 class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"overwrite"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>    elevation <span class="op">=</span> <span class="st">"elevation.dem"</span>,</span></span>
<span class="r-in"><span>    slope <span class="op">=</span> <span class="st">"slope"</span>,</span></span>
<span class="r-in"><span>    aspect <span class="op">=</span> <span cla