Identification_Information:
  Citation:
    Citation_Information:
      Title: Gravity map and data of the eastern half of the Big Bear Lake 
             100,000 scale quadrangle, California and analysis of the depths of 
             several basins.
      Originator: Roberts, C.W.
      Originator: Jachens, R.C.
      Originator: Katzenstein, A.
      Originator: Smith, G.A
      Originator: Johnson, R. 
    Edition: version 1.0
      Geospatial_Data_Presentation_Form: web site
      Series_Information:
        Series_Name: Open File Report
        Issue_Identification: OFR 2002-XXXX
      Publication_Information:
        Publication_Place: Menlo Park, California
        Publisher: U.S. Geological Survey
      Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of02-XXXX
  Description:
    Abstract: An isostatic residual gravity map of the Big Bear Lake 100,000 
              scale quadrangle, California was prepared and then this data set 
              used with other information to compute the configuration of 
              several ground water basins. Basin thickness maps were then 
              prepared.
    Purpose:  This gravity dataset was collected in order to have adequate 
              gravity information over the basins and adjacent basement rocks 
              that the gravity data could be inverted to separate the basin 
              component and then the thickness of the basins could be computed.

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2002
    Currentness_Reference: publication date
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: none planned
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -116.500
      East_Bounding_Coordinate: -116.000
      North_Bounding_Coordinate: 34.500
      South_Bounding_Coordinate: 34.000
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: basement rock
      Theme_Keyword: depth to basement
      Theme_Keyword: gravity survey
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Joshua Tree
      Place_Keyword: Twentynine Palms
	Place Keyword: Yucca Valley
	Place Keyword: Marine Corps Air Ground Combat Center Twentynine Palms
      Place_Keyword: California
  Access_Constraints: none
  Use_Constraints: none
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Carter Roberts
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: Mailing Address
        Address: 345 Middlefield Rd, MS 989
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025
        Country: U.S.A.
      Contact_Voice_Telephone: 650-329-5319
      Contact_Electronic_Mail_Address: croberts@usgs.gov
  Browse_Graphic:
    Browse_Graphic_File_Name: 
  Browse_Graphic_File_Description: graphical representation of map
    Browse_Graphic_File_Type: PDF
  Native_Data_Set_Environment: SUN Ultra4000, UNIX platform
  Cross_Reference:
    Citation_Information:
      Originator: 
      Originator: 
      Publication_Date: 2002
  Title: Gravity map and data of the eastern half of the Big Bear Lake 100,000 
         scale quadrangle, California and analysis of the depths of several 
         basins.
Edition: version 1.0
      Geospatial_Data_Presentation_Form: web site
      Series_Information:
        Series_Name: Open-File Report
        Issue_Identification: OFR 02-XXXX
      Publication_Information:
        Publication_Place: Menlo Park, California
        Publisher: U.S. Geological Survey
      Online_Linkage: http://geopubs.wr.usgs.gov/
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Observed gravity data are accurate to about 
       0.05 milligals.
  Logical_Consistency_Report: Gravity anomalies were visually checked and 
       reviewed at a scale of 1:100,000.
  Completeness_Report: This map was produced to be used at a map scale of 
       1:100,000.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Accuracy of the data is about 18 m.
  Lineage:
    Source_Information:
      Source_Citation:
 		Citation_Information:
      	Originator: Roberts, C.W.
      	Originator: Jachens, R.C.
      	Originator: Katzenstein, A.
      	Originator: Smith, G.A
      	Originator: Johnson, R.
          Publication_Date: 2002
          Title: : Gravity map and data of the eastern half of the Big Bear 
              Lake 100,000 scale quadrangle, California and analysis of the
              depths of several basins.
          Edition: first edition
          Series_Information:
            Series_Name: Open-File Report
            Issue_Identification: OFR 02-XXXX
          Publication_Information:
            Publication_Place: Menlo Park, California
            Publisher: U.S. Geological Survey
      Type_of_Source_Media: web site
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2002
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Roberts and others 2002
      Source_Contribution: reference
    Process_Step:
      Process_Description: data collected
      Process_Date: 1986 to 2001
    Process_Step:
      Process_Description: data reviewed
      Process_Date: 2000 to 2001
    Process_Step:
      Process_Description: data published
      Process_Date: 2002
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: point
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.01 minute
      Longitude_Resolution: 0.01 minute
      Geographic_Coordinate_Units: Degrees and decimal minutes
    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
  Vertical_Coordinate_Ststem_Definition:
      Vertical_Datum_Name: National Geodetic Vertical Datum 1929 (NGVD29)
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: 345 Middlefield Rd, MS-989
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025
      Contact_Voice_Telephone: 650-329-5319
  Distribution_Liability: Although this digital spatial data has been subjected 
        to rigorous review and is substantially complete, it is released on the 
        condition that neither the USGS nor the United States Government may be 
        held liable for any damage resulting from its authorized or unauthorized 
        use.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ASCII
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://geopubs.wr.usgs.gov/
    Fees: none
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U. S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: USGS Information Services
        Address: Box 25046
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 1-888-ASK-USGS
  Resource_Description:
  Distribution_Liability: None
  Standard_Order_Process:
    Non-digital_Form: 
Metadata_Reference_Information:
  Metadata_Date: 20020617
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Carter Roberts
      Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: 345 Middlefield Rd., MS 989
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025
        Country: USA
      Contact_Voice_Telephone: (650) 329-5319
      Contact_Electronic_Mail_Address: croberts@usgs.gov
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Access_Constraints: none
  Metadata_Use_Constraints: none