d</th>
<th align="left">Function</th>
<th align="left">Data</th>
<th align="left">Default <code>lvec</code>
</th>
<th align="left">Notes</th>
</tr></thead>
<tbody>
<tr class="odd">
<td align="left">Height variation</td>
<td align="left"><code>hvar</code></td>
<td align="left">RasterLayer</td>
<td align="left">2-10 x resolution to extent</td>
<td align="left">Invariant to height. Sensitive to non-fractal edges and
outliers.</td>
</tr>
<tr class="even">
<td align="left">Standard deviation</td>
<td align="left