[ncl-talk] NCL to replace CDO

[Marston Johnston]

Hi Dave,

One more thing. IFS (OpenIFS) produces 2 kinds of grib: gridpoint and spectral grib files.
I can provide examples of these.

/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!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

On 2017-06-27, 20:58, "David Brown" <dbrown at ucar.edu> wrote:

    Hi Marston,
    Do you get errors when you read this file? Can you let us know where
    to get a sample IFS grib file similar to the one you sent the dump
    for? Thanks.
     -dave
    
    On Tue, Jun 27, 2017 at 12:49 PM, Marston Johnston <shejo284 at gmail.com> wrote:
    > 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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