
NAME
v.net - Network maintenance.
KEYWORDS
vector, networking
SYNOPSIS
v.net
v.net help
v.net [-c] input=name [points=name] [output=name] [operation=string] [alayer=integer] [nlayer=integer] [thresh=float] [--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 map
- points=name
- Name of input point vector map
- Required for operation 'connect'
- output=name
- Name for output vector map
- operation=string
- Operation to be performed
- Options: nodes,connect,report,nreport
- Default: nodes
- 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)
- 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=integer
- Arc layer (network)
- A single vector map can be connected to multiple database tables. This number determines which table to use.
- Default: 1
- nlayer=integer
- Node layer (points)
- A single vector map can be connected to multiple database tables. This number determines which table to use.
- Default: 2
- thresh=float
- Threshold
- Required for operation 'connect'. Connect points in given threshold.
DESCRIPTION
v.net is used for vector network maps maintenance.
It reports about the current network graph status.
It also permits to globally insert missing nodes and to connect
unconnected nodes to the graph within a given distance threshold.
NOTES
If vector editing is required to modify the graph, v.digit
or v.edit can be used. Separately,
Linear Referencing System is available
in GRASS.
EXAMPLES
Spearfish based examples:
Create nodes globally for all line ends and intersections:
v.net in=streams out=streams_node
Merge in nodes from a separate map within given threshold:
echo "1|601653.5|4922869.2|start
2|593330.8|4924096.6|end" | v.in.ascii cat=1 x=2 y=3 out=startend col="cat integer, \
east double precision, north double precision, label varchar(43)"
#create lines map connecting points to network (on layer 2)
v.net myroads points=startend out=myroads_net op=connect thresh=200
SEE ALSO
v.digit,
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, Trento, Italy
Last changed: $Date: 2007-12-17 05:42:56 -0800 (Mon, 17 Dec 2007) $
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