Add variable in a NetCDF file. Variable POSITION

[Hannes Isaak Reuter]

Dear Simone,


if I understand you correctly you want to use CDO 
to merge files with different variables order.
I had the same problem as i was merging data 
coming from ECMWF weather forecasts, where the 
data are not always in the same order.. ( due to 
the differnet run time of the program codes)
I talk to uwe, and the solution we came up is: 
use selcode to write out a variable in a loop and 
add back to a final file, which then contains all 
variables in order. ( go over all files..
If you need a csh/cdo script for that, i already have one around.
hannes



At 07:34 PM 5/29/2007, Simone Marras wrote:
>Thank you Philippe for the answer and the hint.
>
>I tried all the options i have, and I am starting to think that it is not the
>time that is affecting the CDO merge option, but some other variables in my
>GISS files, because even by changing the date position by running the *.c
>generated code (coming from "ncgen file > file.c") I still obatin a merged
>file that has all the variables, but the time is not there anymore.
>
>In case anyone else had the same problem using CDO mergetime, please, let me
>know!
>
>Regards and thanks
>
>simone
>
>On Tuesday 29 May 2007 17:01, Philippe Poilbarbe wrote:
> > Simone Marras a écrit :
> > > ...
> > > Is there a way to control the position inside the file where the variable
> > > value is added?
> > > I need to put it in a certain position because when I use CDO to merge
> > > several files, the output merged file does not have a date anymore.
> > > ...
> >
> > No there is no way to control the position: they are in
> > the order they have been created (with a little exception
> > for 'record' vars).
> > Anyway no program should take into account the position
> > of the variable (in fact linked to the var Id) but only
> > the names.
> >
> > For CDO (I don't know it except its name), it is a bit
> > strange that a "generic" program throw away a variable
> > due to its position.
> > It may be related to some CDO options usage or the way
> > it is working (I did have some problems like this
> > with the NCO programs): check all options.
> >
> > To see if it is related to the position, you can try
> > to export your NetCDF file with ncdump, then with a
> > text editor move the variable (in the header only, it
> > is sufficient) where your think it should be and then
> > regenerate the file with ncgen. Rerun CDO with this
> > new file and it is probable that you will have the
> > same result (and normally it should be the same).
> >
> > If it is not the same result (except, maybe for
> > variable positions if the resulting file), it may
> > be a CDO bug.
>
>--
>Simone Marras, Ph.D. Student
>BSC & Universitat Politecnica de Catalunya
>Jordi Jirona 29
>08034 Barcelona
>Spain
>
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Hannes Isaak Reuter
Institute for Environment and Sustainability - 
Land Management and Natural Hazards Unit - 
European Commission - DG Joint Research Centre
TP 280, Via Fermi 1, I - 21020 Ispra (VA), Italy
tel +39-0332-78.5535, fax +39-0332-78.6394, 
Cell:+39-3479720381, e-mail: hannes.reuter at jrc.it
www: http://eusoils.jrc.it/
"The views expressed are purely those of the 
writer and may not in any circumstances be 
regarded as stating an official position of the European Commission."


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