model. This approach calculates geometric gap
probabilities which decreases with increasing distance from the TLS
device and follow a Poisson distribution. The calculations of stand
density, volume and basal area are corrected with a factor accounting
for the gap probabilities and the corrected variables are called
<strong><code>N.pam</code></strong>, <strong><code>V.pam</code></strong>
and <strong><code>G.pam</code></strong> respectively. For further
details see Strahler et al. (2008<a class="footnote-ref