Re: status africa data

Robb Kambic wrote:
> Hiya,
>
> As stated before, the NCEP data with multiple grids was split using 
> LDM pqact actions. Since that's not possible for the africa data, the 
> grid_id in the PDS section was used to split the data. But, the africa 
> data had grid_id = 255 for both grids so no split occurred. The data 
> is organized according to forecast time, first grid has forecasts 
> 6-240 and second grid has forecasts 246-360. The first grid has higher 
> resolution then the second grid. I can probably modify a current 
> program to do the split.
yes, you have to split by reading the gds, not through pqact.
> There is also a problem with the TOM_REALFORECASTS.20080112_v1_pf.grb 
> grib
what is this dataset?

> 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.
>
> The other 3 types of ECMWF files don't contain the perturbations so 
> they could be split according to forecast times.
>
> My question, is where do I go from here?
Apparently this is the same problem as in BUFR - local tables. So I 
suppose  we have to get the local tables from ecmwf ?
> Robb...
>
>
>
> Section 1 - Product Definition Section.
>  ---------------------------------------
>  Code Table 2 Version Number.               128
>  Originating centre identifier.              98
>  Model identification.                      130
>  Grid definition.                           255
>  Flag (Code Table 1)                   10000000
>  Parameter identifier (Code Table 2).       167
>  Type of level (Code Table 3).                1
>  Value 1 of level (Code Table 3).             0
>  Value 2 of level (Code Table 3).             0
>  Year of reference time of data.              8  (2008)
>  Month of reference time of data.             1
>  Day of reference time of data.              12
>  Hour of reference time of data.              0
>  Minute of reference time of data.            0
>  Time unit (Code Table 4).                    1
>  Time range one.                              6
>  Time range two.                              0
>  Time range indicator (Code Table 5)          0
>  Number averaged.                             0
>  Number missing from average.                 0
>  Century of reference time of data.          21
>  Sub-centre identifier.                       0
>  Units decimal scaling factor.                0
>
>
> ECMWF local usage identifier.               30
>  Class.                                       1
>  Type.                                       11
>  Stream.                                   1035
>  Version number or Experiment identifier.  0001
>
>
> =============================================================================== 
>
> Robb Kambic                       Unidata Program Center
> Software Engineer III               Univ. Corp for Atmospheric Research
> address@hidden           WWW: http://www.unidata.ucar.edu/
> ===============================================================================