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#define MISSING_VALUE -9999999
PROGRAM SINGLEPT
IMPLICIT NONE
C
INTEGER JPACK, JPBYTES
PARAMETER (JPACK = 5000000)
PARAMETER (JPBYTES = 4)
C
INTEGER ISEC0(2)
INTEGER ISEC1(1024)
INTEGER ISEC2(2048)
INTEGER ISEC3(2)
INTEGER ISEC4(1024)
INTEGER INBUFF(JPACK), OUTGRIB(JPACK)
INTEGER KPTS(1024)
INTEGER NSIZE, OUTLEN
INTEGER IRET, FILE1, FILE2
INTEGER ILENB, LENOUT, IPUNP, IWORD, LOOP, LOOPO
INTEGER NLON, NLAT, NPTS, NGAUSS, NLATLON
INTEGER IFILEN, IOS, NARGS
C
REAL ZSEC2(1024)
REAL ZSEC3(2)
REAL ZSEC4(JPACK*4)
REAL USEC4(JPACK*4)
LOGICAL ASCII
CHARACTER*1 HTYPE
C
REAL AREA(4), GRID(2), POLE(2), LATS(1000), LONS(1000)
REAL PLATS(1024), REALV(4), DUMMY(1)
C
CHARACTER*10 CHARV(1)
CHARACTER*128 POINTS, INFILE, OUTFILE
C
INTEGER HRG2LL, HIRLSM, HSH2GG, INTOUT, INTF, IARGC
EXTERNAL HRG2LL, HIRLSM, HSH2GG, INTOUT, INTF
C
C Commented out for gfortran
C
CCC EXTERNAL IARGC
C
C Fix dummy grid step and Souh pole position
C
DATA GRID/1.0,1.0/
DATA POLE/-90.0,0.0/
C
C -----------------------------------------------------------------|
C Pick up the command line file names and open the files
C -----------------------------------------------------------------|
C
ASCII = .false.
NARGS = IARGC()
IF( NARGS.LT.3 ) THEN
WRITE(*,*) ' '
WRITE(*,*) 'Usage: singlePointInterpolation llfile'
X ,' infile outfile a'
WRITE(*,*) ' '
WRITE(*,*) ' latlonfile is a list of latitude/longitude values'
WRITE(*,*) ' '
WRITE(*,*) ' inpfile is a file of global GRIB fields'
WRITE(*,*) ' '
WRITE(*,*) ' outfile is a file of single-point GRIBs or ascii'
WRITE(*,*) ' '
WRITE(*,*) ' a optional ascii output'
WRITE(*,*) ' '
STOP 'FAIL'
ENDIF
C
CALL GETARG(1,POINTS)
CALL GETARG(2,INFILE)
CALL GETARG(3,OUTFILE)
if(NARGS.eq.4) ASCII = .TRUE.
C
C Open the input GRIB file
C
IFILEN = INDEX(INFILE,' ') - 1
CALL PBOPEN(FILE1, INFILE (1:IFILEN), "r", IRET)
IF( IRET.NE.0 ) THEN
WRITE(*, *) 'Return code from PBOPEN = ',IRET
CALL PBCLOSE(FILE1, IRET)
STOP 'Fault in PBOPEN for input file'
ENDIF
C
C Open the output file of single-point GRIBs
C
IFILEN = INDEX(OUTFILE,' ') - 1
IF(ASCII) THEN
OPEN (UNIT=16,FILE=OUTFILE(1:IFILEN)//'.txt',STATUS='UNKNOWN',
& FORM='FORMATTED',IOSTAT=IOS)
IF (IOS.EQ.0) THEN
WRITE(*,*)'File:',OUTFILE(1:IFILEN),' opened'
ELSE
WRITE(*,*)'File:',OUTFILE(1:IFILEN),' not opened'
WRITE(*,*)'Input/output status = ',IOS
WRITE(*,*)'Program will stop'
STOP
END IF
END IF
CALL PBOPEN(FILE2, outfile, "w", IRET)
IF( IRET.NE.0 ) THEN
WRITE (*, *) 'Return code from PBOPEN = ',IRET
STOP 'Fault in PBOPEN for output file'
ENDIF
C
C Open the file of lat/longs
C
IFILEN = INDEX(POINTS,' ') - 1
OPEN(UNIT=1,FILE=POINTS(1:IFILEN),STATUS='OLD'
X ,FORM='FORMATTED',ERR=990)
C
C Read the latitude/longitude pairs
C
NLATLON = 0
DO LOOP = 1, 1000
READ(1,9000,ERR=980,END=110) LATS(LOOP), LONS(LOOP)
IF( (LATS(LOOP).GT.90.0).OR.(LATS(LOOP).LT.-90.0) ) THEN
WRITE (*, *) 'Latitude ',LOOP,' is faulty (',LATS(LOOP),')'
STOP 'FAIL'
ENDIF
c WRITE (*,9000) LATS(LOOP), LONS(LOOP)
C
IF( (LONS(LOOP).GT.360.0).OR.(LONS(LOOP).LT.-360.0) ) THEN
WRITE (*, *) 'Longitude ',LOOP,' is faulty (',LONS(LOOP),')'
STOP 'FAIL'
ENDIF
C
NLATLON = NLATLON + 1
C
ENDDO
C
110 CONTINUE
CLOSE(UNIT=1)
IF( NLATLON.LT.1 ) STOP 'No latitude/longitude pairs given'
C
WRITE(*,*) 'Number of latitude/longitude pairs = ', NLATLON
C
C -----------------------------------------------------------------|
C Read the input GRIB fields one at a time and generate an
C interpolated value at each latitude/longitude point.
C -----------------------------------------------------------------|
C
150 CONTINUE
C
C Read next GRIB field.
C
ILENB = JPACK*JPBYTES
CALL PBGRIB(FILE1, INBUFF, ILENB, LENOUT, IRET )
IF( IRET.LT.0 ) THEN
IF( IRET.NE.-1 ) WRITE (*, *) 'Return code from PBGRIB = ',IRET
C
IF( IRET.EQ.-1 ) THEN
CALL PBCLOSE(FILE2, IRET)
IF( IRET.LT.0 ) THEN
WRITE(*, *) 'Return code from PBCLOSE = ',IRET
WRITE(*, *) 'Fault in PBCLOSE for output file'
ENDIF
C
CALL PBCLOSE(FILE1, IRET)
STOP 'Interpolation completed'
ELSE
CALL PBCLOSE(FILE1, IRET)
STOP 'Fault in PBCLOSE for input file'
ENDIF
ENDIF
C
C Unpack the GRIB message.
C
ZSEC3(2) = MISSING_VALUE
ISEC3(2) = NINT(ZSEC3(2))
IRET = 1
IPUNP = JPACK * JPBYTES
ILENB = (LENOUT + (JPBYTES-1))/JPBYTES
CALL GRIBEX(ISEC0,ISEC1,ISEC2,ZSEC2,ISEC3,ZSEC3,ISEC4,
X ZSEC4,IPUNP,INBUFF,ILENB,IWORD,'D',IRET)
IF( IRET.GT.0 ) THEN
WRITE(*,*) 'GRIBEX return code = ',IRET
STOP 'GRIBEX error in decoding'
ENDIF
C
C If the input GRIB field is spectral, convert to a suitable
C gaussian grid before interpolation
C
IF( ISEC2(1).EQ.50 ) THEN
C
NGAUSS = 0
HTYPE = ''
IRET = HSH2GG(0,0,ISEC2(2),NGAUSS,HTYPE,KPTS,PLATS,NSIZE)
IF( IRET.NE.0 ) THEN
WRITE(*,*) 'Failed to find suitable gaussian grid for the'
WRITE(*,*) 'spectral input GRIB'
STOP 'FAIL'
ENDIF
C
IRET = INTOUT('REDUCED',NGAUSS,REALV,CHARV)
IF( IRET.NE.0 ) THEN
WRITE(*,*) 'Failed to setup gaussian grid interpolation'
STOP 'FAIL'
ENDIF
C
OUTLEN = JPACK
IRET = INTF(INBUFF,ILENB,DUMMY,OUTGRIB,OUTLEN,DUMMY)
IF( IRET.NE.0 ) THEN
WRITE(*,*) 'Gaussian grid interpolation failed'
STOP 'FAIL'
ENDIF
C
C Unpack the interpolated GRIB message.
C
ZSEC3(2) = MISSING_VALUE
ISEC3(2) = NINT(ZSEC3(2))
IRET = 1
IPUNP = JPACK * JPBYTES
ILENB = (LENOUT + (JPBYTES-1))/JPBYTES
CALL GRIBEX(ISEC0,ISEC1,ISEC2,ZSEC2,ISEC3,ZSEC3,ISEC4,
X ZSEC4,IPUNP,OUTGRIB,OUTLEN,IWORD,'D',IRET)
IF( IRET.GT.0 ) THEN
WRITE(*,*) 'GRIBEX return code = ',IRET
STOP 'GRIBEX error in decoding'
ENDIF
ENDIF
C
C Interpolate the gaussian field to lat/long
C
NGAUSS = ISEC2(10)
NPTS = ISEC4(1)
C
C Loop through the latitude/longitude points
C
DO LOOPO = 1, NLATLON
AREA(1) = LATS(LOOPO)
AREA(2) = LONS(LOOPO)
AREA(3) = LATS(LOOPO)
AREA(4) = LONS(LOOPO)
C
IRET = HIRLSM(.TRUE.,ZSEC4,NPTS,NGAUSS,AREA,POLE,GRID,USEC4,1,
X NLON,NLAT)
IF( IRET.NE.0 )
X STOP 'Interpolation from gaussian grid to lat/lon grid failed'
C
IF(ASCII) THEN
WRITE (16,9001)LOOPO, LATS(LOOPO), LONS(LOOPO), USEC4(1)
ENDIF
C Repack the field and write to results file
C
IRET = 1
IPUNP = ISEC4(1)
ILENB = JPACK
DO LOOP = 1, ILENB
INBUFF(LOOP) = 0
ENDDO
C
C Setup output GRIB header information
C
ISEC2( 1) = 0
ISEC2( 2) = 1
ISEC2( 3) = 1
ISEC2( 4) = NINT(LATS(LOOPO)*1000)
ISEC2( 5) = NINT(LONS(LOOPO)*1000)
ISEC2( 6) = 128
ISEC2( 7) = NINT(LATS(LOOPO)*1000)
ISEC2( 8) = NINT(LONS(LOOPO)*1000)
ISEC2( 9) = 1000
ISEC2(10) = 1000
ISEC2(11) = 0
ISEC2(12) = 0
ISEC2(13) = 0
ISEC2(14) = 0
ISEC2(15) = 0
ISEC2(16) = 0
ISEC2(17) = 0
ISEC2(18) = 0
ISEC2(19) = 0
C
ZSEC3(2) = MISSING_VALUE
ISEC3(2) = NINT(ZSEC3(2))
C
ISEC4( 1) = 1
C
CALL GRIBEX(ISEC0,ISEC1,ISEC2,ZSEC2,ISEC3,ZSEC3,ISEC4,
X USEC4,IPUNP,INBUFF,ILENB,IWORD,'C',IRET)
IF( IRET.GT.0 ) THEN
WRITE(*,*) 'GRIBEX return code = ',IRET
STOP 'GRIBEX error on packing'
ENDIF
C
LENOUT = ISEC0(1)
CALL PBWRITE(FILE2, INBUFF, LENOUT, IRET)
IF( IRET.LT.LENOUT ) THEN
WRITE(*, *) 'Return code from PBWRITE = ',IRET
STOP 'Fault in PBWRITE'
ENDIF
C
ENDDO
C
C Go for next input GRIB field
C
GOTO 150
C
C -----------------------------------------------------------------|
C Problem reports
C -----------------------------------------------------------------|
C
980 STOP 'READ error for lat/long file'
C
990 STOP 'OPEN error for lat/long file'
C
9000 FORMAT(2(F8.2,1X))
9001 FORMAT(1x,i5,2x,2(F8.2,1X),f8.2)
END
|
