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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 INTWAVU(INFLD,INLEN,OUTFLD,OUTLEN)
C
C---->
C**** INTWAVU
C
C Purpose
C -------
C
C Interpolate an ECMWF wave field wave field or a reduced
C latitude-longitude field
C
C
C Interface
C ---------
C
C IRET = INTWAVU(INFLD,INLEN,OUTFLD,OUTLEN)
C
C Input
C -----
C
C INFLD - Input field (packed).
C INLEN - Input field length (words).
C
C
C Output
C ------
C
C OUTFLD - Output field (packed).
C OUTLEN - Output field length (words).
C
C
C Method
C ------
C
C Call interpolation routine; then repack into GRIB format.
C
C
C Externals
C ---------
C
C FIXAREA - Fixup area definition to correspond to grid definitions
C JMEMHAN - Handles memory allocation.
C JDEBUG - Checks environment to switch on/off debug
C INTLOG - Log error message.
C WAVEXX2 - Interpolate wave fields (except 2D spectra)
C WV2DXX2 - Interpolate wave 2D spectra fields
C MKFRAME - Create a 'frame' from a rectangular field
C MKBITMP - Apply a bitmap to a rectangular field
C
C
C Author
C ------
C
C S.Curic ECMWF Mar 2009
C
C
C----<
C
IMPLICIT NONE
C
C Function arguments
INTEGER INLEN,OUTLEN
REAL INFLD, OUTFLD
DIMENSION INFLD(*),OUTFLD(*)
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "intf.h"
#include "grfixed.h"
#include "jparams.h"
C
C Parameters
INTEGER JPROUTINE, JP2DSP, JP2DSPQ, JPMAXLT
PARAMETER (JPROUTINE = 40200 )
PARAMETER (JP2DSP = 250 )
C ^---- parameter number for 2D wave spectra (whole)
PARAMETER (JP2DSPQ = 251 )
C ^---- parameter number for 2D wave spectra (single)
PARAMETER (JPMAXLT = 1801 )
C
C Local variables
C
CHARACTER*1 HFUNC
REAL ZMISS
REAL RLATINC, ONORTH, OSOUTH
INTEGER IWORD, IRET, ISIZE, NSPEC, LAT1, LOOP, IERR
INTEGER KNUM, NUM_E_W, NUM_N_S, NFULLNS, NFULLEW
REAL GRIDWE, GRIDNS, NORTH, SOUTH, WEST, EAST
REAL INORTH, ISOUTH, IWEST, IEAST, RNS
INTEGER NUMPTS,MISSLAT,KOLDNUM
DIMENSION NUMPTS(JPMAXLT)
INTEGER NUMTABL, NUMPROD
LOGICAL LCOEFFS, L98WAVE, LFRAME, LBITMP
LOGICAL LDEBUG
C
C Externals
INTEGER AREACHK, FIXAREA, WAVEXX2, WV2DXX2
INTEGER NUMPTNS, NUMPTWE, JNORSGG, MKBITMP
C
C ------------------------------------------------------------------
C Section 1. Initialise
C ------------------------------------------------------------------
C
100 CONTINUE
C
INTWAVU = 0
C
LCOEFFS = .FALSE.
C
C Check if debug option turned on
CALL JDEBUG()
LDEBUG = NDBG.GT.0
C
ZMISS = RMISSGV
C
IRET = 1
C
C Check that the field can be handled
C
C ------------------------------------------------------------------
C Section 2. Sort out interpolation area.
C ------------------------------------------------------------------
C
200 CONTINUE
C
NSPEC = 1
INORTH = FLOAT(NIAREA(1))/PPMULT
IWEST = FLOAT(NIAREA(2))/PPMULT
ISOUTH = FLOAT(NIAREA(3))/PPMULT
IEAST = FLOAT(NIAREA(4))/PPMULT
KNUM = NINS
RNS = INORTH - ISOUTH
C
C Adjust (sub-)area limits to suit the grid
C
IRET = FIXAREA()
IF ( IRET .NE. 0 ) THEN
CALL INTLOG(JP_ERROR, 'INTWAVU: FIXAREA failed.',JPQUIET)
INTWAVU = JPROUTINE + 5
GOTO 900
ENDIF
NORTH = FLOAT(NOAREA(1))/PPMULT
WEST = FLOAT(NOAREA(2))/PPMULT
SOUTH = FLOAT(NOAREA(3))/PPMULT
EAST = FLOAT(NOAREA(4))/PPMULT
C
C Calculate the number of points E-W and N-S in new grid area
C
IF( (NOREPR.EQ.JPQUASI) .OR. (NOREPR.EQ.JPGAUSSIAN)) THEN
GRIDWE = NOGAUSS
GRIDNS = 0
ELSE IF( NOREPR.EQ.JPREDLL ) THEN
GRIDWE = 360.0/NOLPTS((NOREDLL/2)+1)
GRIDNS = FLOAT(NOGRID(2))/PPMULT
ELSE
GRIDWE = FLOAT(NOGRID(1))/PPMULT
GRIDNS = FLOAT(NOGRID(2))/PPMULT
ENDIF
C
IRET = AREACHK(GRIDWE,GRIDNS,NORTH,WEST,SOUTH,EAST)
IF( IRET.NE.0 ) THEN
INTWAVU = JPROUTINE + 6
GOTO 900
ENDIF
NOAREA(1) = NINT(NORTH*PPMULT)
NOAREA(2) = NINT(WEST*PPMULT)
NOAREA(3) = NINT(SOUTH*PPMULT)
NOAREA(4) = NINT(EAST*PPMULT)
C
IF( (NOREPR.EQ.JPQUASI) .OR. (NOREPR.EQ.JPGAUSSIAN)) THEN
GRIDWE = 360.0/NOLPTS(NOGAUSS)
NUM_E_W = NUMPTWE(WEST,EAST,GRIDWE)
NFULLEW = NUMPTWE(0.0,360.0,GRIDWE) - 1
NUM_N_S = JNORSGG(SOUTH,ROGAUSS,NOGAUSS,1) -
X JNORSGG(NORTH,ROGAUSS,NOGAUSS,0) + 1
NFULLNS = NOGAUSS*2
ELSE IF( NOREPR.EQ.JPREDLL ) THEN
NUM_E_W = NUMPTWE(WEST,EAST,GRIDWE)
NFULLEW = NUMPTWE(0.0,360.0,GRIDWE) - 1
NUM_N_S = NUMPTNS(NORTH,SOUTH,GRIDNS)
NFULLNS = NOREDLL
ELSE
NUM_E_W = NUMPTWE(WEST,EAST,GRIDWE)
NFULLEW = NUMPTWE(0.0,360.0,GRIDWE) - 1
NUM_N_S = NUMPTNS(NORTH,SOUTH,GRIDNS)
NFULLNS = NUM_N_S
cs calculate outlen for regular lat-lon
OUTLEN = NUM_E_W*NUM_N_S
ENDIF
NOWE = NUM_E_W
NONS = NUM_N_S
C
C
C ------------------------------------------------------------------
C Section 3. Interpolate wave fields other than 2D spectra.
C ------------------------------------------------------------------
C
300 CONTINUE
C
C Handle if not 2D spectra ..
