ate system</p></td>
    </tr>
    <tr>
      <th>lon</th>
      <td><p>column containing longitude values</p></td>
    </tr>
    <tr>
      <th>lat</th>
      <td><p>column containing latitude values</p></td>
    </tr>
    <tr>
      <th>elevation</th>
      <td><p>column containing the elevation values. Default 0</p></td>
    </tr>
    <tr>
      <th>polyline</th>
      <td><p>optional column of <code>data</code> containing the polylines, if using encoded polylines</p></td>
    </tr>
    <tr>
      <th>rad