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!MNH_LIC Copyright 1994-2019 CNRS, Meteo-France and Universite Paul Sabatier
!MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
!MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
!MNH_LIC for details. version 1.
!-----------------------------------------------------------------
SUBROUTINE COMPRESS_FIELD(XTAB,KX,KY,KNBTOT,KNBUSE)
USE MODD_COMPPAR
USE MODE_SEARCHGRP
USE,INTRINSIC :: IEEE_ARITHMETIC
IMPLICIT NONE
REAL,PARAMETER :: PPFLOATMIN = 2.0**(-126)
INTEGER, INTENT(IN) :: KX,KY
!INTEGER, INTENT(IN) :: KNBLEV
INTEGER, INTENT(IN) :: KNBTOT
REAL(KIND=8),DIMENSION(KNBTOT),INTENT(INOUT) :: XTAB
INTEGER, INTENT(OUT) :: KNBUSE
INTEGER :: INBLEV
INTEGER,DIMENSION(:), ALLOCATABLE :: ITAB
REAL :: XMIN,XMAX
TYPE(SOP_t) :: SOPRES
INTEGER :: IND1, IND2
INTEGER :: GELT,IBE
INTEGER :: ILEVNBELT
INTEGER :: NBITCOD
INTEGER :: II, JI, JJ
INTEGER :: BITOFFSET
INTEGER :: GRPIDX,GRPOFF,IDXSAVE,OFFSAVE
INTEGER :: nbgroupmod
INTEGER :: IEXTCOD
CHARACTER(LEN=8),PARAMETER :: KEYWORD='COMPRESS'
REAL,DIMENSION(KNBTOT) :: XWORKTAB
LOGICAL :: LUPREAL,LNAN
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logical :: gnansupport
ILEVNBELT = KX*KY
LUPREAL = .FALSE.
LNAN = .FALSE.
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if ( IEEE_SUPPORT_NAN( xtab(1)) ) then
gnansupport=.true.
else
gnansupport=.false.
end if
! Check for NAN and change Upper and Lower bound according to 32bits real limits.
DO JI=1,KNBTOT
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IF ( gnansupport .and. IEEE_IS_NAN(XTAB(JI)) ) THEN
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XTAB(JI)=0.
LNAN = .TRUE.
ELSE IF (ABS(XTAB(JI)) > HUGE(1.0_4)) THEN
XTAB(JI) = SIGN(REAL(HUGE(1.0_4)/1.1,8),XTAB(JI))
LUPREAL = .TRUE.
ELSEIF (ABS(XTAB(JI)) < TINY(1.0_4)) THEN
XTAB(JI) = 0.
END IF
END DO
XMIN=MINVAL(XTAB)
XMAX=MAXVAL(XTAB)
PRINT *,'MINVAL,MAXVAL= ',XMIN,XMAX
IF (LNAN) PRINT *,"==================> NAN values DETECTED : set to 0.0"
IF (LUPREAL) PRINT *,"==================> OVERFLOW values DETECTED : set to ",HUGE(1.0_4)/1.1
! Convert 64 bits real to 32 bits real
XWORKTAB(:) = XTAB(:)
!
! BEWARE : Now XTAB is overwritten.
! XWORKTAB contains the 32 bits floating point data.
!
CALL SET_FILLIDX(0,0)
! store 8 characters header string in buffer
DO II=1,LEN(KEYWORD)
CALL FILL_BBUFF(XTAB,8,ICHAR(KEYWORD(II:II)))
END DO
! is whole array XTAB64 a constant field ?
IF (xmin == xmax) THEN
PRINT *,"--------> CONSTANT ARRAY !"
CALL FILL_BBUFF(XTAB,32,JPCSTENCOD)
CALL FILL_BBUFF(XTAB,32,KNBTOT)
CALL FILL_BBUFF(XTAB,32,xmin)
CALL GET_FILLIDX(KNBUSE,BITOFFSET)
KNBUSE=KNBUSE+1
RETURN
END IF
INBLEV = KNBTOT/(ILEVNBELT)
IF (KNBTOT /= (INBLEV*ILEVNBELT)) THEN
PRINT *,'Pb in COMPRESS_FIELD : KNBTOT must be a multiple of KX*KY'
STOP
END IF
ALLOCATE(ITAB(ILEVNBELT))
CALL INI_SOPDATA(SOPRES)
CALL FILL_BBUFF(XTAB,32,JPEXTENCOD)
CALL FILL_BBUFF(XTAB,32,KNBTOT)
CALL FILL_BBUFF(XTAB,32,KX)
CALL FILL_BBUFF(XTAB,32,KY)
DO JI=1,INBLEV
IND1=(JI-1)*ILEVNBELT+1
IND2=JI*ILEVNBELT
IF (LPDEBUG) PRINT *,"---- Compressing Level ",JI," ----"
CALL COMP_FOPEXT(XWORKTAB(IND1:IND2),ITAB,IEXTCOD)
IF (IEXTCOD /= JPCONST) THEN
CALL INVERTCOL(ITAB,KX,KY)
CALL RECSEARCH(ITAB,SOPRES)
GELT = MAXVAL(SOPRES%IEND(1:SOPRES%NBGRP)-SOPRES%IBEG(1:SOPRES%NBGRP)+1)
IBE = FMINBITS_IN_WORD(GELT)
CALL GET_FILLIDX(GRPIDX,GRPOFF) ! save the idx/offset for future NBGRP modification
CALL FILL_BBUFF(XTAB,32,SOPRES%NBGRP)
CALL FILL_BBUFF(XTAB,5,IBE)
NBGROUPMOD = SOPRES%NBGRP
DO II=1,SOPRES%NBGRP
GELT = SOPRES%IEND(II)-SOPRES%IBEG(II)+1
nbitcod = FMINBITS_IN_WORD(SOPRES%VALMAX(II)-SOPRES%VALMIN(II))
! PRINT *, 'Groupe',II,'(',GELT,')',':',SOPRES%IBEG(II),SOPRES%IEND(II),&
! &'MIN,MAX=',SOPRES%VALMIN(II),SOPRES%VALMAX(II),&
! &'(',SOPRES%VALMAX(II)-SOPRES%VALMIN(II),'/',&
! &nbitcod,')'
IF (nbitcod >= 16) THEN
PRINT *,'-----> ERREUR FATALE : Groupe',II,'codage sur ',nbitcod,'bits'
END IF
IF (GELT > 1) THEN
! Plus d'un element dans le groupe
IF ((17*GELT) < (17+4+IBE+nbitcod*GELT)) THEN
! on prefere GELT groupes de 1 elt
DO JJ=SOPRES%IBEG(II),SOPRES%IEND(II)
! 1 seul elt par groupe
CALL FILL_BBUFF(XTAB,1,1)
CALL FILL_BBUFF(XTAB,16,ITAB(JJ))
END DO
NBGROUPMOD = NBGROUPMOD+GELT-1
ELSE
CALL FILL_BBUFF(XTAB,1,0)
CALL FILL_BBUFF(XTAB,16,SOPRES%VALMIN(II))
CALL FILL_BBUFF(XTAB,4,nbitcod)
CALL FILL_BBUFF(XTAB,IBE,GELT)
IF (nbitcod > 0) THEN
DO JJ=SOPRES%IBEG(II),SOPRES%IEND(II)
! stockage des GELT carts/VALMIN
CALL FILL_BBUFF(XTAB,nbitcod,ITAB(JJ)-SOPRES%VALMIN(II))
END DO
END IF
END IF
ELSE
! 1 seul elt dans groupe
CALL FILL_BBUFF(XTAB,1,1)
CALL FILL_BBUFF(XTAB,16,SOPRES%VALMIN(II))
END IF
END DO
IF (NBGROUPMOD > SOPRES%NBGRP) THEN
! we must change the number of elements
CALL GET_FILLIDX(IDXSAVE,OFFSAVE) ! save the current idx/offset
CALL SET_FILLIDX(GRPIDX,GRPOFF)
CALL FILL_BBUFF(XTAB,32,NBGROUPMOD)
CALL SET_FILLIDX(IDXSAVE,OFFSAVE) ! restore the current idx/offset
END IF
END IF
END DO
CALL GET_FILLIDX(IDXSAVE,OFFSAVE)
KNBUSE=IDXSAVE+1
DEALLOCATE(ITAB)
CONTAINS
SUBROUTINE COMP_FOPEXT(PTAB,KTAB,KEXTCOD)
REAL, DIMENSION(:), INTENT(IN) :: PTAB
INTEGER, DIMENSION(:), INTENT(OUT):: KTAB
INTEGER, INTENT(OUT):: KEXTCOD
LOGICAL,DIMENSION(SIZE(PTAB)) :: GMASK
REAL,DIMENSION(SIZE(PTAB)) :: PTABWORK
REAL :: XMIN1,XMAX1,XRANGE1
REAL :: XMIN2,XMAX2,XRANGE2
REAL :: XREF,XMAX,XCOEFF
INTEGER :: INTRANGE
INTEGER :: INDCOR ! correction d'index pour la supression du min
LOGICAL :: GMINEXCL,GMAXEXCL,GLOG
INTEGER :: IEXTCOD2
REAL, PARAMETER :: XUNDEF = 999.
