v.split manual: new NC examples (contributed by Milena Nowotarska)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@59320 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.split/v.split.html

@@ -3,26 +3,43 @@
 <em>v.split</em> split vector lines into shorter segments using a
 maximal distance between nodes.
 
-<h2>EXAMPLE</h2>
+<h2>EXAMPLES</h2>
 
-Spearfish location:
+The examples are based on the North Carolina sample data location.
 
-<div class="code"><pre>
-# insert kilometric nodes to railroad map:
-v.extract railroads out=myrr list=1
+<h3>Example 1: Inserting kilometric nodes to railroad map</h3>
 
-# join segments into polyline
-v.build.polylines myrr out=myrr_pol
-v.category myrr out=myrailroads option=add
+<div class="code"><pre>
+# extract data for this example
+v.extract railroads out=myrr cats=1
 
 # show line, category, direction (to find the beginning)
-d.vect myrailroads disp=shape,cat,dir
+d.vect myrr disp=shape,cat,dir
 
 # insert nodes at 1000m distance (max)
-v.split railroads out=myrailroads_split length=1000
-d.vect myrailroads_split disp=shape,topo
+v.split myrr out=mrr_split length=1000
+d.vect myrr_split disp=shape,topo
+</pre></div>
+
+Note: In case the data is not a polyline, build polylines in second step, eg.:
+
+<div class="code"><pre>
+# join segments into polyline
+v.build.polylines myrr out=myrr_poly
+v.category myrr_pol out=myrailroads option=add
 </pre></div>
 
+<h3>Example 2: Inserting kilometric vertices to railroad map</h3>
+
+Note: first run the two steps from example 1.
+
+<div class="code"><pre>
+# insert vertices at 1000m distance (max)
+v.split -n myrr out=myrr_split length=1000
+d.vect myrr_split disp=shape,topo
+</pre></div>
+
+
 <h2>SEE ALSO</h2>
 
 <em>