[R-sig-Geo] 2D interpolation

[Roger Bivand]

On Wed, 23 Sep 2009, Christoph Hofer wrote:

> Dear list
>
>
> I am looking for a function that interpolate data points z in the x,y-plane.
> For the one-dimensional case this would be a "natural cubic spline". Is there
> a package where I find a function for "natural thin plate splines" for 
> interpolation?
>
> I found in the akima package the function interp. But this is not a thin 
> plate spline interpolation.

RSiteSearch("thin plate spline")

pulls up:

http://finzi.psych.upenn.edu/R/library/fields/html/Tps.html

as second hit for me. Try Tps() in the fields package.

Roger

>
>
> Best regards
>
>
> Christoph Hofer
>
>
>
>
>
> ____________________________
> ____________________________
> ETH Zurich
> Christoph Hofer
> Soil and Terrestrial Environmental Physics
> Institute of Terrestrial Ecosystems
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no