REAL, PARAMETER :: XUNDEFSURF = 1.E+20
!! G. TANGUY avril 2010 : on change la valeur indfinie 999. a une valeur
!indfinie plus grande que sera de faon certaine le max du champ s'il est
!present. POur a on travaille dans le tableau de travail PTABWORK
PTABWORK=PTAB
WHERE(PTABWORK == XUNDEF)
PTABWORK=XUNDEFSURF
END WHERE
XMIN1=MINVAL(PTABWORK(:))
XMAX1=MAXVAL(PTABWORK(:))
XRANGE1=XMAX1-XMIN1
IF (LPDEBUG) PRINT *,"XMIN1,XMAX1,XRANGE1 = ",XMIN1,XMAX1,XRANGE1
IF (XRANGE1 > 0.) THEN
XMIN2=MINVAL(PTABWORK,MASK=PTABWORK>XMIN1)
XMAX2=MAXVAL(PTABWORK,MASK=PTABWORK<XMAX1)
XRANGE2 = XMAX2-XMIN2
IF (LPDEBUG) PRINT *,"XMIN2,XMAX2,XRANGE2 = ",XMIN2,XMAX2,XRANGE2
IF (XRANGE2 > 0.) THEN
GLOG = .FALSE.
GMINEXCL = .FALSE.
GMAXEXCL = .FALSE.
GMASK(:) = .TRUE.
INDCOR = 0
KEXTCOD = JPNORM
INTRANGE=65535
XREF = XMIN1
XMAX = XMAX1
! Check for range between 0 and 1 to convert to LOG values
IF (XMIN1 >= 0. .AND. XMAX1 < 1.) THEN
IF ((XMAX2/XMIN2)>10.) THEN
GLOG = .TRUE.
KEXTCOD = JPOTHER
IEXTCOD2 = JPLOG
INTRANGE=INTRANGE-1
INDCOR = 1 ! On reserve la valeur 0 dans tous les cas
IF (XMIN1 == 0.0) THEN
XREF = LOG(XMIN2)
WHERE (PTABWORK < XMIN2)
KTAB = 0
GMASK = .FALSE.
END WHERE
ELSE
XREF = LOG(XMIN1)
END IF
XMAX1 = LOG(XMAX1)
XMAX = XMAX1
XMAX2 = LOG(XMAX2)
XRANGE2 = XMAX2 - XREF
IF (LPDEBUG) PRINT *,"EXTENCOD, LOG conversion enabled : XMIN1, XREF, XMAX1, XMAX2 =",&
&XMIN1,XREF,XMAX1,XMAX2
END IF
ELSE
! Check for MIN value exclusion
IF (XMIN1 == XUNDEFSURF .OR. (XMIN2-XMIN1) > XRANGE2) THEN
! Min value excluded
GMINEXCL = .TRUE.
XREF=XMIN2
INTRANGE=INTRANGE-1
INDCOR = 1
WHERE (PTABWORK < XMIN2)
KTAB = 0
GMASK = .FALSE.
END WHERE
IF (LPDEBUG) PRINT *,"EXTENCOD, Min value isolated :",XMIN1
KEXTCOD = JPMINEXCL
IF (XMIN1 == XUNDEFSURF) THEN
XMIN1=XUNDEF
END IF
END IF
! Check for MAX value exclusion
IF (XMAX1 == XUNDEFSURF .OR. (XMAX1-XMAX2) > XRANGE2) THEN
! Max value excluded
GMAXEXCL = .TRUE.
XMAX=XMAX2
INTRANGE=INTRANGE-1
WHERE (PTABWORK > XMAX2)
KTAB = 65535
GMASK = .FALSE.
