   Currentness_Reference: 1999

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):

      • Point (31)

   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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

7. How does the data set describe geographic features?

   Point

   SDTS point (Source: Source data)

   Sample number

   Sample number (Source: US Geological Survey)

   Alpha numeric number based on cruise and core information

   Water depth

   Depth of water at sample site (Source: <http://walrus.wr.usgs.gov/infobank/l/L486NC/html/l-4-86-nc.meta.html>)

   Range of values
   Minimum:	697
   Maximum:	3729
   Units:	Meters
   Resolution:	1.0

   Description

   Written description of core (Source: <http://walrus.wr.usgs.gov/infobank/l/L486NC/html/l-4-86-nc.meta.html>)

   Written description of core, including color

Who produced the data set?

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

2. Who also contributed to the data set?

   The Coastal and Marine Geology team at the USGS for collection and analysis of data. For usSEABED, formatting: K. Halimeda Kilbourne (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

3. To whom should users address questions about the data?
   U.S. Geological Survey
   c/o W. Clinton Steele
   Coastal and Marine Geology
   Menlo Park, CA 94025
   

   1-650-329-5055 (voice)
   

Why was the data set created?

No purpose is given.

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)

   No specific information is available for cores from this cruise.

   Person who carried out this activity:
   

   U.S. Geological Survey
   c/o Michael Torresan
   USGS Coastal and Marine Geology
   Menlo Park, CA 94025
   

   650-329-5493 (voice)
   mtorresan@usgs.gov
   

   Data sources produced in this process:

   • Cruise_L486NC

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?

   Navigation by integrated navigation between GPS and Loran C

3. How accurate are the heights or depths?

   Water depth determination technique probably by 3.5 kHz bathymetric profiler.

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

   No estimate made for original data. For inclusion into usSEABED, all textural data in the dataset were included.

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: Information is available online.

Use_Constraints: Cite the U.S. Geological Survey as the originators of the data.

1. Who distributes the data set? (Distributor 1 of 1)
   U.S. Geological Survey
   Coastal and Marine Geology
   Menlo Park, CA 94025
   

   1-650-329-5055 (voice)
   

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

   Location and descriptive data from cruise L486NC is available through the USGS Coastal and Marine Geology Team Infobank: <http://walrus.wr.usgs.gov/infobank/l/l486nc/html/l-4-86-nc.meta.html>

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?
   • Availability in digital form:

     Data format:	Text in format ASCII Size: 5 KB approximately per sample
     Network links:	Information about cruise at <http://walrus.wr.usgs.gov/infobank/l/l486nc/html/l-4-86-nc.meta.html>

   • Cost to order the data: None

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)