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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

       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.

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: 2015-12-17 15:38:13 +0100 (Thu, 17 Dec 2015) $

SOURCE CODE

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

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.1 Reference Manual