Identification_Information: Citation: Citation_Information: Originator: USGS Central Region Energy Resources Team Publication_Date: 19990930 Title: hanovb.shp (Overburden above the Hansen coal zone in the Bowman-Dickinson coalfield). Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U. S. Geological Survey Professional Paper Issue_Identification: 1625-A Publication_Information: Publication_Place: Denver, CO Publisher: USGS Central Region Energy Resources Team Description: Abstract: This shapefile contains a representation of the overburden thickness above the Hansen coal zone in the Bowman-Dickinson coalfield, Williston Basin, North Dakota. This theme was created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region. 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 few decades. This assessment is different from previous USGS assessments because digital files and databases are being collected and stored in standardized formats,and being analyzed using a Geographic Information System (GIS). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19980000 Currentness_Reference: Publication Date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -104.0439 East_Bounding_Coordinate: -102.1198 North_Bounding_Coordinate: 47.1404 South_Bounding_Coordinate: 45.9445 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Overburden Theme_Keyword: Coal Theme_Keyword: Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Theme_Keyword: Minimum overburden Theme_Keyword: Overburden isopach map Theme_Keyword: Overburden thickness Theme_Keyword: USGS National Coal Resource Assessment Theme_Keyword: Hansen coal zone Place: Place_Keyword_Thesaurus: None Place_Keyword: North Dakota Place_Keyword: Williston Basin Place_Keyword: Northern Rocky Mountain and Great Plains Region Place_Keyword: Bowman-Dickinson coalfield Place_Keyword: Golden Valley County Place_Keyword: Billings County Place_Keyword: Stark County Place_Keyword: Slope County Place_Keyword: Hettinger County Place_Keyword: Bowman County Place_Keyword: Adams County Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Energy Resources Team Contact_Person: Margaret Ellis Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7775 Contact_Electronic_Mail_Address: mellis@usgs.gov Hours_of_Service: Monday-Friday 8:00-3:00 P.M. Native_Data_Set_Environment: Sun0S.5.51 sun4d Unix ArcView version 3.0 ARC/INFO version 7.1.2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No test for accuracy. Logical_Consistency_Report: Polygon features present Completeness_Report: The overburden (rock above the coal zone) is limited to the extent of the Hansen coal zone in the Bowman-Dickinson coalfield. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Limited to software coordinate precision for geographic coordinates Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Energy Resources Team Publication_Date: 19980000 Title: USGS National Coal Resource Data System database Geospatial_Data_Presentation_Form: map Other_Citation_Details: US Geological Survey National Center MS 956 Reston, VA 20192 (attn. M.D. Carter) Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19740000 Ending_Date: 19980000 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: NCRDS Source_Contribution: This source provided the stratigraphic data need to generate an EarthVision grid that represents the elevation at the top of the uppermost coal in the Hansen coal zone. Source_Information: Source_Scale_Denominator: 250,000 Type_of_Source_Media: online Source_Citation_Abbreviation: DEM Source_Contribution: This source provided a grid that represents the elevation of the topography (surface elevation) in the Hansen coal zone study area. Process_Step: Process_Description: Stratigraphic data were compiled in a relational database. These data were correlated and the coal and rock above, within, and below the Hansen coal zone were labelled. Stratigraphic data for the coal and rock units within the Hansen coal zone were downloaded from the database. These data were loaded into a EarthVision (EV) software program.. The elevation at the top of the coal zone was then gridded in EV using the normal minimum tension grid option, four multiple data points (number of closest control points used for calculating a grid value), and a 500 x 500-meter grid spacing. The ARC/INFO DEM coverage (with 500 x 500-meter data spacing) was imported into EV, defined as a grid file, and clipped to the same lateral extent as the EV grid of the top of the coal zone. Using the EV formula processor, the top of the coal zone grid was subtracted from the surface elevation (DEM) grid to create a (minimum) overburden grid. An isopach map was then generated from this grid, with a constant contour interval of 100 ft, and saved to a file in ASCII format. The ASCII file was modified using a custom program called ismarc. The modified file was imported into ARC/INFO and generated as a polygon coverage using an Arc Macro Language (aml). The aml clipped the coverage to the study extent and assigned the overburden thickness polygons with values that are the average of the values of the bounding isopach lines (for example, a polygon defined by isopach lines of 100 and 200 ft was assigned an overburden thickness attribute of 150 ft). A new item was then added to the polygon attribute table and populated with text labels corresponding more closely to overburden categories that we were to use for coal resource tables and graphic display (0-100 ft, 100-200 ft, 200-300 ft, 300-400 ft, 400-500 ft, 500-1,000 ft, and 1,000-2,000 ft). The polygon coverage was then dissolved based on the text labels. The final coverage was projected to geographic and made into a shapefile in ArcView. Process_Date: 19980000 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Energy Resources Team Contact_Person: Margaret Ellis Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7775 Contact_Electronic_Mail_Address: mellis@usgs.gov Hours_of_Service: Monday-Friday 8:00-3:00 P.M. 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: 403 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: hanovb.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: 40.500 Range_Domain_Maximum: 1694815104.000 Attribute: Attribute_Label: Perimeter Attribute_Definition: Perimeter of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 26.144 Range_Domain_Maximum: 1078870.250 Attribute: Attribute_Label: Overburden Attribute_Definition: Thickness Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Energy Resources Team Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.1647 Hours_of_Service: Monday through Friday, 8:00 AM- 3:00 PM Distribution_Liability: The US Geological Survey provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in this geographic data. The USGS further makes no warranties, 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 USGS computers, no warranty, expressed or implied, is made by the 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 use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by the USGS. Metadata_Reference_Information: Metadata_Date: 19980000 Metadata_Review_Date: 19990000 Metadata_Future_Review_Date: 19990000 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Energy Resources Team Contact_Person: Margaret Ellis Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7775 Contact_Electronic_Mail_Address: mellis@usgs.gov Hours_of_Service: Monday-Friday 8:00-5:00 P.M. Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: 19940608