!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer
!version 3 or (at your option) any later version that should be found at:
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html
!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
!See the above mentioned License/Disclaimer for more details.
!You should have received a copy of the License/Disclaimer along with this software;
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec),
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
!

      SUBROUTINE GDSPA 2,2
#if defined (DOC)
*
C**s/r GDSPA  - Adjoint of spectral transform
*
*
*Author  : P.Gauthier/P.Koclas  - *ARMA and CMC  Nov 1997
*     .                      Complete rewriting of the transform for a parallel treatment
*     .                      based on having the outer loop on the zonal wavenumber
*
*     Purpose: builds the grid point model state from the spectral
*              state.
*       revision 001:
*          P. Koclas Apr 2003 
*           -removed commulti
*
*Arguments
*
** Method: The adjoint calculation is done by latitude bands and the
*          result is put in comgd0.cdk
*
#endif
      IMPLICIT NONE
*implicits
#include "pardim.cdk"
#include "comdim.cdk"
#include "comgem.cdk"
#include "comleg.cdk"
#include "comgd0.cdk"
*
C
      INTEGER  JGL, JK, JLON, ILONMAX
      REAL*8 ZCONV
C
C
C*    1. Inverse Legendre transform
C        --------------------------
 200  CONTINUE
      CALL GDSPAPAR
C
C     2.1 Reset to zero the modes that are not part of the truncation
C         -----------------------------------------------------------
C
      ILONMAX = NIEND
      DO JGL = 1, NJ
         DO JLON = 2*(NTRUNC+1)+1, ILONMAX
            DO  JK = 1, NKGDIM
               GD(JLON,JK,JGL) = 0.
            END DO
         END DO
      END DO
C
      DO JGL =1,NJ
         DO JK = 1, NKGDIM
            GD(0,JK,JGL) = 0.
         END DO
      END DO
C
C     2.2 Apply the FFT 
C         -------------
C
      CALL FFT3DVAR(GD,NIBEG,NIEND,NKGDIM,NJBEG,NJEND,NKSDIM,+1)
C
C     3. Renormalize the dual winds
C
      DO JGL = 1, NJ
         ZCONV = R1MUI(JGL)
         ILONMAX = NILON(JGL)
         DO JK = 1, 2*NFLEV
            DO JLON = 1, ILONMAX
               GD(JLON,JK,JGL) = GD(JLON,JK,JGL)*ZCONV
            END DO
         END DO
      END DO
C
      RETURN
      END