[gradsusr] R: About forecast validity and geographical zone.

[Diego Morelli]

Ok Davide.
Can you say me if I have understood:
 1- The "grib2ctl.pl -verf <filename>" give me information (on tdef) about
the expiration time of forecast, while "grib2ctl.pl <filename>" give me
information about the start time of forecast.

2- If I want to plot on GrADS all the meteo maps contained in a unique grib
file, I have to split this file in more files each one having information on
a unique geographical zone and a unique validity, so that I can use GrADS
for each file: GrADS works on a sequence of grib records that are referred
all to a unique geographical zone and a unique validity.

Thank you in advance,

Diego


-----Messaggio originale-----
Da: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] Per
conto di Davide Sacchetti
Inviato: lunedì 12 aprile 2010 13.51
A: GrADS Users Forum
Oggetto: Re: [gradsusr] About forecast validity and geographical zone.

Dear Diego,
use "grib2ctl.pl -verf <filename>", (grib2ctl was an old shell script)

about the different geographical areas you should split your grib file

if this does not help you can contact me directly

Bye bye
Davide


On Fri, 2010-04-09 at 17:51 +0200, Diego Morelli wrote:
> I have seen that
> 
>       * in a grib file there can be more than one grib record and also
>         that each record can contain information about a validity of
>         forecast time, or about a geographical zone, different from
>         the other record. These is also highlighted using wgrib. 
>       * The grib2ctl issue a descriptor file without information about
>         forecast validity (doesn’t it?) 
>       * The grib2ctl issue a descriptor file with geographical
>         information contained in only one record
>       * GrADS can show only information descripted in the descriptor
>         file: It shows only the data correspondent to an internal zone
>         of the geographical area just setted in the descriptor file
> 
>  
> 
> My questions are:
> 
>  
> 
>       * The maps issued by GrADS, at what validity is referred (in the
>         case of more validity present in a grib file)?
>       * In the case that I have a file with records referred to more
>         than one forecast validity, how can I extract the map
>         correspondent to all validity?
>       * How can I extract information about all geographical zone
>         contained in the unique grib file?
> 
>  
> 
> These are the product I’m using:
> 
>  
> 
> grib2ctl v0.9.12.5p45
> 
> wgrib v1.8.0.12
> 
> GrADS Ver. 2.0.a7.1
> 
>  
> 
> In the attachment, there is an example of the two kind of files I
> spoke above: file LFPW_70.b is referred to a unic forecast validity of
> 30 Hours, and cover a geographical zone Lat(-90,90), Lon (-120,150).
> 
> The other file contains 2 validity: 12 Hours and 6 Hours
> 
>  
> 
> Regards,
> 
>  
> 
> Diego
> 
>  
> 
> Diego Morelli
> 
> T.R.S. S.p.A.
> 
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr


-- 
Sacchetti Davide
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione
Liguria
ARPAL Unità Tecnica Complessa di livello Regionale
V.le Brigare Partigiane 2 16121 Genova (I)
tel: +39 010 6437535                    fax: +39 010 6437520
mail: davide.sacchetti at arpal.org     web: www.meteoliguria.it

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