li>
          <a href="../articles/preprocessing_subnational_statistics.html">2.1. Pre-processing - subnational statistics</a>
        </li>
        <li>
          <a href="../articles/preprocessing_spatial_data.html">2.2. Pre-processing - spatial data</a>
        </li>
        <li>
          <a href="../articles/preprocessing_cropland.html">2.3. Pre-processing - cropland</a>
        </li>
        <li>
          <a href="../articles/preprocessing_irrigated_area.html">2.4. Pre-processing - irrigated area</a>