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Structure contours on top of the Rollins Sandstone Member, southern Piceance Basin

Metadata also available as - [Outline] - [Parseable text] - [DIF]

Frequently-anticipated questions:

What does this data set describe?

Title:
Structure contours on top of the Rollins Sandstone Member, southern Piceance Basin
Abstract:
This is a shapefile of the structure contours on top of the Rollins Sandstone Mbr. in the southern Piceance Basin coal assessment area.
  1. How should this data set be cited?

    U.S. Geological Survey, Central Energy Resources Team, Hettinger, R.D., Roberts, L.N.R, and Gognat, T.A., 2000, Structure contours on top of the Rollins Sandstone Member, southern Piceance Basin: U.S. Geological Survey, Denver, CO USA.

    Online Links:

    Other_Citation_Details:
    in subdir 500k (defines appropriate maximum scale for data use)
    chap. O, Investigations of the distribution and resources of coal in the southern part of the Piceance Basin, Colorado
    This is part of the following larger work.

    Kirschbaum, M.A., Roberts, L.N.R., and Biewick, L.R.H., 2000, Geologic Assessment of Coal in the Colorado Plateau: U.S. Geological Survey Professional Paper 1625-B, U.S. Geological Survey, Denver, CO.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -109.0486
    East_Bounding_Coordinate: -106.9207
    North_Bounding_Coordinate: 39.7141
    South_Bounding_Coordinate: 38.6985

  3. What does it look like?

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

    Beginning_Date: 1996
    Ending_Date: 1998
    Currentness_Reference: Processing Date

  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):

      • Complete Chain (683)

    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 .0001. Longitudes are given to the nearest .0001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

  7. How does the data set describe geographic features?

    ps_strc.dbf
    Shapefile Attribute Table (Source: None)

    Length
    Length of line (Source: Software computed)

    Range of values
    Minimum:0.00006
    Maximum:0.71175

    Depth
    Elevation of top of Rollins Sandstone in feet above mean sea level.

    Range of values
    Minimum:-9999.00
    Maximum:11000.00

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?

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

    U.S. Geological Survey, Central Energy
    c/o Hettinger, R.D.
    PO Box 25046 MS 939 Denver Federal Center
    Denver, CO 80225
    USA

    303.236.7770 (voice)

Why was the data set created?

The Nation's coal resources are being assessed by the USGS. This assessment identifies and characterizes the coal beds and coal zones that will provide the bulk of the nation's coal-derived energy during the next century. This assessment is different from previous large-scale USGS assessments because files and databases are being stored in a digital format and are being analyzed using a Geographic Information System (GIS).

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: 1998 (process 1 of 1)
    Data on the elevation of the top of the Rollins Sandstone Mbr.came from several different sources. A file was generated from the Stratifact database that contained x, y data for location and the elevation of the top of the Rollins Sandstone Mbr. The file was introduced into EarthVision (EV) as a scattered data file.
    Structure contours on top of the Rollins Sandstone from the published map by Johnson (1983) were digitized in EV as a scattered data file. The two files were merged in EV.
    Locations with elevations for the top of the Rollins Sandstone were added to the merged data along the outcrop to add detail that we wouldn't achieve with just drill hole data and the digitized contours. The data were then gridded in EV. The map was plotted in EV with a contour interval of 500 ft. The contour lines were saved in a contour output file. The contour output file was converted to a file in 'arc generate' format using ISMARC and then converted to an ARC/INFO line coverage using an Arc Macro Language program from the Illinois State Geological Survey. The coverage was converted to a shapefile using ArcView.

  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?

    Complete

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

    Line topology 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: Appropriate maximum scale for data use is 500k.

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

    U.S. Geological Survey, Central Energy
    PO Box 25046 MS 939 Denver Federal Center
    Denver, CO 80225
    USA

    303.236.4608 (voice)

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

  3. What legal disclaimers am I supposed to read?

    Any use of trade, product, or company names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. This data is not a legal document and is not intended to be used as such.

  4. How can I download or order the data?

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

    need ARC/INFO 7.0.4 or greater and/or ArcView 2.1 or greater and/or ArcExplorer (which can be downloaded free from <URL:http://www.esri.com>) and/or other software that can read ARC/INFO coverages, ARC/INFO export files, or shapefiles

Who wrote the metadata?

Dates:
Last modified: 03-Feb-1999
Metadata author:
U.S. Geological Survey, Central Energy
PO Box 25046 MS 939 Denver Federal Center
Denver, CO 80225
USA

303.236.4608 (voice)

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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