[GRASS-SVN] r48364 - grass/branches/develbranch_6/imagery/i.topo.corr

[svn_grass at osgeo.org]

Author: neteler
Date: 2011-09-19 08:26:00 -0700 (Mon, 19 Sep 2011)
New Revision: 48364

Modified:
   grass/branches/develbranch_6/imagery/i.topo.corr/description.html
Log:
correct cosine formula

Modified: grass/branches/develbranch_6/imagery/i.topo.corr/description.html
===================================================================
--- grass/branches/develbranch_6/imagery/i.topo.corr/description.html	2011-09-19 15:25:16 UTC (rev 48363)
+++ grass/branches/develbranch_6/imagery/i.topo.corr/description.html	2011-09-19 15:26:00 UTC (rev 48364)
@@ -11,7 +11,7 @@
 Using flag -i and given an elevation map as basemap (UTM),
 <em>i.topo.corr</em> permits to obtain a simple illumination model from the formula:
 <ul>
-	<li> cos_i = cos(s) * cos(z) + sin(s) * sin(z) * sin(a - o) </li>
+	<li> cos_i = cos(s) * cos(z) + sin(s) * sin(z) * cos(a - o) </li>
 </ul>
 where,
 <em>s</em> is the terrain slope angle, <em>z</em> is the solar zenith angle,