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RE: 20020328: GEMPAK grid limits (fwd)

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  • Subject: RE: 20020328: GEMPAK grid limits (fwd)
  • Date: Thu, 28 Mar 2002 11:16:22 -0700

---------- Forwarded message ----------
Date: Thu, 28 Mar 2002 10:26:25 -0600
From: "Nelson, Michael" <address@hidden>
To: 'Steve Chiswell' <address@hidden>
Subject: RE: 20020328: GEMPAK grid limits

Hi,
        Sorry, I should have checked gdinfo.  I thought I had the number of
grids set to 30,000 in my script, but it was only set to 15,000 so it should
be able to handle it.   The Gempak files are getting quite large already
without all of the data.  For data through 141 hours size is up to 1.28 GB.


Thanks for your quick response it helped me out.

Mike Nelson
address@hidden

-----Original Message-----
From: Steve Chiswell [mailto:address@hidden]
Sent: Thursday, March 28, 2002 10:07 AM
To: Nelson, Michael
Subject: 20020328: GEMPAK grid limits



The current maximum number of grids is 30,000. That will be a very large
file
for the 1 degree AVN where each grid is 30 to 100KB, and eventually you may
hit
the 2GB file size limit on most systems. How many grids did you define in
MAXGRD
in NAGRIB? What is the decoded file size when you hit the limit, and how
many
grids does GDINFO show in the file?

Alternatively, you can use dcgrib2 with the file templates and store each
forecast hour in a separate file.

I plan on making a new release shortly and will look at the current limits-
but
the operating system limits of filesize are another issue that the larger
grids will run into (eg 12km ETA, .5 degree AVN, 384 hour AVN runs etc.)

Steve Chiswell
Unidta User SUpport



On Thu, 28 Mar 2002, Nelson, Michael wrote:

> Hi,
>       I was wondering if there is any plan to release a new binary version
> of GEMPAK with the capability for an increased number of grids.  The NWS
> started releasing the AVN on one degree grids to 180 hours yesterday.
> Currently nagrib can only decode out to the 17th grid in the 144 hour
> forecast file.
>
> Thanks for any info,
>
> Mike Nelson
> address@hidden
>
>
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