Strange problem using FORTRAN code in NCL

From: eddycarl <eddycarl_at_nyahnyahspammersnyahnyah>
Date: Sun, 4 Oct 2009 00:12:55 +0800 (CST)

Hi there,
I have a problem using a FORTRAN 77 code to read ASCII data into NCL to plot. The data I try to read is TOMS OMI aerosol index and the FORTRAN 77 code is provided at TOMS ftp site. I followed the steps in to write special wrapper text, run WRAPIT and load the shared object and call the routine. This seems to be good. But when I run my NCL script, it didn't show ANY result (However, it is supposed to print the information of the the data (for the "print(var)" command) which is read in, and a plot). NO error information is shown, either. When I add a "write" statement in the fortran code (as you can find in my f code), the data can be shown on the commandline when I run NCL. But still, there is NO result from NCL. I think this indicated that the f subrountine can be called by NCL, but there is some problem in transfering data array into NCL. I am wondering if anyone can help to solve this problem? Thanks!
BW: I used NCL Version 5.1.1 on Linux X86_64 platform. I have tested the ex.f and ex.ncl at WRAPIT webpage. And it can be run successfully.

The fortran code to read the data: (This code is OK to run separately. And it needs a string as filename input)
c this program reads the daily gridded data for real-time OMI
c data for January 31, 2007. variables lat and lon contain the
c latitudes and longitudes of the center of each of the grid
c cells in the array AI.

      subroutine read_aersl_omi(fname,lat,lon,ai)
      character*80 header
      integer*4 ai
      real*4 lat(180), lon(360)
      character*(*) fname
      dimension ai(360,180)

c calculate latitudes and longitudes
      dlat = 1.0
      do 10 i=1,180
      lat(i) = -89.5 + (i-1)*dlat
10 continue
      dlon = 1.0
      do 20 i=1,360
      lon(i) = -179.5 + (i-1)*dlon
20 continue
c open the input file
cc open(1,file='L3_aersl_omi_20051231.txt',status='old')
c read in the header lines
      read(1,'(a80)') header
      read(1,'(a80)') header
      read(1,'(a80)') header
c read in the data into the array ozone
      do 30 i=1,180
      read(1,'(1x,25i3)') (ai(j,i),j=1,360)
30 continue
c close the input file
c process/print the ai data
c write(*,*) ai

Part of the NCL code I used:
; read multiple files
    load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
    load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
    load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
   external OMI "./" ; fortran shared object produced by WRAPIT
       fname = "L3_aersl_omi_20051230.txt"
       lat = new(180,float)
       lon = new(360,float)
       var = new((/180,360/),float)

; ... ... following codes to plot the data

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Received on Sat Oct 03 2009 - 10:12:55 MDT

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