Identification_Information:
  Citation:
    Citation_Information:
      Originator: Debra M. Hurwitz
      Originator: James W. Head
      Publication_Date: 20120824
      Title: Geologic Map of the Snegurochka Planitia Quadrangle (V-1), Venus
      Geospatial_Data_Presentation_Form: vector digital data
      Publication_Information:
        Publication_Place: Reston, VA
        Publisher: U. S. Geological Survey
      Online_Linkage: http://pubs.usgs.gov/sim/3178/
      Series_Information:
        Series_Name: U.S. Geological Survey Scientific Investigations Map
        Issue_Identification: SIM 3178
  Description:
    Abstract: The Snegurochka Planitia region (V-1) is a predominantly low-lying terrain that covers the north polar region of Venus, extending from 75 degrees N. to 90 degrees N. and from 0 degrees E. to 360 degrees E. The plains associated with Snegurochka Planitia abut the highlands of Metis Regio to the south from approximately 240 degrees E. to 300 degrees E. (V-6) and the highlands of Ishtar Terra to the south from approximately 300 degrees E. to 60 degrees E. (Lakshmi Planum, V-7; Fortuna Tessera, V-2). The plains of Louhi Planitia also lie within the V-1 region and form the northern border with the highlands of Tethus Regio from approximately 60 degrees E. to 120 degrees E. (V-3) and with the lowlands of both Atalanta Planitia (V-4) and the nearby deformed region containing a series of ridged belts (V-5) from approximately 120 degrees E. to 240 degrees E. The plains generally lie between +500 m and -500 m of the mean planetary radius (MPR) of 6051.8 km, with the highest terrain in the region, the northernmost extent of Ishtar Terra (Itzpapalotl Tessera, 75 degrees N., ~315 degrees E.), rising more than 6.4 km above MPR.
    Purpose: To develop a geologic map for the V-1 Venus quad
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: None planned
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: 360
      East_Bounding_Coordinate: 0
      North_Bounding_Coordinate: 90
      South_Bounding_Coordinate: 75
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: NASA
      Theme_Keyword: Geology
      Theme_Keyword: Structure
      Theme_Keyword: Volcanic
      Theme_Keyword: synthetic aperture radar (SAR)
      Theme_Keyword: Magellan SAR
      Theme_Keyword: Topography
    Place:
      Place_Keyword_Thesaurus: Gazetteer of Planetary Nomenclature
      Place_Keyword: Venus, Snegurochka Planitia
  Access_Constraints: None
  Use_Constraints: None
  Data_Set_Credit: Hurwitz, D.M., and Head, J.W., 2012, Geologic map of the Snegurochka Planitia quadrangle (V-1), Venus: U.S. Geological Survey Scientific Investigations Map 3178, pamphlet 28 p., 1 sheet, scale 1:5,000,000. (Available at http://pubs.usgs.gov/sim/3178/ )
  Security_Information:
    Security_Classification: Unclassified
  Native_Data_Set_Environment: ESRI ArcMap 9.3
Data_Quality_Information:
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Publication_Date: 19890701
          Title: Spaceborne radar observations - A guide for Magellan radar-image analysis
      Type_of_Source_Media: satellite
      Source_Citation_Abbreviation: Spaceborne radar observations - A guide for Magellan radar-image analysis
      Source_Contribution: Mapping was completed using data collected by the synthetic aperture radar (SAR) aboard the Magellan spacecraft. The Magellan SAR instrument operated at a wavelength of 12.6 cm (S-band) with horizontal and parallel transmit/receive polarization that allowed for cloud penetration and for discrimination of wavelength-scale surface roughness.
    Process_Step:
      Process_Description: Geologic units and boundary relations are mapped using mosaics of full-resolution Magellan synthetic aperture radar (SAR) F-MIDR, F-Map, and C1-MIDR data loaded into ArcGIS mapping software at a scale of 1:5 million. Digital versions of Magellan altimetry data are also used to analyze the geology within Snegurochka Planitia (V-1).
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: 2197
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 3
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 15806
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Entity point
      Point_and_Vector_Object_Count: 3291
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 12
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 18288
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GeoUnits
      Entity_Type_Definition: Geologic Units
      Entity_Type_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: DataGaps
      Entity_Type_Definition: Area of no image coverage
      Entity_Type_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GeoContacts
      Entity_Type_Definition: Contacts as defined as certain, approximate or gradational
      Entity_Type_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: LocationFeatures
      Entity_Type_Definition: features representing shields, steep-sided dome, or crater central peaks
      Entity_Type_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Channels
      Entity_Type_Definition: feature mapped as a channel
      Entity_Type_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: LinearFeatures
      Entity_Type_Definition: linear features representing wrinkle ridges, simple ridges, lineament, or crater rims
      Entity_Type_Definition_Source: USGS
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: USGS Publications
        Contact_Person: Astrogeology Science Center
  Resource_Description:
  Distribution_Liability: See access and use constraints information.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: File Geodatabase Feature Dataset
        Format_Version_Number: 9.3
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/sim/3178/
    Fees: None
  Available_Time_Period:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 20120827
Metadata_Reference_Information:
  Metadata_Date: 20120827
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: USGS
        Contact_Person: Trent Hare
      Contact_Position: GIS Manager
      Contact_Address:
        Address_Type: physical
        Address: 2255 North Gemini Drive
        City: Flagstaff
        State_or_Province: AZ
        Postal_Code: 86001
        Country: US
      Contact_Electronic_Mail_Address: thare@usgs.gov
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Use_Constraints: None