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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] 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.
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) $
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