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<h2>DESCRIPTION</h2>
<em>v.net.iso</em> splits net to bands between cost isolines (direction from
centre). Centre node must be opened (costs >= 0). Costs of centre node are
used in calculation. Supported are cost assignments for both arcs and nodes,
and also different in both directions of a vector line. For areas cost will
be calculated along boundary lines.
<h2>NOTES</h2>
Nodes must be on the isolines.<P>
Center nodes have to be assigned to vector nodes. Nodes and arcs can be closed
using cost = -1.
<h2>EXAMPLE</h2>
Subdivision of a network into areas:<br>
The map must contain at least one center
(point) on the vector network which can be patched into with
<a HREF="v.patch.html">v.patch</a>.
<pre>
v.net.iso input=streets output=isomap ccats=1 costs=1000,2000,5000
</pre>
that should cut network to 4 categories:
<pre>
cat | distance from point
1 0 - 1000
2 1000 - 2000
3 2000 - 5000
4 > 5000
</pre>
To see the result, run for example:
<pre>
d.vect isomap col=green cats=1
d.vect isomap col=yellow cats=2
d.vect isomap col=orange cats=3
d.vect isomap col=red cats=4
</pre>
<h2>SEE ALSO</h2>
<em><a HREF="d.path.html">d.path</a></em>,
<em><a HREF="v.net.alloc.html">v.net.alloc</a></em>,
<em><a HREF="v.net.salesman.html">v.net.salesman</a></em>,
<em><a HREF="v.net.steiner.html">v.net.steiner</a></em>,
<em><a HREF="v.patch.html">v.patch</a></em>
<h2>AUTHOR</h2>
Radim Blazek, ITC-Irst, Trento, Italy
<p><i>Last changed: $Date: 2004/12/01 08:28:48 $</i>
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