Metadata: Identification_Information: Citation: Citation_Information: Originator: Philip Freeman Publication_Date: 2000 Title: Overburden thickness categories of Pocahontas No. 3 coal bed: c9104ob.e00 Larger_Work_Citation: Citation_Information: Originator: Northern and Central Appalachian Basin Coal Regions Assessment Team Publication_Date: 2000 Title: 2000 Resource Assessment of Selected Coal Beds and Zones in the Northern and Central Appalachian Basin Coal Regions Series_Information: Series_Name: U.S. Geological Survey Professional Paper Issue_Identification: PP1625-C Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://greenwood.cr.usgs.gov/pub/ppapers/p1625c/ Description: Abstract: This dataset is a polygon coverage of the thickness of the overburden of the Pocahontas No. 3 coal bed, in feet. It was produced by importing 1:100,000 (30-minute) and 1:24,000 scale (7.5-minute) digital elevation models (DEM) into ARC, and merging the lattices into one. The structure elevation grid for the Pocahontas No. 3 coal bed was subtracted from the surface elevation grid, creating overburden thickness. This grid was contoured within the known extent of the Pocahontas No. 3 coal bed into 200, 500, 1000, 2000, and 3000 foot lines. This vector file was imported to ARC. Polygon attributes include a code for the USGS overburden category (Coal Resource Classification of the U.S. Geological Survey, USGS, circular 891). Coverage name is c9104ob. Purpose: The purpose of PP 1625-C is to release the interpretation of assessment and modeling data for the the top-producing coal beds in the northern and central Appalachian Basin coal region. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Currentness_Reference: data collection and collation period Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -82.565 East_Bounding_Coordinate: -80.738 North_Bounding_Coordinate: 37.964 South_Bounding_Coordinate: 36.842 Keywords: Theme: Theme_Keyword_Thesaurus: Coal Resource Classification of the U.S. Geological Survey, USGS circular 891. Theme_Keyword: Eastern Energy Team Theme_Keyword: energy Theme_Keyword: power Theme_Keyword: resources Theme_Keyword: coal Theme_Keyword: coal resources Theme_Keyword: coal extent Theme_Keyword: bituminous Theme_Keyword: overburden Theme_Keyword: USGS Theme_Keyword: West Virginia Geologic and Economic Survey Theme_Keyword: Virginia Division of Mineral Resources Theme_Keyword: Virginia Department of Mines, Minerals and Energy Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: United States Place_Keyword: West Virginia Place_Keyword: Virginia Place_Keyword: Appalachians Place_Keyword: GREENBRIER County Place_Keyword: FAYETTE County Place_Keyword: RALEIGH County Place_Keyword: MERCER County Place_Keyword: SUMMERS County Place_Keyword: WYOMING County Place_Keyword: MCDOWELL County Place_Keyword: LOGAN County Place_Keyword: MINGO County Place_Keyword: TAZEWELL County Place_Keyword: BUCHANAN County Place_Keyword: RUSSELL County Place_Keyword: DICKENSON County Place_Keyword: WISE County Place_Keyword: SCOTT County Stratum: Stratum_Keyword_Thesaurus: Geologic Names Unit Lexicon (GNULEX), 1996; Stratigraphic Nomenclature Databases for the United States, It's Possessions, and Territories, U.S. Geological Survey Digital Data Series DDS-6, release 3. Stratum_Keyword: Pennsylvanian Stratum_Keyword: Lower Pennsylvanian Stratum_Keyword: Pocahontas Formation Stratum_Keyword: Pocahontas No. 3 coal bed Access_Constraints: None Use_Constraints: To be used for regional analysis only. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Philip Freeman (compiler) Contact_Organization: U.S. Geological Survey, Eastern Energy Resources Team 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: 703-648-6447 Data_Set_Credit: The stratigraphic data stored in the National Coal Resources Data System (NCRDS) was submitted from the middle 1970's through State cooperative programs. Additional data was provided by the West Virginia Geologic and Economic Survey and the Virginia Division of Mineral Resources. The data for the Pocahontas No. 3 coal bed was used with the permission and through the cooperation of coal geologists (primary contacts listed) at the West Virginia Geological and Economic Survey (B. M. Blake, Jr.) and the Virginia Division of Mineral Resources (J. Nolde). It is recommended that additional data be obtained from the State geological surveys that were the original sources of this information. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Deductive Estimate: Because of limitations of the digital elevation model and the generalized nature of the structure model, many small-scale features may not be represented and local accuracy is estimated to be poor. Logical_Consistency_Report: Topology for this data set was built using the CLEAN command within ARC/INFO, version 7.2.1. This command eliminates dangling nodes, calculates intersections of arcs, eliminates redundant arcs, and creates a polygon attribute table. This data set does not contain dangles or redundant arcs. Completeness_Report: This data set is a representation of overburden thickness categories of Pocahontas No. 3 coal within coal assessment areas as prescribed by USGS Circular 891. