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|
C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
INTEGER FUNCTION HNTFAPH(INGRIB,INLEN)
C
C---->
C**** HNTFAPH
C
C Purpose
C -------
C
C Prepare to interpolate to grid point field.
C
C
C Interface
C ---------
C
C IRET = HNTFAPH(INGRIB,INLEN)
C
C Input
C -----
C
C INGRIB - Input field (packed).
C INLEN - Input field length (words).
C
C
C Output
C ------
C
C Field unpacked values are in ZNFELDI, rotated if necessary.
C
C Returns: 0, if OK. Otherwise, an error occured in interpolation.
C
C
C Method
C ------
C
C Unpack field.
C
C If the input is a spectral field and the output is a rotated
C grid-point field, create a global reduced gaussian field and
C then create the rotated grid-point field from it.
C
C
C Externals
C ---------
C
C GRIBEX - Decode/encode GRIB product.
C GRSVCK - Turn off GRIB checking
C INTLOG - Log error message.
C INTLOGR - Log error message.
C JDEBUG - Checks environment to switch on/off debug
C FIXAREA - Fixup input/output field area definitions.
C HSP2GG - Find suitable gaussian grid for spectral truncation
C HIRLAM - Creates rotated lat/long field from reduced gaussian
C HIRLSM - Creates rotated lat/long field from reduced gaussian
C using land-sea mask
C HRG2GG - Creates rotated gaussian field from reduced gaussian
C HLL2LL - Creates rotated lat/long field from lat/long field
C LSMFLD - Determines whether a field is to be interpolated using
C a land-sea mask
C
C
C Author
C ------
C
C J.D.Chambers ECMWF January 31, 2001
C
C
C----<
C
C -----------------------------------------------------------------|
C* Section 0. Variables
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
C Function arguments
C
INTEGER INGRIB(*),INLEN
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
#include "jparams.h"
#include "current.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 40110 )
C
C Local variables
C
LOGICAL LUSELSM, LDEBUG, LSP2RGG, LLATOUT
INTEGER NUMPTS, NGAUSS, NLON, NLAT, NUVFLAG, NTRUNC, NCOUNT
INTEGER IWORD, IERR, LOOP, IRET, ISIZE, KPTS(JPGTRUNC*2)
INTEGER ISHIZE
INTEGER ITEMP,K,I,J,IM,JM
REAL PLATS(JPGTRUNC*2),AREA(4),GRID(2),POLE(2),WEST,EAST
REAL OLDGRID(2)
REAL TEMP(1440,1440)
CHARACTER*1 HOLDTYP
C
REAL SWORK(1), RGGRID(1), ZNFLDO(1)
#ifdef POINTER_64
INTEGER*8 ISWORK, IRGGRID, IZNFLDO
#endif
POINTER ( ISWORK, SWORK)
POINTER ( IRGGRID, RGGRID)
POINTER ( IZNFLDO, ZNFLDO )
C
SAVE ISWORK, IRGGRID
C
C Externals
C
INTEGER HSP2GG, HIRLAM, HIRLSM, HRG2GG, HLL2LL, FIXAREA,PDDEFS
INTEGER HSP2GG2,HSP2GG3
LOGICAL LSMFLD
C
C -----------------------------------------------------------------|
C* Section 1. Initialise
C -----------------------------------------------------------------|
C
100 CONTINUE
C
HNTFAPH = 0
C
C Check if debug option turned on
C
CALL JDEBUG()
LDEBUG = ( NDBG.NE.0 )
C
LSP2RGG = .FALSE.
