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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 INTFBP( INGRIB,INLEN,OUTGRIB,OUTLEN)
C
C---->
C**** INTFBP
C
C Purpose
C -------
C
C Interpolate input field...
C
C
C Interface
C ---------
C
C IRET = INTFBP( INGRIB,INLEN,OUTGRIB,OUTLEN)
C
C Input
C -----
C
C INGRIB - Input field (packed).
C INLEN - Input field length (words).
C
C
C Output
C ------
C
C OUTGRIB - Output field (packed).
C OUTLEN - Output field length (words).
C
C
C Method
C ------
C
C Call interpolation routines; then repack if GRIB output.
C
C Currently, subareas are not supported for reduced gaussian fields.
C (Works OK; but need to setup values in GRIB product for number of
C points in each latitude row)
C
C
C Externals
C ---------
C
C IARCNTL - Control interp. quasi reg.Gauss -> Gaussian or lat/long
C IAGCNTL - Control interpolation reg.Gaussian or lat/long fields.
C JSH2SH - Changes resolution of a field of spectral coefficients.
C JALLGP - Converts spectral input fields to lat/long grid fields.
C JALLWN - Converts spectral input wind fields to lat/long grids.
C JAGGGP - Converts spectral input fields to a gaussian grid field.
C IBASINI - Ensure basic interpolation setup is done.
C GRIBEX - Decode/encode GRIB product.
C GRSVCK - Turn off GRIB checking
C RESET_C - Reset interpolation handling options using GRIB product.
C IGSETUP - Setup GRIB sections for the output product.
C JMEMHAN - Handles memory allocation.
C IGLSIZE - Evaluate array sizes for reg. lat/long and area.
C IGSIZE - Evaluate array sizes for a regular Gaussian.
C IRSIZE - Evaluate array sizes for a quasi reg Gaussian.
C FIXAREA - Fixup area definition to correspond to grid definitions
C ISCRSZ - Calculate number of values in generated field.
C INTLOG - Log error message.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF Aug 1994
C
C J.D.Chambers ECMWF Feb 1997
C Allow for 64-bit pointers
C
C----<
C
IMPLICIT NONE
C
C Function arguments
INTEGER INGRIB(*),OUTGRIB(*),INLEN,OUTLEN
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
C
C Parameters
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 26500 )
C
C Local variables
C
CHARACTER*1 HFUNC
INTEGER IWORD, IERR, ILENF, ISIZE, IUV
REAL PNORTH, PSOUTH, PWEST, PEAST, PLATINC, PLONINC
LOGICAL OIWEGLOBE, OINPOLE, OISPOLE
LOGICAL OOWEGLOBE, OONPOLE, OOSPOLE
INTEGER KILN, KITOTAL, KOLN, KOTOTAL, KPR, KERR
#ifdef POINTER_64
INTEGER*8 IZNFLDO
#endif
REAL ZNFLDO
POINTER ( IZNFLDO, ZNFLDO )
DIMENSION ZNFLDO( 1 )
C
C Externals
C
INTEGER IGLSIZE, IGSIZE, IRSIZE, IARCNTL, IAGCNTL
INTEGER IGSETUP, FIXAREA, ISCRSZ
C
C ------------------------------------------------------------------
C* Section 1. Initialise
C ------------------------------------------------------------------
C
100 CONTINUE
INTFBP = 0
IERR = 0
KPR = 0
C
C Allocate work array ZNFELDI if not already done.
C
IF( IZNJDCI.NE.1952999238 ) THEN
CALL JMEMHAN( 19, IZNFLDI, JPEXPAND, 1, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_WARN,'INTFBP: ZNFELDI allocation fail',JPQUIET)
INTFBP = IERR
GOTO 900
ENDIF
IZNJDCI = 1952999238
ENDIF
C
C ------------------------------------------------------------------
C* Section 3. Interpolation spherical harmonics to spherical
C harmonics
C ------------------------------------------------------------------
C
300 CONTINUE
C
IF ( ((NIREPR.EQ.JPSPHERE).OR.(NIREPR.EQ.JPSPHROT)) .AND.
X ((NOREPR.EQ.JPSPHERE).OR.(NOREPR.EQ.JPSPHROT)) ) THEN
C
C Get scratch space for interpolation
ISIZE = ISCRSZ()
IF ( ISIZE .LE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space failed',ISIZE)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
CALL JMEMHAN( 3, IZNFLDO, ISIZE, 1, IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space fail',JPQUIET)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
C
CALL SH2SH( ZNFELDI, NIRESO, ZNFLDO, NORESO )
C
GOTO 700
C
C If not spectral -> spectral transformation, make sure the input
C and output area definitions have been setup.
