vec</code> contains a scale of extent/2, all the cells are border
cells; if it contains extent/4, 75% of the cells are border cells. For
this reason, the <code>area</code> method may be better suited for
larger areas, relative to the <code>lvec</code>.</p>
<p>Below a fractal 128 x 128 terrain is simulated and fractal dimension
is estimated with the height variation method. Because no
<code>lvec</code> was provided, one was generated as
<code>c(8, 16, 32, 64, 128)</code>.</p>
<div class="sourceCode" id="cb2"