[GRASS-SVN] r49138 - grass/branches/releasebranch_6_4/vector/v.buffer

[svn_grass at osgeo.org]

Author: neteler
Date: 2011-11-08 02:09:10 -0800 (Tue, 08 Nov 2011)
New Revision: 49138

Modified:
   grass/branches/releasebranch_6_4/vector/v.buffer/description.html
Log:
some help snippet backported

Modified: grass/branches/releasebranch_6_4/vector/v.buffer/description.html
===================================================================
--- grass/branches/releasebranch_6_4/vector/v.buffer/description.html	2011-11-08 10:06:56 UTC (rev 49137)
+++ grass/branches/releasebranch_6_4/vector/v.buffer/description.html	2011-11-08 10:09:10 UTC (rev 49138)
@@ -9,6 +9,13 @@
 
 Attributes are not transferred due to potential buffer overlap, which
 cannot be resolved automatically.
+<p>
+The input vector must be reasonably clean: lines must not intersect
+themselves. It is recommended to clean the input vector first with
+<em>v.clean tool=snap,break,rmdupl</em> and then create buffers. The 
+snapping threshold depends on the digitization threshold and the desired 
+buffering distance. As a rule of thumb, the snapping distance can be 
+up to 1% of the buffering distance.
 
 <h2>EXAMPLES</h2>