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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 INTVECT(PUFIELD,PVFIELD,KASIZE,
X KUGRIB,KVGRIB,OUTLEN)
C
C---->
C**** INTVECT
C
C Purpose
C -------
C Interpolate U or V component fields to grid point.
C
C
C Interface
C ---------
C IRET = INTVECT(PUFIELD,PVFIELD,KASIZE,
C X KUGRIB,KVGRIB,OUTLEN)
C
C Input
C -----
C PUFIELD - U values.
C PVFIELD - V values.
C KASIZE - Size of input arrays
C
C
C Output
C ------
C KUGRIB - Output wind U component field (GRIB format).
C KVGRIB - Output wind V component field (GRIB format).
C OUTLEN - Output U field length (words).
C
C
C Method
C ------
C None.
C
C
C Externals
C ---------
C RESET_C - Reset interpolation handling options using GRIB product.
C IBASINI - Ensure basic interpolation setup is done.
C ISCRSZ - Calculate number of values in generated field.
C INTUVDH - Encode/decode data into/from GRIB code.
C INTFAU - Prepare to interpolate unpacked input field.
C INTFBU - Interpolate unpacked input field.
C INTLOG - Log error message.
C MKFRAME - Create a 'frame' from a rectangular field.
C INTUVGH - Interpolate GRIB U and V reduced gaussian to rotated GRIB
C U and V.
C
C
C Author
C ------
C J.D.Chambers ECMWF September 2004
C
C
C----<
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "intf.h"
#include "current.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 40170 )
C
C Function arguments
C
INTEGER KPARAM, KASIZE, KUGRIB(*), KVGRIB(*), OUTLEN
REAL PUFIELD(KASIZE), PVFIELD(KASIZE)
C
C Local variables
C
LOGICAL LFRAME, LOLDWIND, LOMISSV
INTEGER NPARAM, IRET, ILENF, NTRUNC, NGAUSS, ISIZE, NCOUNT
INTEGER NUVFLAG, NLON, NLAT, NBYTES, NSIZE
INTEGER ISZVD, IHOLD, ISAME
INTEGER IN_U, IN_V
REAL DUMMY
REAL AREA(4), GRID(2), POLE(2), EAST, WEST
CHARACTER*1 HOLDTYP
INTEGER LOOP
INTEGER OUTLENO
C
REAL RGGRID, SWORK, TWORK
POINTER (IRGGRID, RGGRID(1) )
POINTER (ISWORK, SWORK(1) )
POINTER (ITWORK, TWORK(1) )
C
INTEGER KPTS(JPGTRUNC*2)
REAL GLATS(JPGTRUNC*2)
LOGICAL LFIRST, LNEWUV, LSPECUV
CHARACTER*3 EXTRA
C
C Externals
C
INTEGER FIXAREA, INTFAU, INTFBU, INTUVDH, HSP2GG, IBASINI
INTEGER HIRLAMW, ISCRSZ, RESET_C, INSANE, INTUVGH
C
DATA IRGGRID/-1/, ISWORK/-1/, ITWORK/-1/
SAVE IRGGRID, ISWORK, ITWORK
DATA LFIRST/.TRUE./, LNEWUV/.TRUE./, EXTRA/'NO '/
SAVE LFIRST, LNEWUV
C
C -----------------------------------------------------------------|
C* Section 1. Initialise.
C -----------------------------------------------------------------|
C
100 CONTINUE
C
INTVECT = 0
IF( LFIRST ) THEN
CALL GETENV('IGNORE_UV_EXTRA_MODE', EXTRA)
IF((EXTRA(1:1).EQ.'Y').OR.(EXTRA(1:1).EQ.'y')) LNEWUV = .FALSE.
IF( LNEWUV ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTVECT: IGNORE_UV_EXTRA_MODE not turned on',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'INTVECT: IGNORE_UV_EXTRA_MODE turned on',JPQUIET)
ENDIF
LFIRST = .FALSE.
ENDIF
C
LOLDWIND = LWINDSET
C
C Ensure that basic initialisation has been done
C
IRET = IBASINI(0)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: basic initialise failed',JPQUIET)
INTVECT = IRET
GOTO 900
ENDIF
C
C Unpack GRIB sections 1 and 2.
C
ISZVD = 1
IRET = INTUVDH(DUMMY,ISZVD,PUFIELD,KASIZE,'J',IN_U)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: GRIB header decode failed',IRET)
INTVECT = IRET
GOTO 900
ENDIF
NSIZE = ISEC4(1)
NIREPR = ISEC2(1)
LSPECUV = (NIREPR.EQ.JPSPHERE).OR.(NIREPR.EQ.JPSPHROT)
IF( LSPECUV ) NIRESO = ISEC2(2)
C
C Setup interpolation options from input GRIB characteristics.
