On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan <stefan.zieg...@bd.so.ch> wrote: > Hi Giuseppe > > thanks for looking into this. Do you think it's worth filling out a bug > report since the nearestNeighbor method does not the keep the promise or is > this the normal behaviour of a spatial index based method?
Spatial index uses only the bounding boxes of geometries for two reasons: most importantly the intersection test (used when traversing the data structure) is much faster when compared to testing intersection of real geometry. Second, this would require spatial index to store all geometries - this memory overhead can be significant for bigger layers. So as David already suggested, to ensure you are really working with the nearest geometry, you should check the real distance. Regards Martin _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
