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!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
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***s/r v4d_interp_ad - ADJ of v4d_interp  
*
#include "model_macros_f.h"
*

      subroutine v4d_interp_ad (zo,px,py,npts,zi,ax,ay,cx,cy,i1,i2,j1,j2,nk, 3,6
     %                          jmin,jmax,ni,grtypi,degree)
*
#include "impnone.cdk"
*
      integer npts,i1,i2,j1,j2,nk,jmin,jmax,ni,degree
*
      real zo(nk,npts),zi(i1:i2,j1:j2,nk),
     %     px(npts),py(npts),ax(i1:i2),ay(j1:j2),cx(i1:i2,6),cy(j1:j2,6)
*
      character*1 grtypi
*
*author Tanguay M.
*
*revision
* v3_00 - Tanguay M.        - initial MPI version
*
*object
*  see id section
*
*Adjoint of
*arguments
* Name         I/O        Description
*----------------------------------------------------------------
* zo            O         Interpolated scalar field at positions px,py
* px            I         Position x in INPUT grid
* py            I         Position y in INPUT grid
* npts          I         Number of positions in zo
* zi            I         Scalar field on INPUT grid
* ax            I         X axe of INPUT grid
* ay            I         Y axe of INPUT grid
* cx            I         AX difference on INPUT grid
* cy            I         AY difference on INPUT grid
* i1-i2         I         Dimension x in INPUT grid
* j1-j2         I         Dimension y in INPUT grid
* nk            I         Dimension z in INPUT grid
* jmin          I         Lower  limit j
* jmax          I         Higher limit j
* ni            I         Period if grid='G', Heart if grid = 'Z'
* grtypi        I         Type of INPUT grid
* degree        I         Degree of interpolation
*----------------------------------------------------------------
*
*     ___________________________________________________________________________
*
      if(degree.ne.1  .and.degree.ne.3  ) call gefstop('v4d_interp_ad')
      if(grtypi.ne.'G'.and.grtypi.ne.'Z') call gefstop('v4d_interp_ad')
*     ___________________________________________________________________________
*
*         Adjoint of
*         case LINEAR
*         -----------
          if(degree.eq.1) then
*
             if(grtypi.eq.'Z') call v4d_irgdint_1_nw_ad (zo,px,py,npts,ax,ay,zi,
     %                                                   i1,i2,j1,j2,nk,jmin,jmax)
*
             if(grtypi.eq.'G') call v4d_irgdint_1_w_ad  (zo,px,py,npts,ax,ay,zi,
     %                                                   ni,j1,j2,nk)
*
*         Adjoint of
*         case CUBIC
*         ----------
          elseif(degree.eq.3) then
*
             if(grtypi.eq.'Z') call v4d_irgdint_3_nw_ad (zo,px,py,npts,ax,ay,cx,cy,zi,
     %                                                   i1,i2,j1,j2,nk,jmin,jmax)
*
             if(grtypi.eq.'G') call v4d_irgdint_3_w_ad  (zo,px,py,npts,ax,ay,cx,cy,zi,
     %                                                   ni,j1,j2,nk)
*
          endif
*
      return
      end