## NAME

v.lrs.segment

## 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.

## SEE ALSO

LRS tutorial,
Introducing the Linear Reference System in GRASS,
v.lrs.create, v.lrs.where, v.lrs.label, v.segment

## AUTHOR

Radim Blazek

Last changed: $Date: 2007-07-05 16:05:39 +0200 (Thu, 05 Jul 2007) $

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