[R-sig-Geo] Variance estimation of an krigged area

[Edzer Pebesma]

On 04/06/2011 01:29 PM, Sébastien Durand wrote:
> Hello to all,
> 
> Since I did not get any answers I will reformulate my question may be I was not clear enough.
> 
> I am try to obtain one estimation variance of a whole area. That area is found within a SpatialPolygons, and it was also krigged using a regular grid.
> 
> I am looking for a similar "var" value as the one obtained for each point of the grid, but a value that would apply to the whole surface surface of interest.
> 
> That question would also apply to block krigging.  
> 
> I guess my question would be when we do block krigging using krige, is the variance error (var) given by the krige function is computed for the whole block krigged or only for the central point of the block (a punctual estimation)....

the block kriging variance is the estimation (prediction) variance for
the average value over the whole block.

> 
>  Thanks to all!
> 
> Sébastien
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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