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 [
layer=
integer]
output=
name [
ncolumn=
name]
[
set1_layer=
integer] [
set1_cats=
range]
[
set1_where=
sql_query] [
set2_layer=
integer]
[
set2_cats=
range] [
set2_where=
sql_query]
[--
overwrite] [--
verbose] [--
quiet]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- input=name
-
Name of input vector map
- layer=integer
-
Layer number
A single vector map can be connected to multiple database tables. This
number determines which table to use.
Default: 1
- output=name
-
Name for output vector map
- ncolumn=name
-
Name of node capacity column
- set1_layer=integer
-
Set1 layer number or name
A single vector map can be connected to multiple database tables. This
number determines which table to use.
Default: 1
- 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 = 10000
- set2_layer=integer
-
Layer number
Set2 layer number or name
Default: 1
- set2_cats=range
-
Category values
Set2 category values
- set2_where=sql_query
-
Set2 WHERE conditions of SQL statement without 'where' keyword
Example: income = 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
ncolumn 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"
ncolumn=capacity
SEE ALSO¶
v.net.flow, v.net.bridge
AUTHORS¶
Daniel Bundala, Google Summer of Code 2009, Student
Wolf Bergenheim, Mentor
Last changed: $Date: 2011-11-08 11:06:56 +0100 (Tue, 08 Nov 2011) $
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