;****************************************************************************
; Author  :  Josh Grant, COAPS
;
; Description : This program is used to calculate the divergence from a gridded
;               dataset.  In this case it is reading a NSCAT data that has been
;               already gridded and will then be output to a file.  This is
;               also only computed divergence for the monthly NSCAT dataset.
;
; **Warning** : Due to poor planning on my part and lack of time the bulk of
;               this program is not commented like it should be.
;****************************************************************************

@calc_grid_div.pro

base = "/Net/NSCAT/people/grant/diverg_proj/"
dataDirectory = base + "grid2div/data/winds/monthly/"
saveDirectory = base + "grid2div/data/diverg/monthly/"

stringFormat = STRCOMPRESS( '(i' + STRING( 2 ) + '.' $
               + STRING( 2 ) + ')', /REMOVE_ALL )

delta = 2.0
miss = 99999.0
u = FLTARR( 360, 180 )
v = FLTARR( 360, 180 )
diverg = FLTARR( 360, 180 )

start = 9
endday = 12
FOR year = 1996, 1997 DO BEGIN
  IF ( year EQ 1997 ) THEN BEGIN
    start = 1
    endday = 7
  ENDIF
  FOR number = start, endday DO BEGIN

    file_name = dataDirectory + STRTRIM( year, 1 ) + $
      STRING( number, format = stringFormat ) + '.monavg'

    READ_NSCAT_GRID, file_name, u, v, error
    IF ( error EQ 0 ) THEN BEGIN
      CALC_GRID_DIV, u, v, delta, miss, diverg
      
      file_name = saveDirectory + STRTRIM( year, 1 ) + $
        STRING( number, format = stringFormat ) + ".mondiv"
      
      WRITE_GRID_DIV, file_name, diverg
    ENDIF
  ENDFOR
ENDFOR

END