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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 RESET_C( KSEC1, KSEC2, PSEC2, KSEC4)
C
C---->
C*** RESET_C
C
C Purpose
C -------
C
C Reset interpolation common block variables according to the
C GRIB sections 1, 2 and 4 values.
C
C
C Interface
C ---------
C
C IRET = RESET_C( KSEC1, KSEC2, PSEC2, KSEC4)
C
C
C Input
C -----
C
C KSEC1 - GRIB section 1 array (integers).
C KSEC2 - GRIB section 2 array (integers).
C PSEC2 - GRIB section 2 array (reals).
C KSEC4 - GRIB section 4 array (integers).
C
C
C Externals
C ---------
C
C IGGLAT - Computes gaussian latitudes for a given truncation.
C
C
C Modifications
C -------------
C
C None.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF August, 1994
C
C----<
C
IMPLICIT NONE
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "current.h"
C
C Function arguments
C
INTEGER KSEC1, KSEC2, KSEC4
DIMENSION KSEC1(*), KSEC2(*), KSEC4(*)
REAL PSEC2
DIMENSION PSEC2(*)
C
C Local variables
C
INTEGER JJPR, JJERR, ITEMP
INTEGER I, IRET
LOGICAL LSAME, LPQUASI
C
C Externals
C
INTEGER IGGLAT
EXTERNAL IGGLAT
C
C-----------------------------------------------------------------------
C Section 1. Initialise
C-----------------------------------------------------------------------
C
100 CONTINUE
C
RESET_C = 0
C
LPQUASI = ( KSEC2(17).EQ.1 )
C
C Section 1, Word 1 - version number of WMO code table
C
IF( NITABLE.NE.KSEC1(1) ) LCHANGE = .TRUE.
NITABLE = KSEC1(1)
IF( .NOT.LNOTABL ) NOTABLE = NITABLE
C
C Section 1, Word 6 - parameter indicator (Code Table 2)
C
NIPARAM = KSEC1(6)
IF( .NOT.LNOPARA ) NOPARAM = NIPARAM
C
C Section 1, Word 7 - Type of level indicator (Code Table 3)
C
NILEVT = KSEC1(7)
IF( .NOT.LNOLEVT ) NOLEVT = NILEVT
C
C By default, upper air level does not use land-sea mask.
C (pressure level, sigma_level, model level, missing level)
C
IF( (NOLEVT.EQ.100) .OR.
X (NOLEVT.EQ.108) .OR.
X (NOLEVT.EQ.109) .OR.
X (NOLEVT.EQ.255) ) THEN
LSM = .FALSE.
LSMSET = .TRUE.
LSMCHNG = .FALSE.
ELSE
LSM = .TRUE.
LSMSET = .FALSE.
LSMCHNG = .TRUE.
ENDIF
C
C Section 1, Word 8 - Height or pressure of level (Code Table 3)
C
NILEVEL = KSEC1(8)
IF( .NOT.LNOLEVL ) NOLEVEL = NILEVEL
C
C Setup ECMWF local definition number and stream if applicable
C
IF( KSEC1(24).EQ.1 ) THEN
NILOCAL = KSEC1(37)
NISTREM = KSEC1(40)
ELSE
NILOCAL = 0
NISTREM = 0
ENDIF
C
C Section 2, Word 1 Data representation type (Code Table 6).
C
IF( NIREPR.NE.KSEC2(1) ) THEN
LCHANGE = .TRUE.
NIGAUSO = 0
HIGAUST = 'X'
IF( .NOT.LNOGAUS ) THEN
NOGAUSO = 0
HOGAUST = 'X'
ENDIF
ENDIF
NIREPR = KSEC2(1)
IF( .NOT.LNOREPR ) NOREPR = NIREPR
C
C Date of the input field (YYYYMMDD).
C
NIDATE = (KSEC1(21)-1)*1000000
X + KSEC1(10)*10000 + KSEC1(11)*100 + KSEC1(12)
NODATE = NIDATE
C
C Stretching factor (if any)
C
IF( (NIREPR.EQ.JPSTRGG).OR.(NIREPR.EQ.JPSTRSH) ) THEN
RISTRET = PSEC2(2)
IF( NIREPR.EQ.NOREPR ) THEN
IF( NIREPR.EQ.JPSTRGG ) NOREPR = JPGAUSSIAN
IF( NIREPR.EQ.JPSTRSH ) NOREPR = JPSPHERE
ENDIF
IF( NIREPR.EQ.JPSTRGG ) NIREPR = JPGAUSSIAN
IF( NIREPR.EQ.JPSTRSH ) NIREPR = JPSPHERE
ELSE
RISTRET = 0.0
ENDIF
C
C-----------------------------------------------------------------------
C Section 2. Latitude/longitude grid or equidistant cylindrical
C or Plate Carree.
