[gradsusr] lats4d grib convertion problem

[A. S.]

Thank you, Arlindo!
That's what I thought, in fact - that I will have to deal with that parameter table...
Just wondered if there's a ready one for Offenbach, after I started to tweak it already.

Thanks, anyway.
Alon.

Date: Tue, 30 Aug 2011 21:43:18 -0400
From: dasilva at alum.mit.edu
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] lats4d grib convertion problem

2011/8/30 A. S. <irln at hotmail.com>






Hello,
I'm having some problem with cropping and subsetting GRIB files.
I found lats4d script very useful for that, but there is some annoying error it makes - in the resulting GRIB file it writes the wrong variable names (while in the resulting CTL file they are correct).


For example, I'm taking the lfff00120000p GRIB file (attached, together with its CTL and IDX),
and it has 5 fields inside: fi, omega, relhum, t, u, v.

You can see it in the attached lfff00120000p.ctl file, as well as by running "wgrib lfff00120000p".

Then I'm trying to extract only 2 fields, e.g. fi and t, to reduce the domain size, and t!
 o dump the result into a new GRIB file.
To do that, I'm using the following command:






  
  


lats4d.sh -i lfff00120000p.ctl -o lfff00120000p_crop.grb -format grads_grib -lat 29 33.5 -lon 34 36 -vars fi t

This command generates 3 new files: lfff00120000p_crop.grb, lfff00120000p_crop.ctl and lfff00120000p_crop.gmp (attached as well).

The resulting GRIB file seems to be valid, and the CTL file looks absolutely fine!
But when I try to run "wgrib lfff00120000p_crop.grb", instead of fi & t, I see PRES & PRMSL variables!

My guess is, that the lats4d script is in some way unaware of the fact that the original GRIB file is encoded according to Offenbach (center code 78) GRIB table, but I don't know how to define it.

Any help would be highly appreciated!

Thanks!
Alon.

You may need to setup a LATS PARAMETER TABLE for your file; enter
% lats4d.sh -h
and read the section on LATS PARAMETER TABLES. Please notice that the LATS documentation page is no longer available at PCMDI. Use the way back machine instead:

http://web.archive.org/web/20080920122353/http://www-pcmdi.llnl.gov/software/lats/

  Arlindo
 

P. S. some aditional technical info, don't know if it's relevant:

lats4d Version 2.1.5

Grads v2.0.a9.oga.1

Ubuntu 10.04 x86_64
 		 	   		  

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-- 
Arlindo da Silva
dasilva at alum.mit.edu


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