I thought I understood how the GRASS v.clean tool worked in QGIS (in 2.6.1 Brighton) but I keep getting unexpected results and errors with a polygon ShapeFile. I've run the QGIS TopologyChecker with the following rules over the file:
- layer must not overlap
- layer must not have gaps
- layer must not have duplicates
- layer must not contain invalid geometries
747 errors were found, all of the gap and overlap type. I tried using the v.clean snap tool to eliminate the overlaps but this happened:
Can anyone point me in the right direction and/or point out what I'm doing wrong? The v.clean tool appears to be removing vertices and actually creating errors. All I want is the slivers in between polygons removed and the polygon holes filled in.
In the end I need a topological ShapeFile to generalize. I've found what I need for generalization here: Generalizing polygon file while maintaining topology in QGIS?