Re: [R-sig-Geo] [Gstat-info] LOCAL universal kriging with GLOBAL reg. coeff.estimation

2008-10-06 Thread Edzer Pebesma
Dave Depew wrote: A late follow up question to this thread What if the local neighbor hood was restricted to the range of autocorrelation? My impression was that values beyond that have little weight in the interpolation anyways. Often, yes. Three exceptions are (i) when the nugget forms

Re: [R-sig-Geo] [Gstat-info] LOCAL universal kriging with GLOBAL reg. coeff.estimation

2008-10-06 Thread Dave Depew
A late follow up question to this thread What if the local neighbor hood was restricted to the range of autocorrelation? My impression was that values beyond that have little weight in the interpolation anyways. I realize that this is of course not statistically optimal, but for those with

Re: [R-sig-Geo] [Gstat-info] LOCAL universal kriging with GLOBAL reg. coeff.estimation

2008-08-21 Thread Tomislav Hengl
Dear Radim, Edzer, I was thinking about the same problem few years ago (I assume that you work with auxiliary maps and not only coordinates). I think (have a feeling) that local and global Universal kriging should be treated as two things (especially if you put a very narrow search radius). T