Metadata: Identification_Information: Citation: Citation_Information: Originator: Susan J. Tewalt Publication_Date: 1997 Title: Structure contours of the Pittsburgh Coal Bed in Pennsylvania, Ohio, West Virginia, and Maryland 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: The Pittsburgh coal bed is composed of regionally persistent divisions- a roof division (coals and shales) and a lower division, referred to as the "main bench". This dataset is a polygon coverage of the elevation of the top of the Pittsburgh Coal bed main bench, in feet above MSL. It was produced by gridding (producing 300 meter cells) 7,101 point-source data mainly from the National Coal Resources Data System (NCRDS) of the USGS, using ISM (Version 7.1) software. The grid was subsequently contoured in 50-ft intervals and imported to ARC/INFO. The elev_st item for each polygon reflects a value halfway between the bounding contour lines. Coverage name: c9024st (024 is the bed code assigned to the Pittsburgh Coal bed). The coverage has been clipped to known resource areas that are being assessed in region 9 (the Appalachian basin) for the Pittsburgh coal bed. Purpose: The purpose of Professional Paper 1625 is to release the interpretation of assessment and modeling data for the top-producing coal beds in the northern and central Appalachian Basin coal regions. This dataset was used in the National Coal Resource Assessment Program to produce a generalized overburden thickness map, which was used in the regional evaluation of resources for the Pittsburgh coal bed in Region 9, the Appalachian basin. The dataset 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: -82.657 East_Bounding_Coordinate: -78.604 North_Bounding_Coordinate: 40.635 South_Bounding_Coordinate: 38.315 Keywords: Theme: Theme_Keyword_Thesaurus: Coal Resource Classification of the U.S. Geological Survey, USGS Circular 891. Theme_Keyword: coal Theme_Keyword: coal resources Theme_Keyword: coal overburden Theme_Keyword: bituminous Theme_Keyword: geologic structure Theme_Keyword: outcrop Theme_Keyword: USGS Theme_Keyword: West Virginia Geological and Economic Survey Theme_Keyword: Ohio Division of Geological Survey Theme_Keyword: Maryland Geological Survey Theme_Keyword: Pennsylvania Bureau of Topographic and Geologic Survey Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: Appalachians Place_Keyword: CLAY County WV Place_Keyword: RITCHIE County WV Place_Keyword: MUSKINGUM County OH Place_Keyword: MONROE County OH Place_Keyword: WETZEL County WV Place_Keyword: TYLER County WV Place_Keyword: MARION County WV Place_Keyword: MONONGALIA County WV Place_Keyword: GREENE County PA Place_Keyword: BROOKE County WV Place_Keyword: TAYLOR County WV Place_Keyword: KANAWHA County WV Place_Keyword: LINCOLN County WV Place_Keyword: WAYNE County WV Place_Keyword: TUCKER County WV Place_Keyword: GRANT County WV Place_Keyword: MINERAL County WV Place_Keyword: GARRETT County MD Place_Keyword: SOMERSET County PA Place_Keyword: CAMBRIA County PA Place_Keyword: PRESTON County WV Place_Keyword: FAYETTE County PA Place_Keyword: BARBOUR County WV Place_Keyword: UPSHUR County WV Place_Keyword: BRAXTON County WV Place_Keyword: CABELL County WV Place_Keyword: LAWRENCE County OH Place_Keyword: GALLIA County OH Place_Keyword: MASON County WV Place_Keyword: PUTNAM County WV Place_Keyword: JACKSON County WV Place_Keyword: MEIGS County OH Place_Keyword: ROANE County WV Place_Keyword: WIRT County WV Place_Keyword: CALHOUN County WV Place_Keyword: ATHENS County OH Place_Keyword: WASHINGTON County OH Place_Keyword: WOOD County WV Place_Keyword: PLEASANTS County WV Place_Keyword: GILMER County WV Place_Keyword: DODDRIDGE County WV Place_Keyword: MORGAN County OH Place_Keyword: HARRISON County WV Place_Keyword: NOBLE County OH Place_Keyword: GUERNSEY County OH Place_Keyword: BELMONT County OH Place_Keyword: OHIO County WV Place_Keyword: HARRISON County OH Place_Keyword: CARROLL County OH Place_Keyword: JEFFERSON County OH Place_Keyword: MARSHALL County WV Place_Keyword: BEAVER County PA Place_Keyword: ALLEGHENY County PA Place_Keyword: ARMSTRONG County PA Place_Keyword: INDIANA County PA Place_Keyword: WESTMORELAND County PA Place_Keyword: ALLEGANY County MD Place_Keyword: LEWIS County WV Place_Keyword: HANCOCK County WV Place_Keyword: WASHINGTON County PA 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: Pittsburgh coal bed horizon Stratum_Keyword: Pittsburgh coal Stratum_Keyword: Upper Pennsylvanian Stratum_Keyword: Monongahela Group Stratum_Keyword: Conemaugh Group Access_Constraints: none Use_Constraints: use for regional analysis only Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt 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: 703-648-6437 Data_Set_Credit: The stratigraphic data stored in the National Coal Resources Data System (NCRDS) was submitted since the middle 1970's through State cooperative programs. The data for the Pittsburgh 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 (Nick Fedorko), the Pennsylvania Bureau of Topographic and Geologic Survey (James R. Shaulis and Viktoras W. Skema), the Ohio Division of Geological Survey (Richard W. Carlton) and the Maryland Geological Survey (Dave Brezinski). [WVGES, PAGS, OHGS, and MDGS, respectively.] It is recommended that new data be obtained from the State geological surveys that are the sources of he information used in this study. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Deductive_Estimate: The range of elevation values in the point-source information was 13 to 2620 feet. The resultant range of the gridded surface was 13 to 2620 feet; extrapolation was used over the x,y extent plus 5%. The average absolute Z-error of the grid was 1.6 feet, which is 0.04 percent of the range. Surface elevations of boreholes or measurements (from which the elevation of the Pittsburgh main bench was in part determined) were not verified with any paper or digital reference. 