[R-sig-Geo] periodic variograms

[Edzer Pebesma]

Paulo Justiniano Ribeiro Jr wrote:
> You could try with the wave model:
>   
>> require(geoR)
>> plot(c(0,100), c(0,1.5), type="n")
>> lines.variomodel(1:100,"wave", cov.pars=c(1, 5), nug=0.2)
>>     
>
> which is also implemented by other packages
>   
yes, as in:

library(gstat)
data(meuse)
coordinates(meuse)= c("x", "y")
v = variogram(log(zinc)~1,meuse)
plot(v, fit.variogram(v, vgm(1, "Hol", 200, 1)))

(you may need to update your gstat package to get sane results for it)
--
Edzer

>
>
>
> Paulo Justiniano Ribeiro Jr
> LEG (Laboratorio de Estatistica e Geoinformacao)
> Universidade Federal do Parana
> Caixa Postal 19.081
> CEP 81.531-990
> Curitiba, PR  -  Brasil
> Tel: (+55) 41 3361 3573
> Fax: (+55) 41 3361 3141
> e-mail: paulojus AT  ufpr  br
> http://www.leg.ufpr.br/~paulojus
>
>
>
> On Thu, 11 Dec 2008, Satterthwaite, Paul wrote:
>
>   
>> Hello,
>>
>>
>>
>> I am a beginner with R, and have 2 questions concerning
>> spatial/geostatistics. I doing a little exercise investigating
>> periodicity in artificial patch landscapes and resulting periodicity of
>> semivariograms.
>>
>>
>>
>> Does anyone know if there is an already-existing model semivariogram
>> that contains a "hole effect" that can dampen with increasing lag, i.e.,
>> includes some periodicity in the model semivariogram fit to the
>> empirical data?
>>
>>
>>
>> Any ideas would be GREATLY appreciated!
>>
>> Cheers!
>>
>>
>>
>> Sincerely,
>>
>>
>>
>> Paul M. Satterthwaite
>>
>>
>>
>>
>>
>> Paul M. Satterthwaite
>>
>> MS Student, Forest Science
>>
>> Richardson 201A
>>
>> Oregon State University
>>
>> Corvallis, OR 97331
>>
>> paul.satterthwaite at oregonstate.edu
>> <mailto:paul.satterthwaite at oregonstate.edu>
>>
>>
>>
>>
>> 	[[alternative HTML version deleted]]
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>>     
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>   

-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de/
http://www.springer.com/978-0-387-78170-9 e.pebesma at wwu.de