Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Geologic_Map_50k
    Attribute:
      Attribute_Label: FID
      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: Code
    Attribute:
      Attribute_Label: MapUnit
    Attribute:
      Attribute_Label: Formation
    Attribute:
      Attribute_Label: Epoch
    Attribute:
      Attribute_Label: Area_acres
    Attribute:
      Attribute_Label: Area_ha
    Attribute:
      Attribute_Label: Area_m2
    Attribute:
      Attribute_Label: Perimtr_m
    Attribute:
      Attribute_Label: Perimtr_mi
Identification_Information:
  Description:
    Abstract: This dataset was created to provide a geospatial overlay of the recent update of the Geologic Map of Guam (2008) by Siegrist, H.G. and Reagan, M.K. The map was originally published in 2008 as a 1:50,000-scale hard-copy map and in digital format as PDFs consisting of nine 1:24,000-scale and one 1:50,000-scale (the latter was used for this dataset).
    Purpose: To provide a georectified image of the 1:50,000-scale Geology of Guam map (updated in 2008).
  Data_Set_Credit: H.G. Siegrist, Jr and Mark K. Reagan. Additional contributions to the map in form of field interpretations were made by Richard H. Randall and John W. Jenson. Digital cartography in Adobe Illustrator by Linda Masonic (USGS). Geographic Information System (GIS) database by Maria Kottermair, University of Guam (WERI).
  Point_of_Contact:
    Contact_Information:
      Contact_Position: Professor of Environmental Geology
      Contact_Address:
        Address_Type: mailing and physical address
        Address: University Drive
        City: Mangilao
        State_or_Province: Guam
        Postal_Code: 92923
        Country: U.S.A.
      Contact_Electronic_Mail_Address: jjenson@uguam.uog.edu
      Contact_Voice_Telephone: 671-735-2689
      Contact_Organization_Primary:
        Contact_Organization: Water & Environmental Research Institute (WERI), University of Guam
        Contact_Person: Dr. John Jenson
  Citation:
    Citation_Information:
      Originator: Water & Environmental Research Institute, University of Guam
      Publication_Date: 2012
      Title: Georeferenced Geologic Map and Sections of Guam
      Online_Linkage: www.hydroguam.net
      Geospatial_Data_Presentation_Form: raster digital data
  Keywords:
    Theme:
      Theme_Keyword: Geologic Map of Guam
      Theme_Keyword: geologic features
      Theme_Keyword: digital raster graphic
      Theme_Keyword: geology
      Theme_Keyword: DRG
      Theme_Keyword: georectified
    Place:
      Place_Keyword: Guam
      Place_Keyword: Mariana Islands
      Place_Keyword: Pacific Islands
      Place_Keyword: Western Pacific
      Place_Keyword: Northwestern Pacific
      Place_Keyword: United States Possesion
  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2008
    Currentness_Reference: publication date
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Use_Constraints: Dataset is for planning purpose only, not for use in litigation. 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_Quality_Information:
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: H.G. Siegrist, Jr and Mark K. Reagan
          Publication_Date: 2008
          Title: Geologic Map and Sections of Guam, Mariana Islands
          Other_Citation_Details: Siegrist, H.G., and Reagan, M.K. 2008. Geologic Map and Sections of Guam, Mariana Islands (1:50,000), Revisions of original map from USGS Professional Report 403A, 1964, by Tracey, J.I., Jr., Schlanger, S.O., Stark, J.T., Doan, D.B. & May, H.G.
          Online_Linkage: http://www.weriguam.org/locally-sponsored-research/guam-hydrologic-survey/page/geologic-maps.html
      Type_of_Source_Media: PDF files
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2008
        Source_Currentness_Reference: publication date
      Source_Contribution: Primary source for on-screen digitizing.
    Process_Step:
      Process_Description: The Geologic Map of Guam (1:50,000) in PDF-format was exported to TIFF in Adobe Photoshop. The map was then imported to ArcMap and georeferenced using over 40 ground control points (GCPs). A first order polynomial (affine) transformation was used to rectify the image.
      Process_Date: 2011
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: Maria Kottermair
            Contact_Organization: Water & Environmental Research Institute, University of Guam
          Contact_Position: Research Assistant III (GIS Analyst)
          Contact_Voice_Telephone: 671-735-2685
          Contact_Electronic_Mail_Address: mariakottermair@uguamlive.uog.edu
  Attribute_Accuracy:
  Completeness_Report: This dataset is considered complete.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: No positional accuracy assessment has been performed in the field. Positional accuracy relative to the USGS Topo quadrangle maps and the geologic quadrangle maps is between 12-25 meters.
Metadata_Reference_Information:
  Metadata_Date: 20120921
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  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 (GIS Analyst)
      Contact_Voice_Telephone: 671-735-2685
      Contact_Electronic_Mail_Address: mariakottermair@uguamlive.uog.edu
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geodetic_Model:
      Horizontal_Datum_Name: D_WGS_1984
      Ellipsoid_Name: WGS_1984
    Planar:
      Planar_Coordinate_Information:
        Planar_Distance_Units: meters
        Coordinate_Representation:
          Abscissa_Resolution: 2.000000
          Ordinate_Resolution: 2.000000
Spatial_Data_Organization_Information:
  Point_and_Vector_Object_Information:
