[GRASS-SVN] r65553 - grass/trunk/raster/r.slope.aspect

[svn_grass at osgeo.org]

Author: mlennert
Date: 2015-07-09 04:27:39 -0700 (Thu, 09 Jul 2015)
New Revision: 65553

Modified:
   grass/trunk/raster/r.slope.aspect/r.slope.aspect.html
Log:
Added hint on transformation of ccw aspect to azimuth


Modified: grass/trunk/raster/r.slope.aspect/r.slope.aspect.html
===================================================================
--- grass/trunk/raster/r.slope.aspect/r.slope.aspect.html	2015-07-09 09:17:56 UTC (rev 65552)
+++ grass/trunk/raster/r.slope.aspect/r.slope.aspect.html	2015-07-09 11:27:39 UTC (rev 65553)
@@ -23,6 +23,10 @@
 and color table files are also generated for the aspect raster map. The aspect
 categories represent the number degrees of east and they increase
 counterclockwise: 90 degrees is North, 180 is West, 270 is South 360 is East.
+These values can be transformed to azimuth (0 is North, 90 is East, etc) values using <a href="r.mapcalc.html">r.mapcalc</a>:
+<div class="code"><pre>
+r.mapcalc "azimuth_aspect = (450 - ccw_aspect) % 360"
+</pre></div>
 
 <p>
 The aspect is not defined for slope equal to zero.