[GRASS-SVN] r58835 - grass/trunk/vector/v.lrs
svn_grass at osgeo.org
svn_grass at osgeo.org
Sat Feb 1 14:23:22 PST 2014
Author: neteler
Date: 2014-02-01 14:23:22 -0800 (Sat, 01 Feb 2014)
New Revision: 58835
Modified:
grass/trunk/vector/v.lrs/lrs.html
Log:
lrs manual: fix PDF URL to R Blazek's paper
Modified: grass/trunk/vector/v.lrs/lrs.html
===================================================================
--- grass/trunk/vector/v.lrs/lrs.html 2014-02-01 22:10:43 UTC (rev 58834)
+++ grass/trunk/vector/v.lrs/lrs.html 2014-02-01 22:23:22 UTC (rev 58835)
@@ -25,6 +25,7 @@
by a route ID and a measure. A route is a path on the network, usually
composed from more features in the input map. Events can be either
points or lines (segments).
+
<p>
LRS is created from input lines and points in vector map.
Points - MP (mileposts) must have attached attributes specifying
@@ -33,7 +34,8 @@
are specified by MP+offset.
Typically, MP is in kilometers and offset in meters.
-<p>The implementation of LRS in GRASS has some particularities.
+<p>
+The implementation of LRS in GRASS has some particularities.
<h3>Double referenced system</h3>
This feature gives a possibility to continue to use most of
@@ -96,17 +98,20 @@
</pre></div>
Because each MP can keep 2 values (start, end) it is called 'double' referenced LRS.
-<p>To avoid potential confusion, MP values are limited to integers only.
+<p>
+To avoid potential confusion, MP values are limited to integers only.
It would be ambiguous to have for example segments 3.500 - 3.500+200
and 3.600 - 3.600+200. The position 3+650 would fall into 2 segments,
correct would be 3.600+50.
That means, that MP must be the beginning of antonomous segment
and all parts which becomes longer then before must be referenced
from the last not changed MP.
-<p>The MP <em>start_mp</em> and <em>end_mp</em> columns must be decimal, but
+<p>
+The MP <em>start_mp</em> and <em>end_mp</em> columns must be decimal, but
<em>v.lrs.create</em> takes only the decimal part, and adds its value to
offset and prints a warning.
-<p>It is highly recommended to work with polylines instead of segmented vector
+<p>
+It is highly recommended to work with polylines instead of segmented vector
lines. The command <em>v.build.polylines</em> creates this map structure.
<h3>LRS table structure</h3>
@@ -150,7 +155,8 @@
In this case, the module gives error because the position
results in 2 points.
-<p>It can be also intended, for example a part of the road is shared
+<p>
+It can be also intended, for example a part of the road is shared
with another one, but MP are used only for one:
<div class="code"><pre>
+ road1/km15 + road1/km22
@@ -178,8 +184,9 @@
<h2>SEE ALSO</h2>
<em>R. Blazek, 2004, <a href="http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=50">Introducing the Linear Reference System in GRASS</a>, Bangkok, GRASS User Conf. Proc.</em><br>
-<em>R. Blazek, 2005, <a href="http://www.j-geoinfo.net/Content/fulmar05/IJG_095-100.pdf">Introducing the Linear Reference System in GRASS</a>, International Journal of Geoinformatics, Vol. 1(3), pp. 95-100</em><br>
-<p><em><a href="v.build.polylines.html">v.build.polylines</a></em>,
+<em>R. Blazek, 2005, <a href="http://creativecity.gscc.osaka-cu.ac.jp/IJG/article/download/320/321">Introducing the Linear Reference System in GRASS</a>, International Journal of Geoinformatics, Vol. 1(3), pp. 95-100</em><br>
+<p>
+<em><a href="v.build.polylines.html">v.build.polylines</a></em>,
<em><a href="v.lrs.create.html">v.lrs.create</a></em>,
<em><a href="v.lrs.segment.html">v.lrs.segment</a></em>,
<em><a href="v.lrs.where.html">v.lrs.where</a></em>,
@@ -193,6 +200,6 @@
<p><i>Last changed: $Date$</i>
<hr>
<p><a href="index.html">Main index</a> - <a href="vector.html">Vector index</a> - <a href="topics.html">Topics index</a> - <a href="keywords.html">Keywords Index</a> - <a href="full_index.html">Full index</a></p>
-<p>© 2003-2013 <a href="http://grass.osgeo.org">GRASS Development Team</a>, GRASS GIS 7.0.svn Reference Manual</p>
+<p>© 2003-2014 <a href="http://grass.osgeo.org">GRASS Development Team</a>, GRASS GIS 7.0.svn Reference Manual</p>
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