NAME
v.lrs.segment - Creates points/segments from input lines, linear reference system and positions read from stdin or a file.
KEYWORDS
vector,
linear reference system,
network
SYNOPSIS
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]
Flags:
- --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
Parameters:
- 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, odbc, 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.
v.lrs.create,
v.lrs.where,
v.lrs.label,
v.segment
LRS tutorial,
Introducing the Linear Reference System in GRASS
Radim Blazek
SOURCE CODE
Available at:
v.lrs.segment source code
(history)
Latest change: Thursday Feb 03 11:10:06 2022 in commit: 547ff44e6aecfb4c9cbf6a4717fc14e521bec0be
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© 2003-2023
GRASS Development Team,
GRASS GIS 8.2.2dev Reference Manual