2>
<p>Natural surfaces often have anomalies such as peaks, troughs and
edges that can result in biased fractal dimension estimates. It is up to
the user to determine which method is best for their purposes, and to
demonstrate that a biological or ecological result is robust to the
choice of method. The function <code><a href="../reference/detect_drop.html">detect_drop()</a></code> can help to
investigate if a DEM has a lot of overhangs or sudden drops. It returns
a raster where values mark the areas with su