[R] how do you interpolate a gaussian grid to a standard 2.5 degree grid?

[Zhuanshi He]

Hi Jenny,

Maybe the following links will be useful for you. Both of thoes are
used in meteorological and climate research community. But u can used
the codes to create the data values that you need.


g2fsh : Interpolates a scalar quantity from a Gaussian grid to a fixed grid.

http://www.ncl.ucar.edu/Document/Functions/Built-in/g2fsh.shtml


g2fshv : Interpolates a vector quantity from a Gaussian grid to a fixed grid.
http://www.ncl.ucar.edu/Document/Functions/Built-in/g2fshv.shtml


In addition, both of those functions based on a package named
SPHEREPACK (http://www.cisl.ucar.edu/css/software/spherepack/ ).

you can write call subroutines shipped from SPHEREPACK to get values
at your fixed grids.

Good luck.

Zhuanshi He



On 12/12/06, Jenny Barnes <jmb at mssl.ucl.ac.uk> wrote:
>
> Dear R-help community,
>
> I have looked on the R search site and archives but cannot find mention of a way
> of interpolating a gaussian distribution of data to a standard 2.5 degree grid.
>
> I have two global dataset and I need to correlate - unfortunately one is a 2.5
> degree grid dim[longitude=144,latitude=72] and one is gaussian
> dim[longitude=192,latitude=94].
>
> I would rally appreciate hearing back from any of you who may have wanted to
> interpolate your data is this way. If there is no ready-made function you know
> of but you are willing to share your own methods I would also appreciate any
> pointers.
>
> Many thanks for your time,
>
> Jenny Barnes
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jennifer Barnes
> PhD student - long range drought prediction
> Climate Extremes
> Department of Space and Climate Physics
> University College London
> Holmbury St Mary, Dorking
> Surrey
> RH5 6NT
> Web: http://climate.mssl.ucl.ac.uk
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>


-- 
Zhuanshi He / Z. He (PhD)
Waterloo Centre for Atmospheric Sciences (WCAS)
Department of Chemistry
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