latlon_gridtype_lonlat_rot.F90

Go to the documentation of this file.

!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 latlon_gridtype_lonlat_rot(KGRID_PAR,KL,PGRID_PAR,PLAT,PLON,PMESH_SIZE,PDIR)
!     #########################################################################
!
!!****  *LATLON_GRIDTYPE_LONLAT_ROT* - routine to compute the horizontal geographic fields
!!
!!    PURPOSE
!!    -------
!!
!!**  METHOD
!!    ------
!!
!!    EXTERNAL
!!    --------
!!
!!
!!    IMPLICIT ARGUMENTS
!!    ------------------
!!
!!    REFERENCE
!!    ---------
!!
!!
!!    AUTHOR
!!    ------
!!      P. Samuelsson  SMHI
!!
!!    MODIFICATIONS
!!    -------------
!!      Original    12/2012 
!-------------------------------------------------------------------------------
!
!*       0.    DECLARATIONS
!              ------------
!
USE modd_csts,     ONLY : xpi, xradius
!
USE mode_gridtype_lonlat_rot
!RJ: missing modi
USE modi_regrot_lonlat_rot
!
!
!
USE yomhook   ,ONLY : lhook,   dr_hook
USE parkind1  ,ONLY : jprb
!
IMPLICIT NONE
!
!*       0.1   Declarations of arguments
!              -------------------------
!
INTEGER,                    INTENT(IN)  :: kgrid_par  ! size of PGRID_PAR
INTEGER,                    INTENT(IN)  :: kl         ! number of points
REAL, DIMENSION(KGRID_PAR), INTENT(IN)  :: pgrid_par  ! parameters defining this grid
REAL, DIMENSION(KL),        INTENT(OUT) :: plat       ! latitude  (degrees)
REAL, DIMENSION(KL),        INTENT(OUT) :: plon       ! longitude (degrees)
REAL, DIMENSION(KL),        INTENT(OUT) :: pmesh_size ! mesh size (m2)
REAL, DIMENSION(KL),        INTENT(OUT) :: pdir ! direction of main grid Y axis (deg. from N, clockwise)
!
!*       0.2   Declarations of local variables
!              -------------------------------
!
REAL    :: zwest   ! West longitude in rotated grid (degrees)
REAL    :: zsouth  ! South latitude in rotated grid  (degrees)
REAL    :: zdlon   ! Longitudal grid spacing  (degrees)
REAL    :: zdlat   ! Latitudal grid spacing  (degrees)
REAL    :: zpolon  ! Longitude of rotated pole (degrees)
REAL    :: zpolat  ! Latitude of rotated pole  (degrees)
INTEGER :: ilon    ! number of points in longitude
INTEGER :: ilat    ! number of points in latitude
!
REAL, DIMENSION(KL) :: zlon, zlat     ! rotated longitude, latitude
INTEGER :: jlon, jlat, jl
!
REAL(KIND=JPRB) :: zhook_handle
!---------------------------------------------------------------------------
!
!*       1.    Grid parameters
!              ---------------
!
IF (lhook) CALL dr_hook('LATLON_GRIDTYPE_LONLAT_ROT',0,zhook_handle)
!
 CALL get_gridtype_lonlat_rot(pgrid_par,                                 &
                               zwest,zsouth,zdlon,zdlat,zpolon,zpolat,  &
                               ilon,ilat,plon=plon,plat=plat            )  
!
!-----------------------------------------------------------------------------
!
!*       2.    Compute grid size
!              -----------------
!
 CALL regrot_lonlat_rot(plon,plat,zlon,zlat,    &
                             kl,1,kl,1,        &
                             zpolon,zpolat,1   )  
!
pmesh_size(:) = ( xpi * xradius /180. )**2 * zdlat * zdlon * cos(zlat(:)*xpi/180.)
!
!-----------------------------------------------------------------------------
!
!*       4.    Direction of of grid from North for each grid point
!              ---------------------------------------------------
!
pdir(:) = 0.
IF (lhook) CALL dr_hook('LATLON_GRIDTYPE_LONLAT_ROT',1,zhook_handle)
!
!---------------------------------------------------------------------------
!
END SUBROUTINE latlon_gridtype_lonlat_rot