[gradsusr] Gribmap error with ECMWF open data

[Andrew Revering]

Wesley solved this problem for me.... I did the bold line of code below in
his response to convert the file to a format readable by gribmap and it
worked flawlessly. I didn't even have to recompile, my existing wgrib2
worked just fine.

Per Wesley Ebisuzaki at NOAA:

ECMWF has started distributing files using AEC compression.  GrADS/gribmap
use
NCEP's g2clib for reading grib2. AFAIK g2clib doesn't support AEC
compression.

The work around is to get a version of wgrib2 that was built with AEC
support.
The default build doesn't include AEC support because it requires a recent
version of CMake to build.  Once you get a version of  wgrib2 with AEC
support,
you convert the file from AEC compression to something that GrADS supports.

   *wgrib2 IN.grb -set_grib_type c3 -grib_out OUT.grb*

Unfortunately not all sites support CMake.  For example, CMake is not
available on CPC local workstations.

I am not aware of any efforts to add AEC support to g2clib.

Wesley

PS  building wgrib2
https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/compile_questions.html
<https://geotrack.email/ext/l?idx=quKrbNPRrLCJcODnKcWv&ret=https%3A%2F%2Fwww.cpc.ncep.noaa.gov%2Fproducts%2Fwesley%2Fwgrib2%2Fcompile_questions.html>




Andrew Revering
Convective Development, Inc.
dba F5Weather
Minneapolis, MN USA
http://www.f5weather.com/
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On Wed, Jun 28, 2023 at 9:46 AM Brian Gaze <brianw.gaze at googlemail.com>
wrote:

> ECMWF has changed the encoding used in GRIB2 products as part of the
> recent upgrade. This appears to cause a problem for Gribmap, for example:
>
> gribmap -i 81_2mtemp.grib.ctl
>
> Returns:
>
> gribmap: scanning GRIB2 file: 81_2mtemp.grib
> getdrstemplate: DRS Template 5.42 not defined.
> gribmap: ERROR! g2_getfld failed: ierr=12
>
> This is gribmap for GrADS Version 2.1.a2.oga.1
>
>
> Does anyone know a workaround or solution to this?
>
> Brian
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> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
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