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Re: status africa data

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  • Subject: Re: status africa data
  • Date: Fri, 05 Jun 2009 12:10:13 -0600
Robb Kambic wrote:
> There is also a problem with the TOM_REALFORECASTS.20080112_v1_pf.grb grib
> that has ~50 perturbations in the file. The variables look the same to
> the our grib reader because ECMWF uses local additions to the PDS
> section to distinguish the variables. Using the ECMWF decoder gribex,
> the following local use information was displayed.
> 
> ECMWF local usage identifier.               30
>  Class.                                       1
>  Type.                                       11
>  Stream.                                   1035
>  Version number or Experiment identifier.  0001
> 
> I don't know what this means but it probably identifies the variables so
> they aren't treated the same. According to the WMO documentation it states:
> 
> 29-40    Reserved: need not be present
> 41-nn    Reserved for originating center use
> 
> So ECMWF is complying with the Grib1 specfications.

I'm not sure I understand how this is in compliance. Since 29-40 are
reserved, shouldn't they be using 41 or above for the local usage
identifier?

Ethan