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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 HNTFAUH(FLDIN,INLEN)
C
C---->
C**** HNTFAUH
C
C Purpose
C -------
C
C Prepare to interpolate input field...
C
C
C Interface
C ---------
C
C IRET = HNTFAUH( FLDIN,INLEN)
C
C Input
C -----
C
C FLDIN - Input field (unpacked).
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 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 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 a land-sea mask
C HRG2GG - Creates rotated gaussian field from reduced gaussian
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 February 2001
C
C----<
C
IMPLICIT NONE
C
C Function arguments
C
INTEGER INLEN
REAL FLDIN(*)
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
#include "jparams.h"
#include "current.h"
#include "intlog.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 40150 )
INTEGER JPLEN, JPNM
PARAMETER ( JPNM = JPSTRUNC )
PARAMETER ( JPLEN = (JPNM+1)*(JPNM+2) )
C
C Local variables
C
LOGICAL LUSELSM
INTEGER NUMPTS, NGAUSS, NLON, NLAT, NUVFLAG, NTRUNC, NCOUNT
INTEGER IWORD, IERR, LOOP, IRET, ISIZE, KPTS(JPGTRUNC*2)
INTEGER ITEMP,K,I,J,IM,JM
REAL PLATS(JPGTRUNC*2),AREA(4),GRID(2),POLE(2),WEST,EAST
REAL TEMP(1440,1440)
CHARACTER*1 HOLDTYP
C
REAL SWORK(1), RGGRID(1)
#ifdef POINTER_64
INTEGER*8 ISWORK, IRGGRID
#endif
POINTER ( ISWORK, SWORK)
POINTER ( IRGGRID, RGGRID)
C
SAVE ISWORK, IRGGRID
C
LOGICAL LSP2RGG
C
C Externals
C
INTEGER HSP2GG, HIRLAM, HIRLSM, HRG2GG, FIXAREA, PDDEFS
LOGICAL LSMFLD
C
REAL POLELAT, POLELON
CHARACTER*1 TYPE
INTEGER NBYTES, ITRUNC
DATA ISIZE/0/
C
C -----------------------------------------------------------------|
C* Section 1. Initialise
C -----------------------------------------------------------------|
C
100 CONTINUE
C
HNTFAUH = 0
IRET = 0
C
NCOUNT = INLEN
C
C -----------------------------------------------------------------|
C* Section 2. Store input data.
C -----------------------------------------------------------------|
C
200 CONTINUE
C
C Allocate work array ZNFELDI if not already done.
C
IF( IZNJDCI.NE.1952999238 ) THEN
CALL JMEMHAN( 19, IZNFLDI, JPEXPAND, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_WARN,'HNTFAUH: ZNFELDI allocate fail',JPQUIET)
HNTFAUH = IRET
GOTO 900
ENDIF
IZNJDCI = 1952999238
ENDIF
C
C Move unpacked values in from user array
C
DO LOOP = 1, INLEN
ZNFELDI( LOOP ) = FLDIN( LOOP )
ENDDO
IF (NISCNM.EQ.64) THEN
CALL INTLOG(JP_DEBUG,
X 'HNTFAPH: Scanning flag west-east/south-north',NISCNM)
ITEMP = NIAREA(1)
NIAREA(1) = NIAREA(3)
NIAREA(3) = ITEMP
IM = NIWE
JM = NINS
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
C -----------------------------------------------------------------|
C* Section 3. Handle rotation, if necessary.
C -----------------------------------------------------------------|
C
300 CONTINUE
C
C Is rotation required?
C
IF( LNOROTA ) THEN
C
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,'HNTFAUH: Rotate field.',JPQUIET)
CALL INTLOG(JP_DEBUG,'HNTFAUH: South pole lat ',NOROTA(1))
CALL INTLOG(JP_DEBUG,'HNTFAUH: 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 'HNTFAUH: area fixup failed',JPQUIET)
HNTFAUH = 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
LSP2RGG = .FALSE.
