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<h2>DESCRIPTION</h2>
<em>v.overlay</em> allows the user to overlay to vector area maps.
There are 3 links attached to features in output map,
<ul>
<li><b>field 1</b>: link to the new table, new table has 3 columns
<ul>
<li><b>cat</b> - key column linking rows to features
<li><b>cata</b> - category of <i>afield</i> from <i>ainput</i>
<li><b>catb</b> - category of <i>bfield</i> from <i>binput</i>
</ul>
<li><b>field 2</b>: category of <i>afield</i> from <i>ainput</i>
<li><b>field 3</b>: category of <i>bfield</i> from <i>binput</i>
</ul>
<h2>NOTES</h2>
Currently only areas are supported! See also <a href="v.select.html">v.select</a>.
<p>
Attributes of the tables from ainput and binput are joined into a new table
linked to the output map.
<p>
<b>v.db.connect map=</b><em>outputmap</em> <b>table=</b><em>ainput.dbf</em>
<b>field=</b>2<br>
<b>v.db.connect map=</b><em>outputmap</em> <b>table=</b><em>binput.dbf</em>
<b>field=</b>3<br>
<p>
<b>Attention:</b> Removing the output map will also delete all tables linked to
it! Therefore it is advisable to copy tables from ainput and binput first and
connect the copied tables to the output map.
<h2>EXAMPLE</h2>
<b>v.overlay ainput=</b><em>lake</em> <b>binput=</b><em>province</em> <b>output=</b><em>lakeXprovince</em>
<h2>SEE ALSO</h2>
<em>
<a href="v.db.connect.html">v.db.connect</a>,
<a href="v.select.html">v.select</a>,
<a href="g.copy.html">g.copy</a></em>
<h2>AUTHORS</h2>
Radim Blazek, ITC-Irst, Trento, Italy
<p><i>Last changed: $Date: 2004/12/10 09:54:32 $</i>
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