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C Copyright 1981-2016 ECMWF.
C
C This software is licensed under the terms of the Apache Licence
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities
C granted to it by virtue of its status as an intergovernmental organisation
C nor does it submit to any jurisdiction.
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 HSH2GG - Find suitable gaussian grid/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* 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 "intf.h"
#include "current.h"
#include "grfixed.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 40110 )
C
C Local variables
C
CHARACTER*1 HOLDTYP
CHARACTER*1 HTYPE
INTEGER IERR
INTEGER IRET
INTEGER ISHIZE
INTEGER ISIZE
INTEGER ITEMP,K,I,J,IM,JM
INTEGER IWORD
INTEGER KPTS(JPGTRUNC*2)
INTEGER LOOP
INTEGER NCOUNT
INTEGER NGAUSS
INTEGER NLAT
INTEGER NLON
INTEGER NTRUNC
INTEGER NUMPTS
INTEGER NUVFLAG
LOGICAL LLATOUT
LOGICAL LSP2RGG
LOGICAL LUSELSM
REAL AREA(4)
REAL EAST
REAL EW
REAL GRID(2)
REAL NS
REAL OLDGRID(2)
REAL PLATS(JPGTRUNC*2)
REAL POLE(2)
REAL RGGRID(1)
REAL SWORK(1)
REAL TEMP(1440,1440)
REAL WEST
REAL ZNFLDO(1)
#ifndef _CRAYFTN
#ifdef POINTER_64
INTEGER*8 IRGGRID
INTEGER*8 ISWORK
INTEGER*8 IZNFLDO
#endif
#endif
POINTER (IRGGRID, RGGRID)
POINTER (ISWORK, SWORK)
POINTER (IZNFLDO, ZNFLDO)
C
SAVE IRGGRID
SAVE ISWORK
SAVE IZNFLDO
C
C Externals
C
CHARACTER*1 GGHTYPE
INTEGER HSH2GG, HIRLAM, HIRLSM, HRG2GG, FIXAREA, PDDEFS
INTEGER HLL2LL
LOGICAL LSMFLD
EXTERNAL GGHTYPE
EXTERNAL HSH2GG, HIRLAM, HIRLSM, HRG2GG, FIXAREA, PDDEFS
EXTERNAL HLL2LL
EXTERNAL LSMFLD
C
C -----------------------------------------------------------------|
C* Section 1. Initialise
C -----------------------------------------------------------------|
C
100 CONTINUE
C
HNTFAPH = 0
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)
IF( .NOT.LNOROTA ) GOTO 900
C
C -----------------------------------------------------------------|
C* Section 3. Handle rotation, if necessary.
C -----------------------------------------------------------------|
C
300 CONTINUE
C
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))
C
C Fill area limits (handles case when default 0/0/0/0 given)
C
IRET = FIXAREA()
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'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
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Spectral to suitable reduced gaussian',JPQUIET)
C
NIRESO = ISEC2(2)
NTRUNC = ISEC2(2)
IF( LNORESO ) THEN
NTRUNC = NORESO
NGAUSS = 0
HTYPE = ''
NS = 0.
EW = 0.
IRET = HSH2GG(NS,EW,NTRUNC,NGAUSS,HTYPE,KPTS,PLATS,ISIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: problem getting data for reduced grid',NTRUNC)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
GOTO 401
ENDIF
IF( LARESOL ) THEN
NS = 0.
EW = 0.
IF( LLATOUT ) THEN
NS = GRID(1)
EW = GRID(2)
NTRUNC = 0
NGAUSS = 0
HTYPE = ''
ELSE
HTYPE = 'R'
ENDIF
IRET = HSH2GG(NS,EW,NTRUNC,NGAUSS,HTYPE,KPTS,PLATS,ISIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: problem getting data for reduced grid',NTRUNC)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
ENDIF
C Truncate if a smaller resolution has been requested
C
401 CONTINUE
IF( NTRUNC.LT.NIRESO ) 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)
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 Generate spherical harmonics with output truncation
CALL SH2SH( ZNFELDI, NIRESO, ZNFLDO, NTRUNC )
C Move new spherical harmonics to 'input' array
ZNFELDI(1:ISHIZE) = ZNFLDO(1:ISHIZE)
ELSE
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Spectral to suitable reduced gaussian',JPQUIET)
C
NTRUNC = ISEC2(2)
NGAUSS = 0
HTYPE = ''
NS = 0.
