latlonmask_cartesian.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 latlonmask_cartesian(KGRID_PAR,PGRID_PAR,OLATLONMASK)
!     ##################################
!
!!**** *LATLONMASK* builds the latiude and longitude mask including the grid
!!
!!    PURPOSE
!!    -------
!!
!!    METHOD
!!    ------
!!
!!    Two tests are performed:
!!
!!   1) test if the points of the mask are in the domain
!!
!!   2) fills the mask points corresponding to points scanning
!!   
!!    EXTERNAL
!!    --------
!!
!!
!!    IMPLICIT ARGUMENTS
!!    ------------------
!!
!!
!!    REFERENCE
!!    ---------
!!
!!    AUTHOR
!!    ------
!!
!!      V. Masson       Meteo-France
!!
!!    MODIFICATION
!!    ------------
!!      
!!      Original        19/07/95
!----------------------------------------------------------------------------
!
!*    0.     DECLARATION
!            -----------
!
USE mode_gridtype_cartesian
!
!
USE yomhook   ,ONLY : lhook,   dr_hook
USE parkind1  ,ONLY : jprb
!
IMPLICIT NONE
!
!*    0.1    Declaration of arguments
!            ------------------------
!
INTEGER,                       INTENT(IN)  :: KGRID_PAR   ! size of PGRID_PAR
REAL,    DIMENSION(KGRID_PAR), INTENT(IN)  :: PGRID_PAR   ! parameters defining this grid
LOGICAL, DIMENSION(720,360),   INTENT(OUT) :: OLATLONMASK ! mask where data are to be read
!
!*    0.2    Declaration of local variables
!            ------------------------------
!
INTEGER                           :: JLON,JLAT! loop counters
REAL, DIMENSION(720,360)          :: ZLON_MASK! mask points longitudes
REAL, DIMENSION(720,360)          :: ZLAT_MASK! mask points latitudes
REAL                              :: ZLAT0    ! reference latitude
REAL                              :: ZLON0    ! reference longitude
REAL(KIND=JPRB) :: ZHOOK_HANDLE
!----------------------------------------------------------------------------
!
IF (lhook) CALL dr_hook('LATLONMASK_CARTESIAN',0,zhook_handle)
 CALL get_gridtype_cartesian(pgrid_par,zlat0,zlon0)
!
!-------------------------------------------------------------------------------
!
olatlonmask(:,:) = .false.
!
!-------------------------------------------------------------------------------
!
!*      2.   Definition of the coordinates at center of the mask meshes
!            ----------------------------------------------------------
!
!
zlon_mask(:,:)= spread( (/ (  jlon     /2. - 0.25 , jlon=1,720 ) /) , dim=2, ncopies=360 )
zlat_mask(:,:)= spread( (/ ( (jlat-180)/2. - 0.25 , jlat=1,360 ) /) , dim=1, ncopies=720 )
!
!*      3.   Longitude correction / LON0
!            ---------------------------
!
zlon_mask(:,:)=zlon_mask(:,:)+nint((zlon0-zlon_mask(:,:))/360.)*360.
!
!
WHERE (        zlon_mask(:,:) -0.25 <= zlon0 .AND. zlon0 <= zlon_mask(:,:) +0.25 &
           .AND. zlat_mask(:,:) -0.25 <= zlon0 .AND. zlat0 <= zlat_mask(:,:) +0.25 )  
  olatlonmask(:,:) = .true.
END WHERE
IF (lhook) CALL dr_hook('LATLONMASK_CARTESIAN',1,zhook_handle)
!
!-------------------------------------------------------------------------------
!
END SUBROUTINE latlonmask_cartesian