END WHERE
IF (GMINEXCL) THEN
KEXTCOD = JPMINMAXEXCL ! Min et Max exclus
IF (LPDEBUG) PRINT *,"EXTENCOD, and Max value isolated :",XMAX1
ELSE
KEXTCOD = JPMAXEXCL ! Max exclus
IF (LPDEBUG) PRINT *,"EXTENCOD, Max value isolated :",XMAX1
END IF
! avril 2010 : on remet la valeur indefine de mesonh 999.
IF (XMAX1 == XUNDEFSURF) THEN
XMAX1=XUNDEF
END IF
END IF
END IF
!
XCOEFF=(XMAX-XREF)/INTRANGE
IF (XCOEFF < PPFLOATMIN) THEN
XCOEFF = PPFLOATMIN
PRINT *, "very low range DATA : XCOEFF set to",XCOEFF
END IF
IF (LPDEBUG) PRINT *,"XCOEFF = ",XCOEFF
IF (GLOG) THEN
WHERE(GMASK)
KTAB = INDCOR + NINT((LOG(PTABWORK)-XREF)/XCOEFF)
END WHERE
ELSE
WHERE(GMASK)
KTAB = INDCOR + NINT((PTABWORK(:)-XREF)/XCOEFF)
END WHERE
END IF
IF (LPDEBUG) PRINT *,"KEXTCOD = ",KEXTCOD
CALL FILL_BBUFF(XTAB,3,KEXTCOD)
IF (GLOG) CALL FILL_BBUFF(XTAB,3,IEXTCOD2)
IF (GMINEXCL) CALL FILL_BBUFF(XTAB,32,XMIN1)
IF (GMAXEXCL) CALL FILL_BBUFF(XTAB,32,XMAX1)
CALL FILL_BBUFF(XTAB,32,XREF)
CALL FILL_BBUFF(XTAB,32,XCOEFF)
ELSE
IF (XRANGE2 < 0.) THEN
! only 2 values in PTAB array
!
! KTAB(i)= 0 if PTAB(i)==XMIN1
! 1 if PTAB(i)==XMAX1
!
IF (LPDEBUG) PRINT *,"EXTENCOD, 2 values in array :",XMIN1,XMAX1
IF (XMAX1 == XUNDEFSURF) THEN
XMAX1=XUNDEF
END IF
IF (XMIN1 == XUNDEFSURF) THEN
XMIN1=XUNDEF
END IF
KEXTCOD = JP2VAL
CALL FILL_BBUFF(XTAB,3,KEXTCOD)
CALL FILL_BBUFF(XTAB,32,XMIN1)
CALL FILL_BBUFF(XTAB,32,XMAX1)
WHERE (PTABWORK < XMAX1)
KTAB = 0
ELSEWHERE
KTAB = 1
END WHERE
ELSE
! XRANGE2 == 0. <==> XMIN2=XMAX2
! 3 values in PTAB array :
!
! 0 if PTAB(i)==XMIN1 ! KTAB(i)= 1 if PTAB(i)==XMIN2(=XMAX2)
! 2 if PTAB(i)==XMAX1
!
IF (LPDEBUG) PRINT *,"EXTENCOD, 3 values in array :",XMIN1,XMIN2,XMAX1
IF (XMAX1 == XUNDEFSURF) THEN
XMAX1=XUNDEF
END IF
IF (XMIN1 == XUNDEFSURF) THEN
XMIN1=XUNDEF
END IF
KEXTCOD = JP3VAL
CALL FILL_BBUFF(XTAB,3,KEXTCOD)
CALL FILL_BBUFF(XTAB,32,XMIN1)
CALL FILL_BBUFF(XTAB,32,XMIN2)
CALL FILL_BBUFF(XTAB,32,XMAX1)
WHERE (PTABWORK < XMIN2)
KTAB = 0
ELSEWHERE
KTAB = 1
END WHERE
WHERE (PTABWORK > XMIN2) KTAB = 2
END IF
END IF
ELSE
IF (XMIN1 == XUNDEFSURF) THEN
XMIN1=XUNDEF
END IF
! Constant array found : save its 32 bits real value.
KEXTCOD=JPCONST
CALL FILL_BBUFF(XTAB,3,KEXTCOD)
CALL FILL_BBUFF(XTAB,32,XMIN1)
IF (LPDEBUG) PRINT *,"EXTENCOD, constant array : ",XMIN1
END IF
END SUBROUTINE COMP_FOPEXT
END SUBROUTINE COMPRESS_FIELD