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 I am attaching the tem for one location 45 .13 (log,lat) .(I extracted it using GIS but I don't know if I extracted them correctly) As you can see: time is from 1 to 1460, 1 means they the measure tem for the globe at the first 6 hours , 2=after 12 hours .....; and so on 1460 *6 = 8760 hours which equals 1 year first of all I want to convert from kelvin to degree 1 2 3 4 ------ 1 (min,max,averag)day one map(file) for the globe 5 6 7 8 ------ 2 second map(file) for the . ; ; ; 1460 ------- 365 days so in the end will develop 365 file for daily min Tem 365 file for daily max Tem 365 file for average daily Tem Thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/climate-data-Netcdf-tp4474329p4474329.html Sent from the R help mailing list archive at Nabble.com.
climate data, Netcdf
2 messages · Amen, Roy Mendelssohn - NOAA Federal
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
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
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e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
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