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
[email protected]
<mailto:[email protected]>
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--
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 [email protected]
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