[gradsusr] netcdf files with different order of variables

Semyon Grodsky senya at umd.edu
Tue Feb 6 12:44:49 EST 2018


Jeff,

I am using CTL that templates all daily files. To open data

open CTL

--Senya


On 2/6/2018 12:30 PM, Jeff Duda wrote:
> Just curious how this goes. Are you using sdfopen to query the file? 
> In my experience viewing netCDF data in Grads, you can write a control 
> file to only view the specific arrays you want to display and omit the 
> rest from the VARS section. I've done exactly this with WRF output for 
> years. Have you tried this?
>
> Jeff Duda
>
> On Tue, Feb 6, 2018 at 7:21 AM, Jennifer M Adams <jadams21 at gmu.edu 
> <mailto:jadams21 at gmu.edu>> wrote:
>
>     Yes, it most definitely DOES matter!
>
>     Grads requires that the netcdf varids be consistent for each
>     variable in a templated set of data files. If the variables are
>     written out in different order in some of the data files, the
>     varids won’t be the same, and GrADS will get upset. I think using
>     NCO to rearrange the variables is your best option, but be careful
>     if the data are compressed/chunked — NCO will not retain existing
>     chunking parameters in the output file, and the defaults are not
>     GrADS-friendly. Use the —cnk_dmn option to specify which
>     dimensions should be chunked and what the chunk size should be.
>     —Jennifer
>
>
>
>     > On Feb 6, 2018, at 3:33 AM, M.Mahakur <mmahakur at TROPMET.RES.IN
>     <mailto:mmahakur at TROPMET.RES.IN>> wrote:
>     >
>     > It doesn't matter.
>     >
>     >
>     >
>     > ----- Original Message -----
>     > From: Semyon Grodsky <senya at umd.edu <mailto:senya at umd.edu>>
>     > To: GrADS Users Forum <gradsusr at gradsusr.org
>     <mailto:gradsusr at gradsusr.org>>
>     > Sent: Tue, 06 Feb 2018 09:43:43 +0530 (IST)
>     > Subject: [gradsusr] netcdf files with different order of variables
>     >
>     > Dear GRADS community,
>     >
>     > I face a bit unusual problem. I have data in netcdf fromat, but a
>     > portion of files has different order of variables. For an
>     example, some
>     > files has the following order of variables u,v,T.S while other
>     files -
>     > T,S, u,v.
>     >
>     > Is there a way to use all these data in GRADS?
>     >
>     > Alternatively, could smb suggest a simple (utility based) way to
>     unify
>     > the order of variables (say change T,S, u,v => u,v,T.S)?
>     >
>     > Thanks,
>     >
>     > --Senya
>     >
>     > --
>     > -----------------------------------------------
>     > Semyon Grodsky
>     > University of Maryland
>     > Department of Atmospheric and Oceanic Science
>     > Room 2409, Atlantic Building (224)
>     > 4254 Stadium Dr.
>     > College Park, MD 20742
>     >
>     > Phone:  301-405-5330
>     > Fax:    301-314-9482
>     > E-mail: senya at atmos.umd.edu <mailto:senya at atmos.umd.edu>
>     >
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>     >
>
>     --
>     Jennifer Miletta Adams
>     Center for Ocean-Land-Atmosphere Studies (COLA)
>     George Mason University
>
>
>
>
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>
>
>
> -- 
> Jeff Duda, Research Scientist
>
> University of Colorado Boulder
>
> Cooperative Institute for Research in Environmental Sciences
>
> NOAA/OAR/ESRL/Global Systems Division
>
> Boulder, CO
>
>
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-- 
-----------------------------------------------
Semyon Grodsky
University of Maryland
Department of Atmospheric and Oceanic Science
Room 2409, Atlantic Building (224)
4254 Stadium Dr.
College Park, MD 20742

Phone:  301-405-5330
Fax:    301-314-9482
E-mail: senya at atmos.umd.edu

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