[ncl-talk] NCL to replace CDO

[David Brown]

Ben,
I think Marston cannot use ncl_convert2nc because he wants to
interpolate to a lat/lon grid before saving the data to netcdf.

Karin,
The files that Marston made available to me are still on
ftp.cgd.ucar.edu in the zip file ifs_grib_types.zip.
 -dave

On Fri, Jun 30, 2017 at 4:29 AM, Benjamin Lamptey <bllamptey at gmail.com> wrote:
> Hi Marston,
> Maybe I am missing something. Why not use "ncl_convert2nc" command instead
> of an NCL script?
>
> Even if you have many files, you can use the command in a shell script.
>
> Sorry if I missed something earlier but the above command is easier to
> convert grib to netcdf.
>
> Regards
> Ben
>
> On Fri, Jun 30, 2017 at 11:10 AM, Karin Meier-Fleischer
> <meier-fleischer at dkrz.de> wrote:
>>
>> Hi Marston,
>>
>> as I'm also working in the CDO consultancy here in Hamburg, I would like
>> to have a closer look at your IFS file, too, to see if the CDO version 1.8.2
>> could handle it.
>>
>> If the file is not too large you can attach it to an 'offline' email to me
>> or upload it creating a new request on
>> https://code.mpimet.mpg.de/projects/cdo/boards/1 .
>>
>> Thanks in advance,
>> Karin
>>
>> Am 27.06.17 um 20:49 schrieb Marston Johnston:
>>
>> Hi,
>>
>>
>>
>> For years I’ve been using CDO to convert ECMWF’s IFS grib files to netcdf
>> and converting it from reduced Gaussian grid to regular lat lon.
>>
>> But CDO has not kept up the pace with updates and they do not respond to
>> many questions.
>>
>> Therefore, I’m attempting to move this part of my processing chain to NCL.
>>
>> I’m using NCL 6.5 (beta) to read the grib file (see attached log file).
>> There 1 or 2 problems and then I have a question.
>>
>>
>>
>> 1.)     My NCL script is not finding the experimental variables in the
>> grib file. These variables are given the generic names varXXX where XXX can
>> be between 88 and 111, for example.
>>
>> 2.)     The script also doesn’t find the 3D records. I’m not sure how NCL
>> finds these records in the grib file and then lists them as a 3D
>> (time,lev,lat,lon), not counting the time.
>>
>> 3.)     If 1 and 2 can be resolved, how can I then convert the reduced
>> Gaussian grid to regular lat lon? Would ESMF work if I setup a regular lat
>> lon grid?
>>
>>
>>
>> Appreciate your thoughts on this.
>>
>> /M
>>
>>
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> Marston S. Johnston, PhD
>>
>> Department of Earth Sciences
>>
>> University of Gothenburg, Sweden
>>
>> Email: marston.johnston at gu.se
>>
>> SkypeID: marston.johnston
>>
>> Phone: +46-31-7864901
>>
>> Only the fruitful thing is true!
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>>
>>
>>
>>
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>> --
>> Dipl. Geophys. Karin Meier-Fleischer
>> Visualization, NCL, CDO
>> Application Support
>>
>> Deutsches Klimarechenzentrum GmbH (DKRZ)
>> Bundesstrasse 45a - D20146 Hamburg - Germany
>>
>> Phone:    +49 (0)40 460094 126
>> Fax:      +49 (0)40 460094 270
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>>
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>>
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>
>
>
> --
> Benjamin L. Lamptey, PhD (Physicist, Meteorologist, Geoscientist, HPC & Info
> Systems)
> Acting Director-General
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