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Re: DCGRIB

Robert,

What does the gdinfo output show for the number of grids decoded and
max in the file? The size of the decoded file is not an issue unless your
account limits restrict you to that.

Try using dcgrib2 and log the decoder output to see what error messages are
produced with:

dcgrib2 -m 25000 -d eta.log -v 2 eta.gem < eta..
 
Steve Chiswell
Unidata User Support

   
On Tue, 7 May 2002, Robert Dewey wrote:

> 
> Steve,        
> 
> I am having a problem with DCGRIB. I am running GEMPAK 5.6.F on RedHat Linux 
> 7.2. The data I am receiving is the 3hr ETA grib files from the 
> ftpprd.ncep.noaa.gov site. The data does go out to 84hrs, but I only want 
> data out to 60hrs. After I download the data, I run a shell script to decode 
> the data...However, it only decodes the first 2 files, and then stops at 
> EXACTLY 63.9mb...no more, no less. When I check the shell script logs, it 
> appears as though the decoder keeps running, it just isnt decoding anyting 
> beyond file 2. 
> I dont think that a 63mb file is too large for GEMPAK, considering other 
> *.*GEM files I have, such as RUC...are as large as~90mb. In the script, you 
> can see where I set the -m value to its max, hoping that maybe that would fix 
> it, but no luck. Also, this script seems to work for the other models, all I 
> did here was edit those scripts to fit the model data I am downloading.Here 
> is a copy of my shell script...
> 
> ----------------------------------------SNIP------------------------------- 
> #!/bin/sh
> HOME=/home/gempak/NAWIPS/gempak/data
> csh <<EOF
> cd /home/gempak/NAWIPS
> source Gemenviron
> bash
> cd $HOME/grib
> #
> dcgrib -m 30000 eta.gem < eta1
> dcgrib -m 30000 eta.gem < eta2
> dcgrib -m 30000 eta.gem < eta3
> dcgrib -m 30000 eta.gem < eta5
> dcgrib -m 30000 eta.gem < eta6
> dcgrib -m 30000 eta.gem < eta7
> dcgrib -m 30000 eta.gem < eta8
> dcgrib -m 30000 eta.gem < eta9
> dcgrib -m 30000 eta.gem < eta10
> dcgrib -m 30000 eta.gem < eta11
> dcgrib -m 30000 eta.gem < eta12
> dcgrib -m 30000 eta.gem < eta13
> dcgrib -m 30000 eta.gem < eta14
> dcgrib -m 30000 eta.gem < eta15
> dcgrib -m 30000 eta.gem < eta16
> dcgrib -m 30000 eta.gem < eta17
> dcgrib -m 30000 eta.gem < eta18
> dcgrib -m 30000 eta.gem < eta19
> dcgrib -m 30000 eta.gem < eta20
> dcgrib -m 30000 eta.gem < eta21
> 
> -----------------------------------------SNIP------------------------------------
> 
> Each "eta" file that I downloaded are about ~8mb. When I decode a single ETA 
> file, I get a *.*GEM of ~30mb...So it seems as though the eta.gem is only 
> holding a max of 60mb (2 ETA files). Can you help with this problem? 
> I used to just download the already compiled *.*GEM files from NCEP, but they 
> are changing servers and are no longer proving GEMPAK files.
> 
> Thanks
> Robert D Dewey
> 5 7 2002
>