Il 10/01/2014 15:18, Andreas Neumann ha scritto: > But I can confirm that the whole analysis chain is a bit problematic > with all these precision issues. As an example if you test intersections > of buildings against parcels (2 different layers) and the building > touches the parcel borders you may get very tiny intersects with parcels > (only a few square cms) and you wouldn't want to include these > intersections in your analysis. > > So it would be cool if for geometry tests there could be a notion of > threshold values. If the area of an intersected polygon is below this > value it wouldn't be taken into account during the analysis. > > These issues are really kind of show-stoppers and almost always require > intermediate steps to sort out these edge cases. It would be very handy > if the tools could handle this precision/uncertainty problems without > having to do a lot of intermediate steps.
Agreed, this is a good approach IMHO. Should I open a ticket? All the best. -- Paolo Cavallini - www.faunalia.eu Corsi QGIS e PostGIS: http://www.faunalia.eu/training.html _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
