Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: USGS Center for EROS
        Publication_Date: 200304
        Title: Color North America Shaded Relief  1-Kilometer Resolution
        Edition: 3
        Geospatial_Data_Presentation_Form: Map
        Publication_Information:
          Publication_Place: Reston, VA
          Publisher: National Atlas of the United States
        Online_Linkage: <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
    Description:
      Abstract:
        The North America Shaded Relief data were derived from the GTOPO30
        elevation data.  GTOPO30 is a global digital elevation model (DEM) with
        a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer).
        GTOPO30 was derived from several raster and vector sources of
        topographic information.  It was developed between 1993 and 1996 through
        a collaborative effort led by staff at the U.S. Geological Survey's EROS
        Data Center (EDC).  The following organizations participated by
        contributing funding or source data: the National Aeronautics and Space
        Administration (NASA), the United Nations Environment Programme/Global
        Resource Information Database (UNEP/GRID), the U.S. Agency for
        International Development (USAID), the Instituto Nacional de Estadistica
        Geografica e Informatica (INEGI) of Mexico, the Geographical Survey
        Institute (GSI) of Japan, Manaaki Whenua Landcare Research of New
        Zealand, and the Scientific Committee on Antarctic Research (SCAR).  This
        file is a replacement for the January 2003 map layer.  This map layer was
        previously distributed as North America Shaded Relief.
      Purpose:
        The Shaded Relief image was developed to portray the terrain of North
        America.  It is intended for visual purposes only.  The original GTOPO30
        data must be used for conducting analysis and determining elevation
        values.
      Supplemental_Information:
        The associated world file is included as part of the GeoTIFF.  The
        contents of the world file are:
        >1000.0000
        >0.000000
        >0.000000
        >-1000.0000
        >-6086129.0000
        >4488261.0000

        The following projection file can be used when using ESRI's ArcGIS to view
        the GeoTIFF (any line breaks should be removed):
        PROJCS["NAD_1983_Lambert_Azimuthal_Equal_Area",GEOGCS
        ["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID
        ["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],PROJECTION
        ["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0.0],
        PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",
        -100.0],PARAMETER["Latitude_Of_Origin",45.0],UNIT["Meter",1.0]]

    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 19930101
          Ending_Date: 200209
      Currentness_Reference: Dates of the elevation data
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: None planned
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: 166
        East_Bounding_Coordinate: -4
        North_Bounding_Coordinate: 83
        South_Bounding_Coordinate: 15
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: ISO 19115 Topic Category
        Theme_Keyword: elevation
        Theme_Keyword: imageryBaseMapsEarthCover
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: Digital Elevation Model
        Theme_Keyword: Shaded Relief
        Theme_Keyword: Topography
        Theme_Keyword: Topographic
        Theme_Keyword: DEM
        Theme_Keyword: GTOPO30
      Place:
        Place_Keyword_Thesaurus: None
        Place_Keyword: North America
        Place_Keyword: Canada
        Place_Keyword: Greenland
        Place_Keyword: Iceland
        Place_Keyword: United States
        Place_Keyword: Mexico
        Place_Keyword: Caribbean
        Place_Keyword: Puerto Rico
        Place_Keyword: Virgin Islands
        Place_Keyword: Alabama
        Place_Keyword: Alaska
        Place_Keyword: Arizona
        Place_Keyword: Arkansas
        Place_Keyword: California
        Place_Keyword: Colorado
        Place_Keyword: Connecticut
        Place_Keyword: Delaware
        Place_Keyword: District of Columbia
        Place_Keyword: Florida
        Place_Keyword: Georgia
        Place_Keyword: Hawaii
        Place_Keyword: Idaho
        Place_Keyword: Illinois
        Place_Keyword: Indiana
        Place_Keyword: Iowa
        Place_Keyword: Kansas
        Place_Keyword: Kentucky
        Place_Keyword: Louisiana
        Place_Keyword: Maine
        Place_Keyword: Maryland
        Place_Keyword: Massachusetts
        Place_Keyword: Michigan
        Place_Keyword: Minnesota
        Place_Keyword: Mississippi
        Place_Keyword: Missouri
        Place_Keyword: Montana
        Place_Keyword: Nebraska
        Place_Keyword: Nevada
        Place_Keyword: New Hampshire
        Place_Keyword: New Jersey
        Place_Keyword: New Mexico
        Place_Keyword: New York
        Place_Keyword: North Carolina
        Place_Keyword: North Dakota
        Place_Keyword: Ohio
        Place_Keyword: Oklahoma
        Place_Keyword: Oregon
        Place_Keyword: Pennsylvania
        Place_Keyword: Rhode Island
        Place_Keyword: South Carolina
        Place_Keyword: South Dakota
        Place_Keyword: Tennessee
        Place_Keyword: Texas
        Place_Keyword: Utah
        Place_Keyword: Vermont
        Place_Keyword: Virginia
        Place_Keyword: Washington
        Place_Keyword: West Virginia
        Place_Keyword: Wisconsin
        Place_Keyword: Wyoming
    Access_Constraints: None.
    Use_Constraints:
      None.  Acknowledgment of the U.S. Geological Survey, Center for EROS and
      (or) the National Atlas of the United States would be appreciated in
      products derived from these data.
    Point_of_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: John Hutchinson
          Contact_Organization: SAIC
        Contact_Address:
          Address_Type: Mailing address
          Address: USGS Center for EROS
          City: Sioux Falls
          State_or_Province: SD
          Postal_Code: 57198-0001
          Country: USA
        Contact_Voice_Telephone: 605-594-6049
        Contact_Electronic_Mail_Address: hutch@usgs.gov
    Native_Data_Set_Environment: 3-band TIFF format created using Arc/INFO 8.2

