v.lrs.segment(1)

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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