ATMX_TOCPOLY.SHP - 1995 National Assessment of Oil and Gas Resources of the United States: Total Organic Carbon Content

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

Frequently-anticipated questions:

What does this data set describe?

Title:
ATMX_TOCPOLY.SHP - 1995 National Assessment of Oil and Gas Resources of the United States: Total Organic Carbon Content
Abstract:
This GIS overlay is a component of the U.S Geological Survey, Woods Hole Science Center's, Gulf of Mexico GIS database. The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.
  1. How should this data set be cited?

    U.S. Geological Survey, 2005, ATMX_TOCPOLY.SHP - 1995 National Assessment of Oil and Gas Resources of the United States: Total Organic Carbon Content: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Twichell, D.C., Cross, V.A., Paskevich, V.F., Hutchinson, D.R., Winters, W.J., and Hart, P.E., 2005, GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -97.317879
    East_Bounding_Coordinate: -65.712280
    North_Bounding_Coordinate: 44.718563
    South_Bounding_Coordinate: 23.811539

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1071/data/assessments/atmx_tocpoly/atms_tocpoly.gif> (GIF)
    Image showing the extent and coverage of the data layer.

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

    Calendar_Date: 1996
    Currentness_Reference: publication date

  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):

      • G-polygon (13)

    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 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    atmx_tocpoly
    Shapefile Attribute Table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    AREA

    Range of values
    Minimum:0.025
    Maximum:54.026

    PERIMETER

    Range of values
    Minimum:0.618
    Maximum:62.824

    GT__5_TOC

    Areas where toc >0.5% identified by "yes" and areas where toc <0.5% are blank.

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?

    Please credit Timothy S. Collett, USGS, as the originator of the dataset from which this GIS data layer is derived.

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

    Dave Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This GIS data layer is a polygon that shows areas where the total organic carbon content of sediment exceeds 0.5% within the U.S. Exclusive Economic Zone of the Gulf of Mexico and Atlantic Ocean regions. The original total organic carbon contours (in percent) were compiled by Collett (1995) as part of the assessment of gas hydrate resources for the 1995 National assessment of United States oil and gas resources. This shapefile was created by VeeAnn Cross. The tabular data used to generate this shapefile were copied from Charpentier et al (1996).

How was the data set created?

  1. From what previous works were the data drawn?

    DDS-36 (source 1 of 1)
    Charpentier, Ronald R., Klett, T. R., Obuch, R. C., and Brewton, J. D., 1996, Tabular data, text, and graphical images in support of the 1995 National assessment of United States oil and gas resources: Digital Data Series 36, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    Polygon of organic carbon content exceeding 0.5% - This CD-ROM contains files in support of the 1995 USGS National assessment of United States oil and gas resources (DDS-30), which was published separately and summarizes the results of a 3-year study of the oil and gas resources of the onshore and state waters of the United States. The study describes about 560 oil and gas plays in the United States; confirmed and hypothetical, conventional and unconventional. A parallel study of the Federal offshore is being conducted by the U.S. Minerals Management Service. This CD-ROM contains files in multiple formats, so that almost any computer user can import them into word processors and spreadsheets. The tabular data include some tables not released in DDS-30. No proprietary data are released on this CD-ROM, but some tables of summary statistics from the proprietary files are provided. The complete text of DDS-30 is also available, as well as many figures. Also included are some of the programs used in the assessment, in source code and with supporting documentation. A companion CD-ROM (DDS-35) includes the map data and the same text data, but none of the tabular data or assessment programs.

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

    Date: 01-May-2003 (process 1 of 5)
    The original file, atmx_toc.lin, was copied from DDS 36 where it had been stored in the Arc ungenerate format.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o VeeAnn Atnipp Cross
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time
    Data sources used in this process:
    • atmx_toc.lin

    (process 2 of 5)
    This file was read into ArcView 3.2 using an avenue script called loalin.ave which converted the ungenerate format to a shapefile. The file was made into a polyline shapefile, and the projection was kept as the original Albers Equal Area.

    (process 3 of 5)
    ArcToolbox was used to define the projection of the shapefile as Albers Equal Area, NAD83. The projection information used was listed by ESRI as: USA_Contiguous_Albers_Equal_Area_Conic_USGS.

    (process 4 of 5)
    The shapefile was then reprojected to Geographic, NAD83 using ArcToolbox, v. 8.2.

    (process 5 of 5)
    The shapefiles atms_toc.shp and atmx_eez.shp were merged together to provide an outer boundary for the toc polygon using the geoprocessing wizard in ArcView 3.2. The merged shapefile was converted to a coverage using the shapearc command in ArcInfo (version 8.2). This coverage needed some cleaning up, which was done in ArcEdit. Within ArcEdit the build command was run which generated a polygon coverage. The resulting polygon coverage was added to ArcView 3.2 and saved as a shapefile.

    Data sources produced in this process:

    • atmx_tocpoly.shp

  3. What similar or related data should the user be aware of?

    Collett, T.S., 1996, Gas hydrate resources of the United States: Digital Data Series 30, U.S. Geological Survey, Reston, VA.

    Online Links:

    This is part of the following larger work.

    Gautier, Donald L. (editor), Dolton, Gordon L (editor), Takahashi, Kenneth I. (editor), and Varnes, Katharine L. (editor), 1996, 1995 National Assessment of United States Oil and Gas Resources - Results, Methodology, and Supporting Data: Digital Data Series 30, U.S. Geological Survey, Reston, VA.

    Online Links:

    Charpentier, R.R., Klett, T.R., Obuch, R.C., and Brewton, J.D., 1996, Tabular data, text, and graphical images in support of the 1995 National assessment of United States oil and gas resources: Digital Data Series 36, U.S. Geological Survey, Reston, VA.

    Online Links:

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?

    None.

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

    These data are believed to be logically consistent.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

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

    Deborah Hutchinson
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2263 (voice)
    (508) 457-2310 (FAX)
    dhutchinson@usgs.gov

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although this derived data set and their lineage datasets have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

  4. How can I download or order the data?

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

    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS® or ArcView® 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 26-Oct-2005
Last Reviewed: 06-Feb-2004
Metadata author:
U.S. Geological Survey
c/o David Twichell
Oceanographer
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x 2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.6 on Mon Dec 12 11:19:29 2005