v.surf.rst manual: example changed from Spearfish to North Carolina dataset

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73193 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.surf.rst/v.surf.rst.html

@@ -299,30 +299,31 @@ Using the <b>where</b> parameter, the interpolation can be limited to
 use only a subset of the input vectors.
 
 <p>
-Spearfish example (we simulate randomly distributed elevation
-measures):
+North Carolina example (we simulate randomly distributed elevation
+measures which we interpolate to a gap-free elevation surface):
 
 <div class="code"><pre>
-g.region raster=elevation.10m -p
-# random elevation extraction
-r.random elevation.10m vector_output=elevrand n=200
+g.region raster=elevation -p
+# random elevation extraction of 500 samplings
+r.random elevation vector_output=elevrand n=500
 v.info -c elevrand
 v.db.select elevrand
 
 # interpolation based on all points
 v.surf.rst elevrand zcol=value elevation=elev_full
-r.colors elev_full rast=elevation.10m
+# apply the color table of the original raster map
+r.colors elev_full raster=elevation
 d.rast elev_full
 d.vect elevrand
 
 # interpolation based on subset of points (only those over 1300m/asl)
 v.surf.rst elevrand zcol=value elevation=elev_partial where="value > 1300"
-r.colors elev_partial rast=elevation.10m
+r.colors elev_partial raster=elevation
 d.rast elev_partial
 d.vect elevrand where="value > 1300"
 </pre></div>
 
-<h2> REFERENCES</h2>
+<h2>REFERENCES</h2>
 
 <ul>
   <li><a href="http://www4.ncsu.edu/~hmitaso/gmslab/papers/IEEEGRSL2005.pdf">