[R-sig-Geo] Fitting a 3D anisotropic variogram

[Carlo Innocenti]

Thank you.
I will check.

Carlo





2015-04-13 17:32 GMT+02:00 MacQueen, Don <macqueen1 at llnl.gov>:

> There may be something in the RandomFields or georob packages.
>
> --
> Don MacQueen
>
> Lawrence Livermore National Laboratory
> 7000 East Ave., L-627
> Livermore, CA 94550
> 925-423-1062
>
>
>
>
>
> On 4/13/15, 6:00 AM, "Carlo Innocenti" <carlo.innocenti at isprambiente.it>
> wrote:
>
> >Hello,
> >
> >anybody know a function to fit a theoretical 3D variogram model to the
> >experimental data?
> >
> >I work with pollution data from boreholes samples of marine sediment.
> >Generally the model that best fits to the data is a nested variogram with
> >both geometric and zonal anisotropy, composed by:
> >
> >- nugget effect
> >- spherical model with short range (< 1 m) along the z axis and very long
> >range (1000 km) along  x and y axis
> >- spherical model with very long range  (10^6 m) along the z axis and
> >medium range (< 1 km) along  x and y axis
> >
> >In the past I used Isatis to visually adapt the range of the model to the
> >experimental variogram and automatically fit the sill.
> >Now I'm moving on open source software and I'm looking for a way to fit at
> >least the sill of the 3D variogram to the data.
> >
> >I found that gstat allows to use the 3D variogram, but doesn't fit the
> >anisotropic ones, and geoR fit the anisotropic variogram but not the 3D
> >ones.
> >
> >Anybody knows a way in R to build and fit a variogram as that described
> >above?
> >
> >Thanks,
> >Carlo
> >
> >
> >
> >
> >
> >--
> >
> >
> >Carlo Innocenti, PhD
> >
> >ISPRA
> >Istituto Superiore per la Protezione e la Ricerca Ambientale
> >High Institute for Environmental Protection and Research
> >
> >Via Vitaliano Brancati, 60
> >00144 Roma
> >Italy
> >
> >phone: +39 06 5007 4639
> >email: carlo.innocenti at isprambiente.it
> >
> >       [[alternative HTML version deleted]]
> >
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>


-- 


Carlo Innocenti, PhD

ISPRA
Istituto Superiore per la Protezione e la Ricerca Ambientale
High Institute for Environmental Protection and Research

Via Vitaliano Brancati, 60
00144 Roma
Italy

phone: +39 06 5007 4639
email: carlo.innocenti at isprambiente.it

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