Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

GRASS logo

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_column=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=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

Table of contents

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

EXAMPLES

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

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)

Latest change: Monday Nov 18 20:15:32 2019 in commit: 1a1d107e4f6e1b846f9841c2c6fabf015c5f720d

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

© 2003-2023 GRASS Development Team, GRASS GIS 7.8.9dev Reference Manual