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    <titleInfo>
      <title>Global 3G Cellular Towers, 2013</title>
    </titleInfo>
    <name type="corporate">
      <namePart>Collins Bartholomew Ltd.</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>Shapefile</form>
      <extent>0.007</extent>
      <digitalOrigin>born digital</digitalOrigin>
    </physicalDescription>
    <language>
      <languageTerm authority="iso639-2b" type="code">eng</languageTerm>
    </language>
    <abstract lang="eng" displayLabel="Abstract">This point shapefile contains locations of 3G mobile cellular towers around the world for 2013. The data is created from submissions made directly to Collins Bartholomew or the GSMA from mobile operators, which provide roaming detail for inclusion in the online mapping application known as Collins Mobile Coverage Web. The data is supplied with a nominal resolution of approximately 1km on the ground.</abstract>
    <abstract lang="eng" displayLabel="Purpose">This map can be used to locate and analyze mobile communications coverage on a global scale.</abstract>
    <note lang="eng" displayLabel="Preferred citation">Collins Bartholomew Ltd. (2014). Global 3G Cellular Towers, 2013. Collins Bartholomew Ltd. Available at: http://purl.stanford.edu/bt348dh6363</note>
    <note displayLabel="Supplemental information">Operators are asked to submit strong (&gt;= -92dBm) and variable (&gt;= -100dBm and &lt; 92dBm) signal strengths as part of their submissions. The data here includes both types but does not make a distinction between the two.</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">Global system for mobile communications</topic>
    </subject>
    <subject authority="lcsh" lang="eng">
      <topic authority="lcsh" authorityURI="http://id.loc.gov/authorities/subjects.html">Cell phone services industry</topic>
    </subject>
    <subject authority="geonames" lang="eng">
      <geographic authority="geonames" authorityURI="http://www.geonames.org/ontology#" valueURI="http://sws.geonames.org/6295630/">Earth</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="utilitiesCommunication">Utilities and Communication</topic>
    </subject>
    <subject authority="lcsh">
      <geographic authority="lcsh" valueURI="https://id.loc.gov/authorities/subjects/sh85040427">Earth (Planet)</geographic>
    </subject>
    <subject>
      <cartographics>
        <scale>Scale not given.</scale>
        <projection>EPSG::3857</projection>
        <coordinates>W 100&#xB0;--E 177&#xB0;58&#x2B9;19&#x2BA;/N 64&#xB0;47&#x2B9;36&#x2BA;--S 40&#xB0;</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">2014</dateIssued>
      <dateValid encoding="w3cdtf">2013</dateValid>
      <place>
        <placeTerm type="text">Glasgow, GB</placeTerm>
      </place>
      <publisher>Collins Bartholomew Ltd.</publisher>
    </originInfo>
    <location>
      <url usage="primary display">https://purl.stanford.edu/bt348dh6363</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:bt348dh6363</recordIdentifier>
    </recordInfo>
    <extension displayLabel="geo">
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        <rdf:Description rdf:about="http://purl.stanford.edu/bt348dh6363">
          <dc:format>application/x-esri-shapefile; format=Shapefile</dc:format>
          <dc:type>Dataset#Point</dc:type>
          <gml:boundedBy>
            <gml:Envelope gml:srsName="EPSG:4326">
              <gml:lowerCorner>-100.0 -40.0</gml:lowerCorner>
              <gml:upperCorner>177.972 64.793404</gml:upperCorner>
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        </rdf:Description>
      </rdf:RDF>
    </extension>
    <relatedItem type="host">
      <titleInfo>
        <title>Collins Mobile Coverage Explorer</title>
      </titleInfo>
      <location>
        <url>https://purl.stanford.edu/vh286rq6087</url>
      </location>
      <typeOfResource collection="yes"/>
    </relatedItem>
    <accessCondition type="useAndReproduction">These data are licensed by Stanford Libraries and are available to Stanford University affiliates only. Affiliates are limited to current faculty, staff and students. Non affiliates seeking access should contact the publisher directly. These data may not be reproduced or used for any purpose without permission.</accessCondition>
    <accessCondition type="copyright">Copyright ownership resides with the originator.</accessCondition>
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