C
C -----------------------------------------------------------------|
C* Section 2. Decode data from the GRIB code
C -----------------------------------------------------------------|
C
200 CONTINUE
C
C Decode data from GRIB code (no checking)
C
IERR = 0
CALL GRSVCK(0)
C
IERR = 1
IWORD = INLEN
ISEC3(2) = NINT(RMISSGV)
ZSEC3(2) = RMISSGV
CALL GRIBEX(ISEC0, ISEC1, ISEC2, ZSEC2, ISEC3, ZSEC3, ISEC4,
X ZNFELDI, JPEXPAND, INGRIB, INLEN, IWORD, 'D',IERR)
IF (ISEC2(11).EQ.64) THEN
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Scanning flag west-east/south-north',ISEC2(11))
ITEMP = NIAREA(1)
NIAREA(1) = NIAREA(3)
NIAREA(3) = ITEMP
IM = ISEC2(2)
JM = ISEC2(3)
K=0
DO J=JM,1,-1
DO I=1,IM
K=K+1
TEMP(I,J) = ZNFELDI(K)
END DO
END DO
K=0
DO J=1,JM
DO I=1,IM
K=K+1
ZNFELDI(K) = TEMP(I,J)
END DO
END DO
ENDIF
C
IF( IERR.LT.0) THEN
IF( (IERR.EQ.-2).OR.(IERR.EQ.-4) ) THEN
CALL INTLOG(JP_DEBUG,'HNTFAPH: Use missing value',JPQUIET)
LIMISSV = .TRUE.
ELSE
CALL INTLOG(JP_ERROR,'HNTFAPH: GRIBEX decoding fail.',IERR)
HNTFAPH = JPROUTINE + 2
GOTO 900
ENDIF
ELSE IF( IERR.GT.0 ) THEN
CALL INTLOG(JP_ERROR,'HNTFAPH: GRIBEX decoding failed.',IERR)
HNTFAPH = JPROUTINE + 2
GOTO 900
ENDIF
C
NCOUNT = ISEC4(1)
C
LLATOUT = (NOREPR.EQ.JPREGROT).OR.(NOREPR.EQ.JPREGULAR)
C
IF( .NOT.LNOROTA ) GOTO 900
C
C -----------------------------------------------------------------|
C* Section 3. Handle rotation, if necessary.
C -----------------------------------------------------------------|
C
300 CONTINUE
C
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,'HNTFAPH: Rotate field.',JPQUIET)
CALL INTLOG(JP_DEBUG,'HNTFAPH: South pole lat ',NOROTA(1))
CALL INTLOG(JP_DEBUG,'HNTFAPH: South pole long ',NOROTA(2))
ENDIF
C
C Fill area limits (handles case when default 0/0/0/0 given)
C
IRET = FIXAREA()
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: area fixup failed',JPQUIET)
HNTFAPH = JPROUTINE + 3
GOTO 900
ENDIF
C
AREA(1) = REAL(NOAREA(1))/PPMULT
AREA(2) = REAL(NOAREA(2))/PPMULT
AREA(3) = REAL(NOAREA(3))/PPMULT
AREA(4) = REAL(NOAREA(4))/PPMULT
C
GRID(1) = REAL(NOGRID(1))/PPMULT
GRID(2) = REAL(NOGRID(2))/PPMULT
C
POLE(1) = REAL(NOROTA(1))/PPMULT
POLE(2) = REAL(NOROTA(2))/PPMULT
C
C -----------------------------------------------------------------|
C* Section 4. Spectral to rotated grid-point
C -----------------------------------------------------------------|
C
400 CONTINUE
C
IF( (NIREPR.EQ.JPSPHERE).OR.(NIREPR.EQ.JPSPHROT) ) THEN
C
C Convert spectral to suitable global reduced gaussian grid
C
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Spectral to suitable reduced gaussian',JPQUIET)
C
NTRUNC = ISEC2(2)
NIRESO = ISEC2(2)
IF(LLATOUT) THEN
IRET = HSP2GG2(NTRUNC,GRID(1),GRID(2),NGAUSS,KPTS,PLATS,ISIZE)
ELSE
IRET = HSP2GG3(NTRUNC,NGAUSS,KPTS,PLATS,ISIZE)
ENDIF
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: problem getting data for reduced grid',NTRUNC)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,'HNTFAPH: Truncation changed from: ',NIRESO)
CALL INTLOG(JP_DEBUG,'HNTFAPH: to: ',NTRUNC)
CALL INTLOG(JP_DEBUG,'HNTFAPH: Gaussian number is : ',NGAUSS)
ENDIF
c---------------------------------------------------------------------
C Truncate if a smaller resolution has been requested
C
IF( NTRUNC.LT.NIRESO ) THEN
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Spectral coefficents truncated to ', NTRUNC)
C
ISHIZE = (NTRUNC+1)*(NTRUNC+4)
CALL JMEMHAN( 3, IZNFLDO, ISHIZE, 1, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_FATAL,
X 'HNTFAPH: Get scratch space failed',JPQUIET)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
C
C Generate spherical harmonics with output truncation
C
CALL SH2SH( ZNFELDI, NIRESO, ZNFLDO, NTRUNC )
C
C Move new spherical harmonics to 'input' array
C
DO LOOP = 1, ISHIZE
ZNFELDI(LOOP) = ZNFLDO(LOOP)
ENDDO
C
cs NIRESO = NTRUNC
C
ENDIF
c---------------------------------------------------------------------
cs ELSE
cs IRET = HSP2GG(NTRUNC,NGAUSS,KPTS,PLATS,ISIZE)
cs ENDIF
C
C Dynamically allocate memory for global reduced gaussian grid
C
CALL JMEMHAN( 18, IRGGRID, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for reduced grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
C
C Set flag to show field is not a wind component
C
NUVFLAG = 0
C
C Create the reduced gaussian grid
C
HOLDTYP = HOGAUST
WEST = 0.0
EAST = 360.0 - (360.0/(NGAUSS*4))
CALL JAGGGP(ZNFELDI,NTRUNC,PLATS(1),PLATS(NGAUSS*2),WEST,
X EAST,NGAUSS,'R',KPTS,RGGRID,NUVFLAG,IRET)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: spectral to reduced gaussian failed',JPQUIET)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
HOGAUST = HOLDTYP
C
NCOUNT = 0
DO LOOP = 1, (NGAUSS*2)
NCOUNT= NCOUNT + KPTS(LOOP)
ENDDO
C
LSP2RGG = .TRUE.
C
IF( NOREPR.EQ.JPFGGROT ) THEN
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Convert gaussian to rotated gaussian',JPQUIET)
C
GOTO 600
C
ENDIF
ENDIF
C
C -----------------------------------------------------------------|
C* Section 5. Gaussian to rotated lat/long
C -----------------------------------------------------------------|
C
500 CONTINUE
C
IF( (LSP2RGG.AND.LLATOUT) .OR.
X ( (NIREPR.EQ.JPGAUSSIAN).AND.LLATOUT) .OR.
X ( (NIREPR.EQ.JPQUASI).AND.LLATOUT) ) THEN
C
IF( LDEBUG )
X CALL INTLOG(JP_DEBUG,'HNTFAPH: Gauss to lat/lon',JPQUIET)
C
C Dynamically allocate memory for rotated lat/long grid
C
NLON = 1 + NINT((AREA(JPEAST) - AREA(JPWEST)) /
X GRID(JPWESTEP)) !SC
NLAT = 1 + NINT((AREA(JPNORTH) - AREA(JPSOUTH)) /
X GRID(JPNSSTEP)) !SC
C
NOWE = NLON
NONS = NLAT
C
NUMPTS = NLON * NLAT
ISIZE = NUMPTS
CALL JMEMHAN( 11, ISWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for lat/long grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 7
GOTO 900
ENDIF
C
LUSELSM = LSMFLD()
C
C If original field was spectral, ...
C
IF( LSP2RGG ) THEN
IF( LUSELSM ) THEN
IRET = HIRLSM(LO12PT,RGGRID,NCOUNT,NGAUSS,AREA,POLE,GRID,
X SWORK,ISIZE,NLON,NLAT)
ELSE
IRET = HIRLAM(LO12PT,RGGRID,NCOUNT,NGAUSS,AREA,POLE,GRID,
X SWORK,ISIZE,NLON,NLAT)
ENDIF
C
ELSE
C
C If original field was gaussian, ...
