Re: [R-sig-Geo] anisotropic models vs. detrending

2010-08-23 Thread Scionforbai
> My end goal is to create the best sample spacing for a new > design based on the variogram.  In the anisotropic case I would create a > rectangular grid with stations in one direction closer than in the other. >  In the other "trend" case I would create a square grid.  This is the > question I am

Re: [R-sig-Geo] Best distance for a semi-variogram calculation

2010-08-17 Thread Scionforbai
> Is there a methodology to find the best distance to be used as a limit > for the calculation of a semi-variogram ? General practitioner rule: the half of the squared domain diagonal > Here is an example that is problematic for me : > I have a 300 km by 300 km grid regularly spaced points contai

Re: [R-sig-Geo] semivariogram + coordinate units

2008-04-10 Thread Scionforbai
nal anisotropy"); but they are meaningful only if you compute the directional variograms (one in the x-direction, one in the y-dir, each with its own unit). Do the transformation. ScionForbai ___ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch ht

Re: [R-sig-Geo] Signification of variance and error in "krige" and "krige.cv"

2007-10-01 Thread Scionforbai
red your questions, regards ScionForbai ___ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo

Re: [R-sig-Geo] Newbie Questions

2006-12-20 Thread Scionforbai
Hallo, just a couple hints: > In other words, I would like to know if there is a relationship between yield > and phosphorus, taking into account the spatial dependence. But how can I > test this? I think you should look at the cross-variograms. Or did you already reject this option? > Anothe