A preliminary investigation of the structure of southern Yucca Flat, Massachusetts Mountain, and CP basin, Nevada Test Site, Nevada, based on geophysical modeling

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?
• 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?

Title:

A preliminary investigation of the structure of southern Yucca Flat, Massachusetts Mountain, and CP basin, Nevada Test Site, Nevada, based on geophysical modeling

Abstract:

Gravity data for the northern CP Basin and Massachusettes Mountain areas, Nevada Test Site, Nevada

1. How should this data set be cited?

   Phelps, G., Justet, L., Moring, B., and Roberts, C., 2005, A preliminary investigation of the structure of southern Yucca Flat, Massachusetts Mountain, and CP basin, Nevada Test Site, Nevada, based on geophysical modeling: U.S. Geological Survey Open-File Report 2005-1367

   Online Links:

   • http://pubs.usgs.gov/of/2005/1367/

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -116.050516

   East_Bounding_Coordinate: -115.967899

   North_Bounding_Coordinate: 36.933502

   South_Bounding_Coordinate: 36.850160

3. What does it look like?

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

   Calendar_Date: 2005

   Currentness_Reference: ground condition

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

   Geospatial_Data_Presentation_Form: vector digital data

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 (146)
      • Point (4)

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 11

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.999600

      Longitude_of_Central_Meridian: -117.000000

      Latitude_of_Projection_Origin: 0.000000

      False_Easting: 500000.000000

      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000005
      Ordinates (y-coordinates) are specified to the nearest 0.000005
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
      

7. How does the data set describe geographic features?

   gravity.asc

   x y z ascii file

   X

   longitude coordinate

   Y

   latitude coordinate

   Coordinates defining the features.

   mGal

   isostatic residual gravity value, in mGal

   Entity_and_Attribute_Overview:

   Z-values are the value of the isostatic residual gravity anomaly at the given location

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

2. Who also contributed to the data set?

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

   Geoffrey A. Phelps
   U.S.G.S.
   geologist
   345 Middlefield Road MS 989
   Menlo Park, CA 94025
   USA
   

Gravity survey was conducted to fill in gaps in spatial coverage of existing gravity data in the area.

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   (process 1 of 1)

   See accompanying report for description of data processing

1. How well have the observations been checked?

   values are reported to the nearest 0.05 mGal

2. How accurate are the geographic locations?

   GPS accuracy should be within 1m horizontal accuracy

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 observations, including topology?

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

Access_Constraints: none

Use_Constraints: none

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

   U.S. Geological Survey
   

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

   Downloadable Data

3. What legal disclaimers am I supposed to read?

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	ASCII Size: 0.043

   • Cost to order the data: $0

Dates:

Last modified: 19-Aug-2005

Metadata author:

Geoffrey A. Phelps
U.S. Geological Survey
Menlo Park, CA 94025

650-329-4922 (voice)

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

• <http://www.esri.com/metadata/esriprof80.html>