v.net.componentsgrass - Online in the Cloud

PROGRAM:

NAME

v.net.components - Computes strongly and weakly connected components in the network.

KEYWORDS

vector, network, components

SYNOPSIS

v.net.components
v.net.components --help
v.net.components [-a] input=name [arc_layer=string] [node_layer=string]
[arc_column=name] [arc_backward_column=name] [node_column=string] output=name
method=string [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:
-a
Add points on nodes

--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

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)

output=name [required]
Name for output vector map

method=string [required]
Type of components
Options: weak, strong
weak: Weakly connected components
strong: Strongly connected components

DESCRIPTION

v.net.components computes the weakly and strongly connected components in a network.

NOTES

Two nodes, u and v are in the same strongly connected component if there are directed
paths from u to v and from v to u. The nodes are in the same weakly connected component
if, ignoring orientation of the edges, there is a path between them.
The type of components is specified by method parameter. v.net.components creates a table
and links it to the given layer. This table contains only two integer columns: cat and
comp . If a point or both endpoints of a line belong to the same component then the
point/line is written to the output map and appropriate information is stored in the
table. If -a flag is set then new points are added on the nodes without points. These
points have category numbers larger than any category used in the input map.

EXAMPLES

Any road network should form a single strongly connected component. Otherwise, it is
impossible to travel between some places.
v.net.components input=roads output=roads_components method=strong

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