C
IRET = RESET_C(ISEC1, ISEC2, ZSEC2, ISEC4)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Setup interp. options from GRIB failed.',JPQUIET)
INTVECT = IRET
GOTO 900
ENDIF
C
C Only allowed rotations are:
C - spectral to regular lat/long
C - reduced gaussian to regular lat/long
C
IF( LNOROTA ) THEN
IF( ((NOREPR.NE.JPREGROT).AND.(NOREPR.NE.JPREGULAR)).OR.
X ((NIREPR.NE.JPSPHERE).AND.(NIREPR.NE.JPQUASI)) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: For vector fields, only allowed rotations are:',
X JPQUIET)
CALL INTLOG(JP_ERROR,
X 'INTVECT: spectral to regular lat/long, or',JPQUIET)
CALL INTLOG(JP_ERROR,
X 'INTVECT: reduced gaussian to regular lat/long',JPQUIET)
INTVECT = JPROUTINE + 1
GOTO 900
ENDIF
ENDIF
C
C Check that no outrageous values given for interpolation
C
ISAME = INSANE()
IF( (ISAME.GT.0).AND.(ISAME.NE.27261) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Interpolation cannot use given values.',JPQUIET)
INTVECT = ISAME
GOTO 900
ENDIF
C
LFRAME = LNOFRAME.AND.
X ((NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPGAUSSIAN).OR.
X (NOREPR.EQ.JPREGROT ).OR.(NOREPR.EQ.JPFGGROT ) )
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,'INTVECT: area fixup failed',JPQUIET)
INTVECT = 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
IF( LNOROTA ) THEN
POLE(1) = REAL(NOROTA(1))/PPMULT
POLE(2) = REAL(NOROTA(2))/PPMULT
CALL INTLOG(JP_DEBUG,'INTVECT: Rotate the U & V fields',JPQUIET)
CALL INTLOG(JP_DEBUG,'INTVECT: South pole lat ',NOROTA(1))
CALL INTLOG(JP_DEBUG,'INTVECT: South pole long ',NOROTA(2))
ELSE
NOROTA(1) = -9000000
NOROTA(2) = 0
ENDIF
C
IF( .NOT. LSPECUV ) GOTO 500
C
C Get some scratch memory for the U and V fields
C
ILENF = NSIZE
ISIZE = ILENF * 2
CALL JMEMHAN( 11, ISWORK, NSIZE*2, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: memory alloc for scratch memory failed',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
C Unpack U field
C
NIFORM = 0
NIPARAM = IN_U
LWIND = .TRUE.
LOLDWIND = LWINDSET
LWINDSET = .TRUE.
C
IRET = INTUVDH(SWORK,NSIZE,PUFIELD,KASIZE,'D',NIPARAM)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: Vorticity decoding failed',IRET)
INTVECT = IRET
GOTO 900
ENDIF
IN_U = ISEC1(6)
C
C Unpack V field
C
NIPARAM = IN_V
C
IRET = INTUVDH(SWORK(1+NSIZE),NSIZE,PVFIELD,KASIZE,'D',NIPARAM)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: Vorticity decoding failed',IRET)
INTVECT = IRET
GOTO 900
ENDIF
IN_V = ISEC1(6)
C
IF( LNOROTA ) GOTO 300
C
C -----------------------------------------------------------------|
C* Section 2. Spectral to grid-point with no rotation
C -----------------------------------------------------------------|
C
200 CONTINUE
C
CALL INTLOG(JP_DEBUG,
X 'INTVECT: Interpolate U & V fields with no rotation',JPQUIET)
C
CALL JMEMHAN( 18, ITWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: memory alloc for scratch memory failed',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
C Interpolate U field
C
IRET = INTFAU(SWORK, NSIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Prepare to interpolate failed.',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
IRET = INTFBU(SWORK, NSIZE, TWORK, ILENF)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: Interpolation failed.',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
C Interpolate V field
C
IRET = INTFAU(SWORK(1+NSIZE),NSIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Prepare to interpolate failed.',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
IRET = INTFBU(SWORK(1+NSIZE),NSIZE, TWORK(1+ILENF), ILENF)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTVECT: Interpolation failed.',JPQUIET)
INTVECT = JPROUTINE + 2
GOTO 900
ENDIF
C
GOTO 700
C
C -----------------------------------------------------------------|
