NAME
v.net.bridge - Computes bridges and articulation points in the network.
KEYWORDS
vector, network, articulation points
SYNOPSIS
v.net.bridge
v.net.bridge help
v.net.bridge input=name output=name alayer=string nlayer=string [afcolumn=name] [abcolumn=name] [ncolumn=string] method=string [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- input=name [required]
- Name of input vector map
- Or data source for direct OGR access
- output=name [required]
- Name for output vector map
- alayer=string [required]
- Layer number or name
- Arc layer
- Default: 1
- nlayer=string [required]
- Layer number or name
- Node layer
- Default: 2
- afcolumn=name
- Arc forward/both direction(s) cost column (number)
- abcolumn=name
- Arc backward direction cost column (number)
- ncolumn=string
- Node cost column (number)
- method=string [required]
- Feature type
- Options: bridge, articulation
- bridge: Finds bridges
- articulation: Finds articulation points
DESCRIPTION
v.net.bridge finds bridges and articulation points in a network.
NOTES
Bridge in a network is an edge/line whose removal would disconnect the
(sub-)network. A node is an articulation point if its removal would
disconnect the (sub-)network. For more information and formal definitions
check the wikipedia entries:
bridge
and articulation point.
The output of the module contains the selected features. For
method=bridge, lines corresponding to bridges are copied from
the input map to the output map. On the other hand, for
method=articulation, points are created on the positions of
articulation points.
In GRASS, line is not always a single line segment. It
might be, and often is, a sequence of line segments between two
intersections. Also, articulation point is a standard graph theoretic
terminology which is slightly misleading in GRASS. An articulation point
in graph theory is an articulation node in GRASS terminology.
EXAMPLES
SEE ALSO
v.category,
AUTHORS
Daniel Bundala, Google Summer of Code 2009, Student
Wolf Bergenheim, Mentor
Last changed: $Date: 2011-11-08 13:24:20 -0800 (Tue, 08 Nov 2011) $
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