Re: Add variable in a NetCDF file. Variable POSITION

Good morning Hannes,

thanks a lot for replying to help. Actually, more than a problem in the order 
in the data, what actually happens is that my GISS file don't have a date, so  
in a way it seems that the order cannot be establishd; what I did was adding 
the time variable for each file, so that I now have files with the time set, 
but when i merge them with CDO the output that I obtain has no date anymore.

I'd be happy if u could send me your script so that I can try to use them 
following your suggestion. 

I let you know how that goes,

Thanks a lot 

All best

Simone


On Wednesday 30 May 2007 09:01, Hannes Isaak Reuter wrote:
> 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
> >
> >=========================================================================
> >===== To unsubscribe netcdfgroup, visit:
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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@xxxxxx
> 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."

-- 
Simone Marras, Ph.D. Student
BSC & Universitat Politecnica de Catalunya
Jordi Jirona 29
08034 Barcelona
Spain

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