[Gstat-info] alpha parameter and isotropy

[G. Allegri]

>
> Edzer, that's what I thought, so could you help me to understand the two
> results?
>
>
> G. Allegri wrote:
> > Hello list,
> >  I've used the two following commands:
> >
> > 1 -
> > plot(variogram(EceZ~1,data=t,cutoff=3000,width=200,tol.hor=10),
> plot.numbers=T,type="l")
> > result: http://www.geospatial.it/allegri/EceZVAR.png
> >
> > 2 -
> > plot(variogram(EceZ~1,data=t,cutoff=3000,width=200,tol.hor=10
> ,alpha=c(0,90)),plot.numbers=T,type="l")
> > result: http://www.geospatial.it/allegri/EceZVAR_anis.png
> >
> > to do an isotropic ESV and the anisotropic one for 0 and 90 degrees.
> > The results for the 0 degress and the isotropic variograms are the
> > same... Now, I suppose that leaving out the alpha parameter, the
> > calculated variogram is not the isotropic one (as I thought) but the
> > one for the 0 direction.
> > So, to do an isotropic variogram I have to set tol.hor=360?
> >
> > Thanks,
> > Giovanni
>
> > ------------------------------------------------------------------------
> >
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> >
>
>
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