<?xml version="1.0"?>
<!DOCTYPE ADL-bucket-report SYSTEM
  "http://www.alexandria.ucsb.edu/middleware/dtds/ADL-bucket-report.dtd">
<ADL-bucket-report>
  <identifier>drg_24k_ca:$main.ocode$</identifier>
  <bucket name="adl:titles">
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.1/8.4"
        name="[FGDC] Citation - Title"/>
      <text>$main.title$</text>
    </textual-value>
  </bucket>
  <bucket name="adl:geographic-locations">
    <spatial-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.5.1"
        name="[FGDC] Bounding Coordinates"/>
      <box>
        <north>$main.n_b_coord$</north>
        <south>$main.s_b_coord$</south>
        <east>$main.e_b_coord$</east>
        <west>$main.w_b_coord$</west>
      </box>
    </spatial-value>
  </bucket>
  <bucket name="adl:dates">
    <temporal-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.3/9.1.1"
        name="[FGDC] Time Period of Content - Calendar Date"/>
      <date>$main.year$</date>
    </temporal-value>
  </bucket>
  <bucket name="adl:types">
    <hierarchical-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.1/8.6"
        name="[FGDC] Citation - Geospatial Data Presentation Form"/>
      <term vocabulary="ADL Object Type Thesaurus">maps</term>
    </hierarchical-value>
  </bucket>
  <bucket name="adl:formats">
    <hierarchical-value>
      <field uri="tag:fgdc.gov,2003:csdgm/6.4.2.1.1"
        name="[FGDC] Format Name"/>
      <term vocabulary="ADL Object Format Thesaurus">TIFF</term>
    </hierarchical-value>
  </bucket>
  <bucket name="adl:subject-related-text">
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.2.1" name="[FGDC] Abstract"/>
      <text>A digital raster graphic (DRG) is a scanned image of a
        U.S. Geological Survey (USGS) topographic map. The scanned
        image includes all map collar information. The image inside
        the map neatline is georeferenced to the surface of the Earth.
        The DRG can be used to collect, review, and revise other
        digital data, especially digital line graphs (DLG). When the
        DRG is combined with other digital products, such as digital
        orthophoto quadrangles (DOQ) or digital elevation models
        (DEM), the resulting image provides additional visual
        information for the extraction and revision of base
        cartographic information. The USGS is producing DRG's of the
        1:24,000-,1:24,000/1:25,000-, 1:63,360- (Alaska), 1:100,000-,
        and 1:250,000-scale topographic map series.</text>
    </textual-value>
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.2.2" name="[FGDC] Purpose"/>
      <text>The DRG is used for validating digital line graphs (DLG's)
        and for DLG data collection and revision. The DRG can help
        assess the completeness of digital data from other mapping
        agencies. It can also be used to produce "hybrid" products.
        These include combined DRG's and DOQ's for revising and
        collecting digital data, DRG's and DEM's for creating
        shaded-relief DRG's, and combinations of DRG, DOQ, and DLG
        data. Although a standard DRG is an effective mapping tool,
        its full potential for digital production is realized in
        combination with other digital data.</text>
    </textual-value>
  </bucket>
  <bucket name="adl:assigned-terms">
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.6.1.2"
        name="[FGDC] Theme Keyword"/>
      <text>digital elevation model; DEM; digital terrain model;
        contour line; digital contours; DOQ; digital orthophoto;
        digital orthophotoquad; digital image map; aerial photograph;
        paper map; map; digital line graph; U.S. Public Land Survey
        System; hydrography; transportation; topographic; Universal
        Transverse Mercator (UTM); scanner; raster; digital
        image</text>
    </textual-value>
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.6.2.2"
        name="[FGDC] Place Keyword"/>
      <text>US; United States; $main.mapname$; $main.state$</text>
    </textual-value>
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.6.4.2"
        name="[FGDC] Temporal Keyword"/>
      <text>true ground conditions</text>
    </textual-value>
  </bucket>
  <bucket name="adl:originators">
    <textual-value>
      <field uri="tag:fgdc.gov,2003:csdgm/1.1/8.1"
        name="[FGDC] Citation - Originator"/>
      <text>U.S. Geological Survey (USGS); Stephen P. Teale Data Center</text>
    </textual-value>
  </bucket>
  <bucket name="adl:identifiers">
    <identification-value>
      <mapped-identifier
        namespace="USGS DRG ocode">$main.ocode$</mapped-identifier>
    </identification-value>
  </bucket>
</ADL-bucket-report>