C-----------------------------------------------------------------------
C
200 CONTINUE
C
IF ( (NIREPR.EQ.JPREGULAR).OR.(NIREPR.EQ.JPREGROT) ) THEN
C
C Check if quasi-regular lat/long
C
IF( LPQUASI ) NIREPR = JPREDLL
IF( .NOT.LNOREPR ) NOREPR = NIREPR
C
NIRESO = 0
NIGAUSS = 0
C
C Latitude/longitude grid or equidistant cylindrical
C or Plate Carree.
C
C Section 2, Word 2 Ni - Number of points along a parallel.
C Section 2, Word 3 Nj - Number of points along a meridian.
C
IF( NIREPR.EQ.JPREDLL ) THEN
NIWE = 0
ELSE
IF( NIWE.NE.KSEC2(2) ) LCHANGE = .TRUE.
NIWE = KSEC2(2)
ENDIF
C
IF( NINS.NE.KSEC2(3) ) LCHANGE = .TRUE.
NINS = KSEC2(3)
C
C Section 2, Word 4 La1 - Latitude of first grid point.
C Section 2, Word 5 Lo1 - Longitude of first grid point.
C
IF( NIAREA(1).NE.(KSEC2(4)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(1) = KSEC2(4) * JPMICRO
IF( NIAREA(2).NE.(KSEC2(5)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(2) = KSEC2(5) * JPMICRO
C
C Section 2, Word 7 La2 - Latitude of last grid point.
C Section 2, Word 8 Lo2 - Longitude of last grid point.
C
IF( NIAREA(3).NE.(KSEC2(7)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(3) = KSEC2(7) * JPMICRO
IF( NIAREA(4).NE.(KSEC2(8)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(4) = KSEC2(8) * JPMICRO
C
C Section 2, Word 9 Di - i direction increment.
C Section 2, Word 10 Dj - j direction increment.
C
IF( NIREPR.EQ.JPREDLL ) THEN
NIGRID(1) = 0
ELSE
IF( NIGRID(1).NE.(KSEC2(9)*JPMICRO) ) LCHANGE = .TRUE.
NIGRID(1) = KSEC2(09) * JPMICRO
ENDIF
C
IF( NIGRID(2).NE.(KSEC2(10)*JPMICRO) ) LCHANGE = .TRUE.
NIGRID(2) = KSEC2(10) * JPMICRO
C
C Section 2, Word 11 Scanning mode flags (Code Table 8).
C
IF( NISCNM.NE.KSEC2(11) ) LCHANGE = .TRUE.
NISCNM = KSEC2(11)
C
C Pick up regular gaussian grid definition if option 'gaussian'
C used.
C
IF( NOREPR.EQ.JPNOTYPE ) THEN
IF( (NOGAUSO.NE.NOGAUSS).OR.(HOGAUST.NE.'F') ) THEN
CALL JGETGG( NOGAUSS, 'F', ROGAUSS, NOLPTS, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NOGAUSS = ',NOGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NOGAUSO = NOGAUSS
HOGAUST = 'F'
ENDIF
NOREPR = JPGAUSSIAN
ENDIF
C
C If reduced lat/long output and no user specified grid, use
C input reduced lat/long definition for number of points at
C each latitude
C
IF( LPQUASI .AND. (.NOT.LNOREPR ) ) THEN
NOREDLL = KSEC2(3)
NONS = NINS
DO 210 I = 1, NINS
MILLEN(I) = KSEC2(22 + I)
210 CONTINUE
DO 220 I = 1, NONS
NOLPTS(I) = MILLEN(I)
220 CONTINUE
ENDIF
C
C If reduced lat/long input, read input reduced lat/long definition
C for number of points at each latitude and set east longitude,
C unless it is a subarea (eg Mediterranean).
C
IF( NIREPR.EQ.JPREDLL ) THEN
DO I = 1, NINS
MILLEN(I) = KSEC2(22 + I)
ENDDO
C
C Calculate east longitude if field is global.
C Use southern latitude to guess if it is ...
C
IF( NIAREA(3).LT.0 ) THEN
ITEMP = 36000000 - 36000000/MILLEN(NINS/2)
IF( NIAREA(4).NE.ITEMP ) LCHANGE = .TRUE.
NIAREA(4) = 36000000 - 36000000/MILLEN(NINS/2)
ENDIF
ENDIF
C
ENDIF
C
C-----------------------------------------------------------------------
C Section 3. Spherical Harmonic Coefficients.
C-----------------------------------------------------------------------
C
300 CONTINUE
C
IF( (NIREPR.EQ.JPSPHERE).OR.
X (NIREPR.EQ.JPSTRSH).OR.
X (NIREPR.EQ.JPSPHROT) ) THEN
C
NIGAUSS = 0
NIGRID(1) = 0
NIGRID(2) = 0
C
C Section 2, Word 2 J - Pentagonal resolution parameter.
C
IF( NIRESO.NE.KSEC2(2) ) LCHANGE = .TRUE.
NIRESO = KSEC2(2)
IF( .NOT.LNORESO ) THEN
IF( NORESO.NE.NIRESO ) LCHANGE = .TRUE.
NORESO = NIRESO
ENDIF
C
C Pick up regular gaussian grid definition if option 'gaussian'
C used.
C
IF( NOREPR.EQ.JPNOTYPE ) THEN
IF( (NOGAUSO.NE.NOGAUSS).OR.(HOGAUST.NE.'F') ) THEN
CALL JGETGG( NOGAUSS, 'F', ROGAUSS, NOLPTS, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NOGAUSS = ',NOGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NOGAUSO = NOGAUSS
HOGAUST = 'F'
ENDIF
NOREPR = JPGAUSSIAN
ENDIF
C
ENDIF
C
C-----------------------------------------------------------------------
C Section 4. Regular gaussian grid.
C-----------------------------------------------------------------------
C
400 CONTINUE
C
IF( (NIREPR.EQ.JPGAUSSIAN) .AND. (.NOT.LPQUASI) ) THEN
C
NIRESO = 0
NIGRID(1) = 0
NIGRID(2) = 0
C
C Section 2, Word 2 Ni - Number of points along a parallel.
C Section 2, Word 3 Nj - Number of points along a meridian.
C
IF( NIWE.NE.KSEC2(2) ) LCHANGE = .TRUE.
NIWE = KSEC2(2)
IF( NINS.NE.KSEC2(3) ) LCHANGE = .TRUE.
NINS = KSEC2(3)
C
C Section 2, Word 4 La1 - Latitude of first grid point.
C Section 2, Word 5 Lo1 - Longitude of first grid point.
C
IF( NIAREA(1).NE.(KSEC2(4)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(1) = KSEC2(4) * JPMICRO
IF( NIAREA(2).NE.(KSEC2(5)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(2) = KSEC2(5) * JPMICRO
C
C Section 2, Word 7 La2 - Latitude of last grid point.
C Section 2, Word 8 Lo2 - Longitude of last grid point.
C
IF( NIAREA(3).NE.(KSEC2(7)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(3) = KSEC2(7) * JPMICRO
IF( NIAREA(4).NE.(KSEC2(8)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(4) = KSEC2(8) * JPMICRO
C
C Section 2, Word 10 N - Number of parallels between Pole and
C the Equator.
C
IF( NIGAUSS.NE.KSEC2(10) ) LCHANGE = .TRUE.
NIGAUSS = KSEC2(10)
C
C Pick up gaussian definitions for input grid
C
IF( (NIGAUSO.NE.NIGAUSS).OR.(HIGAUST.NE.'F') ) THEN
CALL JGETGG( NIGAUSS, 'F', RIGAUSS, MILLEN, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NIGAUSS = ',NIGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NIGAUSO = NIGAUSS
HIGAUST = 'F'
ENDIF
C
C Use same gaussian number for output unless user has
C deliberately set a value
C
IF( .NOT.LNOGAUS ) THEN
IF( NOGAUSS.NE.NIGAUSS ) LCHANGE = .TRUE.
NOGAUSS = NIGAUSS
ENDIF
C
C Fixup output type if 'gaussian' used to describe output and
C not 'reduced' or 'regular'.
