NAME
v.net - Performs network maintenance.
KEYWORDS
vector, networking
SYNOPSIS
v.net
v.net help
v.net [-c] [input=name] [points=name] [output=name] operation=string alayer=string nlayer=string [thresh=float] [file=name] [--overwrite] [--verbose] [--quiet]
Flags:
- -c
- Assign unique categories to new points
- For operation 'nodes'
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- input=name
- Name of input vector line map (arcs)
- Required for operation 'nodes', 'connect', 'report' and 'nreport'
- points=name
- Name of input vector point map (nodes)
- Required for operation 'connect' and 'arcs'
- output=name
- Name for output vector map
- operation=string
- Operation to be performed
- Options: nodes,connect,arcs,report,nreport
- nodes: new point is placed on each node (line end) if doesn't exist
- connect: connect still unconnected points to vector network by inserting new line(s)
- arcs: new line is created from start point to end point
- report: print to standard output {line_category start_point_category end_point_category}
- nreport: print to standard output {point_category line_category[,line_category...]}
- alayer=string
- Arc layer
- 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
- nlayer=string
- Node layer
- 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: 2
- thresh=float
- Threshold
- Required for operation 'connect'. Connect points in given threshold.
- file=name
- Name of input file
- Required for operation 'arcs'. '-' for standard input.
DESCRIPTION
v.net is used for vector network maps maintenance. It
reports the current network graph status. It also permits to globally
insert missing nodes or arcs and to connect unconnected nodes to the
graph within a given distance threshold.
NOTES
If vector editing is required to modify the
graph, wxGUI vector
digitizer or v.edit can be
used. Separately,
Linear Referencing System is available in
GRASS.
EXAMPLES
NC dataset based examples.
Create nodes globally for all line ends and intersections:
v.net input=streams output=streams_node operation=nodes
v.net input=streams points=firestations out=streems_net operation=connect thresh=500
[category of edge] [category of start node] [category of end node]
v.net points=geodetic_swwake_pts output=geodetic_swwake_pts_net operation=arcs file=- << EOF
> 1 28000 28005
> 2 27945 27958
> 3 27886 27897
> EOF
SEE ALSO
wxGUI vector digitizer,
v.edit
v.net.iso,
v.net.path,
v.net.steiner,
v.net.salesman
AUTHORS
Radim Blazek, ITC-irst, Trento, Italy
Martin Landa, FBK-irst (formerly ITC-irst), Trento, Italy and CTU in
Prague, Czech Republic (operation 'connect' and 'arcs')
Last changed: $Date: 2009-01-19 14:31:57 -0800 (Mon, 19 Jan 2009) $
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