C* Section 3. Spectral to grid-point with rotation
C -----------------------------------------------------------------|
C
300 CONTINUE
C
IF( .NOT.LUSEHIR ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT : Unable to rotate spectral U or V:',JPQUIET)
INTVECT = JPROUTINE + 3
GOTO 900
ENDIF
C
C Convert spectral to suitable global reduced gaussian
C
NTRUNC = NIRESO
IRET = HSP2GG(NTRUNC,NGAUSS,KPTS,GLATS,ISIZE)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: problem getting data for reduced grid',NTRUNC)
INTVECT = JPROUTINE + 4
GOTO 900
ENDIF
NCOUNT = ISIZE
C
C Dynamically allocate memory for global reduced gaussian grid
C
CALL JMEMHAN( 18, IRGGRID, (NCOUNT*2), 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: memory alloc for reduced grid fail',JPQUIET)
INTVECT = JPROUTINE + 4
GOTO 900
ENDIF
C
C Set flag to show field is a wind component
C
NUVFLAG = 1
C
C Create the reduced gaussian grid
C
HOLDTYP = HOGAUST
WEST = 0.0
EAST = 360.0 - (360.0/(NGAUSS*4))
C
C U component spectral -> reduced gaussian
C
CALL JAGGGP(SWORK,NTRUNC,GLATS(1),GLATS(NGAUSS*2),WEST,
X EAST,NGAUSS,'R',KPTS,RGGRID,NUVFLAG,IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: spectral to reduced gaussian failed',JPQUIET)
INTVECT = JPROUTINE + 4
GOTO 900
ENDIF
C
HOGAUST = HOLDTYP
C
C V component spectral -> reduced gaussian
C
CALL JAGGGP(SWORK(1+NSIZE),NTRUNC,GLATS(1),GLATS(NGAUSS*2),WEST,
X EAST,NGAUSS,'R',KPTS,RGGRID(1+NCOUNT),NUVFLAG,IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: spectral to reduced gaussian failed',JPQUIET)
INTVECT = JPROUTINE + 4
GOTO 900
ENDIF
C
HOGAUST = HOLDTYP
C
C Rotate using 12-point horizontal interpolation
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
ILENF = NLON * NLAT
ISIZE = ILENF * 2
CALL JMEMHAN( 17, ITWORK, ISIZE, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: memory alloc for lat/long grid fail',JPQUIET)
INTVECT = JPROUTINE + 6
GOTO 900
ENDIF
C
IRET = HIRLAMW(LO12PT,RGGRID,RGGRID(1+NCOUNT),NCOUNT,NGAUSS,AREA,
X POLE,GRID,TWORK,TWORK(1+ILENF),ILENF,NLON,NLAT)
C
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: HIRLAMW rotation failed',JPQUIET)
INTVECT = JPROUTINE + 6
GOTO 900
ENDIF
C
C Set the components flag for rotated U and V coefficients
C
ISEC2(19) = 8
NOWE = NLON
NONS = NLAT
C
GOTO 700
C
C -----------------------------------------------------------------|
C* Section 5. Reduced gaussian to grid-point
C -----------------------------------------------------------------|
C
500 CONTINUE
C
INTVECT =
X INTUVGH(PUFIELD,PVFIELD,KASIZE,KUGRIB,KVGRIB,OUTLEN,OUTLEN)
C
GOTO 900
C
C -----------------------------------------------------------------|
C* Section 7. Pack the fields into GRIB format
C -----------------------------------------------------------------|
C
700 CONTINUE
C
C Reset the input format flag
C
NIFORM = 1
C
C If a 'frame' has been specified, build the frame
C
IF( LFRAME ) THEN
LOMISSV = LIMISSV
LIMISSV = .TRUE.
CALL MKFRAME(NLON,NLAT,TWORK,RMISSGV,NOFRAME)
CALL MKFRAME(NLON,NLAT,TWORK(1+ILENF),RMISSGV,NOFRAME)
ENDIF
C
OUTLENO = OUTLEN
IRET = INTUVDH(TWORK,ILENF,KUGRIB,OUTLEN,'C',IN_U)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Wind component into GRIB encoding fail',IRET)
INTVECT = JPROUTINE + 7
GOTO 900
ENDIF
C
OUTLEN = OUTLENO
IRET = INTUVDH(TWORK(1+ILENF),ILENF,KVGRIB,OUTLEN,'C',IN_V)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTVECT: Wind component into GRIB encoding fail',IRET)
INTVECT = JPROUTINE + 7
GOTO 900
ENDIF
C
IF( LFRAME ) LIMISSV = LOMISSV
C
C -----------------------------------------------------------------|
C* Section 9. Return
C -----------------------------------------------------------------|
C
900 CONTINUE
C
RETURN
END
|
