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20000201: Gempak decoder actions

Ka Kit,

You will edit your pqact.conf file to provide decoder pattern actions
such as those we previously discussed that are shown in the www page examples
*nwx.tbl and decoders.tbl).

The pqact.conf file format is:
FEEDTYPE <tab> PATTERN
<tab>   PIPE <tab> decoder_action
<tab>               decoder options
<tab>              decoder options
<tab>              output file

The TAB positions are very important in the pqact.conf file.
You use the TAB characters to space between the various
parts of the pattern action statement.
So for example, to run the dchrly metar decoder from pqact, you specify:

DDPLUS|IDS      ^S[AP].*
        PIPE    /usr/local/gempak/bin/sol/dchrly 
        -b 9 -m 24
        -d data/gempak/logs/dchrly.log
        -p /usr/local/gempak/gempak5.4/tables/pack/hrly.pack
        -s /usr/local/gempak/gempak5.4/tables/stns/sfmetar_sa.tbl
        data/gempak/surface/YYYYMMDD_sao.gem

The DDPLUS|IDS is the feedtype, meaning both DDPLUS and IDS data.
The pattern ^S[AP].* means to pass all data that start with SA or SP
(metar and speci reports), PIPE means to send the data directly to the 
input of the decoder. The decoder dchrly I show as an example as being
installed in the /usr/local/gempak/bin/sol/ directory (assuming here
that /usr/local/gempak/bin is the $NAWIPS directory).
The -b, -m, -d, -p and -s options pass information to the decoder,
The -d option tells the decoder where to log its status information
(you need tor create the directory ~ldm/data.gempak/logs).
The -p option points to the $GEMTBL/pack/hrly.pack file which
tells the decoder what parameters from the data to store in the gempak file.
The -s option points to the $GEMTBL/stns/sfmetar_sa.tbl station table for 
location
information to use with the stations reporting.

The final line in the sequence is the file name to putput the data to.
The data directory is relative to the ~ldm directory, so
this will store the GEMPAK data file in ~ldm/data/gempak/surface (again, you
have to create that directory).

The GEMPAK format file will be created like 
~ldm/data/gempak/surface/20000201_sao.gem.
Once you have decoded data in those files, programs like Garp can read the data 
and plot 
it for display. Garp uses the GEMDATA, SAT, HDS and other gempak variables
to located the decoded data files on your disk.

The data storage options for nwx are very similar, however, they
simply use the FILE action to store the data to a file instead of having to
PIPE it to a decoder. nwx displays text bulletins like forecasts which
are not decoded. Nwx relies on the $TEXT_DATA variable to find the data
stored under the ~ldm/data/gempak/nwx directory.

Steve Chiswell
Unidata User Support

>From: "Ka Kit Lai" <address@hidden>
>Organization: .
>Keywords: 200002011913.MAA22775