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. There is a point coverage available (c9024dp) that contains most point elevations used to create this map. The main bench of the Pittsburgh coal was selected by name from the stratigraphic database stored in StratiFact, a relational database manager in use by the USGS National Coal Assessment. The original data submitted to NCRDS may not have had the Pittsburgh main bench identified (stratigraphically below the Pittsburgh roof coals), a task conducted in StratiFact by examination of cross sections of drill holes. A coverage of structure contours over the entire Pittsburgh horizon areal extent, sc024bsn, is also available. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: A wide variety of data sources were used as input to this data set. The worst horizontal error is expected to be approximately 1/4 mile. Original data were stored in NCRDS in latitude/longitude coordinates with a possible precision of decimal seconds. Some loss of precision was made upon conversion to StratiFact. Location coordinates were converted to Albers Equal Area projection (.01 meter precision) prior to gridding in ISM. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The raw input data represent calculations: subtraction of the depth to the Pittsburgh Coal main bench from the surface (topographic) elevation of each borehole or point of measurement. The original measurement errors associated with the depth and surface elevation are unknown. Surface elevations for the drillholes in the database were not compared to any paper or digital reference. In addition, for some point locations only the elevation on the bottom of the Pittsburgh main bench (not the top of the main bench) was available and was therefore used. The thickness of the Pittsburgh is less than the possible vertical accuracy of approximately 50 feet. Lineage: Process_Step: Process_Description: Pittsburgh Coal data from NCRDS printed and verified against original data sources. Process_Date: 1995 Process_Step: Process_Description: Corrections made to West Virginia and Maryland data in StratiFact. Corrections made to Pennsylvania data in NCRDS (Ingres database). Pennsylvania data downloaded to StratiFact. StratiFact data base obtained for Ohio from OHGS. Process_Date: 1995-1996 Process_Step: Process_Description: Editing of individual data bases in StratiFact to eliminate data coding differences between states. Process_Date: 1996-1997 Process_Step: Process_Description: Obtained approximately 1000 elevations on the BOTTOM of the Pittsburgh coal bed from 11 WVGES Open-File maps of Wetzel County, WV (See open- file map for citations). Obtained approximately 650 elevations on the BOTTOM of the Pittsburgh coal bed from PAGS Westmoreland, Fayette, and Washington county reports. 85 elevations on the BOTTOM of the Pittsburgh coal bed from MDGS unpublished map. Added data to separate StratiFact data bases. Process_Date: 1997 Process_Step: Process_Description: Gridded 7,101 elevations (using ISM7.1), prompting further refinement of data values in StratiFact data bases. Final grid parameters used: normal minimum tension surface algorithm, 300 meter cell size, extrapolation over specified x,y extent plus 5%. Average Z-error was 1.6 feet. Grid was contoured with 50-foot interval and made into an ASCII output file. Decision was made to leave small contour polygons in the resulting file and not to subjectively remove them, even though they may be gridding artifacts. Process_Date: 1997 Process_Step: Process_Description: Import contours to ARC/INFO for the entire basin, using conversion ARC/INFO AML provided by Illinois State Geological Survey. Rectangular area used as clip cover during import. Process_Date: 1997 Process_Step: Process_Description: Checked attributes of cover. Deleted 3 small polygons not having polygon labels. Process_Date: 1997 Process_Step: Process_Description: Clipped contours to the known resource areas (ARC/INFO coverage c9024ro) defined in USGS Open-File Report 96-280. Process_Date: 1997 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: 4776 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 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: c9024st.pat Entity_Type_Definition: polygon attribute table for coverage Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: elev_st Attribute_Definition: average elevation value of bounding contour lines Values of -999 assigned to internal no-coal areas and are not true elevations. Attribute_Definition_Source: this study Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 25 Range_Domain_Maximum: 2625 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 50 Attribute_Value_Accuracy_Explanation: elevation on top of the Pittsburgh coal bed main bench (exclusive of roof coals) in feet was created by subtraction of depth down drill hole from surface elvation, gridded, and contoured to nearest 50 feet; accuracy plus or minus one contour interval. Detailed_Description: Entity_Type: Entity_Type_Label: c9024st.aat Entity_Type_Definition: arc attribute table for coverage Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: elev_st Attribute_Definition: elevation value of contour lines. Values of 0 represent arcs from the clipping polygon (outcrop) and are not true elevations. Attribute_Definition_Source: this study Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 50 Range_Domain_Maximum: 2600 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 50 Attribute_Value_Accuracy_Explanation: elevation on top of the Pittsburgh coal bed main bench (exclusive of roof coals) in feet was created by subtraction of depth down drill hole from surface elevation, gridded and contoured to nearest 50 feet; accuracy plus or minus one contour interval. Values of 0 are assigned to the outcrop arcs, which were used as a clipping polygon and are not elevation values. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt 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: 703-648-6437 Resource_Description: USGS Professional Paper 1625-C: Chapter C, c9024st.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 these data have 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: 7.1.1 Format_Information_Content: polygonal elevation 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: 19980505 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt 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: 703-648-6437 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998