<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>GRASS GIS: v.lrs.segment</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" href="grassdocs.css" type="text/css"> </head> <body bgcolor="white"> <img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade> <h2>NAME</h2> <em><b>v.lrs.segment</b></em> - Creates points/segments from input lines, linear reference system and positions read from stdin or a file. <h2>KEYWORDS</h2> vector, LRS, networking <h2>SYNOPSIS</h2> <b>v.lrs.segment</b><br> <b>v.lrs.segment help</b><br> <b>v.lrs.segment</b> <b>input</b>=<em>name</em> <b>output</b>=<em>name</em> [<b>llayer</b>=<em>integer</em>] [<b>rsdriver</b>=<em>string</em>] [<b>rsdatabase</b>=<em>string</em>] <b>rstable</b>=<em>string</em> [<b>file</b>=<em>name</em>] [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>] <h3>Flags:</h3> <DL> <DT><b>--overwrite</b></DT> <DD>Allow output files to overwrite existing files</DD> <DT><b>--verbose</b></DT> <DD>Verbose module output</DD> <DT><b>--quiet</b></DT> <DD>Quiet module output</DD> </DL> <h3>Parameters:</h3> <DL> <DT><b>input</b>=<em>name</em></DT> <DD>Input vector map containing lines</DD> <DT><b>output</b>=<em>name</em></DT> <DD>Output vector map where segments will be written</DD> <DT><b>llayer</b>=<em>integer</em></DT> <DD>Layer number</DD> <DD>Line layer</DD> <DD>Default: <em>1</em></DD> <DT><b>rsdriver</b>=<em>string</em></DT> <DD>Driver name for reference system table</DD> <DD>Default: <em>dbf</em></DD> <DT><b>rsdatabase</b>=<em>string</em></DT> <DD>Database name for reference system table</DD> <DD>Default: <em>$GISDBASE/$LOCATION_NAME/$MAPSET/dbf/</em></DD> <DT><b>rstable</b>=<em>string</em></DT> <DD>Name of the reference system table</DD> <DT><b>file</b>=<em>name</em></DT> <DD>Name of file containing segment rules. If not given, read from stdin.</DD> </DL> <h2>DESCRIPTION</h2> <em>v.lrs.segment</em> creates points/segments from input lines, linear reference system and positions read from <tt>standard in</tt> or a file. <P> The format is as follows:<BR> <div class="code"><pre> P <point_id> <line_id> <milepost>+<offset> [<side offset>] L <segment_id> <line_id> <milepost>+<offset> <milepost>+<offset> [<side offset>] </pre></div> <h2>NOTES</h2> For more information and examples see the help page for <em>v.lrs.segment</em>'s sister module, <em><a href="v.segment.html">v.segment</a></em>. <h2>EXAMPLE</h2> This example is written for the Spearfish dataset (it continues the example from <em>v.lrs.create</em>). <p> In this example, the 'route_lrs' shall be extended for a new position (point) along the LRS after bus stop 4: <div class="code"><pre> # 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 </pre></div> <h2>TODO</h2> Figure out how to merge result into existing LRS map and table. <h2>SEE ALSO</h2> <em> <a HREF="lrs.html">LRS tutorial</a>,<br> <a HREF="http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=50">Introducing the Linear Reference System in GRASS</a>,<br> <a HREF="v.lrs.create.html">v.lrs.create</a>, <a HREF="v.lrs.where.html">v.lrs.where</a>, <a HREF="v.lrs.label.html">v.lrs.label</a>, <a HREF="v.segment.html">v.segment</a> </em> <h2>AUTHOR</h2> Radim Blazek <p> <i>Last changed: $Date: 2007-07-05 16:05:39 +0200 (Thu, 05 Jul 2007) $</i> <HR> <P><a href="index.html">Main index</a> - <a href="vector.html">vector index</a> - <a href="full_index.html">Full index</a></P> <P>© 2003-2008 <a href="http://grass.osgeo.org">GRASS Development Team</a></p> </body> </html>
