.TH v.net.connectivity 1grass "" "GRASS 6.4.4" "Grass User's Manual"
.SH NAME
\fI\fBv.net.connectivity\fR\fR  - Computes vertex connectivity between two sets of nodes in the network.
.SH KEYWORDS
vector, network, connectivity
.SH SYNOPSIS
\fBv.net.connectivity\fR
.br
\fBv.net.connectivity help\fR
.br
\fBv.net.connectivity input\fR=\fIname\fR  [\fBlayer\fR=\fIinteger\fR]  \fBoutput\fR=\fIname\fR  [\fBncolumn\fR=\fIname\fR]   [\fBset1_layer\fR=\fIinteger\fR]   [\fBset1_cats\fR=\fIrange\fR]   [\fBset1_where\fR=\fIsql_query\fR]   [\fBset2_layer\fR=\fIinteger\fR]   [\fBset2_cats\fR=\fIrange\fR]   [\fBset2_where\fR=\fIsql_query\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR] 
.SS Flags:
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR" 4m
.br
Name of input vector map
.IP "\fBlayer\fR=\fIinteger\fR" 4m
.br
Layer number
.br
A single vector map can be connected to multiple database tables. This number determines which table to use.
.br
Default: \fI1\fR
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output vector map
.IP "\fBncolumn\fR=\fIname\fR" 4m
.br
Name of node capacity column
.IP "\fBset1_layer\fR=\fIinteger\fR" 4m
.br
Set1 layer number or name
.br
A single vector map can be connected to multiple database tables. This number determines which table to use.
.br
Default: \fI1\fR
.IP "\fBset1_cats\fR=\fIrange\fR" 4m
.br
Set1 category values
.br
Example: 1,3,7-9,13
.IP "\fBset1_where\fR=\fIsql_query\fR" 4m
.br
Set1 WHERE conditions of SQL statement without 'where' keyword
.br
Example: income = 10000
.IP "\fBset2_layer\fR=\fIinteger\fR" 4m
.br
Layer number
.br
Set2 layer number or name
.br
Default: \fI1\fR
.IP "\fBset2_cats\fR=\fIrange\fR" 4m
.br
Category values
.br
Set2 category values
.IP "\fBset2_where\fR=\fIsql_query\fR" 4m
.br
Set2 WHERE conditions of SQL statement without 'where' keyword
.br
Example: income = 10000
.PP
.SH DESCRIPTION
\fIv.net.connectivity\fR computes vertex connectivity between two sets,
i.e. the minimum number of vertices whose removal would separate two 
given sets. 
.SH NOTES
Two sets (\fIset1\fR and \fIset2\fR) are specified by respective
\fBlayer\fR, \fBwhere\fR and \fBcats\fR parameters. Similarly to
v.net.flow module, capacities of nodes can
be given by \fBncolumn\fR option. \fIv.net.connectivity\fR 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.
.SH EXAMPLES
The following command finds the minimum number of intersections separating
roads on the left bank from roads on the right bank. 
\fC
.DS
.br
v.net.connectivity input=roads output=roads_conn set1_where="bank=left" \(rs
.br
      set2_where="bank=right"
.br
.DE
\fR
.PP
\fC
.DS
.br
v.net.connectivity input=airtraffic output=connectivity \(rs
.br
      set1_where="name=JFK" set2_where="name=Heathrow" ncolumn=capacity
.br
.DE
\fR
.SH SEE ALSO
\fI
v.net,
v.net.flow,
v.net.bridge
\fR
.SH AUTHORS
Daniel Bundala, Google Summer of Code 2009, Student
.br
Wolf Bergenheim, Mentor
.PP
\fILast changed: $Date: 2013-05-23 22:01:55 +0200 (Thu, 23 May 2013) $\fR
.PP
Full index
.PP
© 2003-2014 GRASS Development Team