[GRASS-SVN] r41927 - grass/trunk/lib/vector

[svn_grass at osgeo.org]

Author: martinl
Date: 2010-04-19 14:18:03 -0400 (Mon, 19 Apr 2010)
New Revision: 41927

Modified:
   grass/trunk/lib/vector/vectorlib.dox
Log:
some notes about pseudo-topology (based on Markus Metz's notes in ML)


Modified: grass/trunk/lib/vector/vectorlib.dox
===================================================================
--- grass/trunk/lib/vector/vectorlib.dox	2010-04-19 17:23:46 UTC (rev 41926)
+++ grass/trunk/lib/vector/vectorlib.dox	2010-04-19 18:18:03 UTC (rev 41927)
@@ -1433,6 +1433,15 @@
 
 \section vlibOgrIface OGR interface
 
+\subsection vLibPseudoTopo Pseudo-topology
+
+Reduced topology: each boundary is attached to one area only,
+i.e. smoothing, simplification, removing small areas etc. will not
+work properly for adjacent areas or areas within areas.
+
+Full topology is only available for native GRASS vectors or can only
+be built after all polygons are cleaned as done by <tt>v.in.ogr</tt>.
+
 \subsection vlibFrmtFileFormat Frmt file format specification
 
 Frmt is a plain text file which contains basic information about