[GRASS-SVN] r49558 - grass/trunk/vector/v.in.ogr

svn_grass at osgeo.org svn_grass at osgeo.org
Mon Dec 5 11:32:54 EST 2011

Author: mmetz
Date: 2011-12-05 08:32:53 -0800 (Mon, 05 Dec 2011)
New Revision: 49558

v.in.ogr manual: importing overlapping polygons

Modified: grass/trunk/vector/v.in.ogr/v.in.ogr.html
--- grass/trunk/vector/v.in.ogr/v.in.ogr.html	2011-12-05 16:24:38 UTC (rev 49557)
+++ grass/trunk/vector/v.in.ogr/v.in.ogr.html	2011-12-05 16:32:53 UTC (rev 49558)
@@ -32,6 +32,17 @@
 installation (OGR library), for details see
 <a href="http://www.gdal.org/ogr/ogr_formats.html">OGR web site</a>.
+<h3>Overlapping polygons</h3>
+When importing overlapping polygons, the overlapping parts will become 
+new areas with multiple categories, one unique category for each original 
+polygon. An original polygon will thus be converted to multiple areas 
+with the same shared category. These multiple areas will therefore also 
+link to the same entry in the attribute table. A single category value 
+may thus refer to multiple non-overlapping areas which together represent 
+the original polygon overlapping with another polygon. The original 
+polygon can be recovered by using <em>v.extract</em> with the desired 
+category value or <em>where</em> statement and the <em>-d</em> flag to 
+dissolve common boundaries.
 <h2>Location Creation</h2>
@@ -207,6 +218,7 @@
 <a href="db.connect.html">db.connect</a>,
 <a href="v.clean.html">v.clean</a>,
+<a href="v.extract.html">v.extract</a>,
 <a href="v.build.polylines.html">v.build.polylines</a>,
 <a href="v.edit.html">v.edit</a>,
 <a href="v.external.html">v.external</a>,

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