[R-sig-Geo] anistropy with residuals from KED

[Edzer Pebesma]

In general, the hope (and expectation) is that detrended residuals carry
less information in the sense of less structure than the raw data. The
rate with which this happens varies. I don't see any reasons why
detrending would "typically" lead to isotropic residuals; it could be
that the author has experienced this effect a number of times. You might
want to contact him; I believe he listens on the ai-geostats mailing list.

Tobin Cara wrote:
> Hello,
> 
> I was reading in Goovaerts book on Geostatistics for Natural Resources Evaluation that the residuals from KED are typically isotropic. In other words, any anisotropy must be accounted for in the trend model not in the residual semivariogram.
> 
> Is it the case in practice that anisotropy is never detected when finding the semivariogram with residuals or is it ignored (hopefully not)?
> 
> Thank you,
> 
> Cara
> 
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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