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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 INTF( INGRIB,INLEN,FLDIN,OUTGRIB,OUTLEN,FLDOUT)
C
C---->
C**** INTF
C
C Purpose
C -------
C
C Interpolate input field...
C
C
C Interface
C ---------
C
C IRET = INTF( INGRIB,INLEN,FLDIN,OUTGRIB,OUTLEN,FLDOUT)
C
C Input
C -----
C
C INGRIB - Input field (packed).
C INLEN - Input field length (words).
C FLDIN - Input field (unpacked).
C
C
C Output
C ------
C
C OUTGRIB - Output field (packed).
C OUTLEN - Output field length (words).
C FLDOUT - Output field (unpacked).
C
C
C Method
C ------
C
C Call interpolation routines.
C
C
C Externals
C ---------
C
C IBASINI - Ensure basic interpolation setup is done.
C INSANE - Ensure no outrageous values given for interpolation.
C PDDEFS - Setup interpolation using parameter dependent options.
C PRECIP - Says if field is to have 'precipitation' treatment
C INTFAU - Prepare to interpolate unpacked input field.
C INTFAP - Prepare to interpolate packed input field.
C HNTFAU - Prepare to interpolate unpacked input field (using
C Hirlam 12-point for rotations).
C HNTFAP - Prepare to interpolate packed input field (using
C Hirlam 12-point for rotations).
C INTFB - Interpolate input field.
C INTLOG - Log error message.
C JDEBUG - Checks environment to switch on/off debug
C INTWAVE - Interpolate quasi-regular lat/long wave field
C to a regular lat/long field.
C OCEANP - Interpolate GRIB ocean field.
C RESET_C - Reset interpolation handling options using GRIB product.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF Aug 1994
C
C----<
C
IMPLICIT NONE
C
C Function arguments
C
INTEGER INGRIB(*),OUTGRIB(*),INLEN,OUTLEN
REAL FLDIN(*),FLDOUT(*)
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 26000 )
C
C Local variables
C
INTEGER IWORD, IRET, IORIGLN, ISAME
INTEGER LOOP, IIHOLD, IOHOLD
DIMENSION IIHOLD(4), IOHOLD(4)
INTEGER NUMTABL, NUMPROD
LOGICAL L98WAVE, LUNROT
CHARACTER*6 YFLAG
INTEGER IOS
C
C Externals
C
INTEGER IBASINI, PDDEFS, INSANE
INTEGER INTFAU, INTFAP, INTFB, HNTFAU, HNTFAP
INTEGER INTWAVE2,INTWAVE,INTWAVU, OCEANP, OCEANU, RESET_C
LOGICAL PRECIP
C
C -----------------------------------------------------------------|
C* Section 1. Initialise
C -----------------------------------------------------------------|
C
100 CONTINUE
C
INTF = 0
IRET = 0
IORIGLN = OUTLEN
NOMISS = 0
LUNROT = .FALSE.
OUTLROT = 0
C
C Save input and output area definitions
C
DO 110 LOOP = 1, 4
IIHOLD(LOOP) = NIAREA(LOOP)
IOHOLD(LOOP) = NOAREA(LOOP)
110 CONTINUE
C
C Check if debug option turned on
C
CALL JDEBUG()
C
C If the input is a set of U and V rotated lat/long fields,
C set return length to zero and do not copy input to output
C
IF( (NIREPR.EQ.JPREGULAR).AND.LWIND.AND.LNOROTA ) THEN
OUTLEN = 0
IRET = 0
CALL INTLOG(JP_DEBUG,
X 'INTF: Input U and V rotated lat/long fields ...',JPQUIET)
CALL INTLOG(JP_DEBUG,
X 'INTF: ... no further interpolation has been done',JPQUIET)
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 2. Prepare to interpolate input field.
C -----------------------------------------------------------------|
C
200 CONTINUE
C
C Ensure that basic initialisation has been done
C
IRET = IBASINI(0)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTF: basic initialisation fail.',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
C
C Allocate work array ZNFELDI if not already done.
C
IF( NIFORM.EQ.1 ) THEN
IF( IZNJDCI.NE.1952999238 ) THEN
CALL JMEMHAN( 19, IZNFLDI, JPEXPAND, 1, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_WARN,'INTF: ZNFELDI allocation fail',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
IZNJDCI = 1952999238
ENDIF
C
C Unpack the field headers for packed input.
C
CALL INTLOG(JP_DEBUG, 'INTF: Unpack GRIB headers.',JPQUIET)
IRET = 1
IWORD = 0
CALL GRIBEX(ISEC0, ISEC1, ISEC2, ZSEC2, ISEC3, ZSEC3, ISEC4,
X ZNFELDI, JPEXPAND, INGRIB, INLEN, IWORD, 'J',IRET)
C
IF( (IRET.NE.0).AND.(IRET.NE.811) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTF: Failed to unpack GRIB heders.',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
C
C Reset interpolation handling options using GRIB values.
C
IRET = RESET_C( ISEC1, ISEC2, ZSEC2, ISEC4)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_WARN,
X 'INTF: Setup of interp. options from GRIB failed',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
C end of NIFORM = 1
ENDIF
C
C Check that no outrageous values given for interpolation
C
ISAME = INSANE()
IF ( ISAME .GT. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTF: Interpolation cannot use given values.',JPQUIET)
INTF = ISAME
GOTO 900
ENDIF
Cs setting of out Date
NODATE = NIDATE
C
C If output is same as the input, set return length to zero and
C do not copy input to output
C
IF( ISAME.EQ.-1 ) THEN
OUTLEN = 0
IRET = 0
CALL INTLOG(JP_DEBUG,
X 'INTF: Output is same as the input.',JPQUIET)
CALL INTLOG(JP_DEBUG,
X 'INTF: No interpolation carried out.',JPQUIET)
GOTO 900
ENDIF
C
C Set precipitation flag if user hasn't
C
IF( .NOT.LPRECSET ) LPREC = PRECIP()
C
C Handle packed fields
C
C
C -----------------------------------------------------------------|
C* Section 3. Use special interpolation for:
C - an ECMWF wave field.
