On Thu, Nov 14, 2013 at 11:15 AM, Hamish <hamis...@yahoo.com> wrote: > Hi, > > I just added in the dev branches two new flags for v.what.rast. > [...] > > The second flag changes the default containing-grid-cell method to a > weighted avg. of the 4 nearest raster cell centers (IDW). The search radius > is not very big [...]
AFAIK, IDW takes as argument the radius which is fixed to 1 which is questionable. Since v.what.rast samples a raster value at a given location, why not use the standard raster sampling methods nearest: nearest neighbor linear: linear interpolation cubic: cubic convolution lanczos: lanczos filter linear_f: linear interpolation with fallback cubic_f: cubic convolution with fallback lanczos_f: lanczos filter with fallback which are used by r.proj and i.rectify? The concept is essentially the same: for a given location, estimate the corresponding raster value. Markus M _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev