[ncl-talk] NCL to replace CDO

Mon Jul 3 09:57:14 MDT 2017

Hi Marston and Dave,

I've tried to remap and convert your files with CDO version 1.8.2 but it 
fails for two of the three files. The file ICMGGECE3+199001 is a GRIB 1 
file and the others seem to have GRIB 1 and GRIB 2 mixed records which 
can't be handled by CDO.

I tried to convert the files to netCDF using the ECMWF grib-api/eccodes 
GRIB tools but those do not like reduced Gaussian grids.

Sorry, can't help yet but maybe we'll find a way to do it with CDO. ;-)

Bye,
Karin

Am 30.06.17 um 18:11 schrieb 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!
>>>
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>> --
>>> 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
>>> E-Mail:   meier-fleischer at dkrz.de
>>> URL:      www.dkrz.de
>>>
>>> Geschäftsführer: Prof. Dr. Thomas Ludwig
>>> Sitz der Gesellschaft: Hamburg
>>> Amtsgericht Hamburg HRB 39784
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>
>> --
>> Benjamin L. Lamptey, PhD (Physicist, Meteorologist, Geoscientist, HPC & Info
>> Systems)
>> Acting Director-General
>> African Centre of Meteorological Applications for Development (ACMAD)
>> 55, Avenue des Ministères, PL6
>> BP 13184, 1er Arrondissement, Niamey Plateau, Niger,
>> Tel.(+227)  20 73.49.92
>> Fax: (+227) 20723627
>> www.acmad.org
>>
>> Cell: +22796645655; +233265121750
>> Email: b.lamptey at acmad.org; bllamptey at gmail.com
>> Skype: benlamptey
>>
>>
>> _______________________________________________
>> ncl-talk mailing list
>> ncl-talk at ucar.edu
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>