[R-sig-Geo] variance estimation (gstat, geoR, automap)

[Paul Hiemstra]

Hi Pilar,

I think this list appropriate :). What would be a good idea is to get a 
book that describes kriging, some standard books are:

Chilès, J. & Delfiner, P. Geostatistics: Modeling Spatial Uncertainty 
John Wiley & Sons, New York, 1999
Christensen, R. Plane Answers to Complex Questions: The Theory of Linear 
Models Springer, New York, 1996
Journel, A. & Huijbregts, C. Mining Geostatistics Academic Press., 1978

A more practical book would be the Applied Spatial Data Analysis in R, 
see http://www.asdar-book.org/ for more info.

On the web you could look at:

http://www.kriging.com/, Owned by Isobel Clark
http://spatial-analyst.net/wiki/index.php?title=Main_Page, not sure if 
there is something here on  the theory of kriging.

For a description of kriging (quite mathematical) you can also look at a 
paper I wrote, you can download it from 
http://intamap.geo.uu.nl/~paul/Publications.html, it is the first one 
titled Read-time automatic...etc

This is all I could think of :).

cheers,
Paul

Pilar Tugores Ferra schreef:
> Dear all,
>
> I'm trying to estimate the variance of a global abundance estimation computed by kriging interpolation and I am stuck.
>
> One can easily retrieve the variance at each prediction location (either using the package gstat, geoR or automap) using expressions similar to:
>
>   
>> kriging_object$krige.var
>>     
>
> or >kriging_object$var1.var
>
>  
>
> but, in fact,  I have no idea how these variance values are computed.
>
> Could anybody tell me how is it computed or suggest  some reference material? 
>
> Could this question be inappropriate for this list in which case I would also apprieciate if someone could tell me where to ask it.
>
> Cheers,
>
> Pilar
>
>  
>
> Mª Pilar Tugores Ferrà
>
> PhD Student
>
> Instituto Español de Oceanografía
>
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>
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>
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>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul