◆ vg6d_c2a()

subroutine, public vg6d_c2a ( type(volgrid6d), dimension(:), intent(inout) this )

Convert grids type C to type A.

Use this to interpolate data from grid type C to grid type A Grids type are defined by Arakawa.

We need to find these types of area in a vg6d array T area of points with temterature etc. U area of points with u components of winds V area of points with v components of winds

this method works if it finds two volumes: 1) volume U and volume V: compute H and traslate on it 2) volume U/V and volume H : translate U/V on H three volumes: translate U and V on H

try to work well on more datasets at once

Parametri

[in,out] this vettor of volumes volgrid6d to elaborate

Definizione alla linea 3194 del file volgrid6d_class.F90.

! improve grid definition precision
    CALL griddim_setsteps(this%griddim)
    
  case (2)
 
#ifdef DEBUG
    call l4f_category_log(this%category,l4f_debug,"C grid: V points, we need interpolation")
#endif
 
    call get_val(this%griddim, ymin=ymin, ymax=ymax)
    step_lat=(ymax-ymin)/dble(this%griddim%dim%ny-1)
    ymin=ymin-step_lat/2.d0
    ymax=ymax-step_lat/2.d0
    call set_val(this%griddim, ymin=ymin, ymax=ymax)
! improve grid definition precision
    CALL griddim_setsteps(this%griddim)
    
  case default
 
    call l4f_category_log(this%category,l4f_fatal,"C grid type not known")
    call raise_fatal_error ()
 
  end select
 
end if
 
 
call griddim_unproj(this%griddim)
 
 
end subroutine vg6d_c2a_grid
 
! Convert C grid to A grid
subroutine vg6d_c2a_mat(this,cgrid)
 
type(volgrid6d),intent(inout) :: this ! object containing fields to be translated
integer,intent(in) :: cgrid ! in C grid (Arakawa) we have 0=T,1=U,2=V points
 
INTEGER :: i, j, k, iv, stallo
REAL,ALLOCATABLE :: tmp_arr(:,:)
REAL,POINTER :: voldatiuv(:,:)
 
 
IF (cgrid == 0) RETURN ! nothing to do
IF (cgrid /= 1 .AND. cgrid /= 2) THEN ! wrong cgrid
  CALL l4f_category_log(this%category,l4f_fatal,"C grid type "// &
   trim(to_char(cgrid))//" not known")
  CALL raise_error()
  RETURN
ENDIF
 
! Temporary workspace
ALLOCATE(tmp_arr(this%griddim%dim%nx, this%griddim%dim%ny),stat=stallo)
if (stallo /=0)then
  call l4f_log(l4f_fatal,"allocating memory")
  call raise_fatal_error()
end if
 
! allocate once for speed
IF (.NOT.ASSOCIATED(this%voldati)) THEN
  ALLOCATE(voldatiuv(this%griddim%dim%nx, this%griddim%dim%ny), stat=stallo)
  IF (stallo /= 0) THEN
    CALL l4f_log(l4f_fatal,"allocating memory")
    CALL raise_fatal_error()
  ENDIF
ENDIF
 
IF (cgrid == 1) THEN ! U points to H points
  DO iv = 1, SIZE(this%var)
    DO k = 1, SIZE(this%timerange)
      DO j = 1, SIZE(this%time)
        DO i = 1, SIZE(this%level)
          tmp_arr(:,:) = rmiss
          CALL volgrid_get_vol_2d(this, i, j, k, iv, voldatiuv)
 
! West boundary extrapolation
          WHERE(voldatiuv(1,:) /= rmiss .AND. voldatiuv(2,:) /= rmiss)
            tmp_arr(1,:) = voldatiuv(1,:) - (voldatiuv(2,:) - voldatiuv(1,:)) / 2.
          END WHERE
 
! Rest of the field
          WHERE(voldatiuv(1:this%griddim%dim%nx-1,:) /= rmiss .AND. &
           voldatiuv(2:this%griddim%dim%nx,:) /= rmiss)
            tmp_arr(2:this%griddim%dim%nx,:) = &
             (voldatiuv(1:this%griddim%dim%nx-1,:) + &
             voldatiuv(2:this%griddim%dim%nx,:)) / 2.
          END WHERE
 
          voldatiuv(:,:) = tmp_arr
          CALL volgrid_set_vol_2d(this, i, j, k, iv, voldatiuv)
        ENDDO
      ENDDO
    ENDDO
  ENDDO
 
ELSE IF (cgrid == 2) THEN ! V points to H points
  DO iv = 1, SIZE(this%var)
    DO k = 1, SIZE(this%timerange)
      DO j = 1, SIZE(this%time)
        DO i = 1, SIZE(this%level)
          tmp_arr(:,:) = rmiss
          CALL volgrid_get_vol_2d(this, i, j, k, iv, voldatiuv)
 
! South boundary extrapolation
          WHERE(voldatiuv(:,1) /= rmiss .AND. voldatiuv(:,2) /= rmiss)
            tmp_arr(:,1) = voldatiuv(:,1) - (voldatiuv(:,2) - voldatiuv(:,1)) / 2.
          END WHERE
 
! Rest of the field
          WHERE(voldatiuv(:,1:this%griddim%dim%ny-1) /= rmiss .AND. &
           voldatiuv(:,2:this%griddim%dim%ny) /= rmiss)
            tmp_arr(:,2:this%griddim%dim%ny) = &
             (voldatiuv(:,1:this%griddim%dim%ny-1) + &
             voldatiuv(:,2:this%griddim%dim%ny)) / 2.
          END WHERE
 
          voldatiuv(:,:) = tmp_arr
          CALL volgrid_set_vol_2d(this, i, j, k, iv, voldatiuv)
        ENDDO
      ENDDO
    ENDDO
  ENDDO
ENDIF ! tertium non datur
 