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Re: NetCDF and empty variables [message #66202 is a reply to message #66142]

Tue, 21 April 2009 20:48

Mark[1]
Messages: 66
Registered: February 2008

Member

On Apr 22, 6:38 am, David Fanning <n...@dfanning.com> wrote:
> renaud.dussur...@gmail.com writes:
>> I've posted the a link to the original file on the other post:
>
>> ftp://ftp.ifremer.fr/ifremer/argo/dac/coriolis/69003/69003_p rof.nc
>
> Pretty weird. NONE of the HISTORY_* variables were
> populated in this file. I've modified my nCDF_Browser
> routine to handle this strange state of affairs.
> Download this new file:
>
> http://www.dfanning.com/programs/ncdf_data__define.pro
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Coyote's Guide to IDL Programming (www.dfanning.com)
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

First, please accept apologies for starting a new thread (I don't know
how that happened) and for not reading the other thread thoroughly
enough to see that the file had already been posted.

That said, there's nothing weird about this file except that it has an
unlimited dimension (N_HISTORY) with size zero. And that's not really
very weird at all.

The ncdump utility shows this:

$ ncdump -v HISTORY_PARAMETER 69003_prof.nc
netcdf \69003_prof {
dimensions:
DATE_TIME = 14 ;
STRING256 = 256 ;
STRING64 = 64 ;
STRING32 = 32 ;
STRING16 = 16 ;
STRING8 = 8 ;
STRING4 = 4 ;
STRING2 = 2 ;
N_PROF = 16 ;
N_PARAM = 2 ;
N_LEVELS = 94 ;
N_CALIB = 1 ;
N_HISTORY = UNLIMITED ; // (0 currently)
variables:
...etc

and so does IDL

IDL> id = ncdf_open('C:\Temp\69003_prof.nc')
IDL> inq = ncdf_inquire(id)
IDL> ncdf_diminq, id, inq.recdim, name, size
IDL> print, name, size
N_HISTORY 0
IDL> ncdf_close, id

And this is what I said in the first post of the current thread.

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[Message index]

		NetCDF and empty variables By: renaud.dussurget on Fri, 17 April 2009 06:18
		Re: NetCDF and empty variables By: Mark[1] on Wed, 22 April 2009 17:29
		Re: NetCDF and empty variables By: David Fanning on Wed, 22 April 2009 08:29
		Re: NetCDF and empty variables By: David Fanning on Wed, 22 April 2009 07:30
		Re: NetCDF and empty variables By: David Fanning on Tue, 21 April 2009 21:03
		Re: NetCDF and empty variables By: Mark[1] on Tue, 21 April 2009 20:48
		Re: NetCDF and empty variables By: David Fanning on Tue, 21 April 2009 11:38
		Re: NetCDF and empty variables By: renaud.dussurget on Tue, 21 April 2009 08:49

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