[Qgis-developer] Dissolve/merge features and Validate geometries GEOS

[Lene Fischer]

Hi,



Having a problem dissolving two large multi polygons – one of my students asked why I suggest ‘dissolve’ – when ‘merge selected features’ was so much faster. Dissolve takes ages.



After consulting a master on this issue (Nyall ☺) he suggested that I change the settings -> Options -> Digitizing -> and change "Validate geometries" from QGIS to "GEOS".



Now the dissolve runs smooth and fast



I don´t have a clue about this topic – But my question is: Why is this not standard ?



Regards


Lene Fischer
Associate Professor

University of Copenhagen
Department of Geoscience and Natural Resource Management
Forest and Landscape College
Nødebovej 77a
3480 Fredensborg
Denmark

MOB +45 004540115084
lfi at ign.ku.dk<mailto:lfi at ign.ku.dk>


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