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v.net.connectivity(1)	    GRASS GIS User's Manual	 v.net.connectivity(1)

NAME
       v.net.connectivity   - Computes vertex connectivity between two sets of
       nodes in	the network.

KEYWORDS
       vector, network,	connectivity

SYNOPSIS
       v.net.connectivity
       v.net.connectivity --help
       v.net.connectivity input=name  [arc_layer=string]   [node_layer=string]
       [arc_column=name]   [arc_backward_column=name]  output=name  [node_col-
       umn=name]	   [set1_cats=range]		[set1_where=sql_query]
       [set2_cats=range]    [set2_where=sql_query]    [--overwrite]   [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       --overwrite
	   Allow output	files to overwrite existing files

       --help
	   Print usage summary

       --verbose
	   Verbose module output

       --quiet
	   Quiet module	output

       --ui
	   Force launching GUI dialog

   Parameters:
       input=nameA [required]
	   Name	of input vector	map
	   Or data source for direct OGR access

       arc_layer=string
	   Arc layer
	   Vector features can have category values in different layers.  This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.
	   Default: 1

       node_layer=string
	   Node	layer
	   Vector features can have category values in different layers.  This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.
	   Default: 2

       arc_column=name
	   Arc forward/both direction(s) cost column (number)

       arc_backward_column=name
	   Arc backward	direction cost column (number)

       output=nameA [required]
	   Name	for output vector map

       node_column=name
	   Node	cost column (number)

       set1_cats=range
	   Set1	category values
	   Example: 1,3,7-9,13

       set1_where=sql_query
	   Set1	WHERE conditions of SQL	statement without 'where' keyword
	   Example: income < 1000 and population >= 10000

       set2_cats=range
	   Category values
	   Set2	category values

       set2_where=sql_query
	   Set2	WHERE conditions of SQL	statement without 'where' keyword
	   Example: income < 1000 and population >= 10000

DESCRIPTION
       v.net.connectivity computes vertex connectivity between two sets,  i.e.
       the  minimum  number of vertices	whose removal would separate two given
       sets.

NOTES
       Two sets	(set1 and set2)	are specified by respective layer,  where  and
       cats  parameters.  Similarly  to	v.net.flow module, capacities of nodes
       can be given by node_column option. v.net.connectivity finds the	set of
       nodes of	minimum	total capacitiy	separating the two given sets and out-
       puts map	containing points on the positions of these nodes. Default ca-
       pacity, which is	used when no column is specified, is one.

EXAMPLES
       The  following  command finds the minimum number	of intersections sepa-
       rating roads on the left	bank from roads	on the right bank.
       v.net.connectivity input=roads output=roads_conn	set1_where="bank=left" \
	     set2_where="bank=right"

       v.net.connectivity input=airtraffic output=connectivity \
	     set1_where="name=JFK" set2_where="name=Heathrow" node_column=capacity

SEE ALSO
	v.net, v.net.flow, v.net.bridge

AUTHORS
       Daniel Bundala, Google Summer of	Code 2009, Student
       Wolf Bergenheim,	Mentor

SOURCE CODE
       Available at: v.net.connectivity	source code (history)

       Main index | Vector index | Topics index	| Keywords index  |  Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.3 Reference	Manual

GRASS 7.8.3						 v.net.connectivity(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLES | SEE ALSO | AUTHORS | SOURCE CODE

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