Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey, Central Energy Resources Team Originator: Brownfield, M.E. Originator: Roberts, L.N.R. Originator: Johnson, E.A. Originator: Mercier, T.J. Publication_Date: 2000 Title: dan*_thk (Isopachs of total net coal in beds >1.2' thick, A - G coal zones, Danforth Hills coal field) Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Denver, CO USA Publisher: U.S. Geological Survey Other_Citation_Details: in subdir 62k (defines appropriate maximum scale for data use) chap. M, Assessment of the distribution and resources of coal in the Fairfield Coal Group of the Williams Fork Formation, Danforth Hills coal field, northwest Colorado Larger_Work_Citation: Citation_Information: Originator: Kirschbaum, M.A. Originator: Roberts, L.N.R. Originator: Biewick, L.R.H. Publication_Date: 2000 Title: Geologic Assessment of Coal in the Colorado Plateau Series_Information: Series_Name: U.S. Geological Survey Professional Paper Issue_Identification: 1625-B Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Description: Abstract: These are shapefiles and ARC/INFO polygon coverages showing the isopachs of total net coal in beds greater than or equal to 1.2' thick for the A through G coal zones, Danforth Hills coal field. The coverage dana_thk is the isopach coverage for the A coal zone; danb_thk is for the B coal zone, and so on. Purpose: The Nation's coal resources are being assessed by the USGS. This assessment identifies and characterizes the coal beds and coal zones that will provide the bulk of the nation's coal-derived energy during the next century. This assessment is different from previous large-scale USGS assessments because files and databases are being stored in a digital format and are being analyzed using a Geographic Information System (GIS). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19980000 Currentness_Reference: Processing Date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -108.0731 East_Bounding_Coordinate: -107.6914 North_Bounding_Coordinate: 40.3360 South_Bounding_Coordinate: 40.0832 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Colorado Plateau Theme_Keyword: Colorado Plateau coal assessment study area Theme_Keyword: National Coal Resource Assessment Theme_Keyword: NCRA Theme_Keyword: coal-bearing formations Theme_Keyword: coal thickness Place: Place_Keyword_Thesaurus: None Place_Keyword: Colorado Plateau Place_Keyword: Colorado Place_Keyword: Piceance Basin Place_Keyword: Danforth Hills Stratum: Stratum_Keyword_Thesaurus: Geologic Names Unit Lexicon (GNULEX) Stratum_Keyword: Mesaverde Group Stratum_Keyword: Williams Fork Formation Stratum_Keyword: Trout Creek Sandstone Mbr. Access_Constraints: None Use_Constraints: appropriate maximum scale for data use is 62k Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4608 Native_Data_Set_Environment: SunOS, 5.5.1, sun4d UNIX, ARC/INFO version 7.0.4 and ArcView 3.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Logical_Consistency_Report: Polygon topology present. Completeness_Report: complete Lineage: Process_Step: Process_Description: Stratigraphic data from the Stratifact relational database were dumped into a temporary file that is input for a parting/split program. This program, written at the USGS, determines whether a rock unit between two coal units is a parting in a coal bed or if the rock unit splits two separate coal beds as defined in (Wood and others, 1983, p. 36). Coal units are combined to form a single bed if the thickness of rock between them is thinner than the coal on either side. If the rock is thinner it is considered to be a parting and if it is thicker it is considered to be a split. After the program calculates the thickness of coal in each coal bed it determines if the coal beds are greater than the minimum thickness requirement as a resource. For coals of bituminous rank, this minimum thickness is 1.2 ft. (Wood and others, 1983, p.34). The program goes through another process where it sums coal bed thickness of only the coal beds that are greater than or equal to the minimum thickness (1.2'). The program outputs a single line of data for each location with net coal thickness and x, y location parameters. The data output from this program also contains a column designating the number of coal beds that were added to arrive at the net coal thickness. This file is introduced into EarthVision (EV) as a scattered data file and projected into Lambert Conformal Conic projection. Locations with a net coal thickness value of zero were appended to the scattered data file to control extrapolation during gridding. This scattered data file was then gridded in EV using the 'minimum tension grid' option. The map was plotted in EV with a contour interval appropriate for the range of thickness for each coal zone. The contour lines were saved in a contour output file. The contour output file was converted to a file in 'arc generate' format using ISMARC and then converted to an ARC/INFO polygon coverage using an Arc Macro Language program from the Illinois State Geological Survey. The coverage was converted to a shapefile using ArcView. Process_Date: 19980000 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: 36 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: .0001 Longitude_Resolution: .0001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum 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: dan*_thk.dbf Entity_Type_Definition: Shapefile Attribute Table Entity_Type_Definition_Source: None Attribute: Attribute_Label: Area Attribute_Definition: Area of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000000 Range_Domain_Maximum: 0.023717 Attribute: Attribute_Label: Perimeter Attribute_Definition: Perimeter of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000561 Range_Domain_Maximum: 2.103282 Attribute: Attribute_Label: Depth2 Attribute_Definition: Net coal thickness in feet. Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4608 Resource_Description: shapefile and ARC/INFO coverage Distribution_Liability: Any use of trade, product, or company names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARC/INFO coverage, export file, shapefile Format_Version_Number: ARC/INFO 7.0.4, ArcView 2.1 Digital_Transfer_Option: Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Fees: none Technical_Prerequisites: need ARC/INFO 7.0.4 or greater and/or ArcView 2.1 or greater and/or ArcExplorer (which can be downloaded free from ) and/or other software that can read ARC/INFO coverages, ARC/INFO export files and/or shapefiles Metadata_Reference_Information: Metadata_Date: 19990203 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4608 Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: FGDC-STD-001-1998 ------------------------------------------------------------------------ Generated by mp version 2.4.8 on Wed Sep 29 13:34:36 1999