  Data_Quality_Information:
    Logical_Consistency_Report: No tests for logical consistency have been performed on this map layer.
    Completeness_Report:
      Data completeness reflects the content of the original GTOPO30 elevation
      data.
    Lineage:
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: U.S. Geological Survey
            Publication_Date: 1996
            Title: GTOPO30
            Edition: 1
            Publication_Information:
              Publication_Place: Sioux Falls, SD
              Publisher: USGS, Center for EROS
            Online_Linkage: <http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html>
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 1993
              Ending_Date: 1996
          Source_Currentness_Reference: Dates of the elevation data
        Source_Citation_Abbreviation: GTOPO30
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: USGS, Center for EROS
            Publication_Date: Unpublished material
            Title: North America Elevation Grid
        Type_of_Source_Media: Internal file
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19930101
              Ending_Date: 19961231
          Source_Currentness_Reference: Dates of the elevation data
        Source_Citation_Abbreviation: Elevation1999
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: National Atlas of the United States
            Publication_Date: 1999
            Title: North America Shaded Relief
            Publication_Information:
              Publication_Place: Reston, VA
              Publisher: National Atlas of the United States
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19930101
              Ending_Date: 19961231
          Source_Currentness_Reference: Dates of the elevation data
        Source_Citation_Abbreviation: Shade1999
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: U.S. Geological Survey
            Publication_Date: Unpublished material
            Title: October, 2001, update to GTOPO30
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 200110
          Source_Currentness_Reference: Date of data acquisition.
        Source_Citation_Abbreviation: 2001 Update
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: U.S. Geological Survey
            Publication_Date: Unpublished material
            Title: September, 2002, update to GTOPO30
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 200209
          Source_Currentness_Reference: Date of data acquisition.
        Source_Citation_Abbreviation: 2002 Update
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: U.S. Geological Survey
            Publication_Date: 1999
            Title: National Elevation Dataset
            Edition: 1
            Publication_Information:
              Publication_Place: Sioux Falls, SD
              Publisher: U.S. Geological Survey
            Online_Linkage: <http://ned.usgs.gov/>
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19990201
              Ending_Date: Unknown
          Source_Currentness_Reference: Dates of the elevation data.
        Source_Citation_Abbreviation: National Elevation Dataset
        Source_Contribution: Elevation information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: National Imagery and Mapping Agency
            Publication_Date: 1990
            Title: World Vector Shoreline
            Publication_Information:
              Publication_Place: Bethesda, MD
              Publisher: National Imagery and Mapping Agency
            Online_Linkage: <http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html>
        Type_of_Source_Media: Online
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 1990
          Source_Currentness_Reference: Publication date
        Source_Citation_Abbreviation: WVS
        Source_Contribution: Shoreline information.

