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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 INTFAU(FLDIN,INLEN)
C
C---->
C**** INTFAU
C
C Purpose
C -------
C
C Prepare to interpolate input field...
C
C
C Interface
C ---------
C
C IRET = INTFAU( 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.
C
C
C Method
C ------
C
C Unpack field if GRIB.
C
C
C Externals
C ---------
C
C None.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF Jan 1995
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"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 26300 )
INTEGER JPLEN, JPNM
PARAMETER ( JPNM = JPSTRUNC )
PARAMETER ( JPLEN = (JPNM+1)*(JPNM+2) )
C
C Local variables
C
REAL POLELAT, POLELON
CHARACTER*1 TYPE
INTEGER NUMPTS, NGAUSS
INTEGER ISIZE, NBYTES, ITRUNC
DATA ISIZE/0/
C
REAL SWORK
DIMENSION SWORK(1)
#ifdef POINTER_64
INTEGER*8 ISWORK
#endif
POINTER ( ISWORK, SWORK)
C
REAL*8 DWORK
DIMENSION DWORK(1)
#ifdef POINTER_64
INTEGER*8 IDWORK
#endif
POINTER ( IDWORK, DWORK )
C
REAL*8 DATA
DIMENSION DATA(1)
#ifdef POINTER_64
INTEGER*8 IDATA
#endif
POINTER ( IDATA, DATA)
C
SAVE ISIZE, ISWORK, IDWORK, IDATA
C
REAL*8 DLON, DLAT
LOGICAL LOK
#ifdef CRAY
DATA NBYTES/8/
#else
DATA NBYTES/4/
#endif
C
C Externals
INTEGER GGROTAT
#ifdef __uxp__
LOGICAL JACOBIF
EXTERNAL JACOBIF
#else
LOGICAL JACOBI
EXTERNAL JACOBI
#endif
INTEGER IRET
INTEGER LOOP
C
C ------------------------------------------------------------------
C* Section 1. Initialise
C ------------------------------------------------------------------
C
100 CONTINUE
INTFAU = 0
IRET = 0
C
C ------------------------------------------------------------------
C* Section 2. Decode data from the GRIB code
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,'INTFAU: ZNFELDI allocate fail',JPQUIET)
INTFAU = IRET
GOTO 900
ENDIF
IZNJDCI = 1952999238
ENDIF
C
C Move unpacked values in from user array
DO 210 LOOP = 1, INLEN
ZNFELDI( LOOP ) = FLDIN( LOOP )
210 CONTINUE
C
C ------------------------------------------------------------------
C* Section 3. Handle spectral rotation, if necessary.
C ------------------------------------------------------------------
C
300 CONTINUE
C
C Is the interpolation from SH with a rotation of the SH first?
C
IF( ((NIREPR.EQ.JPSPHERE).OR.(NIREPR.EQ.JPSPHROT)) .AND.
X LNOROTA ) THEN
C
C Avoid rotating U or V spectral coefficients
C
IF( (NIPARAM.EQ.131).OR.(NIPARAM.EQ.132) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFAU: Unable to rotate spectral U or V:',NIPARAM)
INTFAU = JPROUTINE + 6
GOTO 900
ENDIF
C
C Dynamically allocate memory for workspace.
C
C (Note the multiplication by 2 for REAL*8).
C
NUMPTS = INLEN
ISIZE = NUMPTS*2
CALL JMEMHAN( 11, IDWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTFAU: memory allocation fail',IDWORK)
INTFAU = JPROUTINE + 1
GOTO 900
ENDIF
C
C (Note the multiplication by 2 for REAL*8).
C
ISIZE = JPLEN*2
CALL JMEMHAN( 15, IDATA, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTFAU: memory allocation fail',IDATA)
INTFAU = JPROUTINE + 2
GOTO 900
ENDIF
C
CALL INTLOG(JP_DEBUG,'INTFAU: Rotate SH field.',JPQUIET)
CALL INTLOG(JP_DEBUG,'INTFAU: South pole latitude ',NOROTA(1))
CALL INTLOG(JP_DEBUG,'INTFAU: South pole longitude ',NOROTA(2))
IF ( NOREPR.EQ.JPSPHERE ) NOREPR = JPSPHROT
IF ( NOREPR.EQ.JPREGULAR ) NOREPR = JPREGROT
ITRUNC = NIRESO
#if (defined CRAY) || (defined REAL_8)
DLAT = -90.0 - REAL(NOROTA(1))/JPMULT
DLON = - REAL(NOROTA(2))/JPMULT
C
C Rotate the spectral field by longitude.