EW = 0.
IRET = HSH2GG(NS,EW,NTRUNC,NGAUSS,HTYPE,KPTS,PLATS,ISIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: problem getting data for reduced grid',NTRUNC)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
ENDIF
C
C Dynamically allocate memory for global reduced gaussian grid
C
CALL JMEMHAN( 18, IRGGRID, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for reduced grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
C Set flag to show field is not a wind component
NUVFLAG = 0
C Create the reduced gaussian grid
HOLDTYP = HOGAUST
WEST = 0.0
EAST = 360.0 - (360.0/(NGAUSS*4))
c EMOS-199: adjusted for reduced_gg/octahedral
IF (HTYPE.EQ.'O') EAST = 360.0 - (360.0/FLOAT(KPTS(NGAUSS)))
IF (HTYPE.NE.'R' .AND. HTYPE.NE.'O' .AND.
X HTYPE.NE.'F' .AND. HTYPE.NE.'U') THEN
HTYPE = 'R'
ENDIF
CALL JAGGGP(ZNFELDI,NTRUNC,PLATS(1),PLATS(NGAUSS*2),WEST,
X EAST,NGAUSS,HTYPE,KPTS,RGGRID,NUVFLAG,IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: spectral to reduced gaussian failed',JPQUIET)
HNTFAPH = JPROUTINE + 4
GOTO 900
ENDIF
HOGAUST = HOLDTYP
NCOUNT = 0
DO LOOP = 1, (NGAUSS*2)
NCOUNT= NCOUNT + KPTS(LOOP)
ENDDO
LSP2RGG = .TRUE.
IF( NOREPR.EQ.JPFGGROT ) THEN
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Convert gaussian to rotated gaussian',JPQUIET)
GOTO 600
ENDIF
ENDIF
C
C -----------------------------------------------------------------|
C* Section 5. Gaussian to rotated lat/long
C -----------------------------------------------------------------|
C
500 CONTINUE
C
IF( (LLATOUT) .AND. (
X (NIREPR.EQ.JPQUASI) .OR.
X (NIREPR.EQ.JPGAUSSIAN) .OR.
X (LSP2RGG) )) THEN
C
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
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for lat/long grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 5
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,HTYPE,AREA,POLE,
X GRID,SWORK,ISIZE,NLON,NLAT)
ELSE
IRET = HIRLAM(LO12PT,RGGRID,NCOUNT,NGAUSS,HTYPE,AREA,POLE,
X GRID,SWORK,ISIZE,NLON,NLAT)
ENDIF
C
ELSE
C
C If original field was gaussian, ...
C
IRET = PDDEFS()
NGAUSS = ISEC2(10)
HTYPE = GGHTYPE(NIREPR,NGAUSS,MILLEN)
cs IF( LUSELSM ) THEN
IF( LSM ) THEN
IRET = HIRLSM(LO12PT,ZNFELDI,NCOUNT,NGAUSS,HTYPE,AREA,POLE,
X GRID,SWORK,ISIZE,NLON,NLAT)
ELSE
IRET = HIRLAM(LO12PT,ZNFELDI,NCOUNT,NGAUSS,HTYPE,AREA,POLE,
X GRID,SWORK,ISIZE,NLON,NLAT)
ENDIF
C
ENDIF
C
IF( IRET.NE.0 ) THEN
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
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Gaussian to reduced gaussian',JPQUIET)
C
C Dynamically allocate memory for rotated lat/long grid
C
C ISIZE = NOGAUSS * NOGAUSS * 8
ISIZE = (2*NOGAUSS) * (4*NOGAUSS + 20) ! account for RGG/octahedral
CALL JMEMHAN( 11, ISWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: memory alloc for gaussian grid fail',JPQUIET)
HNTFAPH = JPROUTINE + 6
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
CALL INTLOG(JP_ERROR,
X 'HNTFAPH: HRG2GG rotation failed',JPQUIET)
HNTFAPH = JPROUTINE + 6
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
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
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 move rotated field back into field original array
ZNFELDI(1:NUMPTS) = SWORK(1:NUMPTS)
C -----------------------------------------------------------------|
C* Section 9. Closedown.
C -----------------------------------------------------------------|
C
900 CONTINUE
C
RETURN
END
|
