[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20031102: Still looking for a NLDN GIF script example

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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: 20031102: Still looking for a NLDN GIF script example
  • Date: 03 Nov 2003 15:01:24 -0700
Chris,

I have an example of a GEMPAK  NLDN script posted here:
http://my.unidata.ucar.edu/content/software/gempak/examples/lightning/lightning.html

I also have a sample of a script in the GEMPAK tutorial:
http://my.unidata.ucar.edu/content/software/gempak/tutorial/exam.html

And, one more example using the $GEMTBL/config/prmlst.tbl product
entry of "points" or "stid" to define a marker or +/- character 
respectively for the NLDN file alias and the SFCTIME program I provided
to list the available times in a surface file which can be used
to create output file names and TITLE lines with time string info such
as:


#!/bin/csh -f

source ~gempak/Gemenviron

# NLDN environmental variable set in Gemenviron
# data files stored in 30 minute files names YYYYMMDDHHNN_nldn.gem
# as provided in $NAWIPS/ldm/etc/templates/pqact.gempak_decoders.in
cd $NLDN
set FILES=`ls *_nldn.gem | tail -4`

# create a uniqueue working directory for gif file output
set WORKDIR=/tmp/nldn.$$
mkdir -p $WORKDIR
cd $WORKDIR

foreach FILE ($FILES)
   # loop for each of most recent data files
   
   set TIMES=`sfctime $NLDN/$FILE | grep -v '\['`
   foreach TIME ($TIMES)
      # run sfmap for each time in the data file
      # nldn data typically stored in 5 minute bins per dcnldn

      set YMDHN=`echo $TIME | cut -c1-6,8-11`
      set OUTFILE="nldn_${YMDHN}.gif"

      sfmap << EOF
          AREA     = dset
          GAREA    = uslcc
          SATFIL   =  
          RADFIL   =  
          SFPARM   = points
          DATTIM   = $TIME
          SFFILE   = nldn|${TIME}
          COLORS   =  
          MAP      = 6
          LATLON   = 0
          TITLE    = 6
          CLEAR    = y
          PANEL    = 0
          DEVICE   = gif|${OUTFILE}|900;700
          PROJ     = def
          FILTER   = 
          TEXT     = 
          LUTFIL   = 
          STNPLT   =  
          CLRBAR   =  
          IMBAR    = 
          run

          exit
EOF
      gpend
   end
end


# do something with our gif files, such as create an animaged gif
# using the Imagemagick program called convert, pause after last image

set LAST=`ls nldn_*.gif | tail -1`
convert -loop 0 -delay 20 nldn_*.gif -delay 300 $LAST /tmp/loop_nldn.gif
cd /tmp
rm -rf $WORKDIR



Steve Chiswell
Unidata User Support



On Sat, 2003-11-01 at 20:18, Chris Novy wrote:
> I'm still looking for a sample script I can reverse-engineer to produce GIF 
> images (non-XW) from NLDN files.  Does anyone have an example I can look 
> at?  I'm decoding the NLDN data into.gem files but still can't process them.
> 
> Thanks.
> 
> ..Chris..
>