[R-sig-Geo] variogram

[Edzer Pebesma]

Anna, you didn't mention that you did a

library(spatial)

prior to this. Maybe you came to this by reading "Modern applied
statistics with S", but since package spatial was written many other
packages have arrived that do a better job for geostatistics with R. You
can find them from the Spatial task view,

http://cran.r-project.org/web/views/Spatial.html

(or from a CRAN mirror -> task views -> Spatial)

Hth,

On 02/09/2011 05:38 PM, Anna Gretschel wrote:
> 
> hi everybody!
> 
> i work with variograms. the r-functions i use are:
> 
>    
> surface<-surf.ls(1,data)                                               
> #  Trend Surface
>    v<- variogram(surface, nint||)                                        
> #  Variogram
> 
> nint ist the number of bins used. i interpreted this as the number of 
> distance classes (lag). the problem is, my data pairs are minimal 1 
> meter apart and maximal 35 meters. if i do a variogram by hand the 
> smallest lag i have is 1 meter and i have at most 20 distance classes. 
> Only i don't get it detrended by hand. if i do it in r i get it 
> detrended nicely but only if i use at least 60 for nint. that is a lot 
> though. how come that i have to use 60 bins? what exactly does r do?
> 
> thanks a lot!
> 
> Anna
> 
> 
> 
> 
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> 
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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.52north.org/geostatistics      e.pebesma at wwu.de