Luigi Ponti wrote: > Maciej Sieczka wrote: >> Luigi Ponti wrote: >>> (in principle this seems possible: outer Voronoi cells just get >>> bigger)?
>> I don't exactly understand what you mean. Could you elaborate >> please? > What I meant is that the outer Voronoi cells may extend up to the > region's bounding box, with consequent new Voronoi cells for > interpolation points outside the convex hull, please see > http://quartese.googlepages.com/voronoi nnbathy performs Delaunay triangulation, not Voronoi tesselation. I (darkly) understand there is a mathematical relation between the two, but I don't see how it could apply in your example. If this is just my ignorance please explain more. Anyway - what could be done to overcome the trimming to convex hull effect: you need to make sure that the convex hull for your input cells covers your whole area of interest - ie. enlarge region enough for important input cells not to be omitted. If cells in the input raster are distributed so that a convex hull covering the whole area of interest is not possible, you need to enhance your input raster. r.to.vect -z feature=point followed by v.hull might be faster for testing than trial and error with r.surf.nnabthy itself. Cheers, Maciek _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