      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: USGS, Center for EROS
            Publication_Date: Unpublished material
            Title: North America Elevation Grid
        Type_of_Source_Media: Internal file
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19930101
              Ending_Date: 200209
          Source_Currentness_Reference: Dates of the elevation data
        Source_Citation_Abbreviation: Elevation2002
        Source_Contribution: Elevation information.

      Process_Step:
        Process_Description:
          The mosaic of elevation data used for North America Shaded Relief was
          first assembled in 1999 for use on the National Atlas web site, and for
          a printed map at 1:10,000,000 scale published that same year.  The
          original 1999 map layer was assembled from the following tiles of
          GTOPO30 elevation data: w180n90, w140n90, w100n90, w060n90, w020n90,
          w180n40, w140n40, w100n40, w060n40, w020n40.  The tiles were ingested
          into Arc/INFO with the IMAGEGRID command.  The resulting grids were
          combined into a single grid with the MERGE function.  This grid was then
          projected into the Lambert Azimuthal Equal Area projection, centered on
          100 degrees West, 45 degrees North.  The .prj file used for the Arc
          PROJECT command contained these parameters:
          > INPUT
          > PROJECTION GEOGRAPHIC
          > UNITS DD
          > PARAMETERS
          > OUTPUT
          > PROJECTION LAMBERT_AZIMUTHAL
          > UNITS METERS
          > XSHIFT 0.0
          > YSHIFT 0.0
          > PARAMETERS
          > 0.0
          > -100 0 0
          > 45 0 0
          > 0.0
          > 0.0
          > END
          >
          The western edge of the grid was extended to match that of the National
          Atlas of the United States Map Maker bounding rectangle, and the null
          cells in the extended area were converted to ocean RGB values using CON.
        Source_Used_Citation_Abbreviation: GTOPO30
        Process_Date: 1999
        Source_Produced_Citation_Abbreviation: Elevation1999

      Process_Step:
        Process_Description:
          The color shaded relief rendition was created by combining two files:
          1. File one was a color elevation image, created by slicing the
          corrected elevation data using the ranges (listed in feet; divide by
          3.2808 to get meters) and RGB color values below.  This image file was
          converted in Adobe Photoshop from RGB to CMY (no black generated).

          >From    To     index     red     green   blue
          >---------------------------------------------------
          >-250    0      1         215     215     215
          >1       249    2         113     153     89
          >250     499    3         117     170     101
          >500     999    4         149     190     113
          >1000    1499   5         178     214     117
          >1500    1999   6         202     226     149
          >2000    2499   7         222     238     161
          >2500    2999   8         242     238     161
          >3000    3499   9         238     222     153
          >3500    3999   10        242     206     133
          >4000    4499   11        234     182     129
          >4500    4999   12        218     157     121
          >5000    5499   13        194     141     125
          >5500    5999   14        214     157     145
          >6000    6499   15        226     174     165
          >6500    6999   16        222     186     182
          >7000    7499   17        238     198     210
          >7500    7999   18        255     206     226
          >8000    8499   19        250     218     234
          >8500    8999   20        255     222     230
          >9000    9499   21        255     230     242
          >9500    9999   22        255     242     255
          >10000   19476  23        255     255     255
          >Water          24        132     193     255
          >

          2. File two was a grayscale shaded relief rendition of the elevation
          data, created with the Grid HILLSHADE command using these parameters:
          >azimuth = 315 degrees
          >sun elevation = 45 degrees
          >Shadetype = SHADE
          >Vertical exaggeration = 10.0
          File two was added as a black (K) band to file one (CMY), to create a
          CMYK color shaded relief image.  Overall contrast was enhanced and
          excessive shading around lake boundaries was lightened, then the CMYK
          image was converted in Photoshop to RGB for use in the online National
          Atlas.

          The file was converted to TIFF format using the command GRIDIMAGE to
          create the final TIFF file, Shdrlfi020l.tif with an accompanying .tfw
          world file.
        Source_Used_Citation_Abbreviation: Elevation1999
        Process_Date: 1999
        Source_Produced_Citation_Abbreviation: Shade1999

      Process_Step:
        Process_Description:
          In 2001 and 2002, some areas of the elevation mosaic were updated with
          improved data provided as internal files by science staff at EROS Data
          Center.  The first update, in October, 2001 featured two significant
          improvements:  1. Much of the GTOPO30 coverage of the conterminous
          United States was updated from higher resolution elevation data from the
          National Elevation Dataset;  2. Parts of northern Canada were corrected
          to remove a processing artifact that created an artificial pattern of
          "dimples" in the shaded relief.  These elevation data were used for a
          printed National Atlas product, the 2002 "Shaded Relief of North
          America" map published at 1:10,000,000 scale.

          In the second update, in September, 2002, data for Greenland were
          entirely replaced by a higher resolution dataset that, however, suffered
          from geometric distortion.  These new data for Greenland were adjusted
          to correct for geometric distortion in the northwest part of the island
          between the Robeson Channel and Cape Morris Jesup, and to improve
          registration with the coastline derived from World Vector Shoreline
          (WVS).  A link coverage was created in ArcEdit containing links between
          the original Greenland data and the new coastline.  The link coverage
          was used in the Arc ADJUST command to perform a linear transformation
          with bilinear resampling on the original image, stored as an Arc/INFO
          grid dataset.  The resulting image is geometrically correct and fits the
          WVS coastline.  This correction was applied to data for Greenland only.
        Source_Used_Citation_Abbreviation: Elevation1999
        Source_Used_Citation_Abbreviation: 2001 Update
        Source_Used_Citation_Abbreviation: 2002 Update
        Source_Used_Citation_Abbreviation: National Elevation Dataset
        Source_Used_Citation_Abbreviation: WVS
        Process_Date: 200212
        Source_Produced_Citation_Abbreviation: Elevation2002

      Process_Step:
        Process_Description:
          The color shaded relief rendition was created by combining two files:
          1. File one was a color elevation image, created by slicing the
          corrected elevation data using the ranges (listed in feet; divide by
          3.2808 to get meters) and RGB color values below.  This image file was
          converted in Adobe Photoshop from RGB to CMY (no black generated).

          >From    To     index     red     green   blue
          >---------------------------------------------------
          >-250    0      1         215     215     215
          >1       249    2         113     153     89
          >250     499    3         117     170     101
          >500     999    4         149     190     113
          >1000    1499   5         178     214     117
          >1500    1999   6         202     226     149
          >2000    2499   7         222     238     161
          >2500    2999   8         242     238     161
          >3000    3499   9         238     222     153
          >3500    3999   10        242     206     133
          >4000    4499   11        234     182     129
          >4500    4999   12        218     157     121
          >5000    5499   13        194     141     125
          >5500    5999   14        214     157     145
          >6000    6499   15        226     174     165
          >6500    6999   16        222     186     182
          >7000    7499   17        238     198     210
          >7500    7999   18        255     206     226
          >8000    8499   19        250     218     234
          >8500    8999   20        255     222     230
          >9000    9499   21        255     230     242
          >9500    9999   22        255     242     255
          >10000   19476  23        255     255     255
          >Water          24        132     193     255
          >

          2. File two was a grayscale shaded relief rendition of the elevation
          data, created with the Grid HILLSHADE command using these parameters:
          >azimuth = 315 degrees
          >sun elevation = 45 degrees
          >Shadetype = SHADE
          >Vertical exaggeration = 10.0
          File two was added as a black (K) band to file one (CMY), to create a
          CMYK color shaded relief image.  Overall contrast was enhanced and
          excessive shading around lake boundaries was lightened, then the CMYK
          image was converted in Photoshop to RGB for use in the online National
          Atlas.

          This image contains color shaded relief in RGB color space.  For access
          to its sliced elevation and grayscale shaded relief components, or to
          the original 16-bit DEM data (Elevation2002), please contact the
          National Atlas.

          These same elevation data were also used for a printed National Atlas
          product, the 2002 "Shaded Relief of North America" map published at
          1:10,000,000 scale.  Updated source data and intermediate products, as
          well as the final color shaded relief image (in CMYK) used on the
          printed map, are also available from the National Atlas.
        Source_Used_Citation_Abbreviation: Elevation2002
        Process_Date: 200212

  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Raster
    Raster_Object_Information:
      Raster_Object_Type: Grid Cell
      Row_Count: 7273
      Column_Count: 10366
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Map_Projection:
          Map_Projection_Name: Lambert Azimuthal Equal Area
          Lambert_Azimuthal_Equal_Area:
            Longitude_of_Projection_Center: -100.00
            Latitude_of_Projection_Center: 45.00
            False_Easting: 0.0
            False_Northing: 0.0
        Planar_Coordinate_Information:
          Planar_Coordinate_Encoding_Method: Row and column
          Coordinate_Representation:
            Abscissa_Resolution: 1000.0
            Ordinate_Resolution: 1000.0
          Planar_Distance_Units: Meters
      Geodetic_Model:
        Horizontal_Datum_Name: None
        Ellipsoid_Name: Sphere
        Semi-major_Axis: 6370997.0
        Denominator_of_Flattening_Ratio: 1.0

  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: Shaded relief TIFF image grid cell
        Entity_Type_Definition: Any of the data elements in the shaded relief file.
        Entity_Type_Definition_Source: National Atlas of the United States
      Attribute:
        Attribute_Label: Shaded relief TIFF image red-green-blue values
        Attribute_Definition: Color values for the 3 bands of the TIFF image.
        Attribute_Definition_Source: National Atlas of the United States
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 89
            Range_Domain_Maximum: 255

  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: Earth Science Information Center, U.S. Geological Survey
        Contact_Address:
          Address_Type: Mailing address
          Address: 507 National Center
          City: Reston
          State_or_Province: VA
          Postal_Code: 20192
          Country: USA
        Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
        Contact_Voice_Telephone: 703-648-5920
        Contact_Instructions:
          In addition to the address above there are other ESIC offices
          throughout the country.  A full list of these offices is at
          <http://ask.usgs.gov/esic_index.html>.
    Distribution_Liability:
      Although these data have been processed successfully on a computer system
      at the U.S. Geological Survey, Center for EROS, no warranty expressed or
      implied is made by the U.S. Geological Survey regarding the utility of the
      data on any other system, nor shall the act of distribution constitute any
      such warranty.  Use of trademarks or formats does not constitute endorsement
      by the U.S. Geological Survey.  There are no copyright restrictions on the
      use, redistribution, or further processing of this map layer.  No
      responsibility is assumed by the U.S. Geological Survey in the use of these
      data.
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: TIFF
        Digital_Transfer_Option:
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
      Fees: There is no charge for the map layer.

  Metadata_Reference_Information:
    Metadata_Date: 20060829
    Metadata_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Peg Rawson
          Contact_Organization: National Atlas of the United States
        Contact_Address:
          Address_Type: Mailing address
          Address: 12201 Sunrise Valley Drive
          Address: MS-561
          City: Reston
          State_or_Province: VA
          Postal_Code: 20192
          Country: USA
        Contact_Voice_Telephone: 703-648-4183
        Contact_Electronic_Mail_Address: atlasmail@usgs.gov
    Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Security_Information:
      Metadata_Security_Classification_System: None
      Metadata_Security_Classification: Unclassified
      Metadata_Security_Handling_Description: None