[GRASS-SVN] r54067 - grass/branches/develbranch_6/raster/r.surf.fractal

[svn_grass at osgeo.org]

Author: neteler
Date: 2012-11-26 16:19:37 -0800 (Mon, 26 Nov 2012)
New Revision: 54067

Added:
   grass/branches/develbranch_6/raster/r.surf.fractal/r_surf_fractal.jpg
Modified:
   grass/branches/develbranch_6/raster/r.surf.fractal/
   grass/branches/develbranch_6/raster/r.surf.fractal/description.html
Log:
+ example, +image


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--- grass/branches/develbranch_6/raster/r.surf.fractal/description.html	2012-11-27 00:18:53 UTC (rev 54066)
+++ grass/branches/develbranch_6/raster/r.surf.fractal/description.html	2012-11-27 00:19:37 UTC (rev 54067)
@@ -1,20 +1,57 @@
 <h2>DESCRIPTION</h2>
 
 <b>r.surf.fractal</b> creates a fractal surface of a given fractal
-dimension. Uses spectral synthesis method. Can create intermediate layers
-showing the build up of different spectral coefficients (see Saupe,
-pp.106-107 for an example of this).
+dimension. It uses the spectral synthesis method. The module can create
+intermediate layers showing the build up of different spectral coefficients
+(see Saupe, pp.106-107 for an example of this).
 
 <p>
 Use this module to generate naturally looking synthetical elevation models
 (DEM).
 
-
 <h2>NOTE</h2>
 This module requires the <a href="http://www.fftw.org">FFTW library</a>
 for computing Discrete Fourier Transforms.
 
+<h2>EXAMPLE</h2>
 
+<div class="code"><pre>
+# D=2.0005
+g.region -dp
+r.surf.fractal out=dem_d2_0005 dim=2.0005
+r.info -r dem_d2_0005
+r.mapcalc "dem_d2_0005_final = 1.0 * dem_d2_0005 + abs(min(dem_d2_0005))"
+r.colors dem_d2_0005_final color=terrain
+r.slope.aspect dem_d2_0005_final aspect=dem_d2_0005_final_as
+
+# D=2.90
+r.surf.fractal out=dem_d2_90 dim=2.90
+r.info -r dem_d2_90
+r.mapcalc "dem_d2_90_final = 1.0 * dem_d2_90 + abs(min(dem_d2_90))"
+r.colors dem_d2_90_final color=terrain
+r.slope.aspect dem_d2_90_final aspect=dem_d2_90_final_as
+
+d.mon x0
+d.erase -f
+d.split.frame
+d.frame -s uno
+d.rast dem_d2_0005_final
+d.frame -s dos
+d.rast dem_d2_0005_final_as
+d.frame -s tres
+d.rast dem_d2_90_final
+d.frame -s cuatro
+d.rast dem_d2_90_final_as
+</pre></div>
+
+<center>
+<img src="r_surf_fractal.jpg" alt="Artificial DEMs created with fractals"><br>
+Artificial DEMs created with fractals:<br>
+top: fractal dimension d=2.0005 (left: elevation map, right: aspect map)<br>
+top: fractal dimension d=2.90 (left: elevation map, right: aspect map)
+</center>
+
+
 <h2>REFERENCE</h2>
  Saupe, D. (1988) Algorithms for random fractals, in Barnsley M., 
  Devaney R., Mandelbrot B., Peitgen, H-O., Saupe D., and Voss R.

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