GRASS GIS manual: v.lrs.segment

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NAME

v.lrs.segment - Creates points/segments from input lines, linear reference system and positions read from stdin or a file.

KEYWORDS

vector, LRS, networking

SYNOPSIS

v.lrs.segment
v.lrs.segment help
v.lrs.segment input=name output=name [llayer=integer] [rsdriver=string] [rsdatabase=string] rstable=string [file=name] [--overwrite] [--verbose] [--quiet]

Flags:

--overwrite: Allow output files to overwrite existing files
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name: Input vector map containing lines
output=name: Output vector map where segments will be written
llayer=integer: Layer number; Line layer; Default: 1
rsdriver=string: Driver name for reference system table; Default: dbf
rsdatabase=string: Database name for reference system table; Default: $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/
rstable=string: Name of the reference system table
file=name: Name of file containing segment rules. If not given, read from stdin.

DESCRIPTION

v.lrs.segment creates points/segments from input lines, linear reference system and positions read from standard in or a file.

The format is as follows:

P <point_id> <line_id> <milepost>+<offset> [<side offset>]
L <segment_id> <line_id> <milepost>+<offset> <milepost>+<offset> [<side offset>]

NOTES

For more information and examples see the help page for v.lrs.segment's sister module, v.segment.

EXAMPLE

This example is written for the Spearfish dataset (it continues the example from v.lrs.create).

In this example, the 'route_lrs' shall be extended for a new position (point) along the LRS after bus stop 4:

# new point on LRS
echo "P 7 22 4+180" | v.lrs.segment route_lrs out=route_lrs_new rstable=route_lrs

g.region vect=route_lrs n=n+100 s=s-100 -p
d.erase
# existing LRS
d.vect route_lrs
d.vect busstops disp=attr attr=cat size=10 bg=white lcol=blue yref=bottom
d.vect busstops icon=basic/circle fcol=blue
db.select route_lrs

# show modified map
d.vect route_lrs_new col=red

TODO

Figure out how to merge result into existing LRS map and table.

AUTHOR

Radim Blazek

Last changed: $Date: 2007-07-05 07:05:39 -0700 (Thu, 05 Jul 2007) $

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