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Re: NetCDF and empty variables [message #66129 is a reply to message #66128]

Sun, 19 April 2009 16:08

Mark[1]
Messages: 66
Registered: February 2008

Member

On Apr 18, 7:34 am, renaud.dussur...@gmail.com wrote:
> Well, as I've said, it is much nastier than this.
> varid returned by NCDF_VARID is correct
> (the variable exists in the netcdf file and this
> is its ID). The return of NCDF_VARINQ also suppose
> that this variable should have 3 dimensions
> (as, I think,the creator of this file
> intended it...) But there is simply NO DATA
> within this variable, and there is no way
> to check this before trying to get the
> data from the file.

To the best of my knowledge the only way you can get an "empty"
variable in a netCDF file is for that variable to depend on the
unlimited dimension, and for the unilimited dimension to have 0
records. You can check for the ID of the unlimited dimension with
NCDF_INQUIRE and then determine its size with NCDF_DIMINQ. You can
determine the dimensions associated with each variable with
NCDF_VARINQ. And you can use the ncdump utility (outside IDL) to give
you a user-friendly listing of the file structure and contents.

Yes, it's a pity IDL doesn't support empty arrays, isn't it?

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[Message index]

		Re: NetCDF and empty variables By: renaud.dussurget on Mon, 20 April 2009 05:18
		Re: NetCDF and empty variables By: renaud.dussurget on Mon, 20 April 2009 05:11
		Re: NetCDF and empty variables By: R.Bauer on Mon, 20 April 2009 02:25
		Re: NetCDF and empty variables By: Mark[1] on Sun, 19 April 2009 16:08
		Re: NetCDF and empty variables By: renaud.dussurget on Fri, 17 April 2009 12:34
		Re: NetCDF and empty variables By: liamgumley on Fri, 17 April 2009 08:55
		Re: NetCDF and empty variables By: David Fanning on Fri, 17 April 2009 06:46
		Re: NetCDF and empty variables By: Mark[1] on Mon, 20 April 2009 17:11

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