Total thickness contours of the Zone 6 coal bed (in USGS thickness intervals) in Central Texas

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2011

Title:

Total thickness contours of the Zone 6 coal bed (in USGS thickness intervals) in Central Texas

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: AAPG Discovery Series/AAPG Studies in Geology

Issue_Identification: No.14/No. 62

Publication_Information:

Publication_Place: Tulsa, OK

Publisher: American Association of Petroleum Geologists

Online_Linkage:

\\IGSAAAHMWSG223\D$\Data_New\GIS\AAPG\Chapter_20_GIS\Northeast Texas Study Area\data\z6iso\z6iso.shp

Larger_Work_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2011

Title:

Geologic Assessment of Coal in the Gulf of Mexico Coastal Plain, U.S.A.

Description:

Abstract:

This data set is a polygon coverage of the cumulative thickness of Zone 6, in feet, over extent of the Zone 6 coal and its horizon (stratigraphic equivalent) in Central Texas only. The coverage was produced by gridding more than 350 public and confidential point- source data from the National Coal Resources Data System (NCRDS) of the USGS, using EarthVision (Version 4.0.2) software, subsequently contoured into 6-inch intervals, and imported to ARC/INFO. The 'thickness' item for each polygon reflects a value in feet halfway between the bounding contour lines. This value represents results of gridding which averages point values within cells, therefore, public point data may not always match values represented in the isopach data layer.

Purpose:

This data set was used in the National Coal Resource Assessment Program in the regional evaluation of resources for the coal Zone 6 in the Gulf Coast region. The data set is useful for regional studies- not applicable to local scales.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1970's

Ending_Date: 1997

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -96.58

East_Bounding_Coordinate: -95.88

North_Bounding_Coordinate: 31.81

South_Bounding_Coordinate: 31.09

Keywords:

Theme:

Theme_Keyword_Thesaurus: Theme_Keyword_Thesaurus

Theme_Keyword: coal

Theme_Keyword: coal resources

Theme_Keyword: coal thickness

Theme_Keyword: lignite

Theme_Keyword: isopach

Theme_Keyword: outcrop

Theme_Keyword: USGS

Place:

Place_Keyword_Thesaurus: Geographic Names Information System

Place_Keyword: Gulf Coast Region

Place_Keyword: Freestone County, TX

Place_Keyword: Limestone County, TX

Place_Keyword: Robertson County, TX

Place_Keyword: Leon County, TX

Stratum:

Stratum_Keyword_Thesaurus: Stratum_Keyword_Thesaurus

Stratum_Keyword: Wilcox Group

Stratum_Keyword: Paleocene-Eocene

Access_Constraints: none

Use_Constraints: none

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter D. Warwick

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing address

Address: MS 956 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 703-648-6469

Contact_Electronic_Mail_Address: pwarwick@usgs.gov

Data_Set_Credit:

The stratigraphic data stored in the NCRDS has been submitted by State Geological Surveys and USGS scientists since its inception in the middle 1970's through state cooperative programs. The data for the Zone 6 coal bed was used with the permission and through the cooperation of coal geologists (primary contacts listed) at the State of Texas Bureau of Economic Geology and the State of Texas Railroad Commission

Native_Data_Set_Environment:

Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.3000

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The range of thickness values in the point-source information was 0 to 22.00 feet. The resultant range of the gridded surface was 0-20 feet; extrapolation was used over the x,y extent. The average absolute Z-error of the grid was 1.20 percent of the range.

Logical_Consistency_Report: Topologically clean

Completeness_Report:

Input points were irregularly distributed over the spatial extent of the study, therefore areas of sparse data will not reflect ground truth. Zone 6 cumulative coal thicknesses were selected by name from the stratigraphic data base stored in StratiFact, a relational data base manager in use by the USGS National Coal Assessment. The original data submitted to NCRDS may not have had the Zone identified, a task performed within StratiFact by examining data in cross sections. Data used were selected by geologist from the database.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: NCRDS, USGS

Publication_Date: 1995

Title: NCRDS Digital Data Set

Type_of_Source_Media: on-line data base

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1995

Ending_Date: 2000

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation:

NCRDS- National Coal Resources Data System;BEG-Bureau of Economic Geology; RRC-Railroad Commission

Source_Contribution: NCRDS- point-source data

Process_Step:

Process_Description:

Zone 6 data from NCRDS printed and verified against original data sources where possible. New data collected from the BEG and the RRC, and entered into NCRDS.

