[gradsusr] meteosat grib2 (grb) files

[Athanasios Karagiannidis]

Dear Wesley

When I try to convert to PTD 4.0 I get the following

1:0:d=2016042507:FIREDI:no_level:-2147483647 missing fcst:

but i guess that is not a problem.

However, after converting to the new grid something goes wrong because the image seems shifted by 90 degrees to the north (please see test1.png). I tried some tests but nothing worked. For example when I asked for the regriding to start from 0 degrees north (wgrib2 new-fir.grb -set_grib_type c2 -lola 0:3600:0.1 0:1801:0.1 lola-fir.grb grib), I got the image of test2.png. The image there seems cut and not shifted to the north!

What can I do for that?

Kind Regards 
Athanasios F. Karagiannidis
Physicist, PhD Meteorology and Climatology
E-mail: thankar at live.com

Date: Tue, 26 Apr 2016 09:34:58 -0400
From: wesley.ebisuzaki at noaa.gov
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] meteosat grib2 (grb) files

Dear Athanasios,

There are two problems that need to overcome before displaying with GrADS.

1)  The file is using grib2 Product Definition Template (PDT) 4.30.   GrADS doesn't
      support PDT 4.30.   So the first step to convert to a PDT that GrADS can handle
      such as PDT 4.0.   (You should consider making the grib file with PDT 4.0 unless
      you want to document the spectral bands that are being used.)

      to convert to PDT 4.0:    wgrib2 201604250700-fir.grb -set_pdt +0 -grib new-fir.grb
      requires a newer wgrib2

If you want to see the raw grid (space view perspective)

     g2ctl -raw new-fir.grb >new-fir.ctl
     gribmap -i new-fir.ctl

2)  The other problem is that GrADS doesn't have the code to handle space-view perspective
       (orographic).   Wgrib2 to the rescue again.  Here we convert the field to a
       longitude-latitude 0.1 degree global grid.

        wgrib2 new-fir.grb -set_grib_type c2 -lola 0:3600:0.1 -90:1801:0.1 lola-fir.grb grib

 GrADS/g2ctl can handle lola-fir.grb


Yours,
Wesley


On Tue, Apr 26, 2016 at 5:10 AM, Athanasios Karagiannidis <thankar at live.com> wrote:



Hello to all.

I'm trying to open and visualize the contents of the "fire detection indicator" parameter that is included in meteosat grib2 file like the one I attach.

When trying to create the ctl file i get the following message.

[...]$ g2ctl.pl -0 201604250700-fir.grb >201604250700-fir.ctl
*** script needs to be modified ***
unknown user-defined grid

As a consequence the ctl file that is created can not be opened by gribmap

[...]$ gribmap -0 -i 201604250700-fir.ctl 
Open Error:  missing XDEF record 
Open Error:  missing YDEF record 
  The data file was not opened

and no idx file is created.

Could someone provide any help?
Athanasios F. Karagiannidis
Physicist, PhD Meteorology and Climatology
E-mail: thankar at live.com 		 	   		  

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