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19990720: Gempak Questions

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 19990720: Gempak Questions
  • Date: Tue, 20 Jul 1999 15:40:03 -0600
Mark,

The GARP_PATH environmental variable is typically set by sourcing
the Gemenviron file as:
   setenv GARP_PATH $GARPHOME/config

Garp uses the variable to look for the Garp_defaults file in
the above directory. If you obtain case studies, or have archived
data with different file name than your Garp_defaults expects with
its keys, then you can create an alternate Garp_defaults file and place it in 
another location and reset your GARP_PATH variable before launching Garp.

I suspect case study data sets may need different keys than Unidata
real-time data sets- for instance they might have MM5, NOGAPS, or other
models, mesonets or different surface networks etc, so the ability
to use an alternate GARP_PATH variable is definitely needed.

Steve Chiswell
Unidata User Support



>From: Mark Tucker <address@hidden>
>Organization: .
>Keywords: 199907201946.NAA00402

>On Fri, 16 Jul 1999, Unidata Support wrote:
>
>> 
>> Check for differences in "NIDS" vs "nids" as directory names. Note that you
>> have to restart Garp after changing the defaults file.
> 
>The path was lower-case.  I should have seen this earlier.
>
>> 
>> 
>> >
>> >2. Model data.  This problem is similar to the NIDS issue above.   
>> >Currently we can only see AVN and ECMWF.  No changes to our data
>> >ingestion have been made.
>> 
>> When you say you are updating your lab, are you loading a new version of 
>> the Gempak distribution? I have changed some of the model keys in
>> the pl11 distribution since NOAAport has several ETA grids, AVN, MRF etc.
>> 
>> Peviously the model key would be "eta", now it is "eta_grid211" with
>> similar changes in the pqact.conf entry for dcgrib naming the
>> files with YYYYMMDDHH_eta_grid@@@.gem.
>> 
>> If this isn't it, then it would help to see the output of:
>> ls $HDS 
>> and your Garp_defaults.
>> 
>
>This appears to be the issue. We still have an older version of gempak
>doing our decoding so the model keys are still naming with the
>YYMMDDHH_eta.gem format.  I can (and probably will) upgrade gempak on our
>server along with the necessary changes to the pqact.conf file.  This does
>leave one significant issue:
>How can we use archived data, from case studies and local archives, with
>the current version of gempak?  Can the model key be temporarily changed
>on the workstations?  If so, how? 
>
>Mark Tucker
>Information Technology
>Lyndon State College
>address@hidden
>
>