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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