We have .grd files for every year which has daily data. We want to find the average for some years, can we do it using cdo?
Also, is there any command or script to convert the grd files to netcdf and then use cdo command? Thank you!
I'm not sure if you can average directly the .grd files, but what you can do is convert them first to .nc files:
cdo -f nc input.grd output.nc
and then do the averaging.
Hope this helps.
Hello,
cdo has the capability to read and write grib files. However, some precompiled binaries (from some Linux program repositories) neglect this feature sometimes.
Depending on the wanted average, you compute, for instance:
cdo timmean input.grb output.grb (all time mean)
cdo yearmean input.grb output.grb (year mean)
cdo monean input.grb output.grb (monthly mean)
-- please inspect the section "Statistical values " in the documentation
https://code.mpimet.mpg.de/projects/cdo/embedded/index.html#x1-3490002.8
During the averaging you could convert the files on the fly,
cdo -f nc timmean input.grb output.nc
see in section "Options" the flags "-f" and for some file formats the additional flags "-b", and "-z"
https://code.mpimet.mpg.de/projects/cdo/embedded/index.html#x1-70001.2.1
Since grib files hold meta data via code tables, you may name one of the available code tables or provide you own one via the "-t" flag. This is not necessary, but I consider it as a good practice if you want to share files.
Good luck with the data processing.
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