[GRASS-SVN] r35075 - grass/branches/releasebranch_6_4/raster/r.slope.aspect

[svn_grass at osgeo.org]

Author: neteler
Date: 2008-12-28 04:25:48 -0500 (Sun, 28 Dec 2008)
New Revision: 35075

Modified:
   grass/branches/releasebranch_6_4/raster/r.slope.aspect/description.html
Log:
helena: reference where to find equations used in the module added (backport from trunk)

Modified: grass/branches/releasebranch_6_4/raster/r.slope.aspect/description.html
===================================================================
--- grass/branches/releasebranch_6_4/raster/r.slope.aspect/description.html	2008-12-28 08:20:29 UTC (rev 35074)
+++ grass/branches/releasebranch_6_4/raster/r.slope.aspect/description.html	2008-12-28 09:25:48 UTC (rev 35075)
@@ -35,12 +35,12 @@
 <table width="100%" border="0">
  <tr valign="baseline">
   <td>
-  <div align="center">
+  <center>
     <img src="dem.png" border="1">
     <P>
     Example DEM
     <BR><BR>
-  </div>
+  </center>
   </td>
   <td>
   </td>
@@ -48,39 +48,39 @@
 
  <tr valign="baseline">
   <td>
-  <div align="center">
+  <center>
     <img src="slope.png" border="1">
     <P>
     Slope (degree) from example DEM
     <BR><BR>
-  </div>
+  </center>
   </td>
   <td>
-  <div align="center">
+  <center>
     <img src="aspect.png" border="1">
     <P>
     Aspect (degree) from example DEM
     <BR><BR>
-  </div>
+  </center>
   </td>
  </tr>
 
  <tr valign="baseline">
   <td>
-  <div align="center">
+  <center>
     <img src="tcurv.png" border="1">
     <P>
     Tangential curvature (m<sup>-1</sup>) from example DEM
     <BR><BR>
-  </div>
+  </center>
   </td>
   <td>
-  <div align="center">
+  <center>
     <img src="pcurv.png" border="1">
     <P>
     Profile curvature (m<sup>-1</sup>) from example DEM
     <BR><BR>
-  </div>
+  </center>
   </td>
   <td>
   </td>
@@ -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>,