C - a reduced latitude-longitude field
C -----------------------------------------------------------------|
C
300 CONTINUE
C
NUMTABL = NITABLE
NUMPROD = NUMTABL*1000 + NIPARAM
L98WAVE = (NUMTABL.EQ.140).OR.
X (NUMPROD.EQ.131229).OR.
X (NUMPROD.EQ.131232).OR.
X (NIREPR.EQ.26)
IF( L98WAVE ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTF: Wave-type interpolation required.',JPQUIET)
C
OUTLEN = IORIGLN
IF( NIFORM.EQ.1 ) THEN
IRET = INTWAVE2(INGRIB,INLEN,OUTGRIB,OUTLEN)
cs IRET = INTWAVE(INGRIB,INLEN,OUTGRIB,OUTLEN)
ELSE
IRET = INTWAVU(FLDIN,INLEN,FLDOUT,OUTLEN)
ENDIF
IF( IRET.EQ.0 ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTF: Wave-type interpolated OK.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'INTF: Wave-type interpolation failed.',JPQUIET)
ENDIF
INTF = IRET
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 4. Use special interpolation for an ECMWF ocean field.
C -----------------------------------------------------------------|
C
400 CONTINUE
C
IF( ((ISEC1(24).EQ.1).AND.(ISEC1(37).EQ.4)).OR.LOCEAN ) THEN
C
CALL INTLOG(JP_DEBUG,
X 'INTF: Ocean field interpolation required.',JPQUIET)
C
OUTLEN = IORIGLN
IF( NIFORM.EQ.1 ) THEN
IRET = OCEANP(INGRIB,INLEN,OUTGRIB,OUTLEN)
ELSE
IRET = OCEANU(FLDIN,INLEN,FLDOUT,OUTLEN)
ENDIF
IF( IRET.EQ.0 ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTF: Ocean field interpolated OK.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'INTF: Ocean field interpolation failed.',JPQUIET)
ENDIF
INTF = IRET
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 5. Continue interpolation setup in other cases.
C -----------------------------------------------------------------|
C
500 CONTINUE
IF( NIFORM.EQ.1 ) THEN
C
C Unpack (and rotate) field if necessary
C
IF( LUSEHIR ) THEN
IRET = HNTFAP(INGRIB,INLEN)
ELSE
IRET = INTFAP(INGRIB,INLEN)
ENDIF
C
C If a bitmap encountered with some missing values (IRET=-4),
C product cannot be interpolated unless 'missingvalue'
C specified via INTIN
C
IF( .NOT.LIMISSV ) THEN
IF( (IRET.NE.0).AND.(IRET.NE.-2) ) THEN
IF( IRET.EQ.-4 ) THEN
CALL INTLOG(JP_WARN,
X 'INTF: Product has bitmap and missing data.',JPQUIET)
CALL INTLOG(JP_WARN,
X 'INTF: Try Using INTIN "missingvalue" option',JPQUIET)
ENDIF
INTF = -4
GOTO 900
ENDIF
ELSE
IF( IRET.GT.0 ) THEN
CALL INTLOG(JP_WARN,
X 'INTF: Problems preparing for interpolation.',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
ENDIF
C
C Handle unpacked fields
C
ELSE
LUNROT = .TRUE.
IF( LUSEHIR ) THEN
IRET = HNTFAU(FLDIN,INLEN)
ELSE
IRET = INTFAU(FLDIN,INLEN)
ENDIF
ENDIF
C
IF( (IRET.NE.0).AND.(IRET.NE.-2) ) THEN
CALL INTLOG(JP_WARN,'INTF: Prepare interpolate fail',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
C
C Field values are now in ZNFELDI.
C
C Setup output length same as input GRIB length in case straight
C copy is done later (ie input is transferred direct to output
C without postprocessing).
C
OUTLEN = INLEN
C
C Setup interpolation options based on parameter in field.
C
IRET = PDDEFS()
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTF: Setup interpolation options from param failed',JPQUIET)
INTF = IRET
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 7. Interpolate input field.
C -----------------------------------------------------------------|
C
700 CONTINUE
C
C If all values missing, set flag to ensure all are missing in the
C interpolated field.
C
IF( ISEC4(1).LT.0 ) NOMISS = ISEC4(1)
C
C Perform the interpolation.
C
CALL INTLOG(JP_DEBUG,'INTF: Perform the interpolation.',JPQUIET)
C
OUTLEN = IORIGLN
IF( NIFORM.EQ.1 ) THEN
IRET = INTFB( INGRIB,INLEN,OUTGRIB,OUTLEN,FLDOUT)
ELSE
IRET = INTFB( ZNFELDI,INLEN,OUTGRIB,OUTLEN,FLDOUT)
ENDIF
C
IF( LUNROT.AND.LNOROTA ) THEN
OUTLEN = OUTLROT
ENDIF
C
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTF: Interpolation failed.',JPQUIET)
INTF = IRET
GOTO 900
ELSE
C
CALL INTLOG(JP_DEBUG,
X 'INTF: Interpolation finished successfully.',JPQUIET)
ENDIF
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
C Restore input and output area definitions
C
DO 910 LOOP = 1, 4
NIAREA(LOOP) = IIHOLD(LOOP)
NOAAPI(LOOP) = NOAREA(LOOP)
NOAREA(LOOP) = IOHOLD(LOOP)
910 CONTINUE
C
RETURN
END
|