C
ELSE
C
C Fixup area definition to correspond to grid definitions
IERR = FIXAREA()
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Fixup area definition failed.',JPQUIET)
INTFBP = JPROUTINE + 9
GOTO 900
ENDIF
C
C Setup geographical limits
PNORTH = FLOAT( NOAREA(1) ) / PPMULT
PWEST = FLOAT( NOAREA(2) ) / PPMULT
PSOUTH = FLOAT( NOAREA(3) ) / PPMULT
PEAST = FLOAT( NOAREA(4) ) / PPMULT
C
ENDIF
C
C ------------------------------------------------------------------
C Section 4. Interpolation spherical harmonics to grid point.
C ------------------------------------------------------------------
C
400 CONTINUE
C
IF ( (NIREPR.EQ.JPSPHERE).OR.(NIREPR.EQ.JPSPHROT) ) THEN
C
C Get scratch space for interpolation
C
ISIZE = ISCRSZ()
IF ( ISIZE .LE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space failed',ISIZE)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
C
CALL JMEMHAN( 3, IZNFLDO, ISIZE, 1, IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space fail',JPQUIET)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
C
C Setup wind flag
C
IF( .NOT.LWINDSET ) THEN
LWIND = ( ( NOTABLE.EQ.128 ).AND.
X ((NOPARAM.EQ.131).OR.(NOPARAM.EQ.132)) )
ENDIF
CALL INTLOG(JP_DEBUG,'INTFBP: Wind flag = ', LWIND)
IF ( LWIND ) THEN
IUV = 1
ELSE
IUV = 0
ENDIF
C
C ------------------------------------------------------------------
C* Section 4.1 Interpolation spherical harmonics to grid point.
C ------------------------------------------------------------------
C
410 CONTINUE
C
IF ( (NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPREGROT) ) THEN
C
C -> latitude/longitude grid
C
PLONINC = FLOAT( NOGRID(1) ) / PPMULT
PLATINC = FLOAT( NOGRID(2) ) / PPMULT
IF ( LWIND ) THEN
CALL JALLWN( ZNFELDI, NIRESO, PNORTH, PSOUTH, PWEST, PEAST,
X PLATINC, PLONINC, ZNFLDO, IERR)
ELSE
CALL JALLGP( ZNFELDI, NIRESO, PNORTH, PSOUTH, PWEST, PEAST,
X PLATINC, PLONINC, ZNFLDO, IERR)
ENDIF
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Interpolation of gaussian field failed.',JPQUIET)
INTFBP = JPROUTINE + 3
GOTO 900
ENDIF
C
GOTO 700
C
ENDIF
C
C
IF ( NOREPR .EQ. JPGAUSSIAN) THEN
C
C -> regular gaussian grid
C
CALL JAGGGP( ZNFELDI, NIRESO, PNORTH, PSOUTH, PWEST, PEAST,
X NOGAUSS, 'U', NOLPTS, ZNFLDO, IUV, IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Interpolation of gaussian field failed.',JPQUIET)
INTFBP = JPROUTINE + 4
GOTO 900
ENDIF
C
GOTO 700
C
ENDIF
C
C
IF ( NOREPR .EQ. JPQUASI) THEN
C
C -> reduced gaussian grid
CALL JAGGGP( ZNFELDI, NIRESO, PNORTH, PSOUTH, PWEST, PEAST,
X NOGAUSS, 'U', NOLPTS, ZNFLDO, IUV, IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Interpolation of gaussian field failed.',JPQUIET)
INTFBP = JPROUTINE + 4
GOTO 900
ENDIF
C
GOTO 700
C
ENDIF
C
C Dropthrough => unrecognized output field type
IERR = JPROUTINE + 1
CALL INTLOG(JP_ERROR,
X 'INTFBP: Unrecognized output field type.',NOREPR)
INTFBP = IERR
GOTO 900
C
ENDIF
C
C ------------------------------------------------------------------
C Section 5. Interpolate Gaussian grid to grid point.
C ------------------------------------------------------------------
C
500 CONTINUE
C
C Setup flags for input and output fields
KERR = 1
IF (NIREPR .EQ. JPQUASI) THEN
IERR = IRSIZE( NIGAUSS, NIAREA, MILLEN, NIWE, NINS, KILN,
X KITOTAL, RIGAUSS, OIWEGLOBE, OINPOLE, OISPOLE,
X KPR, KERR)
ELSE IF ( NIREPR .EQ. JPGAUSSIAN ) THEN
IERR = IGSIZE( NIGAUSS, NIAREA, NIWE, NINS, KILN, RIGAUSS,
X OIWEGLOBE, OINPOLE, OISPOLE, KPR, KERR)
ELSE
IERR = IGLSIZE( NIGRID, NIAREA, NIWE, NINS, KILN, OIWEGLOBE,
X OINPOLE, OISPOLE, KPR, KERR)
ENDIF
C
NONS = 0
NOWE = 0
IF (NOREPR .EQ. JPQUASI) THEN
IERR = IRSIZE( NOGAUSS, NOAREA, NOLPTS, NOWE, NONS, KOLN,
X KOTOTAL, ROGAUSS, OOWEGLOBE, OONPOLE, OOSPOLE,
X KPR, KERR)
ELSE IF ( NOREPR .EQ. JPGAUSSIAN ) THEN
IERR = IGSIZE( NOGAUSS, NOAREA, NOWE, NONS, KOLN, ROGAUSS,
X OOWEGLOBE, OONPOLE, OOSPOLE, KPR, KERR)
ELSE
IERR = IGLSIZE( NOGRID, NOAREA, NOWE, NONS, KOLN, OOWEGLOBE,
X OONPOLE, OOSPOLE, KPR, KERR)
ENDIF
C
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Setup of gaussian field flags failed.',IERR)
INTFBP = JPROUTINE + 6
GOTO 900
ENDIF
C
C
C ------------------------------------------------------------------
C Section 5.1 Interpolate reduced Gaussian grid to grid point.