>Steve:
>   Sorry to bother you again because I really need to have gempak work this 
>week. I already create those directories and there is no problem launching 
>the gempak. Now comes to problem of how to load those data which comes in 
>from albany. I know the pqact.conf is used to define what actions will be 
>used to store the data on my system. But I dont know how to make the 
>modification to this file? Do I specify where are those files should be 
>stored? And how can I retrieve those files in the gempak? Do I need to 
>create any crontab job?
>
>                                           Ka Kit Lai
>
>
>
>
>
>>From: Unidata Support <address@hidden>
>>To: "Ka Kit Lai" <address@hidden>
>>CC: address@hidden
>>Subject: 200021: 2000131: Gempak Gemenviron file
>>Date: Tue, 01 Feb 2000 11:27:04 -0700
>>
>>Ka Kit,
>>
>>You have to create the directory that $SAT points to.
>>
>>I logged in and sourced Gemenviron, and successfully echoed GEMDATA.
>>
>>halo{root}% source Gemenviron
>>halo{root}% echo $GEMDATA
>>/usr/local/ldm/data/gempak
>>
>>halo{root}% echo $SAT
>>/usr/local/ldm/data/gempak/images/sat
>>halo{root}% ls $SAT
>>/usr/local/ldm/data/gempak/images/sat: No such file or directory
>>
>>So, the Gemenviron file is correctly setting the variables to what you have
>>defined, but you will have to create the $SAT directory which should be
>>$GEMDATA/images/sat. The TEXT_DATA directory that nwx will use will
>>also need to exist. Presumably you will have your LDM create these data 
>>products.
>>
>>The primary problem I see is that you have installed the Gempak 
>>distribution
>>into the same tree that you are using as your GEMDATA tree. While this will
>>not prevent you from using the software, it will be quite messy to 
>>maintain.
>>Typically, the gempak distribution is installed somewhere like /home/gempak 
>>or
>>/usr/local/gempak, and the data ($GEMDATA) is under the ~ldm/data/gempak 
>>tree
>>but the gempak data tree is not the same tree as $NAWIPS.
>>
>>At any rate, you will want to create your pqact.conf entries for your LDM 
>>to
>>create the data products that Gempak will use.
>>
>>Steve Chiswell
>>Unidata User Support
>>
>>
>> >From: "Ka Kit Lai" <address@hidden>
>> >Organization: .
>> >Keywords: 200002011808.LAA20422
>>
>> >Steve:
>> >    I can only load the xsharp and garo. But I cannot load nsat, nwx and
>> >ntrans in the GUI. The Env variable SAT is still not defined. The 
>>variable
>> >SAT is set to $GEMDATA/images/sat and I set the GEMDATA to
>> >/usr/local/ldm/data/gempak, but for some reason, I cannot echo GEMDATA 
>>after
>> >I source this file. Did I set GEMDATA to the wrong path because
>> >$GEMDATA/images/sat does not exist. Is there any other variable I need to
>> >change for gempak to work?
>> >
>> >                                     Ka Kit Lai
>> >
>> >
>> >>From: Unidata Support <address@hidden>
>> >>To: "Ka Kit Lai" <address@hidden>
>> >>CC: address@hidden
>> >>Subject: 2000131: Gempak Gemenviron file
>> >>Date: Tue, 01 Feb 2000 09:36:38 -0700
>> >>
>> >>Ka Kit,
>> >>
>> >>In copying/pasting the Gemenviron file, you wrapped an if statement
>> >>line so that the "(" was continued on the next line. I fixed
>> >>your Gemenviron file so that the line is contained on 1 line now.
>> >>
>> >>Steve Chiswell
>> >>Unidata User Support
>> >>
>> >>
>> >>
>> >> >From: "Ka Kit Lai" <address@hidden>
>> >> >Organization: .
>> >> >Keywords: 200002011600.JAA16074
>> >>
>> >> >I think I have the data feed from Albany now. But there is still some
>> >> >problem when I launching the gempak. I edit following path for the
>> >> >Gemenviron file:
>> >> >setenv NAWIPS /scratch/gempak
>> >> >setenv GEMDATA /usr/local/ldm/data/gempak
>> >> >
>> >> >But when I source this file, a message:
>> >> >
>> >> >Too many ('s
>> >> >
>> >> >appears, what does that means? I didnt touch any of the parenthesis 
>>and I
>> >> >dont think I have ever delete or add one. But I still can source this
>> >>file,
>> >> >but when I launch the gempak, something is wrong. The ntrans cannot be
>> >> >launch. And when I click on the nsat, it said:
>> >> >
>> >> >Env variable SAT is not defined.
>> >> >
>> >> >The variable SAT is set to $GEMDATA/images/sat and I set the GEMDATA 
>>to
>> >> >/usr/local/ldm/data/gempak, but for some reason, I cannot echo GEMDATA
>> >>after
>> >> >I source this file. Did I set GEMDATA to the wrong path because
>> >> >$GEMDATA/images/sat does not exist. Is there any other variable I need 
>>to
>> >> >change for gempak to work? If possible, please login to my machine and
>> >>take
>> >> >a look. I really appreciate it.
>> >> >
>> >> >                                      Ka Kit Lai
>> >> >
>> >>
>> >>**************************************************************************
> **
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>> >>Unidata User Support                                    UCAR Unidata
>> >>(303)497-8644                                                  P.O. Box
>> >>address@hidden                                   Boulder, CO
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>> >>Unidata WWW Service                        http://www.unidata.ucar.edu/
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>>Unidata User Support                                    UCAR Unidata 
>>(303)497-8644                                                  P.O. Box 
>>address@hidden                                   Boulder, CO 
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>>Unidata WWW Service                        http://www.unidata.ucar.edu/     
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