[QGIS-trac] Re: [Quantum GIS] #2921: Avoid intersection of new polygons.. IS BROKEN

[Quantum GIS]

#2921: Avoid intersection of new polygons.. IS BROKEN
---------------------------------------------------------+------------------
   Reporter:  pinux                                      |              Owner:  nobody       
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.6.0
  Component:  Digitising                                 |            Version:  1.5.0        
   Keywords:  intersection, polygons                     |   Platform_version:               
   Platform:  Windows                                    |           Must_fix:  Yes          
Status_info:  0                                          |  
---------------------------------------------------------+------------------

Comment(by mhugent):

 I cannot entirely follow your description. Do you mean that the merge tool
 and avoid intersection tools don't work with invalid geometries? And after
 you fixed the geometry errors on the polygons, it did work?
 If yes, that's the behaviour I would expect. Because merge and avoid
 intersection use geos and I'm pretty sure it does not do union or
 difference on invalid geometries. Maybe postgis tests the geometries first
 and tries to fix them automatically?

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/2921#comment:1>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats