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v.lrs.segment(1) Grass User's Manual v.lrs.segment(1)

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

vector, linear reference system, network

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

--overwrite
 
Allow output files to overwrite existing files
--help
 
Print usage summary
--verbose
 
Verbose module output
--quiet
 
Quiet module output
--ui
 
Force launching GUI dialog

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

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>]

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

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

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

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

Radim Blazek
Last changed: $Date: 2015-12-17 15:38:13 +0100 (Thu, 17 Dec 2015) $

Available at: v.lrs.segment source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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