NAME¶
v.lrs.segment - Creates points/segments from input lines, linear
reference system and positions read from stdin or a file.
KEYWORDS¶
vector, LRS, networking
SYNOPSIS¶
v.lrs.segment
v.lrs.segment help
v.lrs.segment input=
name output=
name
[
llayer=
integer] [
rsdriver=
string]
[
rsdatabase=
string]
rstable=
string
[
file=
name] [--
overwrite] [--
verbose]
[--
quiet]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- input=name
-
Input vector map containing lines
- output=name
-
Output vector map where segments will be written
- llayer=integer
-
Layer number
Line layer
Default: 1
- rsdriver=string
-
Driver name for reference system table
Default: dbf
- rsdatabase=string
-
Database name for reference system table
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/
- rstable=string
-
Name of the reference system table
- file=name
-
Name of file containing segment rules. If not given, read from stdin.
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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