Identification_Information: Citation: Citation_Information: Originator: Geoffrey Phelps Publication_Date: 20020930 Title: Gravity inversion model of Frenchman Flat basin, Nevada Test Site, Nevada Geospatial_Data_Presentation_Form: raster digital data in ASCII XYZ format Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 02-363 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Description: Abstract: This dataset is distributed as an XYZ ASCII format data file generated from the 2002 gravity inversion model of the bedrock beneath Frenchman Flat basin. Data forms a rectangular grid of data values IN the defined projection. The data values are the depth below the land surface,in meters, of the modeled location of the Pre-Tertiary basement surface. The report which accompanies the data explains the modeling process and results. Purpose: These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display a geophysical model of the elevation of the basin beneath Frenchman Flat, Nevada Test Site, Nevada. Supplemental_Information: Information for USGS Western Earth Surface Processes Team related activities are online at Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -116.08897159 East_Bounding_Coordinate: -115.81127475 North_Bounding_Coordinate: 36.93573514 South_Bounding_Coordinate: 36.71733292 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: gravity Theme_Keyword: inversion Theme_Keyword: basement Theme_Keyword: basin model Theme_Keyword: sensitivity analysis Place: Place_Keyword_Thesaurus: None Place_Keyword: Nevada Test Site Place_Keyword: NTS Place_Keyword: Nye County Place_Keyword: Frenchman Flat Place_Keyword: Frenchman Playa Place_Keyword: Nevada Place_Keyword: NV Place_Keyword: USA Access_Constraints: none Use_Constraints: Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Geoffrey Phelps Contact_Organization: U.S. Geological Survey (USGS) Western Earth Surface Processes Team (WESP) Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Road, MS 989 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650-329-4922 Contact_Facsimile_Telephone: 650-329-5133 Contact_Electronic_Mail_Address: gphelps@usgs.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 1; ESRI ArcCatalog 8.1.1.649 Cross_Reference: Citation_Information: Originator: Geoffrey Phelps Publication_Date: 2002 Title: Gravity inversion model of Frenchman Flat basin, Nevada Test Site, Nevada Geospatial_Data_Presentation_Form: raster digital data Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Not determined. Logical_Consistency_Report: Values wihtin the raster dataset are valid depth values. Values represent the center of cells 500 meters by 500 meters. From the original rectangular raster dataset, only values with valid depths are present in the ASCII data file (all null values have been omitted). Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Not determined. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Not determinied Lineage: Process_Step: Process_Description: The depth to the Pre-Tertiary basement was determined by conducting a gravity inversion modeling process described in the U.S. Geological Survey Open-File report 02-363. The gridded data are converted to an XYZ ASCII format file (northing, easting, depth below surface in meters). Process_Date: 20020930 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 49 Column_Count: 49 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -117.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 500.000000 Ordinate_Resolution: 500.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: XYZ ASCII file of modeled depth to Pre-Tertiary basement formatted as single lines of text of northing,easting,depth (in meters below ground surface) e.g.: 596611.73883294,4087950.2778684,0 597111.73883294,4087950.2778684,0 597611.73883294,4087950.2778684,0 595111.73883294,4087450.2778684,711.5488 595611.73883294,4087450.2778684,639.9702 596111.73883294,4087450.2778684,236.1196 596611.73883294,4087450.2778684,0 597111.73883294,4087450.2778684,0 597611.73883294,4087450.2778684,6.930904 Entity_and_Attribute_Detail_Citation: this report Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: United States Geological Survey (USGS) Information Services Contact_Address: Address_Type: mailing and physical address Address: Box 25286 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (888)ASK-USGS Resource_Description: All files for this report can be accessed via the World Wide Web at: http://geopubs.wr.usgs.gov/open-file/of02-363 or through File Transfer Protocol (FTP) at ftp://geopubs.wr.usgs.gov/pub/open-file/of02-363/ Distribution_Liability: Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII Format_Specification: XYZ ASCII format Format_Version_Date: 20020930 Format_Information_Content: x-coordinate, y-coordinate, depth in meters below ground surface File_Decompression_Technique: none Transfer_Size: 67Kb Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://geopubs.wr.usgs.gov/open-file/of02-363 Ordering_Instructions: download data and report from Fees: None Metadata_Reference_Information: Metadata_Date: 20020905 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS) Western Earth Surface Processes Team (WESP) Contact_Person: Geoffrey Phelps Contact_Position: geologist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 989, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025 Contact_Voice_Telephone: 650-329-4922 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile