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    <titleInfo>
      <title>100-Meter Resolution Land/Water Mask of Alaska, 2013</title>
    </titleInfo>
    <name type="corporate">
      <namePart>Geological Survey (U.S.)</namePart>
      <role>
        <roleTerm authority="marcrelator" type="text">creator</roleTerm>
      </role>
    </name>
    <genre valueURI="http://id.loc.gov/authorities/genreForms/gf2011026297" authority="lcgft">Geospatial data</genre>
    <genre valueURI="http://rdvocab.info/termList/RDAContentType/1001" authority="rdacontent">cartographic dataset</genre>
    <typeOfResource>cartographic</typeOfResource>
    <typeOfResource>software, multimedia</typeOfResource>
    <physicalDescription>
      <form>Raster Dataset</form>
      <digitalOrigin>born digital</digitalOrigin>
    </physicalDescription>
    <language>
      <languageTerm authority="iso639-2b" type="code">eng</languageTerm>
    </language>
    <abstract lang="eng" displayLabel="Abstract">This raster layer is a100-meter resolution land and water mask in (GeoTIFF format) of the conterminous Alaska, with separate values for oceans and for land areas of the United States, Canada, Mexico, the Bahamas, and Cuba. This layer is part of the 1997-2014 edition of the National Atlas of the United States.</abstract>
    <abstract lang="eng" displayLabel="Purpose">This 100-meter resolution mask image is not intended to be shown as a map layer. Instead, it is a cartographic tool that may be used to identify, select, and adjust areas on other 100-meter resolution image data sets distributed by the National Atlas of the United States.</abstract>
    <note lang="eng" displayLabel="Preferred citation">U.S. Geological Survey. (2013). 100-Meter Resolution Land/Water Mask of Alaska, 2013. National Atlas of the United States. Available at: http://purl.stanford.edu/yw302ty6400.</note>
    <note displayLabel="Supplemental information">The following pixel values are used in this map layer: &gt;100 Ocean &gt;200 Land ? United States &gt;210 Land ? Canada &gt;240 Land ? Russia Included with the GeoTIFF are an auxiliary information file (.aux.xml), an image overview file (.ovr), a value attribute database file (.vat.dbf), a .tfw file (more information included below), and a .prj file (more information included below.) The contents of the associated world file (.tfw) are: &gt;100.0 &gt;0.0 &gt;0.0 &gt;-100.0 &gt;-3326950.0 &gt;2437950.0 The projection (.prj) file contains the following information: &gt; PROJCS["Albers_NAD83_Alaska", &gt;GEOGCS["GCS_North_American_1983", &gt;DATUM["D_North_American_1983", &gt;SPHEROID["GRS_1980",6378137.0,298.257222101]], &gt;PRIMEM["Greenwich",0.0], &gt;UNIT["Degree",0.0174532925199433]], &gt;PROJECTION["Albers"], &gt;PARAMETER["False_Easting",0.0], &gt;PARAMETER["False_Northing",0.0], &gt;PARAMETER["Central_Meridian",-154.0], &gt;PARAMETER["Standard_Parallel_1",55.0], &gt;PARAMETER["Standard_Parallel_2",65.0], &gt;PARAMETER["Latitude_Of_Origin",50.0], &gt;UNIT["Meter",1.0]] Data set extent in meters (Albers Equal-Area Conic projection) &gt;North 2438000 &gt;West -3327000 &gt;East 1654000 &gt;South 346000 There are no NULL or NODATA values in the GeoTIFF. Information about National Atlas Web services can be found on the Web Map and Web Feature Services page; see &lt;http://nationalatlas.gov/infodocs/webservices.html&gt;.</note>
    <note displayLabel="Use limitation">None. Acknowledgment of The National Atlas of the United States of America would be appreciated in products derived from these data.</note>
    <note displayLabel="WGS84 Cartographics">This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.</note>
    <subject authority="lcsh" lang="eng">
      <topic authority="lcsh" authorityURI="http://id.loc.gov/authorities/subjects.html">Landforms</topic>
    </subject>
    <subject authority="lcsh" lang="eng">
      <topic authority="lcsh" authorityURI="http://id.loc.gov/authorities/subjects.html">Bodies of water</topic>
    </subject>
    <subject authority="geonames" lang="eng">
      <geographic authority="geonames" authorityURI="http://www.geonames.org/ontology#" valueURI="http://sws.geonames.org/5879092/">Alaska</geographic>
    </subject>
    <subject>
      <temporal encoding="w3cdtf">2013</temporal>
    </subject>
    <subject authority="ISO19115TopicCategory">
      <topic authority="ISO19115TopicCategory" authorityURI="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_TopicCategoryCode" valueURI="imageryBaseMapsEarthCover">Imagery and Base Maps</topic>
    </subject>
    <subject authority="ISO19115TopicCategory">
      <topic authority="ISO19115TopicCategory" authorityURI="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_TopicCategoryCode" valueURI="oceans">Oceans</topic>
    </subject>
    <subject>
      <cartographics>
        <scale>Scale not given.</scale>
        <projection>Custom projection</projection>
        <coordinates>W 180&#xB0;--E 180&#xB0;/N 71&#xB0;57&#x2B9;17&#x2BA;--N 43&#xB0;3&#x2B9;12&#x2BA;</coordinates>
        <coordinates>W 180&#xB0;--E 179&#xB0;59&#x2B9;58&#x2BA;/N 71&#xB0;57&#x2B9;16&#x2BA;--N 43&#xB0;3&#x2B9;12&#x2BA;</coordinates>
      </cartographics>
    </subject>
    <subject displayLabel="WGS84" authority="EPSG" valueURI="http://opengis.net/def/crs/EPSG/0/4326">
      <cartographics>
        <projection>EPSG::4326</projection>
      </cartographics>
    </subject>
    <originInfo>
      <dateIssued encoding="w3cdtf" keyDate="yes">2013</dateIssued>
      <publisher>National Atlas of the United States</publisher>
    </originInfo>
    <location>
      <url usage="primary display">https://purl.stanford.edu/yw302ty6400</url>
    </location>
    <recordInfo>
      <languageOfCataloging>
        <languageTerm authority="iso639-2b" type="code">eng</languageTerm>
      </languageOfCataloging>
      <recordContentSource>Stanford</recordContentSource>
      <recordOrigin>This record was translated from ISO 19139 to MODS v.3 using an xsl transformation.</recordOrigin>
      <recordIdentifier>edu.stanford.purl:yw302ty6400</recordIdentifier>
    </recordInfo>
    <extension displayLabel="geo">
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        <rdf:Description rdf:about="http://purl.stanford.edu/yw302ty6400">
          <dc:format>image/tiff; format=GeoTIFF</dc:format>
          <dc:type>Dataset#Raster</dc:type>
          <gml:boundedBy>
            <gml:Envelope gml:srsName="EPSG:4326">
              <gml:lowerCorner>-179.9999845 43.0532272</gml:lowerCorner>
              <gml:upperCorner>179.9993566 71.9545187</gml:upperCorner>
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    <relatedItem type="host">
      <titleInfo>
        <title>National atlas of the United States of America, 1997-2014</title>
      </titleInfo>
      <location>
        <url>https://purl.stanford.edu/cv275yx9215</url>
      </location>
      <typeOfResource collection="yes"/>
    </relatedItem>
    <accessCondition type="useAndReproduction">This item is in the public domain.  There are no restrictions on use.</accessCondition>
    <accessCondition type="copyright">This work is in the Public Domain, meaning that it is not subject to copyright.</accessCondition>
  </mods>