C
LSAME = (NOREPR.EQ.JPNOTYPE) .AND. (NOGAUSS.EQ.NIGAUSS)
C
C Pick up regular gaussian grid definition corresponding
C to the input field if option 'gaussian' used.
C
IF( (NOREPR.EQ.JPNOTYPE).AND.(.NOT.LSAME) ) THEN
IF( (NOGAUSO.NE.NOGAUSS).OR.(HOGAUST.NE.'F') ) THEN
CALL JGETGG( NOGAUSS, 'F', ROGAUSS, NOLPTS, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NOGAUSS = ',NOGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NOGAUSO = NOGAUSS
HOGAUST = 'F'
ENDIF
NOREPR = JPGAUSSIAN
ENDIF
C
C Section 2, Word 11 Scanning mode flags (Code Table 8).
C
IF( NISCNM.NE.KSEC2(11) ) LCHANGE = .TRUE.
NISCNM = KSEC2(11)
C
ENDIF
C
C-----------------------------------------------------------------------
C Section 5. Quasi-regular (reduced) gaussian grid.
C-----------------------------------------------------------------------
C
500 CONTINUE
C
IF( (NIREPR.EQ.JPGAUSSIAN) .AND. LPQUASI ) THEN
C
NIRESO = 0
NIGRID(1) = 0
NIGRID(2) = 0
C
C Set representation(s) to "quasi-regular gaussian"
C
NIREPR = JPQUASI
IF( .NOT.LNOREPR ) NOREPR = NIREPR
C
C Section 2, Word 2 Ni - Number of points along a parallel.
C Cannot be used for quasi-regular grids.
C Section 2, Word 3 Nj - Number of points along a meridian.
C
IF( NIWE.NE.0 ) LCHANGE = .TRUE.
NIWE = 0
IF( NINS.NE.KSEC2(3) ) LCHANGE = .TRUE.
NINS = KSEC2(3)
C
C Section 2, Word 4 La1 - Latitude of first grid point.
C Section 2, Word 5 Lo1 - Longitude of first grid point.
C
IF( NIAREA(1).NE.(KSEC2(4)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(1) = KSEC2(4) * JPMICRO
IF( NIAREA(2).NE.(KSEC2(5)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(2) = KSEC2(5) * JPMICRO
C
C Section 2, Word 7 La2 - Latitude of last grid point.
C Section 2, Word 8 Lo2 - Longitude of last grid point.
C
IF( NIAREA(3).NE.(KSEC2(7)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(3) = KSEC2(7) * JPMICRO
IF( NIAREA(4).NE.(KSEC2(8)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(4) = KSEC2(8) * JPMICRO
C
C Section 2, Word 10 N - Number of parallels between Pole and
C the Equator.
C
IF( NIGAUSS.NE.KSEC2(10) ) THEN
LCHANGE = .TRUE.
JJPR = 1
JJERR = 1
IRET = IGGLAT( KSEC2(10)*2, RIGAUSS , JJPR, JJERR)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR, 'RESET_C: IGGLAT failed',JPQUIET)
RESET_C = IRET
GOTO 900
ENDIF
ENDIF
NIGAUSS = KSEC2(10)
C
C Fixup output type if 'gaussian' used to describe output and
C not 'reduced' or 'regular'.
C
LSAME = (NOREPR.EQ.JPNOTYPE) .AND. (NOGAUSS.EQ.NIGAUSS)
C
C Pick up regular gaussian grid definition corresponding
C to the output field if option 'gaussian' used.
C
IF( (NOREPR.EQ.JPNOTYPE).AND.(.NOT.LSAME) ) THEN
IF( (NOGAUSO.NE.NOGAUSS).OR.(HOGAUST.NE.'F') ) THEN
CALL JGETGG( NOGAUSS, 'F', ROGAUSS, NOLPTS, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NOGAUSS = ',NOGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NOGAUSO = NOGAUSS
HOGAUST = 'F'
ENDIF
NOREPR = JPGAUSSIAN
ENDIF
C
C Section 2, Word 11 Scanning mode flags (Code Table 8).
C
IF ( NISCNM .NE. KSEC2(11) ) LCHANGE = .TRUE.
NISCNM = KSEC2(11)
C
C Section 2, Word 23-nn
C Number of points along each parallel in a quasi-regular grid.
C Number of parallels is given by Nj above.
