Lighning Displays

The lightning images were generated using NLDN data and SFMAP. Each color represents lightning strikes observed during a single hour. The ldmbridge decoder DCNLDN stores lightning data in surface format data files. SFLIST and SFMAP are used to list and display lightning data files.

#!/bin/csh -f


@ START_COLOR = 30
@ STOP_HOUR = 23

@ HOUR = 0
@ COUNT = 0
@ COLOR = $START_COLOR
while($HOUR <= $STOP_HOUR)
   if($COUNT == 0) then
      set CLEAR='y'
      set MAP=1
   else
      set CLEAR='n'
      set MAP=0
   endif
   if($HOUR < 10) then
      set SFFILE=9510230${HOUR}.gem
   else
      set SFFILE=951023${HOUR}.gem
   endif 
   sfmap << EOF
   sfparm = 
   proj = nps
   garea = ia
   clear = $CLEAR
   dev = gf|lightning_plot.gif
   text = 1.2/23/1/hw
   title = ${MAP}/-2/Lightning Strikes Oct 23, 1995
   map = $MAP
   panel = .02;.02;.97;.97/1/1/4
   sffile = $SFFILE
   marker = ${COLOR}/2/.1/4/hw
   r
   
   e
EOF

   @ HOUR = $HOUR + 1
   @ COLOR = $COLOR - 1
   if($COLOR == 0) then
      set COLOR=$START_COLOR
   endif
   @ COUNT = $COUNT + 1
end

exit(0)