These white spots in the voronoi vector may be the cause. But i ran the voronoi module on the "archsites" vector of the Spearfish60 dataset and its runs fine. The cmd was
v.voronoi input="archsites" output="arch_voronoi" The only difference is that the region of archsites has got less points (around 25) whereas in Ind_rain_orig the total points were 93,000. Can this be an issue. Can you test the module at your end with less and huge data points and see if you also get similar results in both the cases. This would be a great help. Also, i checked and the data of rain fall on voronoi vector is NOT NULL on these white spots (checked using v.what.vect). //d.vect Ind_rain_orig //The Ind_rain_orig looks like this - when the region is set to vector of Kerala //g.region vect=ker_rain_v http://n2.nabble.com/file/n3345107/Ind_rain_orig_reg_ker.png But when the region is set to Ind_adm2_v (whole country) the image is like //g.region vect=Ind_adm2_v //d.vect Ind_rain_orig http://n2.nabble.com/file/n3345107/Ind_rain_orig_reg_adm2.png Thanks Daljeet Moritz Lennert wrote: > > On 28/07/09 18:42, daljeet wrote: >> Hi Moritz, >> >> I am new to GRASS and the basic concepts of this field. Below, I tried my >> best to share all the information. Please write if I have missed >> anything. > > This is perfect, thanks ! > >> //creating the voronoi >> v.voronoi input="Ind_rain_orig" output="Ind_rain_ker_vor" >> >> //display the voronoi >> d.vect "Ind_rain_ker_vor" >> >> http://n2.nabble.com/file/n3344342/Ind_rain_ker_vor.png >> > > The problem is here, with v.voronoi, as you can see the white spots > here. What do the original points (Ind_rain_orig) look like ? > > I don't know the module well enough, but I think you might have hit a > bug there (I've just tried a simple example for myself and also get > weird white spots). Please file a report in the bug tracker. > > >> >> //storing the area of each polygon to a csv file >> v.report ker_rain_vor_over option=area units=k >ker_area.csv --o > > Note that you can use v.addcol and v.to.db upload the polygon areas to > the attribute table. > > Moritz > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user > > -- View this message in context: http://n2.nabble.com/how-to-calculate-area-of-voronoi-polygons-considering-the-boundary-of-the-catchment-tp3335923p3345107.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user