C
IF( (NIPARAM.NE.JP2DSP).AND.(NIPARAM.NE.JP2DSPQ) ) THEN
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTWAVU: Interpolate wave fields other than 2D spectra',JPQUIET)
ENDIF
C--------------------------------------------------------------------
KNUM = NINS
IF(NIREPR.EQ.JPREDLL) THEN
C
C Input field is a reduced latitude/longitude grid
C
C .. but it may be 'pseudo-gaussian' in layout
C (ie global, symmetric about the equator but no latitude
C at the equator)
MISSLAT = 0
ONORTH = FLOAT(NIAREA(1))/PPMULT
OSOUTH = FLOAT(NIAREA(3))/PPMULT
RLATINC = FLOAT(NIGRID(2))/PPMULT
IF( ( NIAREA(1).NE.90000).AND.(MOD(KNUM,2).EQ.0) ) THEN
C
DO LOOP = 1, KNUM
NUMPTS(LOOP) = MILLEN(LOOP)
ENDDO
C
ELSE
C
cs MISSLAT = (90000 - NIAREA(1))/NIGRID(2)
MISSLAT = (90.0 - ONORTH)/RLATINC
DO LOOP = 1, MISSLAT
NUMPTS(LOOP) = 0
ENDDO
cs KOLDNUM = 1 + (90000 - NIAREA(3))/NIGRID(2)
KOLDNUM = 1 + NINT((90.0 - OSOUTH)/RLATINC)
DO LOOP = 1, (KOLDNUM-MISSLAT)
NUMPTS(LOOP+MISSLAT) = MILLEN(LOOP)
ENDDO
DO LOOP = (KOLDNUM+1), KNUM
NUMPTS(LOOP) = 0
ENDDO
ENDIF
ENDIF
C--------------------------------------------------------------------
C
C Interpolate the field
C
IRET = WAVEXX2(NIPARAM,KNUM,NUMPTS,NUM_N_S,GRIDNS,GRIDWE,INFLD,
X OUTFLD,NORTH,WEST,ZMISS)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTWAVU: Interpolation failed.',JPQUIET)
INTWAVU = JPROUTINE + 10
GOTO 900
ENDIF
C
C ------------------------------------------------------------------
C Section 4. Interpolate wave 2D spectra field.
C ------------------------------------------------------------------
C
ELSE
C
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTWAVU: Interpolate wave 2D spectra field',JPQUIET)
ENDIF
400 CONTINUE
C
IRET = WV2DXX2(NIMATR,KNUM,MILLEN,NUM_N_S,GRIDNS,GRIDWE,INFLD,
X OUTFLD,NORTH,WEST,ZMISS)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTWAVU: Interpolation failed.',JPQUIET)
INTWAVU = JPROUTINE + 13
GOTO 900
ENDIF
C
ENDIF
C
C ------------------------------------------------------------------
C Section 5. Frame and Bitmap
C ------------------------------------------------------------------
C
500 CONTINUE
C If a 'bitmap' has been specified, build the bitmap
C
LBITMP = LNOBITMP.AND.
X ((NOREPR.EQ.JPREGROT).OR.(NOREPR.EQ.JPREGULAR).OR.
X (NOREPR.EQ.JPGAUSSIAN))
IF( LBITMP ) THEN
CALL INTLOG(JP_DEBUG,'INTWAVU: MKBITMP is enabled',JPQUIET)
IERR = MKBITMP(NUM_E_W,NUM_N_S,OUTFLD,ZMISS)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTFB: Problem applying bitmap',JPQUIET)
GOTO 900
ENDIF
ENDIF
C If a 'frame' has been specified, build the frame
C
LFRAME = LNOFRAME.AND.
X ((NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPGAUSSIAN).OR.
X (NOREPR.EQ.JPREGROT ).OR.(NOREPR.EQ.JPFGGROT ) )
CALL INTLOG(JP_DEBUG,'INTWAVU: NUM_E_W ',NUM_E_W)
CALL INTLOG(JP_DEBUG,'INTWAVU: NUM_N_S ',NUM_N_S)
IF( LFRAME ) THEN
CALL INTLOG(JP_DEBUG,'INTWAVU: MKFRAME is enabled',JPQUIET)
CALL INTLOG(JP_DEBUG,'INTWAVU: NOFRAME ',NOFRAME)
CALL MKFRAME(NUM_E_W,NUM_N_S,OUTFLD,ZMISS,NOFRAME)
ENDIF
C
C
C ------------------------------------------------------------------
C* Section 9. Closedown.
C ------------------------------------------------------------------
C
900 CONTINUE
C
C Clear change flags for next product processing
C
LCHANGE = .FALSE.
LSMCHNG = .FALSE.
C
RETURN
END
|