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 'HNTFAUH: Spectral to suitable reduced gaussian',JPQUIET)
C
NTRUNC = NIRESO
IRET = HSP2GG(NTRUNC,NGAUSS,KPTS,PLATS,ISIZE)
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAUH: problem getting data for reduced gridl',NTRUNC)
HNTFAUH = JPROUTINE + 4
GOTO 900
ENDIF
NCOUNT = ISIZE
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 'HNTFAUH: memory alloc for reduced grid fail',JPQUIET)
HNTFAUH = 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 'HNTFAUH: spectral to reduced gaussian failed',JPQUIET)
HNTFAUH = JPROUTINE + 4
GOTO 900
ENDIF
HOGAUST = HOLDTYP
C
LSP2RGG = .TRUE.
C
C -----------------------------------------------------------------|
C* Section 5. Complete the spectral to rotated lat/long
C -----------------------------------------------------------------|
C
500 CONTINUE
C
IF( NOREPR.EQ.JPREGROT ) THEN
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAUH: Convert gaussian to rotated lat/long',JPQUIET)
C
GOTO 700
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 6. Complete the spectral to rotated gaussian
C -----------------------------------------------------------------|
C
600 CONTINUE
C
IF( NOREPR.EQ.JPFGGROT ) THEN
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAUH: Convert gaussian to rotated gaussian',JPQUIET)
C
GOTO 800
ENDIF
ENDIF
C
C -----------------------------------------------------------------|
C* Section 7. Gaussian to rotated lat/long
C -----------------------------------------------------------------|
C
700 CONTINUE
C
IF( (LSP2RGG.AND.(NOREPR.EQ.JPREGROT)) .OR.
X ( ((NIREPR.EQ.JPQUASI).OR.(NIREPR.EQ.JPGAUSSIAN)) .AND.
X (NOREPR.EQ.JPREGROT) ) ) THEN
IF( LDEBUG )
X CALL INTLOG(JP_DEBUG,'HNTFAUH: Gauss to lat/lon',JPQUIET)
C
C Dynamically allocate memory for rotated lat/long grid
C
NLON = 1 + NINT(FLOAT((NOAREA(JPEAST) - NOAREA(JPWEST))) /
X NOGRID(JPWESTEP))
NLAT = 1 + NINT(FLOAT((NOAREA(JPNORTH) - NOAREA(JPSOUTH))) /
X NOGRID(JPNSSTEP))
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 'HNTFAUH: memory alloc for lat/long grid fail',JPQUIET)
HNTFAUH = 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 = NIGAUSS
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
cs setting size of output field
OUTLROT = NLON * NLAT
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAUH: HIRLAM rotation failed',JPQUIET)
HNTFAUH = JPROUTINE + 7
GOTO 900
ENDIF
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 8. Gaussian to rotated gaussian
C -----------------------------------------------------------------|
C
800 CONTINUE
C
IF( (LSP2RGG.AND.(NOREPR.EQ.JPFGGROT)) .OR.
X (((NIREPR.EQ.JPQUASI).OR.(NIREPR.EQ.JPGAUSSIAN)) .AND.
X (NOREPR.EQ.JPFGGROT)) ) THEN
IF( LDEBUG ) CALL INTLOG(JP_DEBUG,
X 'HNTFAUH: 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 'HNTFAUH: memory alloc for gaussian grid fail',JPQUIET)
HNTFAUH = 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 = NIGAUSS
IRET = HRG2GG(LO12PT,ZNFELDI,NGAUSS,AREA,POLE,
X NOGAUSS,HOGAUST,SWORK,ISIZE,NUMPTS)
ENDIF
cs setting size of output field
OUTLROT = NUMPTS
IF( IRET.NE.0 ) THEN
IF( LDEBUG ) CALL INTLOG(JP_ERROR,
X 'HNTFAUH: HRG2GG rotation failed',JPQUIET)
HNTFAUH = JPROUTINE + 8
GOTO 900
ENDIF
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 9. Closedown.
C -----------------------------------------------------------------|
C
C Move rotated field back into field original array.
C
DO LOOP = 1, NUMPTS
ZNFELDI(LOOP) = SWORK(LOOP)
ENDDO
C
ENDIF
C
900 CONTINUE
C
RETURN
END
|
