Geografic-Information-System/scripts/r.plane/r.plane.html

<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>

<tt>g.region -c</tt> 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>
g.region -d
g.region -c
r.plane myplane45 dip=45 az=90 east=527500.0 north=165000.0 \
        elev=1000 type=FCELL
</pre></div>


<h2>AUTHOR</h2>

Stefan J&auml;ger (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

<p>
<i>Last changed: $Date$</i>