*
***S/R CALGZ - CALCUL PROFILS DE GZ SUR NIVEAUX MODELES
*

      SUBROUTINE CALGZ(PX,VT,GZ,PTOPO,NISIG,NJSIG,NLSIG,LEVS) 3
*

      IMPLICIT NONE

*COMDECK MAXPARM
*
      INTEGER ITEMS,ITEMS3,ITEMS4,ITEMS6,MAXIDTP,MAXLEV
      INTEGER ITEMS2,NMAJ,NWSECT,MAXREGI,MAXREP,MAXNEIG,MAXCPU,MAXSIG
      INTEGER MAXPRED,MAXSTN,NPM
      PARAMETER (ITEMS=5,  ITEMS4=4, ITEMS6=6, ITEMS2=2,ITEMS3=3)
      PARAMETER (MAXLEV=16, NMAJ=32, NWSECT=512, MAXREGI=17)
      PARAMETER (MAXREP=40, MAXNEIG=1001, MAXCPU=4)
      PARAMETER (MAXPRED=1501,MAXSTN=50000,MAXIDTP=47)
*


*
      INTEGER NISIG,NJSIG,NLSIG
      INTEGER LEVS(NLSIG)
      REAL*8    PX(NISIG*NJSIG,NLSIG),GZ(NISIG*NJSIG,NLSIG)
      REAL*8    VT(NISIG*NJSIG,NLSIG)
      REAL*8    PTOPO(NISIG*NJSIG)

*
*AUTHOR   - J. MORNEAU
*
* Revision
*         S. Pellerin *ARMA/SMC
*                 . Introduction of automatic arrays to avoid limit of 50
*                   levels
*         S. Pellerin, ARMA, August 2008
*                 . Optimization, introduction of MATAPATST2 and VTAPST2
*LANGUAGE - FORTRAN

*
*LIBRAIRIES
*  - RPN SOURCE RCS  /users/dor/arma/ccc/oi3d                   (pollux)
*  - OBJET  LB   /home/3rarm/arma/ccc/oilib/liboa64multi_r6.2.a   (sx3r)
*  - ABSOLUS REP /home/3rarm/arma/ccc/oilib/abs_liboa64multi_r6.2 (sx3r)
*  - OBJET  LB   /data/rpn02/ccc/ao_lib/liboa64_r6.2.a            (sx3)
*  - ABSOLUS REP /data/rpn02/ccc/ao_lib/abs_liboa64_r6.2          (sx3)
          CHARACTER *(*) VERSION
          PARAMETER ( VERSION = 'OASRT10N' )
*
*ARGUMENTS-
*    E    - PX      - "ANALYSED" PRESSURE ON MODEL LEVELS
*    E    - NISIG,
*    E    - NJSIG   - RESOLUTION OF THE MODEL FIELDS GRID
*    E    - NLSIG   - NUMBER OF MODEL LEVELS
*    E    - LEVS    - MODEL LEVELS IN STANDARD FILES IP1 FORMAT
*    E    - PTOPO    - Topography
*
*MODULES  -
            EXTERNAL MATAPATST,VTAPST
**
*------------------------------------------------------------------------
*
      INTEGER I,N,NP
      REAL*8    MGOVRR
      REAL*8    ALPHA,S(NISIG*NJSIG,NLSIG),PR(NISIG*NJSIG,NLSIG)
      REAL*8    VMA(NISIG*NJSIG,NLSIG),VMB(NISIG*NJSIG,NLSIG),VMC(NISIG
     &     *NJSIG,NLSIG)
      REAL*8    VMD(NISIG*NJSIG,NLSIG),VME(NISIG*NJSIG,NLSIG),VMF(NISIG
     &     *NJSIG,NLSIG)
      REAL*8    PCON

      REAL*8       GRAV, RGAS
      PARAMETER (GRAV=9.80616, RGAS=287.04)
      REAL*8    T0
      DATA T0 /273.16/
*
      MGOVRR = -1.*GRAV/RGAS
      PCON  = 1.0/(10.0*MGOVRR)
      NP     = NISIG*NJSIG

*
*_____ATTENTION: LEVS(I) INCREASES WITH I
*
*_____CALCUL DE GZ AVEC LA ROUTINE VTAPST
*
      ALPHA = -1.

      DO N=1,NP
        DO I=1,NLSIG
          PR(N,I) = VT(N,I) + T0
          S(N,I)  = PX(N,I)*100.0
        ENDDO
        GZ(N,NLSIG) = PTOPO(N)  
      enddo
*
      CALL MATAPATST2(S,ALPHA,NP,NLSIG,VMA,VMB,VMC,VMD,VME,VMF)

      CALL VTAPST2(GZ,PR,PCON,NLSIG,NP,VMA,VMB,VMC)

      RETURN
      END