anchor.diff:              <dd>10 years</dd>
             </dl> -->
             <dl class='sources_row'>
  +            <dt>Frequency of updates</dt>
  +            <dd>None planned</dd>
  +          </dl>
  +          <dl class='sources_row even'>
               <dt>Date of content</dt>
               <dd>2000</dd>
             </dl>
  
positive.code:         <div class='source_table'>
            <dl class='sources_row'>
              <dt>Function</dt>
              <dd>The Population Density layer measures human population per square km.</dd>
            </dl>
            <dl class='sources_row even'>
              <dt>Resolution/scale</dt>
              <dd>Square Km Grid (30 Arc Seconds)</dd>
            </dl>
            <dl class='sources_row'>
              <dt>Geographic coverage</dt>
  
negative.code:       <div class='source_body'>
          <div class='source_summary'>
            <h3 class='overview_title'>Overview</h3>
            <p>“The Global Rural-Urban Mapping Project, Version 1 (GRUMPv1) consists of estimates of human population for the years 1990, 1995, and 2000 in a 1 kilometer global grid. The population density grids measure population per square kilometer.</p>
  
            <p>A proportional allocation gridding algorithm, utilizing more than 1,000,000 national and sub-national geographic units, is used to assign population values to grid cells. The population count grids are divided by the land area grid to produce population densities. This data set is produced by the Columbia University Center for International Earth Science Information Network (CIESIN) in collaboration with the International Food Policy Research Institute (IFPRI), the World Bank, and Centro Internacional de Agricultura Tropical (CIAT).</p>
  
            <p class='credits'><strong>Citation:</strong> Global Rural-Urban Mapping Project, Version 1 (GRUMPv1) D.L. Balk, U. Deichmann, G. Yetman, F. Pozzi, S.I. Hay and A. Nelson. Determining Global Population Distribution: Methods, Applications and Data., Advances in Parasitology 62: 119-156, 2006. <a href='http://www.globalforestwatch.org' target='_blank'>www.globalforestwatch.org</a>.</p>
  
  