Re: ecmwf hybrid levels (fwd)

[Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>]

Hiya,

I'm interested in the Grib header information in the ECMWF data files.
An octal dump  shows a blank header, ie

Here's an od of a header from a file.
>                                            7   7   7   7  \0  \0  \0  \0
> 15674460  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
> 15674500   G   R   I   B

The 7   7   7   7 is the end of the previous grib record, then there are all
nulls to the word G   R   I   B which is the begining of the Grib 
message. I didn't see information in any of the grib headers. Also 
Grib1Dump didn't find any header information.

I'm looking for hybrid information in a Grib header.

Thanks,
Robb...

--------------------------------------------------------------------
                        Header : GRIB1
                    Discipline : 0 Meteorological Products
                  GRIB Edition : 1
                   GRIB length : 1558180
            Originating Center : 98 European Center for Medium-Range 
Weather Forecasts (RSMC)
        Originating Sub-Center : 0 WMO Secretariat
            Product Definition : 0 Forecast/Uninitialized Analysis/Image 
Product
            Parameter Category : -1 Meteorological Parameters
                Parameter Name : 133 Q Specific_humidity
               Parameter Units : kg kg-1
                Reference Time : 2008-09-07T00:00:00Z
                    Time Units : hour
          Time Range Indicator : product valid at RT + P1
                   Time 1 (P1) : 0
                   Time 2 (P2) : 0
       Generating Process Type : 132 Unknown
                    Level Type : 109 hybrid level
                 Level Value 1 : 26.0
                 Level Value 2 : 0.0
                    GDS Exists : true
                    BMS Exists : false
         Number of data points : 1038240
                     Grid Name : Latitude/Longitude Grid
                     Grid Shape: 0 spherical
         Spherical earth radius: 6367.47




> > >  testdata/grid/grib/grib2/ecmwf/
> ECMWF.2008.09.07.T00Z.uad_HGrbF00.A08334081908
> > > is described here apparently:
> > >
> > >  http://www.ecmwf.int/products/data/technical/model_levels/model_def_91.html 
> > > and according to this:
> > >
> > >  http://www.ecmwf.int/research/ifsdocs/DYNAMICS/Chap2_Discretization4.html#961180 
> > > "The values of the and for all are stored in the GRIB header"
> > should be:
> >
> > The values of a and b for all are stored in the GRIB header"
>
> John,
>
> Here's an od of a header from the above file.
>
>                                            7   7   7   7  \0  \0  \0  \0
> 15674460  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
> 15674500   G   R   I   B
>
> The 7   7   7   7 is the end of the previous grib record, then there are all 
> nulls to the word G   R   I   B which is the begining of the Grib message.  I 
> didn't see information in any of the grib headers. Also Grib1Dump didn't find 
> any header information. If they are referring to the above file name 
> ECMWF.2008.09.07.T00Z.uad_HGrbF00.A08334081908
>
> I looked for product ID information and I found the similar information to 
> the NCEP information using header patterns
>
> TTAAii  CCCC  YYGGgg    Product                      Area
>
> HHAA50  ECMF  YYHH00    500 hPa geopotential height  analysis          (NH)
>
> What header information are referring too and where is the documentation?
yes, thats the question. is it in section 2? can you contact ecmwf to find out?