Rechercher une page de manuel
v.net
Langue: en
Version: 372219 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
v.net - Network maintenance.KEYWORDS
vector, networkingSYNOPSIS
v.netv.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, rs
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.salesmanAUTHORS
Radim Blazek, ITC-Irst, Trento, ItalyMartin Landa, FBK-Irst, Trento, Italy
Last changed: $Date: 2007-12-17 14:45:01 +0100 (Mon, 17 Dec 2007) $
Full index
© 2003-2008 GRASS Development Team
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre