v.lrs.segment - GRASS GIS manual

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, mysql, 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.

DESCRIPTION
NOTES
EXAMPLE
TODO
SEE ALSO
AUTHOR

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 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.

AUTHOR

Radim Blazek

SOURCE CODE

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

Accessed: Sunday Jan 22 07:37:04 2023