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Langue: en

Version: 335331 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME - Performs network maintenance.


vector, networking

SYNOPSIS help [-c] input=name [points=name] [output=name] [operation=string] [alayer=integer] [nlayer=integer] [thresh=float] [--overwrite] [--verbose] [--quiet]



Assign unique categories to new points
For operation 'nodes'

Allow output files to overwrite existing files

Verbose module output

Quiet module output



Name of input vector map

Name of input point vector map
Required for operation 'connect'

Name for output vector map

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...]}

Arc layer
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 1

Node layer
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 2

Required for operation 'connect'. Connect points in given threshold.

DESCRIPTION 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.


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.


Spearfish based examples:

Create nodes globally for all line ends and intersections: 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" | 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) myroads points=startend out=myroads_net op=connect thresh=200


v.digit, v.edit,,,,


Radim Blazek, ITC-Irst, Trento, Italy
Martin Landa, FBK-Irst, Trento, Italy

Last changed: $Date: 2007-12-17 14:42:56 +0100 (lun, 17 dic 2007) $

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