Identification_Information:
  Citation:
    Citation_Information:
      Originator: Rukstales, Kenneth S.
      Originator: Love, Jeffrey J.
      Publication_Date: 2007
      Title: Vertical Component Chart (Sheet 4 of 5) [coverage containing polygons and arcs, igrf2005z]
      Edition: version 1.0
      Geospatial_Data_Presentation_Form: Map
      Series_Information:
        Series_Name: U.S. Geological Survey Scientific Investigations Map
        Issue_Identification: 2964
      Publication_Information:
        Publication_Place: Denver, Colorado
        Publisher: U.S. Geological Survey
      Online_Linkage: http://pubs.usgs.gov/sim/2007/2964/
      Larger_Work_Citation:
        Citation_Information:
          Originator: Rukstales, Kenneth S.
          Originator: Love, Jeffrey J.
          Publication_Date: 2007
          Title: The International Geomagnetic Reference Field, 2005
          Edition: version 1.0
          Geospatial_Data_Presentation_Form: Map
          Series_Information:
            Series_Name: U.S. Geological Survey Scientific Investigations Map
            Issue_Identification: 2964
          Publication_Information:
            Publication_Place: Denver, Colorado
            Publisher: U.S. Geological Survey
          Online_Linkage: http://pubs.usgs.gov/sim/2007/2964/
  Description:
    Abstract: This is one of five world charts showing the declination, inclination, horizontal intensity, vertical component, and total intensity of the Earth's magnetic field at mean sea level at the beginning of 2005.  This particular data set is for the vertical component of the Earth's magnetic field.  The charts are based on the 10th generation International Geomagnetic Reference Field (IGRF-10) main model for 2005 and secular change model for 2005-2010.  The IGRF is referenced to the World Geodetic System 1984 ellipsoid.
    Purpose: This map is intended to show the Earth's main magnetic field and its annual rate of change (secular variation) based on the 10th generation International Geomagnetic Reference Field (IGRF-10).  The IGRF is a mathematical model of the Earth's main magnetic field and its secular variation based upon data from magnetic observatories and satellite magnetic missions.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 2005
        Ending_Date: 2010
    Currentness_Reference: The basis on which the time period of content information is determined.
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: 5 years
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -180.000000
      East_Bounding_Coordinate: 180.000000
      North_Bounding_Coordinate: 90.000000
      South_Bounding_Coordinate: -90.000000
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: IGRF
      Theme_Keyword: Geomagnetic
      Theme_Keyword: Geomagnetism
      Theme_Keyword: Magnetic
      Theme_Keyword: Declination
      Theme_Keyword: International
  Access_Constraints: None
  Use_Constraints: The data are for the years 2005 - 2010.  Acknowledgment of the U.S. Geological Survey, Geomagnetism Program would be appreciated in products derived from these data.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Ken Rukstales
        Contact_Organization: U.S. Geological Survey - Geologic Hazards Team
      Contact_Address:
        Address_Type: mailing address
        Address: Box 25046, MS 966
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-273-8677
      Contact_Electronic_Mail_Address: rukstales@usgs.gov
  Browse_Graphic:
    Browse_Graphic_File_Name: http://pubs.usgs.gov/sim/2007/2964/2964-4.pdf
    Browse_Graphic_File_Description: Full-size, complete version of the vertical component chart of the International Geomagnetic Reference Field, 2005
    Browse_Graphic_File_Type: PDF
  Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcGIS 9.1 Service Pack 2
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: This data set is based on a mathematical model of the the Earth's magnetic field.  The accuracy of any magnetic field component attribute is dependent on the model's ability to calculate the Earth's magnetic field at any location on Earth.
  Logical_Consistency_Report: Polygon and chain-node topology are present.
  Completeness_Report: Data are complete.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: The location of features is based on a mathematical model of the Earth's magnetic field.  The location of each point is considered to be correct within the confines of computer accuracy.
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: The data are computed at mean sea level based on the mathematical model of the Earth's magnetic field.
  Lineage:
    Process_Step:
      Process_Description: The associated vertical component, based on the 10th generation International Geomagnetic Reference Field, was calculated for a grid of points, having a latitude and longitude spacing of 0.25 degrees.  The data were imported into a grid and contoured using ArcGIS.  The desired contours for the map were selected and polygon and arc topology were ascertained as well as appropriate feature attributes.
      Process_Date: 2005
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: Ken Rukstales
            Contact_Organization: U.S. Geological Survey - Geologic Hazards Team
          Contact_Address:
            Address_Type: mailing address
            Address: Box 25046,  MS 966
            City: Denver
            State_or_Province: Colorado
            Postal_Code: 80225
            Country: USA
          Contact_Voice_Telephone: 303-273-8677
          Contact_Electronic_Mail_Address: rukstales@usgs.gov
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Complete chain
      Point_and_Vector_Object_Count: 371
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Label point
      Point_and_Vector_Object_Count: 72
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 72
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Point
      Point_and_Vector_Object_Count: 4
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.000003
      Longitude_Resolution: 0.000003
      Geographic_Coordinate_Units: Decimal degrees
    Geodetic_Model:
      Horizontal_Datum_Name: D_WGS_1984
      Ellipsoid_Name: WGS_1984
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257224
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: igrf2005z arc
      Entity_Type_Definition: Contours of vertical component of the Earth's magnetic field based on the 10th generation International Geomagnetic Reference Field expressed in nanoTeslas.  The vertical component is the projection of the geomagnetic field vector onto an axis perpendicular to the tangent plane attached to a point on the Earth's surface.  The vertical component is considered positive or negative depending upon whether the north-seeking end of a balanced compass needle dips below or above the tangent plane, respectively.
      Entity_Type_Definition_Source: USGS
    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: FNODE#
      Attribute_Definition: Internal node number for the beginning of an arc (from-node).
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: TNODE#
      Attribute_Definition: Internal node number for the end of an arc (to-node).
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: LPOLY#
      Attribute_Definition: Internal node number for the left polygon.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: RPOLY#
      Attribute_Definition: Internal node number for the right polygon.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: 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.
    Attribute:
      Attribute_Label: IGRF2005Z#
      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: IGRF2005Z-ID
      Attribute_Definition: User-defined feature number.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: same as attribute_label Z
          Enumerated_Domain_Value_Definition: vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
    Attribute:
      Attribute_Label: Z
      Attribute_Definition: vertical component in units of nanoTeslas
      Attribute_Definition_Source: USGS
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: -99999
          Enumerated_Domain_Value_Definition: Not a valid contour of vertical component.  These arcs are used to make complete polygons along the boundary of the spatial extent of the data.
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -66000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -64000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -62000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -60000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -58000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -56000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -54000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -52000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -50000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -48000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -46000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -44000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -42000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -40000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -38000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -36000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -34000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -32000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -30000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -28000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -26000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -24000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -22000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -20000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -18000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: usgs
        Enumerated_Domain:
          Enumerated_Domain_Value: -16000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -14000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -12000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -10000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -8000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -6000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -4000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -2000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 0
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 2000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 4000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 6000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 8000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 10000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 12000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 14000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 16000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 18000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 20000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 22000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 24000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 26000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 28000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 30000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 32000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 34000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 36000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 38000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 40000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 42000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 44000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 46000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 48000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 50000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 52000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 54000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 56000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 58000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 60000
          Enumerated_Domain_Value_Definition: Contour of vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: igrf2005z polygon
      Entity_Type_Definition: Areas containing a specified range of values of vertical component of the Earth's magnetic field based on the 10th generation International Geomagnetic Reference Field expressed in nanoTeslas.  The vertical component is the projection of the geomagnetic field vector onto an axis perpendicular to the tangent plane attached to a point on the Earth's surface.  The vertical component is considered positive or negative depending upon whether the north-seeking end of a balanced compass needle dips below or above the tangent plane, respectively.
      Entity_Type_Definition_Source: USGS
    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: AREA
      Attribute_Definition: Area of feature in internal units squared.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Positive real numbers that are automatically generated.
    Attribute:
      Attribute_Label: PERIMETER
      Attribute_Definition: Perimeter of feature in internal units.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Positive real numbers that are automatically generated.
    Attribute:
      Attribute_Label: IGRF2005Z#
      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: IGRF2005Z-ID
      Attribute_Definition: User-defined feature number.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: same as attribute_label Z
          Enumerated_Domain_Value_Definition: vertical component in units of nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
    Attribute:
      Attribute_Label: Z
      Attribute_Definition: The minimum possible vertical component value within the polygon, in units of nanoTeslas
      Attribute_Definition_Source: USGS
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: -68000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -68000 to -66000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -66000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -66000 to -64000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -64000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -64000 to -62000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -62000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -62000 to -60000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -60000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -60000 to -58000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -58000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from -58000 to -56000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: -56000
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          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 24000 to 26000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 26000 to 28000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 28000 to 30000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 30000 to 32000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 32000 to 34000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 34000 to 36000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 36000 to 38000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 38000 to 40000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 40000 to 42000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 42000 to 44000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 44000
          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 44000 to 46000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 46000 to 48000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 48000 to 50000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 54000 to 56000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 56000 to 58000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 58000 to 60000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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          Enumerated_Domain_Value_Definition: Vertical component values within the polygon range from 60000 to 62000 nanoTeslas
          Enumerated_Domain_Value_Definition_Source: USGS
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: P.O. Box 25286, Mail Stop 306
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 1-888-ASK-USGS
      Contact_Facsimile_Telephone: 303-202-4693
      Contact_Electronic_Mail_Address: infoservices@usgs.gov
  Resource_Description:
    U.S. Geological Survey
    Scientific Investigations Map 2964
    The International Geomagnetic Reference Field, 2005
    Vertical Component Chart
    Sheet 4 of 5
    (Map-On-Demand)
  Distribution_Liability: Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
  Standard_Order_Process:
    Non-digital_Form: Available as one of five printed sheets.  Order from USGS at the address listed above or see  http://store.usgs.gov/mod/order.html for more ordering information.
    Fees: For current charges please see http://store.usgs.gov/mod/order.html
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: USGS, Denver Publishing Service Center
        Address: P.O. Box 25046,  Mail Stop 902
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-236-4845
      Contact_Facsimile_Telephone: 303-236-6287
      Contact_Electronic_Mail_Address: tpinto@usgs.gov
  Resource_Description:
    U.S. Geological Survey
    Scientific Investigations Map 2964
    The International Geomagnetic Reference Field, 2005
    Vertical Component Chart
    Sheet 4 of 5
  Distribution_Liability: Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: PDF
        Format_Version_Number: version 6.0
        Format_Specification: Adobe Portable Document Format
        Transfer_Size: 2.1 MB
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/sim/2007/2964/2964-4.pdf
    Fees: none
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: USGS, Denver Publishing Service Center
        Address: P.O. Box 25046, Mail Stop 902
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-236-4845
      Contact_Facsimile_Telephone: 303-236-6287
      Contact_Electronic_Mail_Address: tpinto@usgs.gov
  Resource_Description: Downloadable geospatial data sets in ArcInfo export format are available.
  Distribution_Liability: Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ARCE
        Format_Version_Number: 9.1
        Format_Specification: ArcGIS version 9.1 coverage format
        Format_Information_Content: The International Geomagnetic Reference Field, 2005, Vertical Component Chart
        File_Decompression_Technique: Files need to be decompressed using gzip, winzip, or similar utility
        Transfer_Size: 2.7 MB
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/sim/2007/2964/sim2964-4.zip
              Network_Resource_Name: http://pubs.usgs.gov/sim/2007/2964/sim2964-4.tar.gz
    Fees: none
Metadata_Reference_Information:
  Metadata_Date: 20070303
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Ken Rukstales
        Contact_Organization: U.S. Geological Survey - Geologic Hazards Team
      Contact_Address:
        Address_Type: mailing address
        Address: Box 25046,  MS 966
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-273-8677
      Contact_Electronic_Mail_Address: rukstales@usgs.gov
  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