Rajni,
you generally do not need to detrend if using ordinary kriging (or other linear weighted average estimator) in the interpolation case, i.e., when the points you're estimating are surrounded by data in (generally) all sides, and particularly in the direction(s) of the trend. Also, a relatively small neighborhood should be used (generally less than the variogram ranges; as opposed to large neighborhoods or on at all). In such case, universal kriging or IRF-k would not give you any additional advantage.
One possibel reference is Journel, A.G., and
Another could be Rossi , M.E. , and Posa, D., "Stationary and Non‑stationary Kriging Applied to Dissolved Oxygen Data", Metron‑International Journal of Statistics, Vol. 47, No 1‑4, 1989, Rome
Cheers,
Mario
Rajni Gaur <[EMAIL PROTECTED]> wrote:
Dear List,
I have a querry again.
In what cases can we avoid the detrending of the piezometric data
sets. Is it always necessary to go for detrending the data?
could you please provide me the references too.
thanks to all
Rajni
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Mario E. Rossi
GeoSystems International
Ph: 561-495-8797
Fax: 561-498-1262
GeoSystems International
Ph: 561-495-8797
Fax: 561-498-1262
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