C
IRET = PDDEFS()
NGAUSS = ISEC2(10)
cs IF( LUSELSM ) THEN
IF( LSM ) THEN
IRET = HIRLSM(LO12PT,ZNFELDI,NCOUNT,NGAUSS,AREA,POLE,GRID,
X SWORK,ISIZE,NLON,NLAT)
ELSE
IRET = HIRLAM(LO12PT,ZNFELDI,NCOUNT,NGAUSS,AREA,POLE,GRID,
X SWORK,ISIZE,NLON,NLAT)
ENDIF
C
ENDIF
C
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: HIRLAM rotation failed',JPQUIET)
HNTFAPH = JPROUTINE + 7
GOTO 900
ENDIF
C
ISEC2(1) = JPREGROT
ISEC4(1) = NOWE * NONS
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 6. Gaussian to rotated gaussian
C -----------------------------------------------------------------|
C
600 CONTINUE
C
IF( (LSP2RGG.AND.(NOREPR.EQ.JPFGGROT)) .OR.
X (LSP2RGG.AND.(NOREPR.EQ.JPQGGROT)) .OR.
X (((NIREPR.EQ.JPQUASI).OR.(NIREPR.EQ.JPGAUSSIAN)) .AND.
X (NOREPR.EQ.JPFGGROT).OR.(NOREPR.EQ.JPQGGROT)) ) THEN
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Gaussian to reduced gaussian',JPQUIET)
C
C Dynamically allocate memory for rotated lat/long grid
C
ISIZE = NOGAUSS * NOGAUSS * 8
CALL JMEMHAN( 11, ISWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for gaussian grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 8
GOTO 900
ENDIF
C
C If original field was spectral, ...
C
IF( LSP2RGG ) THEN
IRET = HRG2GG(LO12PT,RGGRID,NGAUSS,AREA,POLE,
X NOGAUSS,HOGAUST,SWORK,ISIZE,NUMPTS)
C
ELSE
C
C If original field was gaussian, ...
C
NGAUSS = ISEC2(10)
IRET = HRG2GG(LO12PT,ZNFELDI,NGAUSS,AREA,POLE,
X NOGAUSS,HOGAUST,SWORK,ISIZE,NUMPTS)
ENDIF
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: HRG2GG rotation failed',JPQUIET)
HNTFAPH = JPROUTINE + 8
GOTO 900
ENDIF
C
IF( (NOREPR.EQ.JPQUASI).OR.
X (NOREPR.EQ.JPQGGROT).OR.
X (NOREPR.EQ.JPFGGROT).OR.
X (NOREPR.EQ.JPGAUSSIAN) ) THEN
ISEC2(1) = JPFGGROT
ELSE
ISEC2(1) = NOREPR
ENDIF
C
ISEC4(1) = NUMPTS
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 7. Lat/long to rotated lat/long
C -----------------------------------------------------------------|
C
700 CONTINUE
C
IF( (NIREPR.EQ.JPREGULAR) ) THEN
C
C Dynamically allocate memory for rotated lat/long grid
C
NLON = 1 + NINT((AREA(JPEAST) - AREA(JPWEST)) /
X GRID(JPWESTEP))
NLAT = 1 + NINT((AREA(JPNORTH) - AREA(JPSOUTH)) /
X GRID(JPNSSTEP))
C
NOWE = NLON
NONS = NLAT
C
NUMPTS = NLON * NLAT
ISIZE = NUMPTS
CALL JMEMHAN( 11, ISWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for lat/long grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 7
GOTO 900
ENDIF
C
OLDGRID(1) = REAL(NIGRID(1))/100000.0
OLDGRID(2) = REAL(NIGRID(2))/100000.0
IRET = HLL2LL(LO12PT,ZNFELDI,OLDGRID,AREA,POLE,GRID,SWORK,ISIZE,
X NLON,NLAT)
C
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAPH: HLL2LL rotation failed',JPQUIET)
HNTFAPH = JPROUTINE + 7
GOTO 900
ENDIF
C
ISEC2(1) = JPREGROT
ISEC4(1) = NOWE * NONS
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 8. Move rotated field back into field original array.
C -----------------------------------------------------------------|
C
800 CONTINUE
C
DO LOOP = 1, NUMPTS
ZNFELDI(LOOP) = SWORK(LOOP)
ENDDO
C
C -----------------------------------------------------------------|
C* Section 9. Closedown.
C -----------------------------------------------------------------|
C
900 CONTINUE
C
RETURN
END
|
