NAME
v.net.spanningtree - Computes minimum spanning tree for the network.
KEYWORDS
vector,
network,
spanning tree
SYNOPSIS
v.net.spanningtree
v.net.spanningtree --help
v.net.spanningtree [-g] input=name output=name [arc_layer=string] [node_layer=string] [arc_column=name] [node_column=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -g
- Use geodesic calculation for longitude-latitude locations
- --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)
- node_column=name
- Node cost column (number)
v.net.spanningtree finds the minimum spanning tree in a
network.
A spanning tree is a minimum cost subnetwork connecting all nodes in a
network. Or, if a network is disconnected then the module computes
the minimum spanning tree for each (weakly) connected component. So,
strictly speaking,
v.net.spanningtree does not compute spanning tree
but a spanning forest. As the name suggests, a spanning tree is a tree. That
is, it contains no cycles and if a component has N nodes then the
tree has N-1 edges connecting all nodes.
Accol is used to
specify the costs of the edges. The
output consists of the
edges in the spanning tree.
Find cheapest set of pipelines connecting all nodes.
v.net.spanningtree input=projected_pipelines output=spanningtree accol=cost
v.net,
v.net.steiner
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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GRASS Development Team,
GRASS GIS 7.0.3 Reference Manual