<sup>2</sup></a>).</p>
<p>For the other two plot designs (circular fixed area and k-tree plots)
different occlusion correction approaches are applied. One approach is
based on distance sampling data and can therefore only be used when the
function <code>distance.sampling</code> was used (i.e., when the
<code>tree.ds</code> argument is specified other than
<code>NULL</code>). Functions based on point transect sampling that
describe how the probability of tree detection decreases with increasing
distance from