Metadata: Identification_Information: Citation: Citation_Information: Originator: Fred J. Calef III (compiler) Publication_Date: 19990415 Title: Structure Contours for the Upper Freeport Coal Bed in Maryland, Ohio, Pennsylvania. and West Virginia; c9011ST.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 elevation of the top of the Upper Freeport coal bed, in feet above MSL. It was produced by gridding 100 meter cells from 12,945 point-source data [mainly from the National Coal Resources Data System (NCRDS) of the USGS] and arc files digitized from published structure contour maps using ARC/INFO GRID (Version 7.2.1) software. The grid was subsequently contoured in 200-foot intervals and converted to an ARC/INFO polygon coverage. The elev_st item for each polygon reflects a value halfway between the bounding contour lines. Coverage name: c9011st (011 is the bed code assigned to the Upper Freeport Coal bed). The coverage has been clipped to resource assessment areas that are being used in region 9 (the Appalachian basin) for the Upper Freeport coal bed. Purpose: The purpose of Professional Paper 1625 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 regions. This dataset was used in the National Coal Resource Assessment Program to produce a structure map, which was used to calculate overburden thickness in the evaluation of resources for the Upper Freeport 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: data collection and collation period Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -82.701 East_Bounding_Coordinate: -78.193 North_Bounding_Coordinate: 41.354 South_Bounding_Coordinate: 38.406 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 structure Theme_Keyword: bituminous Theme_Keyword: geologic structure Theme_Keyword: coal elevation 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: ALLEGANY County MD Place_Keyword: GARRETT County MD Place_Keyword: ATHENS County OH Place_Keyword: BELMONT County OH Place_Keyword: CARROLL County OH Place_Keyword: COLUMBIANA County OH Place_Keyword: COSHOCTON County OH Place_Keyword: GALLIA County OH Place_Keyword: GUERNSEY County OH Place_Keyword: HARRISON County OH Place_Keyword: HOCKING County OH Place_Keyword: JACKSON County OH Place_Keyword: JEFFERSON County OH Place_Keyword: LAWRENCE County OH Place_Keyword: MEIGS County OH Place_Keyword: MONROE County OH Place_Keyword: MORGAN County OH Place_Keyword: MUSKINGUM County OH Place_Keyword: NOBLE County OH Place_Keyword: PERRY County OH Place_Keyword: STARK County OH Place_Keyword: TUSCARAWAS County OH Place_Keyword: VINTON County OH Place_Keyword: WASHINGTON County OH Place_Keyword: ALLEGHENY County PA Place_Keyword: ARMSTRONG County PA Place_Keyword: BEAVER County PA Place_Keyword: BUTLER County PA Place_Keyword: CAMBRIA County PA Place_Keyword: CLARION County PA Place_Keyword: CLEARFIELD County PA Place_Keyword: ELK County PA Place_Keyword: FAYETTE County PA Place_Keyword: GREENE County PA Place_Keyword: INDIANA County PA Place_Keyword: JEFFERSON County PA Place_Keyword: SOMERSET County PA Place_Keyword: WASHINGTON County PA Place_Keyword: WESTMORELAND County PA Place_Keyword: BARBOUR County WV Place_Keyword: BROOKE County WV Place_Keyword: GRANT County WV Place_Keyword: HANCOCK County WV Place_Keyword: JACKSON County WV Place_Keyword: MARION County WV Place_Keyword: MARSHALL County WV Place_Keyword: MONONGALIA County WV Place_Keyword: MINERAL County WV Place_Keyword: OHIO County WV Place_Keyword: PRESTON County WV Place_Keyword: RANDOLPH County WV Place_Keyword: TAYLOR County WV Place_Keyword: TUCKER County WV Place_Keyword: TYLER County WV Place_Keyword: UPSHUR County WV Place_Keyword: WETZEL County WV 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: Upper Freeport coal bed horizon Stratum_Keyword: Upper Freeport coal Stratum_Keyword: Upper Freeport Stratum_Keyword: Allegheny Group Stratum_Keyword: Conemaugh Group Access_Constraints: none Use_Constraints: to be used 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) were submitted since the middle 1970's through State cooperative programs. The data for the Upper Freeport 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 (Mitch Blake), 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 original sources of the information in this study. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Deductive_Estimate: The range of elevation values in the well-point source information was -500 to 3940 feet. The range of elevation values in the digitized structure-line source was 100 to 3700 feet. The resultant range of the gridded surface was -526 to 3950 feet; extrapolation was used over the x,y extent. The average absolute Z-error of the grid is unknown. 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 (c9011dp) that contains most publicly available point elevations used to create this map. The Upper Freeport coal was selected by name from the stratigraphic data base stored in StratiFact, a relational data base manager in use by the USGS National Coal Assessment. In some areas with no point data, the Upper Freeport coal bed elevation was extrapolated from structure contour maps of other adjoining coal beds. 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 ARC/INFO. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The raw input data represent values of the elevation above MSL of the top of the Upper Freeport Coal for each borehole or point of measurement. The original measurement errors associated with the topographic surface elevation are unknown; no verification of surface elevations at points of measurement was made with any paper or digital reference. In addition, in Armstrong, Cambria, Clarion, Elk, Indiana, Jefferson, and Westmoreland counties of Pennsylvania, the Lower Freeport and Lower Kittanning coal bed structure information was used to approximate Upper Freeport coal bed structure in areas where Upper Freeport coal bed structure data was absent or insufficient for direct interpretation. Lower Freeport coal structure contours were raised 50 feet in elevation. Lower Kittanning coal structure contours were raised 200 feet in elevation. The vertical accuracy is estimated to be equivalent to 100 feet (half of one contour interval). Lineage: Process_Step: Process_Description: Upper Freeport Coal data from NCRDS was downloaded to StratiFact. Elevation on top of the Upper Freeport was searched from the database and was subsequently exported to ARC/INFO and into a point coverage. Process_Date: 1998 Process_Step: Process_Description: Lower Freeport and Lower Kittanning coal bed structure information was used in Armstrong, Cambria, Clarion, Elk, Indiana, Jefferson, and Westmoreland counties in Pennsylvania and interpreted (elevation increased) to the approximate Upper Freeport coal bed structure. Lower Freeport coal structure contours were raised 50 feet in elevation. Lower Kittanning coal structure contours were raised 200 feet in elevation. Source of Lower Kittanning and Lower Freeport data was the Pennsylvania Bureau of Topographic and Geologic Survey, Mineral Resource Report #92, Part 1, 1987. These data were digitized, edited, and appended from a paper source based on USGS 7.5-minute quad sheets. Process_Date: 1998 Process_Step: Process_Description: Insufficient computer memory necessitated intersecting the digitized lines and points with four overlapping quadrants that covered the extent of the Upper Freeport bed. This created the need to perform the following topogrid step for each of the four areas (labeled se, sw, nw, ne). Process_Date: 1999 Process_Step: Process_Description: Gridding of 12,945 elevations (ARC/INFO 7.2.1 GRID) with a limited number of anomalous data points removed to better reflect local structure. Final grid parameters used: TOPOGRID command utilizing the ANUDEM algorithm (uses a combination of inverse distance weighting, kriging, and spline-method like algorithms), 100 meter cell size, extrapolation over specified x,y extent. Average Z-error is unknown, though expected to be within 100 feet (half contour interval). Both digitized arcs from paper sources and points from the database were input to topogrid command for each quadrant. Process_Date: 1999 Process_Step: Process_Description: The four quadrant grids created with topogrid were mosaiced together. Process_Date: 1999 Process_Step: Process_Description: Mosaiced grid was contoured with a 200-foot interval using LATTICECONTOUR and made into an ARC/INFO line coverage representing Upper Freeport structure contours. Process_Date: 1999 Process_Step: Process_Description: Structure contours were converted into structure polygons using the convert-ism.aml program. This program created polygon labels with a value half way between the contour intervals on either side of the polygon. A decision was made to leave small contour polygons in the resulting file and not to subjectively remove them, even though they may be artificial. Process_Date: 1999 Process_Step: Process_Description: Structure coverage was projected into digital degrees using the PROJECT command into GEOGRAPHIC projection, NAD27 datum, and digital degree units. 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: 6346 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: c9011st.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 structure contour lines. NOTE: values of -9999 are assigned to eroded areas within the coal bed extent. Attribute_Definition_Source: this study Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -500 Range_Domain_Maximum: 3900 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 100 Attribute_Value_Accuracy_Explanation: elevation on top of the Upper Freeport coal bed (in feet) was created by subtraction of depth down drill hole from the surface elevation of the drill hole, gridded, and contoured to nearest 200 feet; accuracy plus or minus one half of one contour interval. NOTE: values of -999 are assigned to eroded or no-coal areas within the coal bed extent. Detailed_Description: Entity_Type: Entity_Type_Label: c9011st.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. NOTE: values of -9999 are assigned to outcrop, which was used as a clipping polygon and are not true elevation values. Attribute_Definition_Source: ARC/INFO Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400 Range_Domain_Maximum: 3800 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 100 Attribute_Value_Accuracy_Explanation: elevation on top of the Upper Freeport coal bed in feet was created by subtraction of depth down the drill hole from the drill hole surface elevation, gridded and contoured to nearest 200 feet; accuracy plus or minus one half of one contour interval. Surface elevations of drill holes were not compared to any paper or digital reference. 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 D, C9011ST.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: 7.2.1 Format_Information_Content: polygons of coal elevation 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: 19990415 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