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Man Pages
v.net.bridge(1) Grass User's Manual v.net.bridge(1)

v.net.bridge - Computes bridges and articulation points in the network.

vector, network, articulation points

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]

--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
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.

	TBD

v.net, v.category,

Daniel Bundala, Google Summer of Code 2009, Student
 
Wolf Bergenheim, Mentor
Last changed: $Date: 2013-05-23 21:59:24 +0200 (Thu, 23 May 2013) $

Available at: v.net.bridge source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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