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The structure grid cell sizes used to create this file were 135 meter square. The contouring routine may go to either side of a cell; therefore, horizontal accuracy is estimated minimally to be 67.5 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The polygonal data values represent the subtraction of the top of the Pocahontas No. 3 from a DEM lattice. The original measurement errors associated with the DEM vary with scale; errors associated with the structure contour map are likely to be on the order of 50 feet. These errors may be cumulative. The grid which produced the contours for this coverage's polygons had a maximum value for overburden thickness under 4000 feet within the resource areas shown on this coverage. Lineage: Process_Step: Process_Description: Gridding of Pocahontas No. 3 coal bed coal elevations to create structure on the top of the coal, using EarthVision v. 4. Grid parameters used: normal minimum tension surface algorithm, 135 meter grid size, extrapolation over specified x,y extent. Creation of contours with 100-foot interval. Process_Date: 1999 Process_Step: Process_Description: Imported 36 1:100,000 scale (30-minute) DEM's into ARC lattices for central Appalachians (no coverage of Pikeville, Ky and Beckley, WV 100K quadrangles). Process_Date: 1998 Process_Step: Process_Description: 36 lattices merged. Process_Date: 1998 Process_Step: Process_Description: Imported 32 1:24,000 scale (7.5-minute) DEM's into ARC lattices for both Pikeville, Ky and Beckley, WV 100K quadrangles. Process_Date: 1998 Process_Step: Process_Description: Lattices of Pikeville, Ky and Beckley, WV 100K quadrangle DEMs were merged, reprojected to geographic, decimal seconds and resampled the cell size to 2 arc-seconds. Process_Date: 1998 Process_Step: Process_Description: Merged three lattices (30-minute and two 7.5-minute). Process_Date: 1998 Process_Step Process_Description: Manually edited DEM lattice where there was 'no data' Process_Date: 1998 Process_Step: Process_Description: Converted Z-units of topographic surface lattice from meters into feet. Process_Date: 1999 Process_Step: Process_Description: DEM data imported to Earthvision, version 4.0 and reprojected to Albers Equal Area projection. Process_Date: 1999 Process_Step: Process_Description: Resampled topography grid to same cell size (135 m) as structure. Calculated overburden by subtraction of structure from topography. Contoured overburden grid into line file (limited to within the extent of the Pocahontas No. 3 coal bed and horizon) using specific thickness values: 200, 500, 1000, 2000 and 3000 feet. Process_Date: 1999 Process_Step: Process_Description: Imported overburden contour lines to ARC (over coal bed horizon extent.) Process_Date: 1999 Process_Step: Process_Description: Built polygon topology using clean command with dangle and fuzzy set to 1. Polygons were clipped to resource area coverage and polygons were attributed using code described in this document. Process_Date: 1999 Process_Step: Process_Description: Projected cover to geographic from albers. 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: GT-polygon composed of chains Point_and_Vector_Object_Count: 1514 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0001 Longitude_Resolution: 0.0001 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: c9104ob.pat Entity_Type_Definition: polygon attribute table for c9120.ob coverage Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: OB_CAT Attribute_Definition: Numeric code assigned to categories defined in USGS Circular 891. Attribute_Definition_Source: this study Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 103 Enumerated_Domain_Value_Definition: 0 - 200 feet of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 105 Enumerated_Domain_Value_Definition: 200 - 500 ft of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 106 Enumerated_Domain_Value_Definition: 500 - 1000 ft of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 107 Enumerated_Domain_Value_Definition: 1000 - 2000 ft of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 108 Enumerated_Domain_Value_Definition: 2000 - 3000 ft of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 109 Enumerated_Domain_Value_Definition: 3000 - 6000 ft of overburden thickness Enumerated_Domain: Enumerated_Domain_Value: 999 Enumerated_Domain_Value_Definition: "no coal" area and no overburden Enumerated_Domain_Value_Definition_Source: Philip Freeman (compiler) Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Philip Freeman Contact_Organization: U.S. Geological Survey, Eastern Energy Resources Team 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: 703-648-6447 Resource_Description: USGS Professional Paper 1625-C: Chapter G; c9104ob.e00 Distribution_Liability: Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this data has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and 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, software, or related materials. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 7.2.1 Format_Information_Content: Polygonal overburden coverage Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://greenwood.cr.usgs.gov/pub/ppapers/p1625c/ Fees: none Metadata_Reference_Information: Metadata_Date: 20000823 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Philip Freeman (compiler) Contact_Organization: U.S.Geological Survey, Eastern Energy Resources Team 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: 703-648-6447 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998