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<h2>NAME</h2>
<em><b>v.net.connectivity</b></em> - Computes vertex connectivity between two sets of nodes in the network.
<h2>KEYWORDS</h2>
vector, network, connectivity
<h2>SYNOPSIS</h2>
<b>v.net.connectivity</b><br>
<b>v.net.connectivity help</b><br>
<b>v.net.connectivity</b> <b>input</b>=<em>name</em> [<b>layer</b>=<em>integer</em>] <b>output</b>=<em>name</em> [<b>ncolumn</b>=<em>name</em>] [<b>set1_layer</b>=<em>integer</em>] [<b>set1_cats</b>=<em>range</em>] [<b>set1_where</b>=<em>sql_query</em>] [<b>set2_layer</b>=<em>integer</em>] [<b>set2_cats</b>=<em>range</em>] [<b>set2_where</b>=<em>sql_query</em>] [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>--overwrite</b></DT>
<DD>Allow output files to overwrite existing files</DD>
<DT><b>--verbose</b></DT>
<DD>Verbose module output</DD>
<DT><b>--quiet</b></DT>
<DD>Quiet module output</DD>
</DL>
<h3>Parameters:</h3>
<DL>
<DT><b>input</b>=<em>name</em></DT>
<DD>Name of input vector map</DD>
<DT><b>layer</b>=<em>integer</em></DT>
<DD>Layer number</DD>
<DD>A single vector map can be connected to multiple database tables. This number determines which table to use.</DD>
<DD>Default: <em>1</em></DD>
<DT><b>output</b>=<em>name</em></DT>
<DD>Name for output vector map</DD>
<DT><b>ncolumn</b>=<em>name</em></DT>
<DD>Name of node capacity column</DD>
<DT><b>set1_layer</b>=<em>integer</em></DT>
<DD>Set1 layer number or name</DD>
<DD>A single vector map can be connected to multiple database tables. This number determines which table to use.</DD>
<DD>Default: <em>1</em></DD>
<DT><b>set1_cats</b>=<em>range</em></DT>
<DD>Set1 category values</DD>
<DD>Example: 1,3,7-9,13</DD>
<DT><b>set1_where</b>=<em>sql_query</em></DT>
<DD>Set1 WHERE conditions of SQL statement without 'where' keyword</DD>
<DD>Example: income < 1000 and inhab >= 10000</DD>
<DT><b>set2_layer</b>=<em>integer</em></DT>
<DD>Layer number</DD>
<DD>Set2 layer number or name</DD>
<DD>Default: <em>1</em></DD>
<DT><b>set2_cats</b>=<em>range</em></DT>
<DD>Category values</DD>
<DD>Set2 category values</DD>
<DT><b>set2_where</b>=<em>sql_query</em></DT>
<DD>Set2 WHERE conditions of SQL statement without 'where' keyword</DD>
<DD>Example: income < 1000 and inhab >= 10000</DD>
</DL>
<h2>DESCRIPTION</h2>
<em>v.net.connectivity</em> computes vertex connectivity between two sets,
i.e. the minimum number of vertices whose removal would separate two
given sets.
<h2>NOTES</h2>
Two sets (<em>set1</em> and <em>set2</em>) are specified by respective
<b>layer</b>, <b>where</b> and <b>cats</b> parameters. Similarly to
<a href="v.net.flow.html">v.net.flow</a> module, capacities of nodes can
be given by <b>ncolumn</b> option. <em>v.net.connectivity</em> finds the
set of nodes of minimum total capacitiy separating the two given sets and
outputs map containing points on the positions of these nodes. Default
capacity, which is used when no column is specified, is one.
<h2>EXAMPLES</h2>
The following command finds the minimum number of intersections separating
roads on the left bank from roads on the right bank.
<div class="code"><pre>
v.net.connectivity input=roads output=roads_conn set1_where="bank=left" \
set2_where="bank=right"
</pre></div>
<p>
<div class="code"><pre>
v.net.connectivity input=airtraffic output=connectivity \
set1_where="name=JFK" set2_where="name=Heathrow" ncolumn=capacity
</pre></div>
<h2>SEE ALSO</h2>
<em>
<a href="v.net.html">v.net</a>,
<a href="v.net.flow.html">v.net.flow</a>,
<a href="v.net.bridge.html">v.net.bridge</a>
</em>
<h2>AUTHORS</h2>
Daniel Bundala, Google Summer of Code 2009, Student<br>
Wolf Bergenheim, Mentor
<p>
<i>Last changed: $Date: 2013-05-23 13:01:55 -0700 (Thu, 23 May 2013) $</i>
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