[R-sig-Geo] how to read CRU climatic data files with R?

[antonio rodriguez]

Nicolas Degallier wrote:
> Hi R helpers,
> 
> I have downloaded time series of climatic data from CRU (Climatic  
> Research Unit) which are ASCII files with a specific format for the  
> data.
> The format is described here:
> 
> http://www.cru.uea.ac.uk/~timm/grid/CRU_TS_2_1.html
> 
> under the link "file format".
> 
> I would like to know if somebody has already written some script in R  
> to open and manage these data, for example for selecting only  
> portions of the time series and/or pieces of the spatial grid?


Hi Nicolas,

You will find in that page, below Data structure section, a link to 
'software'. There you will find a package 'CRU2nc.tgz' which converts 
your ASCII data to 'netCDF' format. Then you can use any of the netCDF 
libraries available in R: ncdf,ncvar, RNetCDF, and the old netCDF.

I've found, at least for me, before to enter the data in R, to 
manipulate them with Ferret (http://ferret.pmel.noaa.gov/Ferret/) 
(subsetting regions and time intervals, etc.)

Hope this helps,

Antonio






> 
> Cheers,
> 
> Nicolas Degallier
> 
> UMR 7159 / IRD UR182
> Laboratoire d'Océanographie et du Climat, Expérimentation et  
> Approches Numériques (LOCEAN)
> Tour 45-55, 4e ét., case 100, 4 place Jussieu
> 75252  Paris Cedex 5  France
> 
> tél: (33) 01 44 27 51 57
> fax: (33) 01 44 27 38 05
> E-mail: <Nicolas.Degallier at ird.fr>
> 
> Publications (anonymous ftp):
> 
> ftp://ftp.lodyc.jussieu.fr/LOCEAN/ndelod
> 
> _______________________________________________
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> 


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