[R] climate data, Netcdf

[Roy Mendelssohn]

Hi Amen:


On Mar 15, 2012, at 2:19 AM, Amen wrote:

> I am a PhD student working on global scale. I am working at INRA in France.I
> am new to R
> 
> I downloaded a netcdf file           cruncep_tair_2010.nc.gz   from
> http://dods.extra.cea.fr/data/p529viov/cruncep/t2m/
> 
> in this file, temperature was measured every 6 hours for 2010, I want to
> convert to daily and then calculate the max ,min ,average daily temperature
> I will appreciate it very much if you kindly help me. 
> 
> How can I see the data using R, just to look at the table and then
> manipulate it
> 

First, install the package "ncdf4". How you do that will depend on the operating system you are using.  On Mac OS and Linux, the normal package manager will work, for Windows it is available from the developers site.

Second, assuming tat you have unzipped the file, do the following  commands to get yourself started:

library(ncdf4)
cruncepFile<-nc_open(' cruncep_tair_2010.nc')
cruncepFile
?ncdf4

Since you want to use R, it would be worth your while at that point to read through the R documentation to learn to do basic manipulations of data that is in your workspace.

HTH,

-Roy M.


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Roy Mendelssohn
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NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
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