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 [arc_layer=string] [node_layer=string] [arc_column=name] [arc_backward_column=name] [node_column=string] method=string [--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
- output=name [required]
- Name for output vector map
- 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)
- node_column=string
- Node cost column (number)
- method=string [required]
- Feature type
- Options: bridge, articulation
- bridge: Finds bridges
- articulation: Finds articulation points
v.net.bridge finds bridges and articulation points in a network.
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 GIS, 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.
v.net,
v.category
Daniel Bundala, Google Summer of Code 2009, Student
Wolf Bergenheim, Mentor
SOURCE CODE
Available at:
v.net.bridge source code
(history)
Latest change: Friday Oct 25 16:16:09 2024 in commit: 4ea983fff87951516b6e4578a0527e3b10f04643
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual