[R-sig-Geo] maxdist for kriging with an external drift

[Cutberto Uriel Paredes Hernández]

Dear Edzer,

Would it be correct to say then that if a neighbourhood is specified
in the krige command the result would be that of Kriging with an
External Drift (KED), otherwise it would be that of Simple Kriging
with varying local means (SKlm)?

Apologies for posting on this thread but I was about to post a
similiar question.

Thanks, Cutberto.

2010/1/26 Edzer Pebesma <edzer.pebesma at uni-muenster.de>:
> Yes, that is right.
>
> Els Verfaillie wrote:
>>
>> Dear list,
>>
>>
>> I want to use Kriging with an external drift for a sedimentological
>> dataset
>> of grain-size that has a linear relation with the depth.
>> Am I correct that when I set a 'maxdist' using the krige command, that a
>> trend for the primary variable (grain-size) is calculated as a local
>> linear
>> function of the secondary variable (depth)? Is this function thus
>> different
>> for each interpolation window?
>>
>> d50.ked.dir50 <- krige(D50F~depth, locations=ds50, newdata=Depth,
>> model=d50.fit.var.50, nmin=2, nmax=16, maxdist=9000)
>>
>>
>> Thank you for your help.
>>
>>
>> Best regards,
>>
>> Els Verfaillie
>>
>>
>> ______________________________________________
>>
>> Dr. Els Verfaillie
>>
>> Carto-GIS cluster
>>
>> Ghent University (UGent) - Department of Geography
>>
>> ______________________________________________
>>
>>
>>
>>
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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
>
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