s.sample

[Wayne Gibson]

Dear GRASS users,

Can someone explain the advantages of using bilinear interpolation vs cubic  
convolution in s.sample?

The cell values of the raster data set that is being analyzed represent areal  
averages.  From the GIS books that I've consulted, cubic convolution gives more
  
stable areal estimates.  But are there any specific cases where bilinear  
interpolation would give better estimates?  (e.g. high gradient vs low gradient
  
areas)


Wayne Gibson
Oregon State University