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20040323: GPNEXR2 & NEXR2RHI



Yoong-Goog,

When receiving the Level II data from the LDM, you can use the
dcnexr2 program from your pqact.conf to decode the data into
data files that use the same name template as is specified in
$GEMTBL/config/datatype.tbl.

The example I provide in $NAWIPS/ldm/etc/templates/pqact.gempak_craft
for dcnexr2 looks like:
CRAFT   
^L2-BZIP2/(....)/([0-9][0-9][0-9][0-9][0-1][0-9][0-3][0-9])([0-2][0-9][0-5][0-9])([0-9][0-9])
        PIPE    decoders/dcnexr2 -s \1 -d /dev/null 
data/gempak/craft/\1/\1_\2_\3

This will create a directory tree under your ~ldm/data/gempak with files named 
like:
craft/KFTG/KFTG_20040323_1755. 
You can change the file loutput location, so long as your datatype.tbl file
matches the same file naming.

The $GEMTBL/config/datatype.tbl file has a template for NEXRII as:
NEXRII       $RAD/craft/%SITE%         %SITE%_YYYYMMDD_HHNN  .......etc.....

The environmental variable $RAD would point to your ~ldm/data/gempak directory.
The %SITE% template will match the station ID, eg KFTG, KCYS, etc.

In GPNEXR2, the parameter RADFIL is used to specify the radar file,
or a template in datatype.tbl. To use the template NEXRII from datatype.tbl,
set RADFIL=NEXRII|KFTG.

The RADTIM parameter will be used to provide the time used to
find the matching YYYYMMDD_HHNN portion of the file name.

Use PROJ=rad for radar data, and RADPARM is either dz, vr, or sw.
The parameter TILT is the radar tilt/sweep number you wish to view.

In NEXR2RHI, the parameter CXSTNS provides the cross section axis,
either as lat/lon points, or row/column numbers in the radar display.
INTERP controls whether to interpolate the contours between the scan
levels.

Steve Chiswell
Unidata User Support


>From: ygcho <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200403232245.i2NMjIrV000095

>Hi,
>
>I am from Colorado State University and interested in displaying CRAFT LEVEL 2
>  
>data.
>The LDM program has been installed and its functionality has been confirmed, 
>such as receiving data and storing the data after decoding using DCNEXR2.
>
>I would really appreciate it if I can get some tips how to display the level 2
>  
>data using command line programs, such as GPNEXR2 & NEXR2RHI.
>Some related webpage information would be also greatly helpful.
>Thanks.
>
>Regards,
>
>Yoong-Goog Cho
>
>
>---------------------------------------------
>Yoong-Goog Cho, Ph.D. 
>Radar and Communication Lab.
>Dept. of Electrical and Computer Engineering   
>Colorado State University
>(Phone) 970-491-6758   (Fax) 970-491-2249
>---------------------------------------------
>
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