I: R: Manage lat-lon thinned grid

[Diego Morelli]

If I repeat the procedure explained in my last mail, I found that I have the
same result also in grads ver 1.8SL-11.
Then, if you doesn't get me another news, I will finalize that the solution
is to use g2ctl in order to know the geographic area range and the grid
(i.e. xdef and ydef).

Diego

-----Messaggio originale-----
Da: Diego Morelli [mailto:diego.morelli at trs.it]
Inviato: mercoledì 4 novembre 2009 13.04
A: 'GRADSUSR at LIST.CINECA.IT'
Oggetto: R: R: Manage lat-lon thinned grid

Hello Wesley.

I seen that the conversion from grib1 file to grib2 file and, after, the use
of g2ctl.pl (using wgrib2) command to create the descriptor file, give
different information about variable names, levels, format of variable rows,
and in certain cases an information loss.

Your last news opened me a new road, and a new hope.

I tried to copy the two rows about xdef and ydef of descriptor file created
with g2ctl.pl into the descriptor file created with grib2ctl.pl (using
wgrib). Then I built the idx file with the gribmap command without problem,
and grads 2 is able to plot the maps.

My next step is to find a more elegant/correct method to built the
descriptor file.
Can you explain me what procedure and commands did you follow?

Diego

-----Messaggio originale-----
Da: GRADSUSR at LIST.CINECA.IT [mailto:GRADSUSR at LIST.CINECA.IT] Per conto di
Wesley Ebisuzaki
Inviato: martedì 3 novembre 2009 17.37
A: GRADSUSR at LIST.CINECA.IT
Oggetto: Re: R: Manage lat-lon thinned grid

Diego,

For file #1, I was able to plot it in the original grib1 format. No need
to convert it into grib2.

Wesley

Diego Morelli wrote:
> Hello Wesley.
>
> I'm very glad to receive your help.
>
> I just tried to use grads 2, convgrib and wgrib2 and the result is success
> for the "file #1".
>
> Ok for the file #2. Yours is a confirm that reinforce my opinion about its
> handling.
>
> Regards,
>
> Diego
>
>
> -----Messaggio originale-----
> Da: GRADSUSR at LIST.CINECA.IT [mailto:GRADSUSR at LIST.CINECA.IT] Per conto di
> Wesley Ebisuzaki
> Inviato: lunedì 2 novembre 2009 23.05
> A: GRADSUSR at LIST.CINECA.IT
> Oggetto: Re: Manage lat-lon thinned grid
>
> Diego,
>
> File #1: I was able to plot the thinned grid using grads 2a05.
> File #2: This file is hopeless. It is using complex packing of a grid
> which is legal grib1 but
> never used (AFAIK) until people started converting to grib2.
>
> Wesley Ebisuzaki
>
>
> Diego Morelli wrote:
>
>> * Problems *
>>
>> * *
>>
>> 1) I need to read with grads also the grib files with lat-long
>> “thinned” grids, I just know, by documentation, that my version
>> (1.8SL11) isn’t able to manage this kind of grib files. I put in the
>> attachment an example of this kind of file s (LFPW
.)
>>
>> 2) I have some files that are managed by grads without error (version
>> 1.8SL11), but the display command says: “Entire Grid Undefined”. I put
>> in the attachment an example of this kind of file s (YMID
.)
>>
>> * My questions *
>>
>> How can I view, on a picture, information contained in files like
>> those in the attachment?
>>
>> Is there any version of GrADS that manage them?
>>
>> Is there some work-around that I can follow to satisfy my need?
>>
>> If no, do you know any other software that I can be used?
>>
>> We are willing to pay for any new SW developments or your advice. Can
>> you help us?
>>
>> Best regards,
>>
>> Diego
>>
>> -------------------------------------
>>
>> Diego Morelli
>>
>> T.R.S. S.p.A.
>>
>> Via della Bufalotta, 378 - 00139 Roma
>>
>> Tel. 06.87281.301
>>
>> Fax 06.87281.550
>>
>> diego.morelli at trs.it
>>
>>