Identification_Information: Citation: Citation_Information: Originator: United States Geological Survey (USGS) Central Region Energy Resources Team Publication_Date: 19990930 Title: harcat.shp (Net coal thickness in the Harmon coal zone, 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 ArcView shapefile is a polygon representation of the net coal thickness in the Harmon 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: -104.0456 East_Bounding_Coordinate: -101.9973 North_Bounding_Coordinate: 47.2832 South_Bounding_Coordinate: 45.9806 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Harmon coal zone Theme_Keyword: Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Theme_Keyword: Coal Theme_Keyword: Coal thickness Theme_Keyword: Net coal isopach map Theme_Keyword: Total net coal thickness Theme_Keyword: USGS National Coal Resource Assessment Place: Place_Keyword_Thesaurus: None Place_Keyword: Harmon coal zone Place_Keyword: Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Place_Keyword: North Dakota 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 Place_Keyword: Williston Basin 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: P.O. 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 through Friday 8:00 AM- 3:00 PM Native_Data_Set_Environment: SunOS, 5.51 sun4d Unix ArcView version 3.0 ARC/INFO 7.1.2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Net coal thickness were checked at random point locations (using stratigraphic database) to determine if coal thicknesses were correct. Logical_Consistency_Report: Polygon feature present Completeness_Report: Net coal thickness is limited to the extent of the Harmon 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: USGS Energy Resources Team Publication_Date: 19980000 Title: National Coal Resource Data System database Geospatial_Data_Presentation_Form: map Other_Citation_Details: U.S. Geological Survey National Center MS 956 Reson, 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: 19750000 Ending_Date: 19980000 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: NCRDS Source_Contribution: This source provided the stratigraphic data needed to calculate net coal thickness at each data point location and generate a net coal thickness isopach map for the Harmon coal zone. Process_Step: Process_Description: Stratigraphic data were compiled in a relational database. These data were correlated and the coal beds in the Harmon coal zone were identified. Stratigraphic data for the coal and rock units in the Harmon coal zone were downloaded from the database and run through a custom "parting/split" program to calculate net coal thickness at each data location. The data were loaded into an EarthVision software program and the net coal thickness was gridded using the isopach grid option, four multiple data point (number of closest control points used for calculating a grid value), and a grid spacing of 300 x 300 meters. An isopach map was generated in EarthVision and was studied in detail. In areas where data were widely spaced and/or isopach lines were not reasonably accurate (based on known geologic factors) control points were added to the data set to better reflect the character of the coal thickness in those areas. Net coal thickness was regridded, new isopach maps constructed with a constant isopach line interval of 2.5 ft, and isopach lines were checked a final time for accuracy. The isopach map was then saved to a file in ASCII format. The ASCII file was modified using a custom program called ismarc. The new file was imported into ARC/INFO and generated as a polygon coverage using an Arc Macro Language (aml). This aml clipped the coverage to the study extent and assigned the net coal 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 2.5 and 5 ft was assigned a net coal thickness attribute of 3.75 ft). A new item was added to the polygon attribute table and populated with text labels corresponding to the coal thickness categories to be used for coal resource tables and graphic display (0-2.5 ft, 2.5-5 ft, 5-10 ft, 10-20 ft, 20-30 ft, and 30-40 ft). The coverage was then dissolved based on the text labels. The final coverage was projected to geographic coordinates 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: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7775 Contact_Electronic_Mail_Address: mellis@usgs.gov Hours_of_Service: Monday through Friday 8:00 AM- 3:00 PM 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: 93 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: harcat.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: 1402.500 Range_Domain_Maximum: 4570968576.000 Attribute: Attribute_Label: Perimeter Attribute_Definition: Perimeter of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 152.703 Range_Domain_Maximum: 1695717.250 Attribute: Attribute_Label: Thickness 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 through Friday 8:00 AM- 3:00 PM Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: 19940608