Re: [R] kriging problem(?)

From: Paul Hiemstra <p.hiemstra_at_geo.uu.nl>
Date: Fri, 04 Jul 2008 12:10:33 +0200

Hi Robert,

A package I use for spatial statistics is gstat. It supports a method called co-kriging that seems to fit your needs. To get a good overview of the spatial capabilities of R a good place to start is the Spatial Task View (http://cran.r-project.org/web/views/Spatial.html). If you have more geo type questions the r-sig-geo list is a better forum (https://www.stat.math.ethz.ch/mailman/listinfo/R-SIG-Geo/).

cheers
Paul

robert.ptacnik_at_niva.no wrote:
> Hei,
> I have two spatial datasets Sa and Sb, both with lat-lon coordinates and
> from same geographic area, but from different localities within the area
> (independent samples). Sa is biotoc data, Sb is some environmental
> parameter (fertility). I 'know' that Sb affects Sa, but wonder on which
> scale. I tried different interpolations by creating different grids of Sb
> (e.g. 20x20 and 100x100 points using 'interp' ...) and found that a more
> coarse grid did a better job in predicting Sa than a high resolution grid.
> However, I wonder if there aren't more elegant ways, e.g. using kriging.
> Just to avoid misunderstandings: I do not just want to get a spatial grid
> of Sa and Sb, but I want to find on which Scale Sb affects Sa.
> cheers,
> Robert,
>
>
> Robert Ptacnik
> Norwegian Institute for Water Research (NIVA)
> Gaustadalléen 21
> NO-0349 Oslo
> FON +47 982 277 81
> FAX +47 221 852 00
>
>
>
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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: 	+31302535773
Fax:	+31302531145
http://intamap.geo.uu.nl/~paul

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Received on Fri 04 Jul 2008 - 10:19:18 GMT

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