[GRASS-SVN] r35022 - grass/trunk/raster/r.slope.aspect

[svn_grass at osgeo.org]

Author: helena
Date: 2008-12-26 00:03:38 -0500 (Fri, 26 Dec 2008)
New Revision: 35022

Modified:
   grass/trunk/raster/r.slope.aspect/r.slope.aspect.html
Log:
reference where to find equations used in the module added

Modified: grass/trunk/raster/r.slope.aspect/r.slope.aspect.html
===================================================================
--- grass/trunk/raster/r.slope.aspect/r.slope.aspect.html	2008-12-25 10:00:25 UTC (rev 35021)
+++ grass/trunk/raster/r.slope.aspect/r.slope.aspect.html	2008-12-26 05:03:38 UTC (rev 35022)
@@ -138,7 +138,7 @@
 the slope and aspect raster map layers.
 
 <p>
-Horn's formula is used to find the derivatives in x and y directions.
+Horn's formula is used to find the first order derivatives in x and y directions.
 
 <p>
 Only when using integer elevation models, the aspect is biased in 0,
@@ -159,6 +159,9 @@
 
 Horn, B. K. P. (1981). Hill Shading and the Reflectance Map, Proceedings
 of the IEEE, 69(1):14-47.
+Hofierka, J., Mitasova, H., Neteler, M., 2008. Geomorphometry in GRASS GIS. 
+In: Hengl, T. and Reuter, H.I. (Eds), Geomorphometry: Concepts, Software, Applications. 
+Developments in Soil Science, vol. 33, Elsevier, 387-410 pp.
 
 <h2>SEE ALSO</h2>
 <em><a href="r.mapcalc.html">r.mapcalc</a></em>,