Process_Date: 1995-1998

Process_Step:

Process_Description:

Corrections made to NCRDS (including the new BEG and RRC data) in StratiFact.

Process_Date: 1996-1998

Process_Step:

Process_Description:

Editing and correlation of individual data bases in StratiFact to eliminate data coding differences between data sets.

Process_Date: 1998

Process_Step:

Process_Description:

Editing of thicknesses and further addition and refinement of data values to place in StratiFact data bases. The data were filtered in StratiFact and filtered in EarthVision (v.4.0.2) in geographic coordinates. The data are gridded and grid parameters used were a default 182 x 218 grid, X range -96.90438 to -95.69272, Y range 30.62942 to 32.30208, extrapolation of values over specified x,y extent plus 5%. Contour intervals at irregular intervals at 0-1.5 ft,1.5-2.5 ft, 2.5-5 ft, 5-10 ft, 10-20 ft, 20-30 ft. to follow USGS Circular 891

Process_Date: 1999

Process_Step:

Process_Description:

Grid was contoured in EarthVision into 0.5-foot intervals, using 0 to 30 feet as limits. Contour file was graphically edited in EarthVision to fit the geology of the area.

Process_Date: 1999

Process_Step:

Process_Description:

Grid was projected into Albers and regridded using the original graphically edited grid to decrease the cell size so that the small polygons in the limiting unioned coverage used for volume calculations will have a grid value to use for each small 402.10 x 404.97.

Process_Date: 1999

Process_Step:

Process_Description:

Import of contours to ARC/INFO for the entire area, using conversion ARC/INFO AML provided by Illinois State Geological Survey, and rectangular area ARC coverage (box) to enclose polygons. Polygons graphically labeled in ARC/EDIT using midpoint value for upper and lower bounding contours. The 0, 0.75, 2, 3.75, 7.5, 15, 25 (ft).

Process_Date: 1999

Process_Step:

Process_Description:

New attribute item "thickness" added and calculated from the polygon value. Added item for thickness category and populated it by graphically selecting desired polygons by thickness and calculating the category value.

Process_Date: 1999

Process_Step:

Process_Description:

Arc/Info coverages were projected to geographic coordinates, converted to shape Arc/View shape files and imported into Arc/View.

Process_Date: 1999

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 59

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: z6iso.dbf

Entity_Type_Definition: polygon attribute table for coverage

Entity_Type_Definition_Source: ARC/INFO

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute:

Attribute_Label: PERIMETER

Attribute:

Attribute_Label: thickness

Attribute_Definition: average thickness value of bounding contour lines

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 15

Attribute_Units_of_Measure: feet

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: 0.5 - 5

Attribute_Value_Accuracy_Explanation:

plus or minus one contour interval, in feet

Attribute:

Attribute_Label: thick_is_c

Attribute_Definition: category label for coal bed thickness

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 0,99,100,101,102,103,104

Enumerated_Domain_Value_Definition:

'0' is no coal,'99' is 0 - 1.5 feet and not used in resource calculations,'100' is 1.5 - 2.5 feet,'101' is 2.5 - 5.0 feet,'102' is 5.0 - 10 feet,'103' is 10 - 20 feet Enumerated_Domain_Value_Definition_Source: NCRDS point-source data

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: American Association of Petroleum Geologists

Contact_Address:

Address_Type: mailing address

Address: P. O. Box 979

City: Tulsa

State_or_Province: OK

Postal_Code: 74101-0979

Country: USA

Contact_Voice_Telephone: 1 800 364 2274

Contact_Facsimile_Telephone: 1 918 560 2665

Resource_Description: Northeast Texas Zone 6 coal data set

Distribution_Liability:

The US Geological Survey provides these geographic data "as is". USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. USGS further makes no warrantees, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of the USGS, no warranty, expressed or implied, is made by USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the delivery, installation, operation, or support by USGS.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE

Transfer_Size: 0.123

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <URL:<http://www.energy.er.usgs.gov>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 2011

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter D. Warwick

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing address

Address: MS 956 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 703-648-6469

Contact_Electronic_Mail_Address: pwarwick@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

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

Profile_Name: ESRI Metadata Profile