C ------------------------------------------------------------------
C
510 CONTINUE
C
C
ISIZE = ISCRSZ()
IF ( ISIZE .LE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space failed.',ISIZE)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
CALL JMEMHAN( 3, IZNFLDO, ISIZE, 1, IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Get scratch space fail.',JPQUIET)
INTFBP = JPROUTINE + 2
GOTO 900
ENDIF
C
IF (NIREPR .EQ. JPQUASI) THEN
IERR = IARCNTL( ZNFELDI, JPEXPAND, ZNFLDO, ISIZE, KILN,
X OIWEGLOBE, OINPOLE, OISPOLE, KOLN, OOWEGLOBE,
X OONPOLE, OOSPOLE, KPR ,KERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Interpolation of gaussian field failed.',IERR)
INTFBP = JPROUTINE + 7
GOTO 900
ENDIF
C
GOTO 700
C
ENDIF
C
C ------------------------------------------------------------------
C* Section 6. Interpolate regular grid point to grid point.
C ------------------------------------------------------------------
C
600 CONTINUE
C
IERR = IAGCNTL( ZNFELDI, JPEXPAND, ZNFLDO, ISIZE, KILN,
X OIWEGLOBE, OINPOLE, OISPOLE, KOLN, OOWEGLOBE,
X OONPOLE, OOSPOLE, KPR, KERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFBP: Interpolation of gaussian field failed.',IERR)
INTFBP = JPROUTINE + 8
GOTO 900
ENDIF
C
C ------------------------------------------------------------------
C* Section 7. Pack field into GRIB if necessary.
C ------------------------------------------------------------------
C
700 CONTINUE
C
C Setup GRIB sections for the output product
IERR = IGSETUP( ISEC1, ISEC2, ISEC4 )
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: Setup GRIB sections failed.',IERR)
INTFBP = IERR
GOTO 900
ENDIF
C
C Code data into GRIB
C
ILENF = ISIZE
IERR = 1
C
C If grid-point output, setup for 2nd order packing if requested.
C
IF( (NOREPR.NE.JPSPHERE) .AND. (NOREPR.NE.JPSPHROT) ) THEN
HFUNC = 'C'
IF( NOHFUNC.EQ.'K' ) THEN
HFUNC = 'K'
ISEC4(4) = 64
ISEC4(6) = 16
ISEC4(9) = 32
ISEC4(10) = 16
ISEC4(12) = 8
ISEC4(13) = 4
ISEC4(14) = 0
ISEC4(15) = -1
ELSE IF( NOHFUNC.EQ.'S' ) THEN
ISEC4(4) = 0
ISEC4(6) = 0
ENDIF
ELSE
HFUNC = 'C'
IF( NOHFUNC.EQ.'C' ) THEN
ISEC2(6) = 2
ISEC4(4) = 64
ELSE IF( NOHFUNC.EQ.'S' ) THEN
ISEC2(6) = 1
ISEC4(4) = 0
ENDIF
ENDIF
C
IF( LIMISSV ) THEN
ISEC1(5) = 192
ISEC3(2) = NINT(RMISSGV)
ZSEC3(2) = RMISSGV
ENDIF
CALL GRIBEX( ISEC0, ISEC1, ISEC2, ZSEC2, ISEC3, ZSEC3, ISEC4,
X ZNFLDO,ILENF,OUTGRIB,OUTLEN,IWORD,HFUNC,IERR)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFBP: GRIBEX encoding failed.',IERR)
INTFBP = JPROUTINE + 5
GOTO 900
ENDIF
OUTLEN = IWORD
C
C ------------------------------------------------------------------
C* Section 9. Closedown.
C ------------------------------------------------------------------
C
900 CONTINUE
C
C Clear change flags for next product processing
LCHANGE = .FALSE.
LSMCHNG = .FALSE.
C
RETURN
END
|
