v.lrs.segment1grass

Usage

Keywords

vector, linear reference system, network

Overview

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.

Examples

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 vector=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 table=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.

Source code

Available at: v.lrs.segment source code (history)

Accessed: Monday Feb 24 17:51:17 2025

Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual