Re: Grib2 satellite data

Hi Axel,

I have looked at your file and also examined the relevant part of the
latest source code of the NCEP-supplied GRIB 2 C API code. Your
diagnosis is correct. The NCEP code does not yet have an entry for PDS
template 31. We don't really like to have to modify external
libraries, because it creates a lot of support hassles, but if we can
get by with a small change we might consider it. I will look into the
extent of the changes required.
  -dave

On Sep 25, 2009, at 5:29 AM, Axel Seifert wrote:

>
> Dear all,
>
> I have a GRIB2 file with MSG data which I would like to read with NCL.
> Unfortunately, I get the following error from ncl_filedump:
>
> getpdstemplate: PDS Template 4.31 not defined.
> warning:Error unpacking GRIB record section 4.
> fatal:Could not open (MET9_IR108_cosmode_0909210000.grib2)
>
> The NCEP web page
>
> http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc.shtml
>
> does not seem to list a PDS 31 template, so I guess the problem is
> that
> the NCEP API does not support this template?
>
> The ECMWF Grib API can read the file, e.g., the PDS looks like
>
> Product Definition Section (PDS):
>
> Template Number: 31
> Template:
> Satellite Product.
> 1 0 Parameter category (see Code Table 4.1)
> 2 2 Parameter number (see Code Table 4.2)
> 3 8 Type of generating process (see Code Table 4.3)
> [ Code Table 4.3: 8 = Observation ]
> 4 0 Observation generating process identifier (def. by
> orig. centre)
> 5 1 Number of contributing spectral bands (NB)
> 6 333 Satellite series of band nb (code table def. by orig./
> generating centre)
> 7 72 Satellite numbers of band nb (code table def. by
> orig./generating centre)
> 8 207 Instrument types of band nb (code table def. by orig./
> generating centre)
> 9 0 Scale factor of central wave number of band nb
> 10 92592 Scaled value of central wave number of band nb
> (units: m-1)
>
> Any comments or help are appreciated.
>
> Best regards, Axel
>
>
>
>
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Received on Fri Sep 25 2009 - 11:18:53 MDT