[ncl-talk] Error when reading ICON data

[Mary Haley]

​Michael and Guido,

I believe the issue is that NCL doesn't currently handle unstructured data
in GRIB2 files. We already have a ticket open on this, NCL-2263, and I've
added your email to the comments, since you provided an excellent source of
data that we can download for testing.

Guido, I was able to do an ncl_filedump on the file as well, but I got a
fatal error, and also what looks like incomplete information. Are you
seeing something different?

fatal:NclGRIB2: Deleting reference to parameter; unable to decode grid
template 3.101

Variable: f
Type: file
filename: ICON_iko_model_level_elements_world_T_2017090512_111
path: ICON_iko_model_level_elements_world_T_2017090512_111.grib2
   file global attributes:
   dimensions:
      levels0 = 5
   variables:
      float levels0_l1 ( levels0 )
         long_name : unknown
         units : unknown

      float levels0_l0 ( levels0 )
         long_name : unknown
         units : unknown

I am also curious to know if CDO can convert this file to NetCDF...

--Mary
​

On Fri, Sep 1, 2017 at 7:35 AM, Guido Cioni <guidocioni at gmail.com> wrote:

> Hey Michael.
> first of all THANK YOU. I'm working here at the MPI-MET in Hamburg but
> didn't know at all that the data were freely accessible now. That's
> amazing!!
>
> Second, I think the problem relies in the NCL installation in your system.
> I just tried to read a data from the link that you provided into NCL (after
> testing a ncl_filedump command) and everything worked fine. I tried both on
> my local machine (Macbook) and on our supercomputer (Mistral).
>
> I guess you are missing something of the grib api library... Are you able
> to convert the file into netcdf first via CDO?
> Cheers
>
> On 1. Sep 2017, at 15:19, Michael Langguth <mlangguth at uni-bonn.de> wrote:
>
> Dear all,
>
> since an amendment in Germany, the German Meteorological Service (DWD)
> provides free output data access of the global model ICON (see:
> https://opendata.dwd.de/weather/icon/global/grib/). The data is stored in
> grib2-files.
> Unfortunately, NCL seems not be able to handle these grib2-files.
> Every time, when I try to open the file using the addfile-function, NCL
> gives the following error message:
>
> fatal:NclGRIB2: Deleting reference to parameter; unable to decode grid
> template 3.101
>
> I'm using NCL-version 6.3.0 (on a Linux cluster with openSUSE 42.1), but
> I've already tested the latest version 6.4.0, too (without success).
> Is there any way to add the missing grid template and to fix the problem?
>
> Example data can be generated by downloading and unpacking an arbitrary
> file from:
> https://opendata.dwd.de/weather/icon/global/grib/t/
>
> Thanks for your effort and best regards,
> Michael Langguth
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>
>
> Guido Cioni
> http://guidocioni.altervista.org
>
>
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