hor_interpol_latlon.F90

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!SFX_LIC Copyright 1994-2014 CNRS, Meteo-France and Universite Paul Sabatier
!SFX_LIC This is part of the SURFEX software governed by the CeCILL-C licence
!SFX_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt  
!SFX_LIC for details. version 1.
!     #########
SUBROUTINE hor_interpol_latlon(KLUOUT,PFIELDIN,PFIELDOUT)
!     #################################################################################
!
!!****  *HOR_INTERPOL_LATLON* - Interpolation from a lat/lon regular grid
!!
!!    PURPOSE
!!    -------
!
!!**  METHOD
!!    ------
!!
!!    REFERENCE
!!    ---------
!!      
!!
!!    AUTHOR
!!    ------
!!     C. Lebeaupin Brossier 
!!
!!    MODIFICATIONS
!!    -------------
!!      Original    01/2004
!!     B. Decharme  07/2014 use usual HORIBL_SURF for regular lat/lon grid
!!                         (ADAPT_HORIBL_SURF is not up to date and is wrong
!!                          for interpolation from a coarse grid to a finer)
!!  
!!------------------------------------------------------------------
!
!
!
USE modd_surfex_mpi, ONLY : nrank, npio
USE modd_horibl, ONLY : lgloblon, lglobs, lglobn, xilo1h, xilo2h, ninloh, &
                        xla, xola, xolo, np, xloph
USE modd_prep,             ONLY : xlat_out, xlon_out, linterp
USE modd_grid_latlonregul, ONLY : xilat1, xilon1, xilat2, xilon2,    &
                                  ninlat, ninlon, nilength,xilatarray  
USE modd_surf_par,   ONLY : xundef
!
USE modi_horibl_surf_gridin
USE modi_horibl_surf_value
USE modi_horibl_surf_extrap
!
USE yomhook   ,ONLY : lhook,   dr_hook
USE parkind1  ,ONLY : jprb
!
IMPLICIT NONE
!
!*      0.1    declarations of arguments
!
INTEGER,              INTENT(IN)    :: KLUOUT    ! logical unit of output listing
REAL, DIMENSION(:,:), INTENT(IN)    :: PFIELDIN  ! field to interpolate horizontally
REAL, DIMENSION(:,:), INTENT(OUT)   :: PFIELDOUT ! interpolated field
!
!*      0.2    declarations of local variables
!
REAL, DIMENSION(:,:), POINTER :: ZFIELDIN0
REAL, DIMENSION(:,:,:), ALLOCATABLE :: ZFIELDIN    
!
INTEGER, DIMENSION(:,:,:), ALLOCATABLE :: ILSMIN  
INTEGER, DIMENSION(:,:), ALLOCATABLE :: IMASKIN  ! input mask
INTEGER, DIMENSION(:), ALLOCATABLE :: IMASKOUT ! output mask
INTEGER, DIMENSION(:), POINTER :: IMASK=>null()
INTEGER, DIMENSION(SIZE(NP,1),SIZE(NP,2)) :: IP
INTEGER                            :: INO, INL     ! output number of points
INTEGER                            :: JL, JI       ! loop counter
!
REAL(KIND=JPRB) :: ZHOOK_HANDLE
!
!-------------------------------------------------------------------------------------
!*      1.    Allocations
!
IF (lhook) CALL dr_hook('HOR_INTERPOL_LATLON',0,zhook_handle)
!
ino = SIZE(xlat_out)
inl = SIZE(pfieldout,2)
!
ALLOCATE(imaskout(ino))
imaskout = 1
!
ALLOCATE(imaskin(nilength,inl))
!
IF (nrank==npio) THEN
  imaskin(:,:) = 1.
  WHERE(pfieldin(:,:)==xundef) imaskin(:,:) = 0.
ENDIF
!
ALLOCATE(zfieldin(ino,inl,12))
ALLOCATE(ilsmin(ino,inl,12))
!
!
 CALL horibl_surf_gridin(ninlat,ninlon,nilength,pfieldin(:,:),ino, &
                        .false.,kluout,lglobs,lglobn,lgloblon,np, &
                        zfieldin0,zfieldin,ilsmin,imaskin,imaskout,imask)
!
DO jl=1,SIZE(np,2)
  DO ji = 1,SIZE(np,1)
    ip(ji,jl) = imask(np(ji,jl))
  ENDDO
ENDDO
!
!*      3. Interpolation with horibl
!
DO jl=1,inl
!
  CALL horibl_surf_value(nilength,ino,pfieldout(:,jl),linterp,zfieldin(:,jl,:),&
                         ilsmin(:,jl,:),xolo,xola,xla,xloph,imaskin(:,jl),imaskout)
!
ENDDO
!
  CALL horibl_surf_extrap(xilat1,xilo1h,xilat2,xilo2h,ninlat,ninlon,nilength,&
                          pfieldin,ino,ip,xlon_out,xlat_out,&
                          pfieldout,kluout,linterp,xilatarray)
!
!*      6.    Deallocations
!
imask => null()
DEALLOCATE(imaskin )
DEALLOCATE(imaskout)
DEALLOCATE(zfieldin)
DEALLOCATE(zfieldin0)
DEALLOCATE(ilsmin)
!
IF (lhook) CALL dr_hook('HOR_INTERPOL_LATLON',1,zhook_handle)
!-------------------------------------------------------------------------------
END SUBROUTINE hor_interpol_latlon