GRASS GIS manual: v.net.bridge

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 layer=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: Name of input vector map; Data source for direct OGR access
output=name: Name for output vector map
layer=string: Layer number or name; A single vector map can be connected to multiple database tables. This number determines which table to use. Layer name for direct OGR access.; Default: 1
method=string: 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. If method=bridge then lines corresponding to bridges are copied from the input map to the output map. On the other hand, if method=articulation then point are created on the positions of articulation points.

In GRASS, line is not always a single line segments. 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

AUTHORS

Daniel Bundala, Google Summer of Code 2009, Student
Wolf Bergenheim, Mentor

Last changed: $Date: 2010-04-10 10:01:48 -0700 (Sat, 10 Apr 2010) $

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