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<h2>DESCRIPTION</h2>
<em>r.plane</em> creates a tilted plane raster map given user-specified
parameters for inclination, azimuth, and the geographic location of a
point on the plane.<br>
The angle orientations of the <em>azimuth</em> parameter increase counter-clockwise,
i.e., 0 degree = N, 45 degree = NW, 90 degree = W etc.
<p>
Increasing values of the <em>dip</em> parameter progressively lower (or dip) the northern
half of the plane, and incline the southern half, assuming the <em>azimuth</em> parameter
is held constant at 0 degrees.
<h2>NOTES</h2>
<code>g.region -c</code> provides the easting and northing coordinates for
the center of the current region.
<p>
<em>CELL</em> (integer) maps take less disk space than <em>FCELL</em>s (floating point),
which in turn take up less space than <em>DCELL</em>s (double precision floating point).
<!-- is that true because of grass's compression? otherwise both int and float are both 4 bytes per cell -->
<h2>EXAMPLE</h2>
A tilted plane in the North Carolina sample dataset region:
<div class="code"><pre>
# set computational region
g.region raster=elev_lid792_1m -p
# get center coordinates as an example
g.region -c
# get terrain height at point
r.what map=elev_lid792_1m coordinates=638650.0,220375.0
# shows elevation: 116.7734
# generate tilted plane
r.plane myplane30 dip=30 az=75 east=638650.0 north=220375.0 \
elev=116.7734 type=FCELL
</pre></div>
<div align="center" style="margin: 10px">
<a href="r_plane_3d.png">
<img src="r_plane_3d.png" width="600" height="360" alt="r.plane example" border="0">
</a><br>
<i>Figure: Tilted plane shown in NVIZ along with elevation map</i>
</div>
<h2>AUTHORS</h2>
Stefan Jäger (1994), University of Heidelberg during a stay at USGS<br>
Updated to GRASS 5.7 by Michael Barton, Arizona State University<br>
Full rewrite for GRASS 7 by Glynn Clements
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