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v.net.connectivity(1) Grass User's Manual v.net.connectivity(1)

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

vector, network, connectivity

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_column=name] [set1_cats=range] [set1_where=sql_query] [set2_cats= range] [set2_where=sql_query] [--overwrite] [-- help] [--verbose] [--quiet] [--ui]

--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

input=name [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 access 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 access 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=name [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

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

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 outputs map containing points on the positions of these nodes. Default capacity, which is used when no column is specified, is one.

The following command finds the minimum number of intersections separating 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

v.net, v.net.flow, v.net.bridge

Daniel Bundala, Google Summer of Code 2009, Student
 
Wolf Bergenheim, Mentor
Last changed: $Date: 2014-12-24 14:28:25 +0100 (Wed, 24 Dec 2014) $

Available at: v.net.connectivity source code (history)
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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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