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v.net

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v.net: Performs network maintenance.

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=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 A single vector map can be connected to multiple database tables. This number determines which table to use. Default: 1 nlayer=integer Node layer 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 14:42:56 +0100 (Mon, 17 Dec 2007) $ Full index (C) 2003-2010 GRASS Development Team V.NET(1)
 
 
 

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