v.trees.param.html

<h2>DESCRIPTION</h2>

<em>v.trees.param</em> calculates various tree parameters for tree crowns
given as input vector map <b>treecrowns</b>.

The module returns following parameters: 
tree height, crown area, crown perimeter, NDVI per single tree, crown volume,
stem position, distance to nearest building and distance to nearest tree.

The module takes as input a raster map of the <b>ndsm</b> for computation
of the tree height, a raster map of the <b>ndvi</b> for computation of the
NDVI per single tree and a vector map of the <b>buildings</b> for computation
of the distance to the  nearest building.
<p>
Optionally, the parameters <b>dist_building</b> and <b>dist_tree</b>
can be given, determining the range within neighbouring buildings or trees
are searched for. First the region is set to the tree of interest, then the
region is extended in each direction by <b>dist_building</b> or
<b>dist_tree</b> (given in meters). By default <b>dist_building</b>
is unset, and <b>dist_tree</b> is set to 500 m.
<p>
The calculation can be done in parallel, with the number of parallel processes
given by <b>nprocs</b>.
<p>
Additionally the maximum memory to be used can be set by <b>memory</b>.

<h2>EXAMPLES</h2>

<h3>Example 1:</h3>

<div class="code"><pre>
v.trees.param ndsm=ndsm ndvi=ndvi buildings=hausumringe treecrowns=trees
</pre></div>

<h3>Example 2: run with 5 parallel processes</h3>

<div class="code"><pre>
v.trees.param ndsm=ndsm ndvi=ndvi buildings=hausumringe treecrowns=trees nprocs=5
</pre></div>

<h3>Example 3: with optional input of <b>dist_tree</b> and  <b>dist_building</b></h3>

<div class="code"><pre>
v.trees.param ndsm=ndsm ndvi=ndvi buildings=hausumringe treecrowns=trees dist_tree=500 dist_building=500
</pre></div>

<h2>SEE ALSO</h2>

<em>
  <a href="v.trees.param.worker.html">v.trees.param.worker</a>,
  <a href="https://grass.osgeo.org/grass-stable/manuals/v.to.db.html">v.to.db</a>,
  <a href="https://grass.osgeo.org/grass-stable/manuals/v.rast.stats.html">v.rast.stats</a>,
  <a href="https://grass.osgeo.org/grass-stable/manuals/r.distance.html">r.distance</a>,
  <a href="https://grass.osgeo.org/grass-stable/manuals/v.distance.html">v.distance</a>
</em>

<h2>AUTHOR</h2>

Lina Krisztian, <a href="https://www.mundialis.de/">mundialis GmbH &amp; Co. KG</a>, Germany