CALL RPHI( ZNFELDI, ITRUNC, DWORK, DLON)
C
C Rotate the spectral field by latitude.
#if (!defined __uxp__)
LOK = JACOBI( ZNFELDI, ITRUNC, DWORK, DLAT)
#else
LOK = JACOBIF(ZNFELDI, ITRUNC, DWORK, DLAT)
#endif
#else
DLAT = -90.0 - DBLE(NOROTA(1))/JPMULT
DLON = - DBLE(NOROTA(2))/JPMULT
C
C Expand spectral coefficients to REAL*8
C
DO LOOP = 1, NUMPTS
DATA(LOOP) = DBLE(ZNFELDI(LOOP))
ENDDO
C
C Rotate the spectral field by longitude.
CALL RPHI( DATA, ITRUNC, DWORK, DLON)
C
C Rotate the spectral field by latitude.
C
#if (!defined __uxp__)
LOK = JACOBI( DATA, ITRUNC, DWORK, DLAT)
#else
LOK = JACOBIF( DATA, ITRUNC, DWORK, DLAT)
#endif
#endif
IF(.NOT.LOK) THEN
CALL INTLOG(JP_ERROR,'INTFAU: Spectral rotation fail',JPQUIET)
INTFAU = JPROUTINE + 3
GOTO 900
ENDIF
#if (!defined CRAY) && (!defined REAL_8)
C
C Repack spectral coefficients to REAL*4.
C
DO LOOP = 1, NUMPTS
ZNFELDI(LOOP) = SNGL(DATA(LOOP))
ENDDO
#endif
C
ENDIF
C
C ------------------------------------------------------------------
C* Section 4. Handle gaussian rotation, if necessary.
C ------------------------------------------------------------------
C
400 CONTINUE
C
C Is the interpolation from gaussian with a rotation of the
C gaussian first?
C
IF( ((NIREPR.EQ.JPGAUSSIAN).OR.(NIREPR.EQ.JPQUASI)) .AND.
X LNOROTA ) THEN
C
CALL INTLOG(JP_DEBUG,'INTFAU: Rotate gaussian field.',JPQUIET)
CALL INTLOG(JP_DEBUG,'INTFAU: South pole latitude ',NOROTA(1))
CALL INTLOG(JP_DEBUG,'INTFAU: South pole longitude ',NOROTA(2))
IF ( NOREPR.EQ.JPGAUSSIAN ) NOREPR = JPFGGROT
IF ( NOREPR.EQ.JPQUASI ) NOREPR = JPQGGROT
C
C Dynamically allocate memory for workspace.
C
NUMPTS = INLEN
ISIZE = NUMPTS
CALL JMEMHAN( 11, ISWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTFAU: memory allocation fail',ISWORK)
INTFAU = JPROUTINE + 4
GOTO 900
ENDIF
C
C Rotate the gaussian field.
C
POLELAT = REAL(NOROTA(1))/JPMULT
POLELON = REAL(NOROTA(2))/JPMULT
NGAUSS = NIGAUSS
IF( NIREPR.EQ.JPGAUSSIAN ) THEN
TYPE = 'F'
ELSE
TYPE = 'R'
ENDIF
IRET = GGROTAT(ZNFELDI,SWORK,NUMPTS,POLELAT,POLELON,TYPE,NGAUSS)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTFAU: Gaussian rotation fail',JPQUIET)
INTFAU = JPROUTINE + 5
GOTO 900
ENDIF
C
C Move rotated field back into field original array.
C
DO LOOP = 1, NUMPTS
ZNFELDI(LOOP) = SWORK(LOOP)
ENDDO
OUTLROT = NUMPTS
C
ENDIF
C
C
C ------------------------------------------------------------------
C* Section 9. Closedown.
C ------------------------------------------------------------------
C
900 CONTINUE
C
C Clear change flags for next product processing
C
RETURN
END
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