C
C Pick up gaussian definitions for input grid
C
IF( (NIGAUSO.NE.NIGAUSS).OR.(HIGAUST.NE.'F') ) THEN
CALL JGETGG( NIGAUSS, 'F', RIGAUSS, MILLEN, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'RESET_C: JGETGG failed, NIGAUSS = ',NIGAUSS)
RESET_C = IRET
GOTO 900
ENDIF
NIGAUSO = NIGAUSS
HIGAUST = 'F'
ENDIF
DO 510 I = 1, NINS
MILLEN(I) = KSEC2(22 + I)
510 CONTINUE
C
C Use same grid for output, unless user requested otherwise.
C
IF( (.NOT.LNOGAUS) .OR. LSAME ) THEN
IF( NOGAUSS.NE.NIGAUSS ) LCHANGE = .TRUE.
NOGAUSS = NIGAUSS
NONS = NINS
DO 520 I = 1, NONS
NOLPTS(I) = MILLEN(I)
ROGAUSS(I) = RIGAUSS(I)
520 CONTINUE
NOGAUSO = NIGAUSO
HOGAUST = HIGAUST
ENDIF
C
ENDIF
C
C-----------------------------------------------------------------------
C Section 6. Polar Stereographic grid.
C-----------------------------------------------------------------------
C
600 CONTINUE
C
IF ( NIREPR .EQ. 5 ) THEN
C
NIRESO = 0
NIGAUSS = 0
C
C Section 2, Word 2 Nx - Number of points along X-axis.
C Section 2, Word 3 Ny - Number of points along Y-axis.
C
IF( NIWE.NE.0 ) LCHANGE = .TRUE.
NIWE = KSEC2(2)
IF( NINS.NE.KSEC2(3) ) LCHANGE = .TRUE.
NINS = KSEC2(3)
C
C Section 2, Word 4 La1 - Latitude of first grid point.
C Section 2, Word 5 Lo1 - Longitude of first grid point.
C
IF( NIAREA(1).NE.(KSEC2(4)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(1) = KSEC2(4) * JPMICRO
IF( NIAREA(2).NE.(KSEC2(5)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(2) = KSEC2(5) * JPMICRO
C
C Section 2, Word 7 La2 - Latitude of last grid point.
C Section 2, Word 8 Lo2 - Longitude of last grid point.
C
IF( NIAREA(3).NE.(KSEC2(7)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(3) = KSEC2(7) * JPMICRO
IF( NIAREA(4).NE.(KSEC2(8)*JPMICRO) ) LCHANGE = .TRUE.
NIAREA(4) = KSEC2(8) * JPMICRO
C
C Section 2, Word 9 Dx - X-direction increment.
C Section 2, Word 10 Dy - Y-direction increment.
C
IF( NIGRID(1).NE.KSEC2(9) ) LCHANGE = .TRUE.
NIGRID(1) = KSEC2(09)
IF( NIGRID(2).NE.KSEC2(10) ) LCHANGE = .TRUE.
NIGRID(2) = KSEC2(10)
C
C Section 2, Word 11 Scanning mode flags (Code Table 8).
C
IF( NISCNM.NE.KSEC2(11) ) LCHANGE = .TRUE.
NISCNM = KSEC2(11)
C
ENDIF
C
C-----------------------------------------------------------------------
C Section 7. Setup number of bits used for packing ouput.
C-----------------------------------------------------------------------
C
700 CONTINUE
C
C Section 4, Word 2 - Number of bits used for each packed value.
C
C Use same number of bits for packing output values for unless
C user has deliberately set a value.
C
NIACC = KSEC4(2)
IF( .NOT.LNOACC ) THEN
IF( NOACC.NE.NIACC ) LCHANGE = .TRUE.
NOACC = NIACC
ENDIF
C
C If default is implied for the output grid, use the input grid
C
IF( ( (NIREPR.EQ.JPREGULAR).OR.
X (NIREPR.EQ.JPREDLL) .OR.
X (NIREPR.EQ.JPREGROT) ) .AND.
X ( (NOREPR.EQ.JPREGULAR).OR.
X (NOREPR.EQ.JPREDLL) .OR.
X (NOREPR.EQ.JPREGROT) ) .AND.
X .NOT.LNOGRID ) THEN
NOGRID(1) = NIGRID(1)
NOGRID(2) = NIGRID(2)
ENDIF
C
C-----------------------------------------------------------------------
C Section 9. Closedown.
C-----------------------------------------------------------------------
C
900 CONTINUE
RETURN
END
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