# Volcanic basement topography (contours)

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# Metadata:

- Identification_Information
- Metadata_Reference_Information
- Data_Quality_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Lineage

Identification_Information:
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization:
          Water & Environmental Research Institute (WERI), University of Guam
      Contact_Position: Staff Hydrologist
      Contact_Voice_Telephone: +1-671-735-2693
  Citation:
    Citation_Information:
      Originator:
        Vann, D.T., V.M. Bendixson, D.F. Roff, N.C. Habana, C.A. Simard, R.M. Schumann, and J.W. Jenson
      Publication_Date: 2013
      Title: Volcanic basement topography (contours)
      Online_Linkage: <http://www.weriguam.org/reports/list.html>
      Other_Citation_Details:
        Dataset is either part of or derived from the basement volcanic map titled "Topography of the Basement Rock beneath the Northern Guam Lens Aquifer and its Implications for Groundwater Explorartion and Development"
  Keywords:
    Theme:
      Theme_Keyword: topography
      Theme_Keyword: volcanic basement
      Theme_Keyword: Northern Guam Lens Aquifer
      Theme_Keyword: NGLA
      Theme_Keyword: groundwater
      Theme_Keyword: hydrogeology
      Theme_Keyword: contours
    Place:
      Place_Keyword: Guam
      Place_Keyword: U.S. Territory
      Place_Keyword: Mariana Islands
      Place_Keyword: Micronesia
      Place_Keyword: Northwest Pacific
      Place_Keyword: Western Pacific
      Place_Keyword: Pacific Islands
  Description:
    Abstract:
      This dataset is part of the 2013 volcanic basement map, an update of the original 1982 map produced by the Northern Guam Lens Study (CDM, 1982). The work on updating the map utilized geophysical and drilling data to correct and refine our understanding of basement topography and improve the map; see WERI Technical Report #141 (Bendixson, 2013). Details on the methodology used, content, and applications of the map can be found in WERI Technical Report #142 (Vann et al., 2013).
    Purpose:
      This dataset shows the elevation contours of the contact surface between the basement volcanic units and the overlying limestone units of the northern Guam plateau. The basement topography is highly significant because it guides the movement of groundwater and separates the NGLA into subsurface drainage basins.
    Supplemental_Information:
      Because permeability of the underlying volcanic basement rock is orders magnitude lower than that of the limestone bedrock aquifer that overlies it, the uneven topography of the basement partitions northern Guam’s aquifer into six semi-contiguous basins, each containing three groundwater zones. In the basal zone, the freshwater lens flows seaward, floating on saltwater that permeates the aquifer beneath it. Para-basal water overlies the basement rock below sea level in a zone extending from the basement sea-level contour down to the saltwater toe, past which it enters the basal zone. Patches of supra-basal water overlie parts of the flank of basement rock above sea level, where vadose water flowing downslope toward the para-basal zone may be concentrated or impounded behind topographic irregularities.
  Status:
    Progress: In work
    Maintenance_and_Update_Frequency: As needed
  Use_Constraints:
    This dataset is for general information and educational purposes only and not for use in litigation. It contains no authoritative positional or other data. The Water & Environmental Research Institute (WERI) cannot assume liability for any damages or misrepresentations caused by any inaccuracies in the data or as a result of the data to be in a particular system.
  Data_Set_Credit: Vann et al. (2013)
  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2013
    Currentness_Reference: publication date

Metadata_Reference_Information:
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Maria Kottermair
        Contact_Organization: Water & Environmental Research Institute, University of Guam
      Contact_Position: Research Assistant III
      Contact_Electronic_Mail_Address: mariakottermair@uguamlive.uog.edu
      Contact_Voice_Telephone: (671) 735-2751
  Metadata_Date: 20131015
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Data_Quality_Information:
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: WERI
          Title: 121812A_contours
          Geospatial_Data_Presentation_Form: shapefile
    Source_Information:
      Source_Citation:
        Citation_Information:
          Title: head_nopump
          Originator: USGS
          Geospatial_Data_Presentation_Form: TIN
          Other_Citation_Details: Draft results from model by Steven Gingerich (USGS)
  Logical_Consistency_Report:
    see WERI Technical Reports #141 by Bendixson (2013) and #142 by Vann et al. (2013) for detailed information.

Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: basement_topography_contours
    Attribute:
      Attribute_Label: OBJECTID
      Attribute_Definition: Internal feature number.
      Attribute_Definition_Source: Esri
      Attribute_Domain_Values:
        Unrepresentable_Domain:
          Sequential unique whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: Shape
      Attribute_Definition: Feature geometry.
      Attribute_Definition_Source: Esri
      Attribute_Domain_Values:
        Unrepresentable_Domain: Coordinates defining the features.
    Attribute:
      Attribute_Label: ID
    Attribute:
      Attribute_Label: Contour_m
    Attribute:
      Attribute_Label: Shape_Length
      Attribute_Definition: Length of feature in internal units.
      Attribute_Definition_Source: Esri
      Attribute_Domain_Values:
        Unrepresentable_Domain: Positive real numbers that are automatically generated.

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Water & Environmental Research Institute, University of Guam

Spatial_Data_Organization_Information:
  Point_and_Vector_Object_Information:

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geodetic_Model:
      Horizontal_Datum_Name: D_WGS_1984
      Ellipsoid_Name: WGS_1984

Lineage:

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