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20020425: Gempak decoders with LDM

Dongyu,

The paths in pqact.conf are relative to the ~ldm account directory.

The sample GEMPAK decoder entries I provide at:
http://www.unidata.ucar.edu/packages/gempak/tutorial/pqact/decoders.tbl
show the use of decoders/dc..... for the executable path.

You can either create a link from your $GEMEXE directory to 
~ldm/decoders (so that a ~ldm/decoders/dcuair finds your $GEMEXE/dcuair file),

or 

create a decoders directory under ~ldm and copy the $GEMEXE/dc* programs
into ~ldm/decoders.

In your pqact.conf lines below, you have /decoders/dcuair and
/usr/local/ldm/decoders/dcmetr. These are likely wrong.

If you create the ~ldm/deciders directory as I mentioned above,
then the proper executable paths will be decoders/dcuair and
decoders/dcmetr. Or, you can give the full path to your
programs (but it makes for more editing of the samples I provide):
/export/home/gempack/bin/sol/dcuair 
/export/home/gempack/bin/sol/dcmetr.

Also, you do not need to but TAB characters between the 
decoder options and there values, eg, <TAB> characters separate the
arguments interpreted by pqact:

#upperair data
DDS|IDS <TAB> ^U[ABDEFGHIJKLMPQRSTXZ].... .... ([0-3][0-9])([0-2][0-9])
        <TAB> PIPE <TAB> /decoders/dcuair -b 24 -m 16
        <TAB> -d /usr/local/ldm/data/gempak/logs/dcuair.log
        <TAB> -e GEMTBL=/export/home/gempack/gempak/tables/stns
        <TAB> -s snstns.tbl
        <TAB> data/gempak/upperair/YYYYMMDD_upa.gem

For GRIB data, use the dcgrib2 example I provide in the 
web URL above:
# Global GRIB decoding action. 
# Products stored maintained in $GEMTBL/grid/gribkey.tbl
HDS     ^[HOYZ].*
        PIPE    decoders/dcgrib2 -d data/gempak/logs/dcgrib.log
        -e GEMTBL=/export/home/gempack/gempak/tables


You can use GARP, or NMAP2 as GUI interfaces to display the
data. Or, the command line programs like sfmap, snmap, etc.
The configuration files in $GEMTBL/config/datatype.tbl and
$GARPHOME/config/Garp_defaults.tbl all assume you use the
decoded file locations under ~ldm/data/gempak as shown on the
URL above. If you  use these locations, then you only
need to edit the environmental variable locations in $NAWIPS/Gemenviron
for $GEMDATA on your system.

For example, if your ~ldm account is /usr/local/ldm, and your data is being
filed under the ~ldm/data/gempak directory, then
set GEMDATA in the Gemenviron file to /usr/local/ldm/data/gempak.


The decoders that come from NCEP (like dcmetr and dcuair)
require that you create the data directory that they will write
to, so make sure ~ldm/data/gempak/upperair and
~ldm/data/gempak/surface exist.

The dcgrib2 decoder will create all the necessary directories.


Steve Chiswell
Unidata User Support




>From: <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200204252028.g3PKSEa13166

>Dear Steve:
> Thank you for your advice!
> I have settled the problem according to your advice. I am a new comer 
>to LDM and UniDATA.  I have the following questions:
>
>(1) How can I display the WMO and GRIB file using the GARP? 
>
>(2)Is GARP the most common used software in GEMPAK to display data?
>
>(3)Now I want to receive the upper air data and surface data. So I 
>wrote following in my pqact.conf file.  But I can't receive any data of 
>gem file. Can you tell me why? In addition ,Could I know which data I 
>am writing on my disk instead of "ldmadmin watch"? As you know, 
>ldmadmin watch only watch all the data I can receive , not the data I 
>wrote to my disk. I check my pqact.conf file to be syntax-correct.Thank 
>you very much.
>
> #upperair data
>DDS|IDS ^U[ABDEFGHIJKLMPQRSTXZ].... .... ([0-3][0-9])([0-2][0-9])
>        PIPE    /decoders/dcuair        -b      24      -m      16
>        -d      /usr/local/ldm/data/gempak/logs/dcuair.log
>        -e      GEMTBL=/export/home/gempack/gempak/tables/stns
>        -s      snstns.tbl
>        /usr/local/ldm/data/gempak/upperair/YYYYMMDD_upa.gem
>
>#surface data
>DDS|IDS ^S[AP].* .... ([0-3][0-9])([0-2][0-9])
>        PIPE    /usr/local/ldm/decoders/dcmetr  -b      9       -m      
>72
>        -d      /data/gempak/logs/dcmetr.log
>        -e      GEMTBL=/export/home/gempack/gempak/tables/stns
>        -s      sfmetar_sa.tbl
>        /usr/local/ldm/data/gempak/surface/YYYYMMDD_sao.gem
>
>
>Dongyu Liu
>----- Original Message -----
>From: Unidata Support <address@hidden>
>Date: Thursday, April 25, 2002 10:47 am
>Subject: 20020424: 20020424: Gempak installation! 
>
>
>